java Date获取年月日时分秒

昵称16612357 2014-04-14

展开全文

package com.util; 
  
import java.text.DateFormat; 
import java.util.Calendar; 
import java.util.Date; 
  
  
public class Test { 
    public void getTimeByDate(){ 
        Date date = new Date(); 
        DateFormat df1 = DateFormat.getDateInstance();//日期格式，精确到日 
        System.out.println(df1.format(date)); 
        DateFormat df2 = DateFormat.getDateTimeInstance();//可以精确到时分秒 
        System.out.println(df2.format(date)); 
        DateFormat df3 = DateFormat.getTimeInstance();//只显示出时分秒 
        System.out.println(df3.format(date)); 
        DateFormat df4 = DateFormat.getDateTimeInstance(DateFormat.FULL,DateFormat.FULL); //显示日期，周，上下午，时间（精确到秒）  
        System.out.println(df4.format(date));   
        DateFormat df5 = DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.LONG); //显示日期,上下午，时间（精确到秒）  
        System.out.println(df5.format(date)); 
        DateFormat df6 = DateFormat.getDateTimeInstance(DateFormat.SHORT,DateFormat.SHORT); //显示日期，上下午,时间（精确到分）  
        System.out.println(df6.format(date)); 
        DateFormat df7 = DateFormat.getDateTimeInstance(DateFormat.MEDIUM,DateFormat.MEDIUM); //显示日期，时间（精确到分） 
        System.out.println(df7.format(date)); 
    } 
    public void getTimeByCalendar(){ 
        Calendar cal = Calendar.getInstance(); 
        int year = cal.get(Calendar.YEAR);//获取年份 
        int month=cal.get(Calendar.MONTH);//获取月份  
        int day=cal.get(Calendar.DATE);//获取日  
        int hour=cal.get(Calendar.HOUR);//小时  
        int minute=cal.get(Calendar.MINUTE);//分             
        int second=cal.get(Calendar.SECOND);//秒  
        int WeekOfYear = cal.get(Calendar.DAY_OF_WEEK);//一周的第几天 
        System.out.println("现在的时间是：公元"+year+"年"+month+"月"+day+"日      "+hour+"时"+minute+"分"+second+"秒       星期"+WeekOfYear); 
    } 
    public static void main(String[] args) { 
        Test t=new Test(); 
        t.getTimeByDate(); 
        System.out.println("****************************"); 
        t.getTimeByCalendar(); 
    } 
}

获取日，如果大于16则+2个月，否则+1个月，输出7个月

public static void main(String[] as) throws Exception { 
    int j; 
    Calendar cc = Calendar.getInstance(); 
    int myYear = cc.get(Calendar.YEAR);  
    int myMonth = cc.get(Calendar.MONTH); 
    j=cc.get(Calendar.DATE)>16?3:2; 
    cc.set(Calendar.MONTH, myMonth+j); 
    System.out.println(myYear+"-"+cc.get(cc.MONTH)); 
    for(int i=0;i<7;i++){ 
        cc.add(cc.MONTH, 1); 
        int mm = cc.get(cc.MONTH); 
        int mmm=mm==0?12:mm; 
        System.out.println(myYear+"-"+mmm); 
    } 
}