获取周数据，每周第一天和最后一天，前几周

阿闰

已于 2022-10-14 18:31:48 修改

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CC 4.0 BY-SA版权

文章标签： java mybatis servlet

于 2022-10-14 18:31:09 首次发布

本文链接：https://blog.youkuaiyun.com/wasd986523/article/details/127325736

本文介绍了一个实用的Java工具类，用于获取指定日期所在周的第一天和最后一天，并通过示例展示了如何利用该工具类来获取过去五周的具体日期范围。

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package com.jzlife;

import java.time.*;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;

import com.jzlife.report.util.DateUtil;
import com.jzlife.report.util.JsonUtil;

/**
 * @author lurz
 */
public class WeekUtil {

	public static Date getFirstDayOfWeek(Date date) {
		Calendar cal = Calendar.getInstance();
		try {
			cal.setTime(date);
			cal.set(Calendar.DAY_OF_WEEK, 2);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return cal.getTime();
	}

	public static Date getLastDayOfWeek(Date date) {
		Calendar cal = Calendar.getInstance();
		try {
			cal.setTime(date);
			cal.set(Calendar.DAY_OF_WEEK, 2);
			cal.set(Calendar.DATE, cal.get(Calendar.DATE) + 6);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return cal.getTime();
	}

	public static void main(String[] args) {

//    	Date firstDayOfWeek = getFirstDayOfWeek(new Date());
//    	Date lastDayOfWeek = getLastDayOfWeek(new Date());
//    	
//        System.out.println(getFirstDayOfWeek(new Date()));
//        System.out.println(getLastDayOfWeek(new Date()));
//        System.out.println(DateUtil.addDay(firstDayOfWeek, -7));

//        System.out.println("当前季度为"+quarter+"季度");
//        System.out.println((c.get(c.MONTH)+1)+"--"+c.get(c.DATE));

		List<Map<String, Object>> ls=new ArrayList<Map<String,Object>>();
		Date d = new Date();
		for (int i = 0; i < 5; i++) {
			Date firstDayOfWeek = getFirstDayOfWeek(d);
			Date lastDayOfWeek = getLastDayOfWeek(d);
			String monthWeek = getMonthWeek(DateUtil.addDay(d, 1));
			d=DateUtil.addDay(d, -7);

			List<String> list = new ArrayList<String>();
			list.add(DateUtil.dateToString(firstDayOfWeek));
			list.add(DateUtil.dateToString(lastDayOfWeek));
			Map<String, Object> m=new HashMap<String, Object>();
			m.put(monthWeek, list);
			ls.add(m);
		}
		System.out.println(JsonUtil.getJson(ls));
	}

	private static String getMonthWeek(Date dd) {
		Calendar c = Calendar.getInstance();
		c.setTime(dd);
//		Calendar c = Calendar.getInstance();
//        c.add(Calendar.DATE,18); //增加一天
		int month = c.get(c.WEEK_OF_MONTH);
		int week = c.get(c.WEEK_OF_YEAR);
		String quarter = "";
		int m = c.get(c.MONTH);
		if (m >= 1 && m == 3) {
			quarter = "1";
		} else if (m >= 4 && m <= 6) {
			quarter = "2";
		} else if (m >= 7 && m <= 9) {
			quarter = "3";
		} else {
			quarter = "4";
		}
//        System.out.println("今天是今年的第" + week + "周;");
//        System.out.println((c.get(c.MONTH)+1)+"月第" + month + "周;");
		return (c.get(c.MONTH) + 1) + "月第" + month + "周;";
	}

}

[{"10月第3周;":["2022-10-10","2022-10-16"]},{"10月第2周;":["2022-10-03","2022-10-09"]},{"10月第1周;":["2022-09-26","2022-10-02"]},{"9月第4周;":["2022-09-19","2022-09-25"]},{"9月第3周;":["2022-09-12","2022-09-18"]}]