public final static String getTimeString() {
String TimeString = "";
Calendar c = Calendar.getInstance();
int yyyy = c.get(Calendar.YEAR);
int mm = c.get(Calendar.MONTH) + 1;
int dd = c.get(Calendar.DAY_OF_MONTH);
int hh = c.get(Calendar.HOUR) + 8;//中国属于东八区，时间加8小时
int MM = c.get(Calendar.MINUTE);
int SS = c.get(Calendar.SECOND);
String sMonth = mm < 10 ? "0" + mm : "" + mm;
String sDay = dd < 10 ? "0" + dd : "" + dd;
String sHour = hh < 10 ? "0" + hh : "" + hh;
String sMinute = MM < 10 ? "0" + MM : "" + MM;
String sSecond = SS < 10 ? "0" + SS : "" + SS;
TimeString = yyyy + "." + sMonth + "." + sDay + " " + sHour + ":"+ sMinute + ":" + sSecond;
return TimeString; }

public final static String getTimeString() {
  String TimeString = "";
  Calendar c = Calendar.getInstance();
  int yyyy = c.get(Calendar.YEAR);
  int mm = c.get(Calendar.MONTH) + 1;
  int dd = c.get(Calendar.DAY_OF_MONTH);
  int hh = c.get(Calendar.HOUR) + 8;//中国属于东八区，时间加8小时
  int MM = c.get(Calendar.MINUTE);
  int SS = c.get(Calendar.SECOND);
  String sMonth = mm < 10 ? "0" + mm : "" + mm;
  String sDay = dd < 10 ? "0" + dd : "" + dd;
  String sHour = hh < 10 ? "0" + hh : "" + hh;
  String sMinute = MM < 10 ? "0" + MM : "" + MM;
  String sSecond = SS < 10 ? "0" + SS : "" + SS;
  TimeString = yyyy + "." + sMonth + "." + sDay + " " + sHour + ":"+ sMinute + ":" + sSecond;
  return TimeString;
 }

package com.sysc.simple;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class DateUtils {
public static void show() throws ParseException {
//获取当前日期
Calendar now = Calendar.getInstance();
int year = now.get(Calendar.YEAR);
int month = now.get(Calendar.MONTH) + 1;//注意月份
int day = now.get(Calendar.DAY_OF_MONTH);
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
int second = now.get(Calendar.SECOND);
long millis = now.getTimeInMillis();
System.out.println(now.getTime());
System.out.println(year + month + day + hour + minute + second + millis);
//日期格式化打印
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateNowStr = sdf.format(d);
System.out.println("格式化后的日期：" + dateNowStr);
//字符串解析为日期
String str = "2014-9-1 13:08:28";
Date today = sdf.parse(str);
System.out.println("字符串转成日期：" + today);
}
}

用java实现把当前时间转换成无符号的字符串
import java.util.Date;
import java.text.SimpleDateFormat;
public class CurrentTime
{
public String getCurrentTime()//获得当前时间
{
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
String time= dateFormat.format( now );
return time;
}
public String splitString(String str,String n)//字符拆分方法
{
String st[]=str.split(n);
str="";
for(int i=0;i{
str=str+st[i];
}
return str;
}
public String doChangedTime() //对字符进行拆分
{
String time,now;
time=getCurrentTime();
now=splitString(time,"\\:");
time=splitString(now,"/");
now=splitString(time," ");
return now;
}
public static void main(String ar[])
{
System.out.println(new CurrentTime().getCurrentTime());//字符拆分之前
System.out.println(new CurrentTime().doChangedTime());//字符拆分之后}
}