Java 根据两个日期算是相差的日，周，天数

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前言 : 死并不是唯一报恩方式，人家并不是要你死才救你的，让人家救回一命，又跑去死，是懦夫才会做的事！

package com.shao.calendar;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class Test {     private static final String DAY = "day";     private static final String WEEK = "week";     private static final String MONTH = "month";    /**     * @param args     */    public static void main(String[] args) {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        String startTime = sdf.format(new Date());        String endTime = "2016-09-01";        int time = timeBettwen(startTime, endTime, WEEK);        System.out.println(time);    }    private static int timeBettwen(String startTime, String endTime, String datetype) {        //天数        int days = 0;        int weeks = 0;        int months = 0;        try {            //时间转换类            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");            Date date1 = sdf.parse(startTime);            Date date2 = sdf.parse(endTime);            Calendar can1 = Calendar.getInstance();            can1.setTime(date1);            Calendar can2 = Calendar.getInstance();            can2.setTime(date2);            int year1 = can1.get(Calendar.YEAR);            int year2 = can2.get(Calendar.YEAR);            Calendar can = null;            if(can1.before(can2)){                days -= can1.get(Calendar.DAY_OF_YEAR);                days += can2.get(Calendar.DAY_OF_YEAR);                weeks -= can1.get(Calendar.WEEK_OF_YEAR);                weeks += can2.get(Calendar.WEEK_OF_YEAR);                months -= can1.get(Calendar.MONTH);                months += can2.get(Calendar.MONTH);                can = can1;            }else{                days -= can2.get(Calendar.DAY_OF_YEAR);                days += can1.get(Calendar.DAY_OF_YEAR);                weeks -= can2.get(Calendar.WEEK_OF_YEAR);                weeks += can1.get(Calendar.WEEK_OF_YEAR);                months -= can2.get(Calendar.MONTH);                months += can1.get(Calendar.MONTH);                can = can2;            }            for (int i = 0; i < Math.abs(year2-year1); i++) {                days += can.getActualMaximum(Calendar.DAY_OF_YEAR);                weeks += can.getActualMaximum(Calendar.WEEK_OF_YEAR);                months += can.getActualMaximum(Calendar.MONTH) + 1;                can.add(Calendar.YEAR, 1);            }        } catch (ParseException e) {            e.printStackTrace();        }        if (datetype.equals(DAY)) {            return days;        } else if (datetype.equals(WEEK)) {            return weeks;        } else if (datetype.equals(MONTH)) {            return months;        }        return 0;    }}

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