转载自   java Date获取 年月日时分秒

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);}
}