package com.xxx.xxx.util;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* @author BuShuangLi
* @date 2019/5/22
*/
public class MissingDateUtil {
/**
* 查询近几个月的月初和月末
* @param num 近五个月 num=5
* @return
*/
public static synchronized List<Map<String, Object>> getRecentMonths(int num){
List<Map<String, Object>> maps = new ArrayList<Map<String, Object>>();
//当前时所在月份的第一天和最后一天
SimpleDateFormat format=new SimpleDateFormat("yyyy-MM");
//设置startDate
Calendar c = Calendar.getInstance();
//设置endDate
Calendar c2 = Calendar.getInstance();
for (int i = 0; i < num; i++) {
HashMap<String, Object> dateMap = new HashMap<String, Object>();
//设置start
//设置为1号,当前日期既为本月第一天
c.set(Calendar.DAY_OF_MONTH,1);
//设置为0点0分0秒
c.set(c.get(c.YEAR), c.get(c.MONTH), c.get(c.DAY_OF_MONTH), 0, 0, 0);
//存入年月显示
dateMap.put("yearMonthStr",format.format(c.getTime()));
dateMap.put("startDate",c.getTime());
//将c 设置为下个月
c.add(c.DATE, -1);
//设置end 为当前月的月底 23时59分59秒
c2.set(Calendar.DAY_OF_MONTH,1);
//设置时间 23时59分59秒
c2.set(c2.get(c.YEAR), c2.get(c.MONTH), c2.get(c.DAY_OF_MONTH), 23, 59, 59);
//获得当前月最后一天
c2.add(Calendar.MONTH, 1);
c2.set(Calendar.DAY_OF_MONTH, 0);
//存入map
dateMap.put("endDate",c2.getTime());
//获取当前时间的下一个月
c2.add(Calendar.MONTH, -1);
//将c2设置为当前时间上一个月
c2.set(c.get(c.YEAR), c.get(c.MONTH), c.get(c.DAY_OF_MONTH));
//放入集合
maps.add(dateMap);
}
}
}
数据格式
[{
endDate = Fri May 31 23: 59: 59 CST 2019,
yearMonthStr = 2019 - 05,
startDate = Wed May 01 00: 00: 00 CST 2019
}, {
endDate = Tue Apr 30 23: 59: 59 CST 2019,
yearMonthStr = 2019 - 04,
startDate = Mon Apr 01 00: 00: 00 CST 2019
}, {
endDate = Sun Mar 31 23: 59: 59 CST 2019,
yearMonthStr = 2019 - 03,
startDate = Fri Mar 01 00: 00: 00 CST 2019
}, {
endDate = Thu Feb 28 23: 59: 59 CST 2019,
yearMonthStr = 2019 - 02,
startDate = Fri Feb 01 00: 00: 00 CST 2019
}, {
endDate = Thu Jan 31 23: 59: 59 CST 2019,
yearMonthStr = 2019 - 01,
startDate = Tue Jan 01 00: 00: 00 CST 2019
}]
