java合并时间区间,java计算月份间隔

package com.changchong.util;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.List;import org.junit.Test;/** * 根据一段时间区间，按月份拆分成多个时间段 * @author lxg * * 2016年9月5日下午6:18:36 */public class SplitDateUtil { @Test public void demo(){ List<KeyValueForDate> list = SplitDateUtil.getKeyValueForDate("2015-08-23","2016-06-10"); System.out.println("开始日期--------------结束日期"); for(KeyValueForDate date : list){ System.out.println(date.getStartDate()+"-----"+date.getEndDate()); } } /** * 根据一段时间区间，按月份拆分成多个时间段 * @param startDate 开始日期 * @param endDate 结束日期 * @return */ @SuppressWarnings("deprecation") public static List<KeyValueForDate> getKeyValueForDate(String startDate,String endDate) { List<KeyValueForDate> list = null; try { list = new ArrayList<KeyValueForDate>(); String firstDay = ""; String lastDay = ""; Date d1 = new SimpleDateFormat("yyyy-MM-dd").parse(startDate);// 定义起始日期 Date d2 = new SimpleDateFormat("yyyy-MM-dd").parse(endDate);// 定义结束日期 Calendar dd = Calendar.getInstance();// 定义日期实例 dd.setTime(d1);// 设置日期起始时间 Calendar cale = Calendar.getInstance(); Calendar c = Calendar.getInstance(); c.setTime(d2); int startDay = d1.getDate(); int endDay = d2.getDate(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); KeyValueForDate keyValueForDate = null; while (dd.getTime().before(d2)) {// 判断是否到结束日期 keyValueForDate = new KeyValueForDate(); cale.setTime(dd.getTime()); if(dd.getTime().equals(d1)){ cale.set(Calendar.DAY_OF_MONTH, dd .getActualMaximum(Calendar.DAY_OF_MONTH)); lastDay = sdf.format(cale.getTime()); keyValueForDate.setStartDate(sdf.format(d1)); keyValueForDate.setEndDate(lastDay); }else if(dd.get(Calendar.MONTH) == d2.getMonth() && dd.get(Calendar.YEAR) == c.get(Calendar.YEAR)){ cale.set(Calendar.DAY_OF_MONTH,1);//取第一天 firstDay = sdf.format(cale.getTime()); keyValueForDate.setStartDate(firstDay); keyValueForDate.setEndDate(sdf.format(d2)); }else { cale.set(Calendar.DAY_OF_MONTH,1);//取第一天 firstDay = sdf.format(cale.getTime()); cale.set(Calendar.DAY_OF_MONTH, dd .getActualMaximum(Calendar.DAY_OF_MONTH)); lastDay = sdf.format(cale.getTime()); keyValueForDate.setStartDate(firstDay); keyValueForDate.setEndDate(lastDay); } list.add(keyValueForDate); dd.add(Calendar.MONTH, 1);// 进行当前日期月份加1 } if(endDay<startDay){ keyValueForDate = new KeyValueForDate(); cale.setTime(d2); cale.set(Calendar.DAY_OF_MONTH,1);//取第一天 firstDay = sdf.format(cale.getTime()); keyValueForDate.setStartDate(firstDay); keyValueForDate.setEndDate(sdf.format(d2)); list.add(keyValueForDate); } } catch (ParseException e) { return null; } return list; }}class KeyValueForDate{ private String startDate; private String endDate; public String getStartDate() { return startDate; } public void setStartDate(String startDate) { this.startDate = startDate; } public String getEndDate() { return endDate; } public void setEndDate(String endDate) { this.endDate = endDate; }} 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133