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  • javaweb选课系统 JAVAWEB选课系统
    2021-04-22 11:14:11

    按照网上的教程和素材制作，第一部分信息管理

    1c0cf8992cfe358ed07cab20c190e521.png

    6f23c7596e525d84e26632853e40acde.png

    源码

    ackage com.ischoolbar.programmer.dao;

    import java.sql.ResultSet;

    import java.sql.SQLException;

    import com.ischoolbar.programmer.model.Admin;

    import com.ischoolbar.programmer.model.Clazz;

    /**

    *

    * @author llq

    *管理员数据库操作封装

    */

    public class AdminDao extends BaseDao {

    public Admin login(String name ,String password){

    String sql = "select * from s_admin where name = '" + name + "' and password = '" + password + "'";

    ResultSet resultSet = query(sql);

    try {

    if(resultSet.next()){

    Admin admin = new Admin();

    admin.setId(resultSet.getInt("id"));

    admin.setName(resultSet.getString("name"));

    admin.setPassword(resultSet.getString("password"));

    admin.setStatus(resultSet.getInt("status"));

    return admin;

    }

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    return null;

    }

    public boolean editPassword(Admin admin,String newPassword) {

    // TODO Auto-generated method stub

    String sql = "update s_admin set password = '"+newPassword+"' where id = " + admin.getId();

    return update(sql);

    }

    }

    package com.ischoolbar.programmer.dao;

    import java.sql.Connection;

    import java.sql.PreparedStatement;

    import java.sql.ResultSet;

    import java.sql.SQLException;

    import java.util.ArrayList;

    import java.util.List;

    import com.ischoolbar.programmer.util.DbUtil;

    /**

    *

    * @author llq

    *基础dao，封装基本操作

    */

    public class BaseDao {

    private DbUtil dbUtil = new DbUtil();

    /**

    * 关闭数据库连接，释放资源

    */

    public void closeCon(){

    dbUtil.closeCon();

    }

    /**

    * 基础查询,多条查询

    */

    public ResultSet query(String sql){

    try {

    PreparedStatement prepareStatement = dbUtil.getConnection().prepareStatement(sql);

    return prepareStatement.executeQuery();

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    return null;

    }

    /**

    *改变数据库内容操作

    */

    public boolean update(String sql){

    try {

    return dbUtil.getConnection().prepareStatement(sql).executeUpdate() > 0;

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    return false;

    }

    public Connection getConnection(){

    return dbUtil.getConnection();

    }

    }

    package com.ischoolbar.programmer.dao;

    import java.sql.Connection;

    import java.sql.PreparedStatement;

    import java.sql.ResultSet;

    import java.sql.SQLException;

    import java.util.ArrayList;

    import java.util.List;

    import com.ischoolbar.programmer.model.Admin;

    import com.ischoolbar.programmer.model.Clazz;

    import com.ischoolbar.programmer.model.Page;

    import com.ischoolbar.programmer.model.Student;

    import com.ischoolbar.programmer.util.StringUtil;

    public class StudentDao extends BaseDao {

    public boolean addStudent(Student student){

    String sql = "insert into s_student values(null,'"+student.getSn()+"','"+student.getName()+"'";

    sql += ",'" + student.getPassword() + "'," + student.getClazzId();

    sql += ",'" + student.getSex() + "','" + student.getMobile() + "'";

    sql += ",'" + student.getQq() + "',null)";

    return update(sql);

    }

    public boolean editStudent(Student student) {

    // TODO Auto-generated method stub

    String sql = "update s_student set name = '"+student.getName()+"'";

    sql += ",sex = '" + student.getSex() + "'";

    sql += ",mobile = '" + student.getMobile() + "'";

    sql += ",qq = '" + student.getQq() + "'";

    sql += ",clazz_id = " + student.getClazzId();

    sql += " where id = " + student.getId();

    return update(sql);

    }

    public boolean setStudentPhoto(Student student) {

    // TODO Auto-generated method stub

    String sql = "update s_student set photo = ? where id = ?";

    Connection connection = getConnection();

    try {

    PreparedStatement prepareStatement = connection.prepareStatement(sql);

    prepareStatement.setBinaryStream(1, student.getPhoto());

    prepareStatement.setInt(2, student.getId());

    return prepareStatement.executeUpdate() > 0;

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    return update(sql);

    }

    public boolean deleteStudent(String ids) {

    // TODO Auto-generated method stub

    String sql = "delete from s_student where id in("+ids+")";

    return update(sql);

    }

    public Student getStudent(int id){

    String sql = "select * from s_student where id = " + id;

    Student student = null;

    ResultSet resultSet = query(sql);

    try {

    if(resultSet.next()){

    student = new Student();

    student.setId(resultSet.getInt("id"));

    student.setClazzId(resultSet.getInt("clazz_id"));

    student.setMobile(resultSet.getString("mobile"));

    student.setName(resultSet.getString("name"));

    student.setPassword(resultSet.getString("password"));

    student.setPhoto(resultSet.getBinaryStream("photo"));

    student.setQq(resultSet.getString("qq"));

    student.setSex(resultSet.getString("sex"));

    student.setSn(resultSet.getString("sn"));

    return student;

    }

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    return student;

    }

    public List getStudentList(Student student,Page page){

    List ret = new ArrayList();

    String sql = "select * from s_student ";

    if(!StringUtil.isEmpty(student.getName())){

    sql += "and name like '%" + student.getName() + "%'";

    }

    if(student.getClazzId() != 0){

    sql += " and clazz_id = " + student.getClazzId();

    }

    if(student.getId() != 0){

    sql += " and id = " + student.getId();

    }

    sql += " limit " + page.getStart() + "," + page.getPageSize();

    ResultSet resultSet = query(sql.replaceFirst("and", "where"));

    try {

    while(resultSet.next()){

    Student s = new Student();

    s.setId(resultSet.getInt("id"));

    s.setClazzId(resultSet.getInt("clazz_id"));

    s.setMobile(resultSet.getString("mobile"));

    s.setName(resultSet.getString("name"));

    s.setPassword(resultSet.getString("password"));

    s.setPhoto(resultSet.getBinaryStream("photo"));

    s.setQq(resultSet.getString("qq"));

    s.setSex(resultSet.getString("sex"));

    s.setSn(resultSet.getString("sn"));

    ret.add(s);

    }

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    return ret;

    }

    public int getStudentListTotal(Student student){

    int total = 0;

    String sql = "select count(*)as total from s_student ";

    if(!StringUtil.isEmpty(student.getName())){

    sql += "and name like '%" + student.getName() + "%'";

    }

    if(student.getClazzId() != 0){

    sql += " and clazz_id = " + student.getClazzId();

    }

    if(student.getId() != 0){

    sql += " and id = " + student.getId();

    }

    ResultSet resultSet = query(sql.replaceFirst("and", "where"));

    try {

    while(resultSet.next()){

    total = resultSet.getInt("total");

    }

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    return total;

    }

    package com.ischoolbar.programmer.util;

    import java.sql.Connection;

    import java.sql.Driver;

    import java.sql.DriverManager;

    import java.sql.SQLException;

    import javax.management.loading.PrivateClassLoader;

    /**

    *

    * @author llq

    *数据库连util

    */

    public class DbUtil {

    private String dbUrl = "jdbc:mysql://localhost:3306/db_student_manager_web?useUnicode=true&characterEncoding=utf8";

    private String dbUser = "root";

    private String dbPassword = "";

    private String jdbcName = "com.mysql.jdbc.Driver";

    private Connection connection = null;

    public Connection getConnection(){

    try {

    Class.forName(jdbcName);

    connection = DriverManager.getConnection(dbUrl, dbUser, dbPassword);

    System.out.println("数据库链接成功！");

    } catch (Exception e) {

    // TODO Auto-generated catch block

    System.out.println("数据库链接失败！");

    e.printStackTrace();

    }

    return connection;

    }

    public void closeCon(){

    if(connection != null)

    try {

    connection.close();

    System.out.println("数据库链接已关闭！");

    } catch (SQLException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }

    }

    public static void main(String[] args) {

    // TODO Auto-generated method stub

    DbUtil dbUtil = new DbUtil();

    dbUtil.getConnection();

    }

    }

    标签：JAVAWEB,选课,系统,resultSet,student,sql,import,public,String

    来源： https://www.cnblogs.com/ICDTAD/p/12152648.html

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     2021-03-05 20:55:53
    该系统管理员可以添加和删除学生、教师，教师可以修改自己信息、添加课程、浏览自己课程，学生可以修改自己的信息、选课、浏览全部课程。首先展示文件：然后就是一次展示代码：Guanli包中代码：package Guanli;...

    该系统管理员可以添加和删除学生、教师，教师可以修改自己信息、添加课程、浏览自己课程，学生可以修改自己的信息、选课、浏览全部课程。

    首先展示文件：

    d83204266a1e84646ee3a5f71a3cfc15.png

    d1c0233b78e4348a6c40389ef903b28b.png

    a8bf7530eef63499770b436ef7dda29d.png

    然后就是一次展示代码：

    Guanli包中代码：

    package Guanli;

    import java.sql.Connection;

    import java.sql.SQLException;

    import java.sql.Statement;

    import Login.DBUtil;public classAdd {publicboolean add(String table,AddService en)

    {

    boolean c=false;

    String sql="insert into"+table+"(username,password,power,name) values('"+en.getUsername()+"','"+en.getPassword()+"','"+en.getPower()+"','"+en.getName()+"');";

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();int num=state.executeUpdate(sql);if(num!=0)

    c=true;

    state.close();

    conn.close();

    }catch(SQLException e) {//TODO Auto-generated catch block//e.printStackTrace();

    }returnc;

    }publicboolean add(String table,TeacherService en)

    {

    boolean c=false;

    String sql="insert into"+table+"(gonghao,xingming,xingbie,xueyuan,zhicheng) values('"+en.getGonghao()+"','"+en.getXingming()+"','"+en.getXingbie()+"','"+en.getXueyuan()+"','"+en.getZhicheng()+"');";

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();int num=state.executeUpdate(sql);if(num!=0)

    c=true;

    state.close();

    conn.close();

    }catch(SQLException e) {//TODO Auto-generated catch block//e.printStackTrace();

    }returnc;

    }publicboolean add(String table,StudentService en)

    {

    boolean c=false;

    String sql="insert into"+table+"(xuehao,xingming,xingbie,banji,zhuanye) values('"+en.getXuehao()+"','"+en.getXingming()+"','"+en.getXingbie()+"','"+en.getBanji()+"','"+en.getZhuanye()+"');";

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();int num=state.executeUpdate(sql);if(num!=0)

    c=true;

    state.close();

    conn.close();

    }catch(SQLException e) {//TODO Auto-generated catch block//e.printStackTrace();

    }returnc;

    }

    }

    package Guanli;

    import java.sql.Time;

    import java.text.SimpleDateFormat;

    import java.util.Date;public classAddService {

    String username;

    String password;

    String name;publicString getName() {returnname;

    }public voidsetName(String name) {this.name =name;

    }intpower;publicString getUsername() {returnusername;

    }public voidsetUsername(String username) {this.username =username;

    }publicString getPassword() {returnpassword;

    }public voidsetPassword(String password) {this.password =password;

    }public intgetPower() {returnpower;

    }public void setPower(intpower) {this.power =power;

    }

    }

    packageGuanli;importjava.awt.Desktop.Action;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importLogin.Power;importLogin.Select;/*** Servlet implementation class RegisterServlet*/@WebServlet("/RegisterServlet")public class RegisterServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicRegisterServlet() {super();//TODO Auto-generated constructor stub

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    Select s=newSelect();

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("teacher"))

    {

    AddService as=newAddService();

    Add a=newAdd();

    String username;

    username=arg0.getParameter("username");

    as.setUsername(username);

    String password;

    password=arg0.getParameter("password");

    as.setPassword(password);int num=1;

    as.setPower(num);

    TeacherService ts=newTeacherService();

    String gonghao;

    gonghao=arg0.getParameter("gonghao");

    ts.setGonghao(gonghao);

    String xingming;

    xingming=arg0.getParameter("xingming");

    ts.setXingming(xingming);

    as.setName(xingming);

    String xingbie;

    xingbie=arg0.getParameter("xingbie");

    ts.setXingbie(xingbie);

    String xueyuan;

    xueyuan=arg0.getParameter("xueyuan");

    ts.setXueyuan(xueyuan);

    String zhicheng;

    zhicheng=arg0.getParameter("zhicheng");

    ts.setZhicheng(zhicheng);

    a.add("login", as);

    a.add("teacher", ts);

    arg0.setAttribute("message","添加成功");

    arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);

    }if(function.equals("student"))

    {

    AddService as=newAddService();

    Add a=newAdd();

    String username;

    username=arg0.getParameter("username");

    as.setUsername(username);

    String password;

    password=arg0.getParameter("password");

    as.setPassword(password);int num=2;

    as.setPower(num);

    StudentService ss=newStudentService();

    String xuehao;

    xuehao=arg0.getParameter("xuehao");

    ss.setXuehao(xuehao);

    String xingming;

    xingming=arg0.getParameter("xingming");

    ss.setXingming(xingming);

    as.setName(xingming);

    String xingbie;

    xingbie=arg0.getParameter("xingbie");

    ss.setXingbie(xingbie);

    String banji;

    banji=arg0.getParameter("banji");

    ss.setBanji(banji);

    String zhuanye;

    zhuanye=arg0.getParameter("zhuanye");

    ss.setZhuanye(zhuanye);

    a.add("student", ss);

    a.add("login", as);

    arg0.setAttribute("message","添加成功");

    arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);

    }

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    packageGuanli;public classStudentService {

    String xuehao;

    String xingming;

    String xingbie;

    String banji;

    String zhuanye;publicString getXuehao() {returnxuehao;

    }public voidsetXuehao(String xuehao) {this.xuehao =xuehao;

    }publicString getXingming() {returnxingming;

    }public voidsetXingming(String xingming) {this.xingming =xingming;

    }publicString getXingbie() {returnxingbie;

    }public voidsetXingbie(String xingbie) {this.xingbie =xingbie;

    }publicString getBanji() {returnbanji;

    }public voidsetBanji(String banji) {this.banji =banji;

    }publicString getZhuanye() {returnzhuanye;

    }public voidsetZhuanye(String zhuanye) {this.zhuanye =zhuanye;

    }

    }

    packageGuanli;public classTeacherService {

    String gonghao;

    String xingming;

    String xingbie;

    String xueyuan;

    String zhicheng;publicString getGonghao() {returngonghao;

    }public voidsetGonghao(String gonghao) {this.gonghao =gonghao;

    }publicString getXingming() {returnxingming;

    }public voidsetXingming(String xingming) {this.xingming =xingming;

    }publicString getXingbie() {returnxingbie;

    }public voidsetXingbie(String xingbie) {this.xingbie =xingbie;

    }publicString getXueyuan() {returnxueyuan;

    }public voidsetXueyuan(String xueyuan) {this.xueyuan =xueyuan;

    }publicString getZhicheng() {returnzhicheng;

    }public voidsetZhicheng(String zhicheng) {this.zhicheng =zhicheng;

    }

    }

    Login包里的文件：

    packageLogin;importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.PreparedStatement;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;/*** 数据库连接工具

    *@authorHu

    **/

    public classDBUtil {public static String db_url = "jdbc:mysql://localhost:3306/jianmintest?useSSL=false&serverTimezone=UTC&characterEncoding=UTF-8";public static String db_user = "root";public static String db_pass = "20183629";public staticConnection getConn () {

    Connection conn= null;try{

    Class.forName("com.mysql.jdbc.Driver");//加载驱动

    conn =DriverManager.getConnection(db_url, db_user, db_pass);

    }catch(Exception e) {

    e.printStackTrace();

    }returnconn;

    }/*** 关闭连接

    *@paramstate

    *@paramconn*/

    public static voidclose (Statement state, Connection conn) {if (state != null) {try{

    state.close();

    }catch(SQLException e) {

    e.printStackTrace();

    }

    }if (conn != null) {try{

    conn.close();

    }catch(SQLException e) {

    e.printStackTrace();

    }

    }

    }public static voidclose (ResultSet rs, Statement state, Connection conn) {if (rs != null) {try{

    rs.close();

    }catch(SQLException e) {

    e.printStackTrace();

    }

    }if (state != null) {try{

    state.close();

    }catch(SQLException e) {

    e.printStackTrace();

    }

    }if (conn != null) {try{

    conn.close();

    }catch(SQLException e) {

    e.printStackTrace();

    }

    }

    }public static void main(String[] args) throwsSQLException {

    Connection conn=getConn();

    PreparedStatement pstmt= null;

    ResultSet rs= null;

    String sql="select * from course";

    pstmt=conn.prepareStatement(sql);

    rs=pstmt.executeQuery();if(rs.next()){

    System.out.println("空");

    }else{

    System.out.println("不空");

    }

    }

    }

    packageLogin;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;/*** Servlet implementation class LoginServlet*/@WebServlet("/LoginServlet")public class LoginServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicLoginServlet() {super();//TODO Auto-generated constructor stub

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    Select s=newSelect();

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("login"))

    {

    String username;

    username=arg0.getParameter("username");

    String password;

    password=arg0.getParameter("password");

    String power;

    power=arg0.getParameter("power");int num=Integer.parseInt(power);

    flag=s.select("login", username, password,num);

    Power.setFlag(num);if(flag)

    {

    arg0.setAttribute("message","登录成功");

    arg0.getRequestDispatcher("Home.jsp").forward(arg0, arg1);

    }else{

    arg0.setAttribute("message", "账号或密码有误");

    arg0.getRequestDispatcher("Login.jsp").forward(arg0, arg1);

    }

    }

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    packageLogin;public classPower {static intflag;public static intgetFlag() {returnflag;

    }public static void setFlag(intflag) {

    Power.flag=flag;

    }staticString xingming;public staticString getXingming() {returnxingming;

    }public static voidsetXingming(String xingming) {

    Power.xingming=xingming;

    }staticString username;public staticString getUsername() {returnusername;

    }public static voidsetUsername(String username) {

    Power.username=username;

    }

    }

    packageLogin;importjava.sql.Connection;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;public classSelect {public boolean select(String table,String username,String password,intnum)

    {boolean f=false;

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="select * from "+table;

    ResultSet rs=state.executeQuery(sql);while(rs.next())

    {if(username.equals(rs.getString(1))&&password.equals(rs.getString(2))&&rs.getInt(4)==num)

    {

    Power.setXingming(rs.getString(3));

    Power.setUsername(rs.getString(1));

    System.out.println(Power.getXingming());

    f=true;

    }

    }

    rs.close();

    state.close();

    conn.close();

    }catch(Exception e)

    {

    }returnf;

    }

    }

    Student包中的代码：

    packageStudent;importjava.sql.Connection;importjava.sql.SQLException;importjava.sql.Statement;importLogin.DBUtil;public classAdd {public booleanadd(String table,Jieguo en)

    {boolean c=false;

    String sql="insert into "+table+"(kechengbianhao,gonghao,jiaoshixingming,xuehao,xingming) values('"+en.getKechengbianhao()+"','"+en.getGonghao()+"','"+en.getJiaoshixingming()+"','"+en.getXuehao()+"','"+en.getXingming()+"');";

    System.out.println(sql);

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();int num=state.executeUpdate(sql);if(num!=0)

    c=true;

    state.close();

    conn.close();

    }catch(SQLException e) {//TODO Auto-generated catch block//e.printStackTrace();

    }returnc;

    }

    }

    packageStudent;importjava.sql.Connection;importjava.sql.SQLException;importjava.sql.Statement;importLogin.DBUtil;public classChange {public booleanchange(String table,String lie,String lie0,String gai,String biao)

    {

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="update "+table+" set "+lie+"='"+gai+"' where "+lie0+"='"+biao+"'";

    System.out.println(sql);

    state.executeUpdate(sql);

    state.close();

    conn.close();

    }catch(SQLException e) {//TODO Auto-generated catch block

    e.printStackTrace();

    }return true;

    }

    }

    packageStudent;importjava.sql.Connection;importjava.sql.ResultSet;importjava.sql.Statement;importLogin.DBUtil;public classFind {public booleanfind(String table,String id)

    {booleanc;

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="select * from "+table+" where xingming ='"+id+"'";

    ResultSet rs=state.executeQuery(sql);while(rs.next())

    {

    Service.setXuehao(rs.getString(1));

    Service.setXingming(rs.getString(2));

    Service.setXingbie(rs.getString(3));

    Service.setBanji(rs.getString(4));

    Service.setZhuanye(rs.getString(5));

    }

    rs.close();

    state.close();

    conn.close();

    System.out.println("over");

    }catch(Exception e)

    {

    }return true;

    }public voidfindclass(String table,String id)

    {booleanc;

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="select * from "+table+" where kechengbianhao ='"+id+"'";

    ResultSet rs=state.executeQuery(sql);while(rs.next())

    {

    KechengService.setKechengbianhao(rs.getString(1));

    KechengService.setKechengmingcheng(rs.getString(2));

    KechengService.setRenkejiaoshi(rs.getString(4));

    KechengService.setRenshushangxian(rs.getInt(5));

    KechengService.setXianyourenshu(rs.getInt(6));

    }

    rs.close();

    state.close();

    conn.close();

    System.out.println("over");

    }catch(Exception e)

    {

    }

    }public voidfindjiaoshi(String table,String id)

    {booleanc;

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="select * from "+table+" where gonghao ='"+id+"'";

    ResultSet rs=state.executeQuery(sql);while(rs.next())

    {

    TeacherService.setGonghao(rs.getString(1));

    TeacherService.setXingming(rs.getString(2));

    TeacherService.setXingbie(rs.getString(3));

    TeacherService.setXueyuan(rs.getString(4));

    TeacherService.setZhicheng(rs.getString(5));

    }

    rs.close();

    state.close();

    conn.close();

    System.out.println("over");

    }catch(Exception e)

    {

    }

    }

    }

    packageStudent;importjava.sql.Connection;importjava.sql.PreparedStatement;importjava.sql.ResultSet;importjava.util.ArrayList;importjava.util.List;importLogin.DBUtil;importTeacher.KechengService;public classGet {public static ListgetAll()

    {

    List list=new ArrayList();

    Connection conn=DBUtil.getConn();

    PreparedStatement state=null;

    ResultSet rs=null;

    String sql="select * from class";try{

    state=conn.prepareStatement(sql);

    rs=state.executeQuery();while(rs.next())

    {if(rs.getInt(5)>rs.getInt(6))

    {

    KechengService user=newKechengService();

    user.setKechengbianhao(rs.getString(1));

    user.setKechengmingcheng(rs.getString(2));

    user.setGonghao(rs.getString(3));

    user.setRenkejiaoshi(rs.getString(4));

    user.setXianyourenshu(rs.getInt(6));

    list.add(user);

    }

    }

    rs.close();

    state.close();

    conn.close();

    }catch(Exception e)

    {

    }if(list!=null) {returnlist;

    }else{return null;

    }

    }public static ListgetAll0()

    {

    List list=new ArrayList();

    Connection conn=DBUtil.getConn();

    PreparedStatement state=null;

    ResultSet rs=null;

    String sql="select * from class";try{

    state=conn.prepareStatement(sql);

    rs=state.executeQuery();while(rs.next())

    {

    KechengService user=newKechengService();

    user.setKechengbianhao(rs.getString(1));

    user.setKechengmingcheng(rs.getString(2));

    user.setGonghao(rs.getString(3));

    user.setRenkejiaoshi(rs.getString(4));

    user.setXianyourenshu(rs.getInt(6));

    list.add(user);

    }

    rs.close();

    state.close();

    conn.close();

    }catch(Exception e)

    {

    }if(list!=null) {returnlist;

    }else{return null;

    }

    }

    }

    packageStudent;public classJieguo {

    String kechengbianhao;

    String jiaoshixingming;

    String gonghao;

    String xuehao;

    String xingming;publicString getGonghao() {returngonghao;

    }public voidsetGonghao(String gonghao) {this.gonghao =gonghao;

    }publicString getKechengbianhao() {returnkechengbianhao;

    }public voidsetKechengbianhao(String kechengbianhao) {this.kechengbianhao =kechengbianhao;

    }publicString getJiaoshixingming() {returnjiaoshixingming;

    }public voidsetJiaoshixingming(String jiaoshixingming) {this.jiaoshixingming =jiaoshixingming;

    }publicString getXuehao() {returnxuehao;

    }public voidsetXuehao(String xuehao) {this.xuehao =xuehao;

    }publicString getXingming() {returnxingming;

    }public voidsetXingming(String xingming) {this.xingming =xingming;

    }

    }

    packageStudent;public classKechengService {staticString kechengbianhao;staticString kechengmingcheng;staticString renkejiaoshi;static intxianyourenshu;static intrenshushangxian;public static intgetRenshushangxian() {returnrenshushangxian;

    }public static void setRenshushangxian(intrenshushangxian) {

    KechengService.renshushangxian=renshushangxian;

    }public staticString getKechengbianhao() {returnkechengbianhao;

    }public static voidsetKechengbianhao(String kechengbianhao) {

    KechengService.kechengbianhao=kechengbianhao;

    }public staticString getKechengmingcheng() {returnkechengmingcheng;

    }public static voidsetKechengmingcheng(String kechengmingcheng) {

    KechengService.kechengmingcheng=kechengmingcheng;

    }public staticString getRenkejiaoshi() {returnrenkejiaoshi;

    }public static voidsetRenkejiaoshi(String renkejiaoshi) {

    KechengService.renkejiaoshi=renkejiaoshi;

    }public static intgetXianyourenshu() {returnxianyourenshu;

    }public static void setXianyourenshu(intxianyourenshu) {

    KechengService.xianyourenshu=xianyourenshu;

    }

    }

    packageStudent;importjava.io.IOException;importjava.util.List;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importLogin.Power;importTeacher.KechengService;/*** Servlet implementation class LLKEServlet*/@WebServlet("/LLKCServlet")public class LLKCServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicLLKCServlet() {super();//TODO Auto-generated constructor stub

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("submit"))

    {

    List userall =Get.getAll0();

    java.util.Collections.reverse(userall);

    arg0.setAttribute("all", userall);

    arg0.getRequestDispatcher("student/liulan.jsp").forward(arg0, arg1);

    }if(function.equals("kecheng"))

    {

    String kechengbianhao=arg0.getParameter("kechengbianhao");

    Find f=newFind();

    f.findclass("class", kechengbianhao);

    arg0.getRequestDispatcher("student/kecheng.jsp").forward(arg0, arg1);

    }if(function.equals("jiaoshi"))

    {

    String gonghao;

    gonghao=arg0.getParameter("gonghao");

    Find f=newFind();

    f.findjiaoshi("teacher", gonghao);

    arg0.getRequestDispatcher("student/jiaoshi.jsp").forward(arg0, arg1);

    }

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    packageStudent;importjava.sql.Connection;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;importLogin.DBUtil;public classSelect {public booleanselect(String table,String kechengbianhao,String xuehao)

    {boolean c=true;

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="select * from "+table;

    ResultSet rs=state.executeQuery(sql);while(rs.next())

    {if(kechengbianhao.equals(rs.getString(1))&&xuehao.equals(rs.getString(4)))

    {

    c=false;

    }

    }

    rs.close();

    state.close();

    conn.close();

    }catch(Exception e)

    {

    }returnc;

    }

    }

    packageStudent;public classService {staticString xuehao;staticString xingming;staticString xingbie;staticString banji;staticString zhuanye;public staticString getXuehao() {returnxuehao;

    }public static voidsetXuehao(String xuehao) {

    Service.xuehao=xuehao;

    }public staticString getXingming() {returnxingming;

    }public static voidsetXingming(String xingming) {

    Service.xingming=xingming;

    }public staticString getXingbie() {returnxingbie;

    }public static voidsetXingbie(String xingbie) {

    Service.xingbie=xingbie;

    }public staticString getBanji() {returnbanji;

    }public static voidsetBanji(String banji) {

    Service.banji=banji;

    }public staticString getZhuanye() {returnzhuanye;

    }public static voidsetZhuanye(String zhuanye) {

    Service.zhuanye=zhuanye;

    }

    }

    packageStudent;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importLogin.Power;/*** Servlet implementation class SXiugaiServlet*/@WebServlet("/SXiugaiServlet")public class SXiugaiServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicSXiugaiServlet() {super();//TODO Auto-generated constructor stub

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("submit"))

    {

    Find f=newFind();

    f.find("student", Power.getXingming());

    arg0.getRequestDispatcher("student/xiugaixinxi.jsp").forward(arg0, arg1);

    }if(function.equals("xiugai"))

    {

    Change c=newChange();

    String xingming;

    xingming=arg0.getParameter("xingming");

    String xingbie;

    xingbie=arg0.getParameter("xingbie");

    String banji;

    banji=arg0.getParameter("banji");

    String zhuanye;

    zhuanye=arg0.getParameter("zhuanye");

    c.change("jieguo", "xingming", "xuehao", xingming, Service.getXuehao());

    c.change("login", "name", "username", xingming, Power.getUsername());

    Power.setUsername(xingming);

    c.change("student", "xingming", "xuehao", xingming, Service.getXuehao());

    c.change("student", "xingbie", "xuehao", xingbie, Service.getXuehao());

    c.change("student", "xueyuan", "xuehao", banji, Service.getXuehao());

    c.change("student", "zhicheng", "xuehao", zhuanye, Service.getXuehao());

    arg0.setAttribute("message", "修改成功");

    arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);

    }

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    packageStudent;public classTeacherService {staticString gonghao;staticString xingming;staticString xingbie;staticString xueyuan;staticString zhicheng;public staticString getGonghao() {returngonghao;

    }public static voidsetGonghao(String gonghao) {

    TeacherService.gonghao=gonghao;

    }public staticString getXingming() {returnxingming;

    }public static voidsetXingming(String xingming) {

    TeacherService.xingming=xingming;

    }public staticString getXingbie() {returnxingbie;

    }public static voidsetXingbie(String xingbie) {

    TeacherService.xingbie=xingbie;

    }public staticString getXueyuan() {returnxueyuan;

    }public static voidsetXueyuan(String xueyuan) {

    TeacherService.xueyuan=xueyuan;

    }public staticString getZhicheng() {returnzhicheng;

    }public static voidsetZhicheng(String zhicheng) {

    TeacherService.zhicheng=zhicheng;

    }

    }

    packageStudent;importjava.io.IOException;importjava.util.List;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importLogin.Power;importTeacher.KechengService;/*** Servlet implementation class XuankeServlet*/@WebServlet("/XuankeServlet")public class XuankeServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicXuankeServlet() {super();//TODO Auto-generated constructor stub

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("submit"))

    {

    List userall =Get.getAll();

    java.util.Collections.reverse(userall);

    arg0.setAttribute("all", userall);

    arg0.getRequestDispatcher("student/xuanke.jsp").forward(arg0, arg1);

    }if(function.equals("xuanke"))

    {

    Change c=newChange();

    Jieguo j=newJieguo();

    Find f=newFind();

    f.find("student", Power.getXingming());

    String jiaoshixingming;

    jiaoshixingming=arg0.getParameter("jiaoshixingming");

    j.setJiaoshixingming(jiaoshixingming);

    String kechengbianhao;

    kechengbianhao=arg0.getParameter("kechengbianhao");

    j.setKechengbianhao(kechengbianhao);

    String xianyourenshu;

    xianyourenshu=arg0.getParameter("xianyourenshu");

    String gonghao;

    gonghao=arg0.getParameter("gonghao");

    j.setGonghao(gonghao);

    j.setXingming(Service.getXingming());

    j.setXuehao(Service.getXuehao());int num=Integer.parseInt(xianyourenshu);

    num++;

    System.out.println(num);

    Select s=newSelect();

    flag=s.select("jieguo",kechengbianhao,Service.getXuehao());if(flag)

    {

    c.change("class", "xianyourenshu", "kechengbianhao", num+"", kechengbianhao);

    Add a=newAdd();

    a.add("jieguo", j);

    arg0.setAttribute("message", "选课成功");

    arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);

    }else{

    arg0.setAttribute("message", "选课重复");

    arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);

    }

    }

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    Teacher包中的文件：

    packageTeacher;importjava.sql.Connection;importjava.sql.SQLException;importjava.sql.Statement;importLogin.DBUtil;public classAdd {public booleanadd(String table,KechengService en)

    {boolean c=false;

    String sql="insert into "+table+"(kechengbianhao,kechengmingcheng,gonghao,renkejiaoshi,renshushangxian,xianyourenshu) values('"+en.getKechengbianhao()+"','"+en.getKechengmingcheng()+"','"+en.getGonghao()+"','"+en.getRenkejiaoshi()+"','"+en.getRenshushangxian()+"','"+en.getXianyourenshu()+"');";

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();int num=state.executeUpdate(sql);if(num!=0)

    c=true;

    state.close();

    conn.close();

    }catch(SQLException e) {//TODO Auto-generated catch block//e.printStackTrace();

    }returnc;

    }

    }

    packageTeacher;importjava.sql.Connection;importjava.sql.SQLException;importjava.sql.Statement;importLogin.DBUtil;public classChange {public booleanchange(String table,String lie,String lie0,String gai,String biao)

    {

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="update "+table+" set "+lie+"='"+gai+"' where "+lie0+"='"+biao+"'";

    System.out.println(sql);

    state.executeUpdate(sql);

    state.close();

    conn.close();

    }catch(SQLException e) {//TODO Auto-generated catch block

    e.printStackTrace();

    }return true;

    }

    }

    packageTeacher;importjava.sql.Connection;importjava.sql.ResultSet;importjava.sql.Statement;importLogin.DBUtil;public classFind {public booleanfind(String table,String id)

    {booleanc;

    Connection conn=DBUtil.getConn();

    Statement state=null;try{

    state=conn.createStatement();

    String sql="select * from "+table+" where xingming ='"+id+"'";

    ResultSet rs=state.executeQuery(sql);while(rs.next())

    {

    Service.setGonghao(rs.getString(1));

    Service.setXingming(rs.getString(2));

    Service.setXingbie(rs.getString(3));

    Service.setXueyuan(rs.getString(4));

    Service.setZhicheng(rs.getString(5));

    }

    rs.close();

    state.close();

    conn.close();

    System.out.println("over");

    }catch(Exception e)

    {

    }return true;

    }

    }

    packageTeacher;importjava.sql.Connection;importjava.sql.PreparedStatement;importjava.sql.ResultSet;importjava.util.ArrayList;importjava.util.List;importLogin.DBUtil;public classGet {public static ListgetAll(String id)

    {

    List list=new ArrayList();

    Connection conn=DBUtil.getConn();

    PreparedStatement state=null;

    ResultSet rs=null;

    String sql="select * from class where gonghao ='"+id+"'";try{

    state=conn.prepareStatement(sql);

    rs=state.executeQuery();while(rs.next())

    {

    KechengService user=newKechengService();

    user.setKechengbianhao(rs.getString(1));

    user.setKechengmingcheng(rs.getString(2));

    user.setGonghao(rs.getString(3));

    user.setRenkejiaoshi(rs.getString(4));

    user.setXianyourenshu(rs.getInt(6));

    list.add(user);

    }

    rs.close();

    state.close();

    conn.close();

    }catch(Exception e)

    {

    }if(list!=null) {returnlist;

    }else{return null;

    }

    }public static ListgetAllxs(String bianhao)

    {

    List list=new ArrayList();

    Connection conn=DBUtil.getConn();

    PreparedStatement state=null;

    ResultSet rs=null;

    String sql="select * from jieguo";try{

    state=conn.prepareStatement(sql);

    rs=state.executeQuery();while(rs.next())

    {if(rs.getString(1).equals(bianhao))

    {

    Xuesheng user=newXuesheng();

    user.setXingming(rs.getString(4));

    user.setXuehao(rs.getString(3));

    list.add(user);

    }

    }

    rs.close();

    state.close();

    conn.close();

    }catch(Exception e)

    {

    }if(list!=null) {returnlist;

    }else{return null;

    }

    }

    }

    packageTeacher;public classKechengService {

    String kechengbianhao;

    String kechengmingcheng;

    String renkejiaoshi;intrenshushangxian;intxianyourenshu;

    String gonghao;publicString getGonghao() {returngonghao;

    }public voidsetGonghao(String gonghao) {this.gonghao =gonghao;

    }publicString getKechengbianhao() {returnkechengbianhao;

    }public voidsetKechengbianhao(String kechengbianhao) {this.kechengbianhao =kechengbianhao;

    }publicString getKechengmingcheng() {returnkechengmingcheng;

    }public voidsetKechengmingcheng(String kechengmingcheng) {this.kechengmingcheng =kechengmingcheng;

    }publicString getRenkejiaoshi() {returnrenkejiaoshi;

    }public voidsetRenkejiaoshi(String renkejiaoshi) {this.renkejiaoshi =renkejiaoshi;

    }public intgetRenshushangxian() {returnrenshushangxian;

    }public void setRenshushangxian(intrenshushangxian) {this.renshushangxian =renshushangxian;

    }public intgetXianyourenshu() {returnxianyourenshu;

    }public void setXianyourenshu(intxianyourenshu) {this.xianyourenshu =xianyourenshu;

    }

    }

    packageTeacher;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importLogin.Power;importLogin.Select;/*** Servlet implementation class KechengServlet*/@WebServlet("/KechengServlet")public class KechengServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicKechengServlet() {super();//TODO Auto-generated constructor stub

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    Select s=newSelect();

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("submit"))

    {

    Find f=newFind();

    f.find("teacher", Power.getXingming());

    Add a=newAdd();

    KechengService ks=newKechengService();

    String kechengbianhao;

    kechengbianhao=arg0.getParameter("kechengbianhao");

    ks.setKechengbianhao(kechengbianhao);

    String kechengmingcheng;

    kechengmingcheng=arg0.getParameter("kechengmingcheng");

    ks.setKechengmingcheng(kechengmingcheng);

    String renkejiaoshi;

    renkejiaoshi=Power.getXingming();

    String gonghao;

    gonghao=Service.getGonghao();

    ks.setGonghao(gonghao);

    ks.setRenkejiaoshi(renkejiaoshi);

    String renshushangxian;

    renshushangxian=arg0.getParameter("renshushangxian");int num=Integer.parseInt(renshushangxian);

    ks.setRenshushangxian(num);

    ks.setXianyourenshu(0);

    a.add("class", ks);

    arg0.setAttribute("message", "添加成功");

    arg0.getRequestDispatcher("teacher/tianjiakecheng.jsp").forward(arg0, arg1);

    }

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    packageTeacher;importjava.io.IOException;importjava.util.List;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importLogin.Power;importLogin.Select;/*** Servlet implementation class LiulanServlet*/@WebServlet("/LiulanServlet")public class LiulanServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicLiulanServlet() {super();//TODO Auto-generated constructor stub

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    Select s=newSelect();

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("liulan"))

    {

    List userall =Get.getAll(Service.getGonghao());

    java.util.Collections.reverse(userall);

    arg0.setAttribute("all", userall);

    arg0.getRequestDispatcher("teacher/liulanxuanke.jsp").forward(arg0, arg1);

    }if(function.equals("xiangxi"))

    {

    String kechengbianhao;

    kechengbianhao=arg0.getParameter("kechengbianhao");

    List userall =Get.getAllxs(kechengbianhao);

    java.util.Collections.reverse(userall);

    arg0.setAttribute("all", userall);

    arg0.getRequestDispatcher("teacher/xiangxi.jsp").forward(arg0, arg1);

    }

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    packageTeacher;public classService {staticString gonghao;staticString xingming;staticString xingbie;staticString xueyuan;public staticString getGonghao() {returngonghao;

    }public static voidsetGonghao(String gonghao) {

    Service.gonghao=gonghao;

    }public staticString getXingming() {returnxingming;

    }public static voidsetXingming(String xingming) {

    Service.xingming=xingming;

    }public staticString getXingbie() {returnxingbie;

    }public static voidsetXingbie(String xingbie) {

    Service.xingbie=xingbie;

    }public staticString getXueyuan() {returnxueyuan;

    }public static voidsetXueyuan(String xueyuan) {

    Service.xueyuan=xueyuan;

    }public staticString getZhicheng() {returnzhicheng;

    }public static voidsetZhicheng(String zhicheng) {

    Service.zhicheng=zhicheng;

    }staticString zhicheng;

    }

    packageTeacher;importjava.io.IOException;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importLogin.Power;/*** Servlet implementation class TXiugaiServlet*/@WebServlet("/TXiugaiServlet")public class TXiugaiServlet extendsHttpServlet {private static final long serialVersionUID = 1L;/***@seeHttpServlet#HttpServlet()*/

    publicTXiugaiServlet() {super();//TODO Auto-generated constructor stub

    }protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throwsServletException, IOException

    {

    arg0.setCharacterEncoding("utf-8");

    arg1.setCharacterEncoding("utf-8");booleanflag;

    String function=arg0.getParameter("method");if(function.equals("submit"))

    {

    Find f=newFind();

    f.find("teacher", Power.getXingming());

    arg0.getRequestDispatcher("teacher/xiugaixinxi.jsp").forward(arg0, arg1);

    }if(function.equals("xiugai"))

    {

    Change c=newChange();

    String xingming;

    xingming=arg0.getParameter("xingming");

    String xingbie;

    xingbie=arg0.getParameter("xingbie");

    String xueyuan;

    xueyuan=arg0.getParameter("xueyuan");

    String zhicheng;

    zhicheng=arg0.getParameter("zhicheng");

    c.change("class", "renkejiaoshi", "gonghao", xingming, Service.getGonghao());

    c.change("login", "name", "username", xingming, Power.getUsername());

    Power.setUsername(xingming);

    c.change("teacher", "xingming", "gonghao", xingming, Service.getGonghao());

    c.change("teacher", "xingbie", "gonghao", xingbie, Service.getGonghao());

    c.change("teacher", "xueyuan", "gonghao", xueyuan, Service.getGonghao());

    c.change("teacher", "zhicheng", "gonghao", zhicheng, Service.getGonghao());

    arg0.setAttribute("message", "修改成功");

    arg0.getRequestDispatcher("Right.jsp").forward(arg0, arg1);

    }

    }/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    response.getWriter().append("Served at: ").append(request.getContextPath());

    }/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

    doGet(request, response);

    }

    }

    packageTeacher;public classXuesheng {

    String xingming;

    String xuehao;publicString getXingming() {returnxingming;

    }public voidsetXingming(String xingming) {this.xingming =xingming;

    }publicString getXuehao() {returnxuehao;

    }public voidsetXuehao(String xuehao) {this.xuehao =xuehao;

    }

    }

    JSP文件中：

    guanli文件夹：

    Insert title here

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    账号
    密码
    工号：
    姓名：
    性别：
    所在学院：
    职称：
    Insert title here

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    账号
    密码
    学号：
    姓名：
    性别：
    班级：
    专业：

    student文件夹中：

    Insert title here
    工号：
    任课教师
    教师性别
    学院：
    职称
    Insert title here
    课程编号：
    课程名称：
    任课教师：
    课程容量：
    现有人数：
    Insert title here
    课程名称课程编号任课教师
    ${stu.getKechengmingcheng() }${stu.getKechengbianhao() }${stu.getRenkejiaoshi() }
    Insert title here

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    学号
    姓名>
    性别>
    班级>
    专业>
    Insert title here
    课程名称课程编号任课教师操作
    ${stu.getKechengmingcheng() }${stu.getKechengbianhao() }${stu.getRenkejiaoshi() }选课

    teacher文件中的：

    Insert title here
    课程名称课程编号现有人数
    ${stu.getKechengmingcheng()}${stu.getKechengbianhao() }${stu.getXianyourenshu() }
    Insert title here

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    课程编号
    课程名称
    课程人数
    Insert title here
    姓名学号
    ${stu.getXingming() }${stu.getXuehao() }
    Insert title here

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    工号
    姓名>
    性别>
    所在学院>
    职称>

    最下面的JSP文件：

    Insert title here

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    Insert title here

    margin:0;

    padding:0;

    font-size: 12px;

    font-family: "Microsoft Yahei", Verdana, Arial, Helvetica, sans-serif

    }

    .leftMenu {

    min-width:220px;

    width:268px;

    margin:40px auto0auto;

    }

    .menu {

    border: #bdd7f2 1px solid;

    border-top: #0080c4 4px solid;

    border-bottom: #0080c4 4px solid;

    background: #f4f9ff repeat-y right;

    margin-left: 10px;

    }

    .menu .ListTitle {

    border-bottom: 1px #98c9ee solid;

    display: block;

    text-align: center;/*position: relative;*/height: 38px;

    line-height: 38px;

    cursor: pointer;/*+min-width:220px;*/

    +width:100%;

    }

    .ListTitlePanel {

    position: relative;

    }

    .leftbgbt {

    position: absolute;

    background: no-repeat;

    width: 11px;

    height: 52px;

    left:-11px;

    top:-4px;

    }/*.leftbgbt {

    float:left;

    background: no-repeat;

    width: 11px;

    height: 52px;

    left: 0px;

    top: 0px;

    zoom:1;

    z-index:200px;

    }*/.leftbgbt2 {

    position: absolute;

    background: no-repeat;

    width: 11px;

    height: 48px;

    left:-11px;

    top:-1px;

    }

    .menuList {

    display: block;

    height: auto;

    }

    .menuList div {

    height: 28px;

    line-height: 24px;

    border-bottom: 1px #98c9ee dotted;

    }

    .menuList div a {

    display: block;

    background: #fff;

    line-height: 28px;

    height: 28px;

    color: #185697;

    text-decoration: none;

    }

    .menuList div a:hover {

    color: #f30;

    background: #0080c4;

    color: #fff;

    }

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    int message=Power.getFlag();%>

    >

    管理

    if(message==0)

    {%>

    if(message==1)

    {%>

    if(message==2)

    {%>

    登录

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    账号：
    密码：
    身份：

    管理员

    教师

    学生

    Insert title here

    //

    //接收servlet传过来的那个message的参数//alert是js语句中的弹出警示框，也就是弹出message中的参数

    Object message=request.getAttribute("message");if(!(message==null||message.equals("")))

    {%>

    Insert title here

    流转系统

    首 页     退出

    以上的代码均按顺序发出。

    现在发一些运行图：

    af6f7f65ef91d59a4f2e6902052f1ac7.png

    管理员：

    5399d76e34be8477aadd9be6a5402a55.png

    学生：

    abde3494638767710bb945a830fcb371.png

    375fd0fbd5f17cc6875280b286364d56.png

    932ddeb9ccacd5cb52dcd63023576517.png

    教师：

    d7b543c4aa61eb2de0f40054bbc0306d.png

    4ae28fdce072a558bc98877aaf3fea19.png

    收起
    展开全文

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    教师添加课程信息与学生信息，修改课程成绩，
    管理员进行教师管理，课程管理，学生管理，选课管理

    首先我们需要了解数据库表的结构
    教师表
    在这里插入图片描述
    学生表
    在这里插入图片描述
    课程表
    在这里插入图片描述
    选课表
    在这里插入图片描述
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    在这里插入图片描述
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    项目效果图展示

    在这里插入图片描述
    在这里插入图片描述
    在这里插入图片描述
    在这里插入图片描述
    在这里插入图片描述
    在这里插入图片描述
    在这里插入图片描述
    在这里插入图片描述
    在这里插入图片描述
    以上便是学生选课系统的展示模块，该系统的开发关键在于理解各个角色之间的关系，以及对该套数据库工具的熟练使用。
    以上便是学生选课系统的详细内容，码字不易，给个赞呗,哈哈哈

    数据库工具类即相关功能开发欲了解可参考博主这边博文

    数据库工具类讲解与实现一个销售系统

    收起
    展开全文

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     2022-04-22 22:58:48
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    用户菜单、学生管理、教师管理、课程管理、成绩排名查询请添加图片描述
    请添加图片描述
    请添加图片描述

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    课程设计，大作业，毕业设计，项目练习，学习演示等

            if(StringUtils.isEmpty(user.getUserName())){
            return MapControl.getInstance().error("请填写用户名").getMap();
        }
        if(StringUtils.isEmpty(user.getName())){
            return MapControl.getInstance().error("请填写名称").getMap();
        }
        if(StringUtils.isEmpty(user.getUserPwd())){
            return MapControl.getInstance().error("请填写密码").getMap();
        }
        int result = userService.create(user);
        if (result <= 0) {
            return MapControl.getInstance().error().getMap();
        }
        return MapControl.getInstance().success().getMap();
    }
    /**
     * 根据id删除
     * @param id
     * @return
     */
    @PostMapping("/delete/{id}")
    @ResponseBody
    public Map<String, Object> delete(@PathVariable("id") Integer id) {
        int result = userService.delete(id);
        if (result <= 0) {
            return MapControl.getInstance().error().getMap();

                return MapControl.getInstance().error("请填写身份证号").getMap();
        }
        if(StringUtils.isEmpty(student.getPhone())){
            return MapControl.getInstance().error("请填写手机号码").getMap();
        }
        int result = studentService.saveU(student);
        if (result <= 0) {
            return MapControl.getInstance().error().getMap();
        }
        return MapControl.getInstance().success().getMap();
    }
    //根据id查询，跳转修改页面
    @GetMapping("/edit/{id}")
    public String detail(@PathVariable("id") Integer id, ModelMap modelMap) {
        //查询出要修改的学生的信息
        Student student = studentService.detail(id);
        //查询所有的专业
        List<Subject> subjects = subjectService.query(null);
        //将查询出来的数据存储到request域，实现表单回显
        modelMap.addAttribute("student", student);
        modelMap.addAttribute("subjects", subjects);
        return "student/edit";
    }
    //查询所有
    @PostMapping("/query")

            //查询出要修改的学生的信息
        Student student = studentService.detail(id);
        //查询所有的专业
        List<Subject> subjects = subjectService.query(null);
        //将查询出来的数据存储到request域，实现表单回显
        modelMap.addAttribute("student", student);
        modelMap.addAttribute("subjects", subjects);
        return "student/edit";
    }
    //查询所有
    @PostMapping("/query")
    @ResponseBody
    public Map<String, Object> query(@RequestBody Student student) {
        //查询所有的学生信息
        List<Student> list = studentService.query(student);
        //查询所有的专业
        List<Subject> subjects = subjectService.query(null);
        //查询所有的班级
        List<Clazz> clazzes = clazzService.query(null);
        //设置关联
        list.forEach(entity -> {
            subjects.forEach(subject -> {
                //判断学生表中的subjectId和专业表的id是否一致
                if (subject.getId() == entity.getSubjectId()) {
                    entity.setSubject(subject);
                }
            });

         * 编辑用户信息操作
     * @param user
     * @return
     */
    @PostMapping("/edit")
    @ResponseBody
    public Map<String, Object> edit(@RequestBody User user) {
        if(StringUtils.isEmpty(user.getUserName())){
            return MapControl.getInstance().error("请填写用户名").getMap();
        }
        if(StringUtils.isEmpty(user.getName())){
            return MapControl.getInstance().error("请填写名称").getMap();
        }
        if(StringUtils.isEmpty(user.getUserPwd())){
            return MapControl.getInstance().error("请填写密码").getMap();
        }
        int result = userService.update(user);
        if (result <= 0) {
            return MapControl.getInstance().error().getMap();
        }
        return MapControl.getInstance().success().getMap();

                    //判断学生表的subjectId和专业表的id是否一致
                if (subject.getId() == entity.getSubjectId()) {
                    entity.setSubject(subject);
                }
            });
            clazzes.forEach(clazz -> {
                //判断学生表的clazzId和班级表的id是否一致
                if (clazz.getId() == entity.getClazzId()) {
                    entity.setClazz(clazz);
                }
            });
        });
        return MapControl.getInstance().success().add("data", students).getMap();
    }
}
用户管理操作：
/**
 * 用户管理操作
 */
@Controller

                    return MapControl.getInstance().success().add("data", user).getMap();
            } else {
                return MapControl.getInstance().error("用户名或密码错误").getMap();
            }
        }
        if ("2".equals(type)) { //老师验证登录
            Teacher teacher = teacherService.login(userName, MD5Utils.getMD5(password));
            if (teacher != null) {
                session.setAttribute("user", teacher);
                session.setAttribute("type", "2");
                return MapControl.getInstance().success().add("data", teacher).getMap();
            } else {
                return MapControl.getInstance().error("用户名或密码错误").getMap();

                Teacher teacher = teacherService.login(userName, MD5Utils.getMD5(password));
            if (teacher != null) {
                session.setAttribute("user", teacher);
                session.setAttribute("type", "2");
                return MapControl.getInstance().success().add("data", teacher).getMap();
            } else {
                return MapControl.getInstance().error("用户名或密码错误").getMap();
            }
        }
        if ("3".equals(type)) { //学生验证登录
            Student student = studentService.login(userName, MD5Utils.getMD5(password));
            if (student != null) {
                session.setAttribute("user", student);
                session.setAttribute("type", "3");
                return MapControl.getInstance().success().add("data", student).getMap();
            } else {
                return MapControl.getInstance().error("用户名或密码错误").getMap();
            }
        }
        return MapControl.getInstance().getMap();
    }
学生管理控制层：

        @Autowired
    private SubjectService subjectService;
    @Autowired
    private ClazzService clazzService;
    //跳转添加页面
    @GetMapping("/add")
    public String add(ModelMap modelMap) {
        //查询所有的专业，存储到request域
        List<Subject> subjects = subjectService.query(null);
        modelMap.addAttribute("subjects", subjects);
        return "student/add";
    }
    /**
     * 学生添加操作
     * @param student
     * @return
     */
    @PostMapping("/add")
    @ResponseBody
    public Map<String, Object> add(@RequestBody Student student) {

                    //判断学生表中的subjectId和专业表的id是否一致
                if (subject.getId() == entity.getSubjectId()) {
                    entity.setSubject(subject);
                }
            });
            clazzes.forEach(clazz -> {
                //判断学生表中的clazzId和班级表的id是否一致
                if (clazz.getId() == entity.getClazzId()) {
                    entity.setClazz(clazz);
                }
            });
        });
        //查询总记录条数

            //查询所有的专业，存储到request域
        List<Subject> subjects = subjectService.query(null);
        modelMap.addAttribute("subjects", subjects);
        return "student/add";
    }
    /**
     * 学生添加操作
     * @param student
     * @return
     */
    @PostMapping("/add")
    @ResponseBody
    public Map<String, Object> add(@RequestBody Student student) {
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