package UI;
import UI.MySystemUI;
import java.awt.EventQueue;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.border.LineBorder;


import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.Font;
import javax.swing.JPasswordField;
import javax.swing.JFormattedTextField;
import java.awt.Button;
import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

public class Login extends JFrame {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private JPanel LoginPanel;
	private JPasswordField passwordField;
	
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Login frame = new Login();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
	
	/**
	 * Create the frame.
	 */
	public Login() {
		/**
		 * 创建并设置登陆界面主面板
		 */
		setTitle("学生成绩管理系统登陆界面（1.0）");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 485, 343);
		setResizable(false);//禁止最大化
		setLocationRelativeTo(null);//居中
		/**
		 * 创建主布局Panel
		 */
		LoginPanel = new JPanel();
		LoginPanel.setBorder(new LineBorder(new Color(0, 0, 0)));
		setContentPane(LoginPanel);
		LoginPanel.setLayout(null); 
		/**
		 * 添加背景图片到JLabel中
		 */
		ImageIcon backimg;
		backimg=new ImageIcon("E:\\JavaECode\\GUIofManagementSystem\\src\\Picture\\Back.jpg");
		/**
		 * 创建一个账号标签
		 */
		JLabel IDLabel = new JLabel("账  号：");
		IDLabel.setFont(new Font("新宋体", Font.BOLD, 20));
		IDLabel.setForeground(Color.LIGHT_GRAY);
		IDLabel.setBounds(49, 170, 91, 38);
		IDLabel.setOpaque(false);
		LoginPanel.add(IDLabel);
		/**
		 * 创建一个密码标签
		 */
		JLabel PasswordLabel = new JLabel("密  码：");
		PasswordLabel.setOpaque(false);
		PasswordLabel.setForeground(Color.LIGHT_GRAY);
		PasswordLabel.setFont(new Font("新宋体", Font.BOLD, 20));
		PasswordLabel.setBounds(49, 221, 91, 38);
		LoginPanel.add(PasswordLabel);
		/**
		 * 登陆文本框
		 */
		final JFormattedTextField idTextField = new JFormattedTextField();
		idTextField.setForeground(Color.LIGHT_GRAY);
		idTextField.setToolTipText("");
		idTextField.setText("请输入您的账号");
		idTextField.setBounds(143, 175, 227, 33);
		//                             添加账号框事件
		idTextField.addMouseListener(new MouseListener() {
			
			public void mouseReleased(MouseEvent e) {
				// TODO 当用户松开鼠标按钮时发生
				
			}
			
			public void mousePressed(MouseEvent e) {
				// TODO 当用户按下鼠标按钮时发生.
				if(idTextField.getText().equals("请输入您的账号"))
				idTextField.setText(null);
				idTextField.setForeground(Color.BLACK);
				
			}
			
			public void mouseExited(MouseEvent e) {
				// TODO 当鼠标离开你所监听的组件时发生.
				
			}
			
			public void mouseEntered(MouseEvent e) {
				// TODO  当鼠标离开当前组件并进入你所监听的组件时激活事件.
				
			}
			
			public void mouseClicked(MouseEvent e) {
				// TODO 鼠标按下后松开
				
			}
		});
		
		LoginPanel.add(idTextField);
		/**
		 * 密码框
		 */
		passwordField = new JPasswordField();
		passwordField.setBounds(143, 221, 227, 33);
		LoginPanel.add(passwordField);
		/**
		 * 登陆按钮
		 */
		Button StdBtn = new Button("\u7BA1\u7406\u5458\u767B\u9646");
		StdBtn.addActionListener(new ActionListener() {
			@SuppressWarnings("deprecation")
			public void actionPerformed(ActionEvent e) {
				if(idTextField.getText().equals("1")&&passwordField.getText().equals("1")) {
					/**
					 * 登陆成功后自动关闭登陆界面进入到信息界面
					 */
					System.out.print("登陆成功");
					dispose();
					MySystemUI F=new MySystemUI();
					F.setVisible(true);
				}
				else {
					JOptionPane.showMessageDialog(null,"账户或密码错误，登陆失败！" ,null, JOptionPane.ERROR_MESSAGE);
				}
			}
		});
		StdBtn.setForeground(Color.DARK_GRAY);
		StdBtn.setFont(new Font("宋体", Font.BOLD, 17));
		StdBtn.setBackground(Color.LIGHT_GRAY);
		StdBtn.setBounds(178, 266, 110, 33);
		LoginPanel.add(StdBtn);
		/**
		 * 背景图片的设置
		 */
		JLabel BackgroundLabel = new JLabel(backimg);
		BackgroundLabel.setBounds(0, 0, 482, 309);
		LoginPanel.add(BackgroundLabel);
		
	}
}

运行结果：

上面是主界面，下面是登录界面