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; } }
