import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class GetCurrentTime {
    
    static void useDate() {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
    System.out.println(sdf.format(date));
    }
    
    static void useCalendar() {
    Calendar ca = Calendar.getInstance();
    //System.out.println(ca);
    int year = ca.get(Calendar.YEAR);//获取年份
    int month = ca.get(Calendar.MONTH);//获取月份,从0-11开始
    int day = ca.get(Calendar.DATE);//获取天数
    int minute = ca.get(Calendar.MINUTE);//获取分钟
    int hour = ca.get(Calendar.HOUR);//获取小时
    int second = ca.get(Calendar.SECOND);//获取秒书
    int WeekOfYear = ca.get(Calendar.DAY_OF_WEEK);//获取一周的第几天         

    System.out.println("Date =  " + ca.getTime());
    System.out.printf("年 = %5d , 月 = %5d , 日 = %5d %n", year, month + 1,
        day);
    System.out.printf("时 = %5d , 分 = %5d , 秒 = %5d %n", hour, minute,
        second);
    System.out.println("WeekOfYear = " + WeekOfYear);//    
    }

    static void useDosCommand() {
    String ls_1;
    Process process;
    try {
        process = Runtime.getRuntime().exec("cmd /c echo %date% %time% ");
        BufferedReader bufferedReader = new BufferedReader(
            new InputStreamReader(process.getInputStream()));
        while ((ls_1 = bufferedReader.readLine()) != null)
        System.out.println(ls_1);
     
        process.waitFor();
    } catch (Exception e) {     
        e.printStackTrace();
    }

    }
    public static void main(String[] args) {
    System.out.println("*************方式1****************");
    useDate();
    System.out.println("*************方式2****************");
    useCalendar();
    System.out.println("*************方式3****************");
    useDosCommand();
    }
}
/*
*************方式1****************
2011-10-07 13:45:39.328
*************方式2****************
Date =  Fri Oct 07 13:45:39 CST 2011
年 =  2011 , 月 =    10 , 日 =     7 
时 =     1 , 分 =    45 , 秒 =    39 
WeekOfYear = 6
*************方式3****************
2011-10-07 星期五 13:45:39.37
 */

------解决方案--------------------
楼主，这个只要把("yyyy-MM-dd hh:mm:ss")中的hh换成HH就行了，hh表示12时制，HH表示24时制。

------解决方案--------------------
大家都好啊，才刷了一下就成五楼了

------解决方案--------------------
方法很多，这个也行
Java code

   Calendar c=Calendar.getInstance();
   c.setTime(new Date());
   c.get(Calendar.HOUR);
   System.out.println(c.getTime().toString());
   c.get(Calendar.HOUR_OF_DAY);
   System.out.println(c.getTime().toString());