java Date获取 年月日时分秒
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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
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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); } } |
这里有个博客http://www.blogjava.net/xiaoyi/articles/295044.html,里面有一些常用方法的实现,可以参考,自己在优化