java获取一年的周数、单周开始时间与结束时间、一年所有周开始时间与结束时间、月开始时间与结束时间
package com.frgk.produce.util;import org.springframework.util.CollectionUtils;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;public class YearWeeksUtil {public static void main(String[] args) {String endtime = getYearEnd();System.out.println(endtime);//String currentYear = getCurrentYear();//getWeekRangeMap(2021,53);//getYearWeekMap(2021);String retval = getMonthStart(2021,2);System.out.println(retval);retval = getMonthEnd(2021,2);System.out.println(retval);}/*** 获取当前年* @return*/private static String getCurrentYear() {Calendar calendar = Calendar.getInstance();int weekYear = calendar.get(Calendar.YEAR);//获得当前的年return weekYear+"";}/*** 获取今天* @return String* */public static String getToday(){return new SimpleDateFormat("yyyy-MM-dd").format(new Date());}/*** 获取昨天* @return String* */public static String getYestoday(){Calendar cal=Calendar.getInstance();cal.add(Calendar.DATE,-1);Date time=cal.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(time);}/*** 获取本月开始日期* @return String* **/public static String getMonthStart(){Calendar cal=Calendar.getInstance();cal.add(Calendar.MONTH, 0);cal.set(Calendar.DAY_OF_MONTH, 1);Date time=cal.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(time)+" 00:00:00";}/*** 获取某年某月开始日期* @return String* **/public static String getMonthStart(int year,int month){Calendar cal=Calendar.getInstance();cal.set(Calendar.YEAR, year);cal.set(Calendar.MONTH, month-1);cal.set(Calendar.DAY_OF_MONTH, 1);Date time=cal.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(time)+" 00:00:00";}/*** 获取本月最后一天* @return String* **/public static String getMonthEnd(){Calendar cal=Calendar.getInstance();cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));Date time=cal.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(time)+" 23:59:59";}/*** 获取某年某月最后一天* @return String* **/public static String getMonthEnd(int year,int month){Calendar cal=Calendar.getInstance();cal.set(Calendar.YEAR, year);cal.set(Calendar.MONTH, month-1);cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));Date time=cal.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(time)+" 23:59:59";}/*** 获取本周的第一天* @return String* **/public static String getWeekStart(){Calendar cal=Calendar.getInstance();cal.add(Calendar.WEEK_OF_MONTH, 0);cal.set(Calendar.DAY_OF_WEEK, 2);Date time=cal.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(time)+" 00:00:00";}/*** 获取本周的最后一天* @return String* **/public static String getWeekEnd(){Calendar cal=Calendar.getInstance();cal.set(Calendar.DAY_OF_WEEK, cal.getActualMaximum(Calendar.DAY_OF_WEEK));cal.add(Calendar.DAY_OF_WEEK, 1);Date time=cal.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(time)+" 23:59:59";}/*** 获取本年的第一天* @return String* **/public static String getYearStart(){return new SimpleDateFormat("yyyy").format(new Date())+"-01-01 00:00:00";}/*** 获取某年的第一天* @return String* **/public static String getYearStart(int year){return year+"-01-01 00:00:00";}/*** 获取本年的最后一天* @return String* **/public static String getYearEnd(){Calendar calendar = Calendar.getInstance();calendar.set(Calendar.MONTH,calendar.getActualMaximum(Calendar.MONTH));calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));Date currYearLast = calendar.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(currYearLast)+" 23:59:59";}/*** 获取某年的最后一天* @return String* **/public static String getYearEnd(int year){Calendar calendar = Calendar.getInstance();calendar.set(Calendar.YEAR,year);calendar.set(Calendar.MONTH,calendar.getActualMaximum(Calendar.MONTH));calendar.set(Calendar.DAY_OF_MONTH,calendar.getActualMaximum(Calendar.DAY_OF_MONTH));Date currYearLast = calendar.getTime();return new SimpleDateFormat("yyyy-MM-dd").format(currYearLast)+" 23:59:59";}/*** 获取某年某周的时间跨度* @param year* @param week* @return*/public static Map<String, String> getWeekRangeMap(int year, int week) {Map<String, String> timeMap = new HashMap<String, String>();Calendar calendar = Calendar.getInstance();calendar.set(Calendar.YEAR,year);calendar.setFirstDayOfWeek(Calendar.MONDAY);//设置星期一为一周开始的第一天calendar.setMinimalDaysInFirstWeek(4);//可以不用设置int weekYear = calendar.get(Calendar.YEAR);//获得当前的年calendar.setWeekDate(weekYear, week, 2);//获得指定年的第几周的开始日期Date time=calendar.getTime();String startTime = new SimpleDateFormat("yyyy-MM-dd").format(time)+" 00:00:00";timeMap.put("startTime",startTime);calendar.setWeekDate(weekYear, week, 1);//获得指定年的第几周的结束日期time=calendar.getTime();String endTime = new SimpleDateFormat("yyyy-MM-dd").format(time)+" 23:59:59";timeMap.put("endTime",endTime);return timeMap;}/*** 获取某年有多少周* @param year* @return* @throws ParseException*/public static int getYearWeekConut(int year){int week = 52;try {/*Calendar calendar = Calendar.getInstance();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");calendar.setFirstDayOfWeek(Calendar.MONDAY);//设置星期一为一周开始的第一天calendar.set(year, Calendar.DECEMBER, 31, 23, 59, 59);week = calendar.get(Calendar.WEEK_OF_YEAR);*/Map<String, String> timeMap = getWeekRangeMap(year,53);if(CollectionUtils.isEmpty(timeMap)){String startTime = timeMap.get("startTime");if(startTime.substring(0, 4).equals(year+"")){ //判断年度是否相符，如果相符说明有53个周。week = 53;}}} catch (Exception e) {e.printStackTrace();}return week;}/*** 获取某年所有周的时间跨度* @param year* @return*/public static Map<String, Map<String, String>> getYearWeekMap(int year) {int weeks = getYearWeekConut(year);Map<String, Map<String, String>> yearWeekMap = new HashMap<String, Map<String, String>>();for (int i =1;i<=weeks;i++){Map<String, String> timeMap = getWeekRangeMap(year,i);yearWeekMap.put(i+"",timeMap);}return yearWeekMap;}
}