获取某一年指定自然周的开始时间和结束时间
package com.playmath.playmathcrm.util;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;/*** Created by gailun on /8/11.*/public class WeekUtils {public static void main(String[] args) throws ParseException {WeekUtils cd = new WeekUtils();System.out.println("开始时间: " + cd.getStartDayOfWeekNo(,32) );System.out.println("结束时间:" + cd.getEndDayOfWeekNo(,32) );String startDayOfWeekNo = cd.getStartDayOfWeekNo(, 32);SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");System.out.println(sdf.parse(startDayOfWeekNo));System.out.println(sdf.format(sdf.parse(startDayOfWeekNo)));}/*** get first date of given month and year* @param year* @param month* @return*/public static String getFirstDayOfMonth(int year,int month){String monthStr = month < 10 ? "0" + month : String.valueOf(month);return year + "-"+monthStr+"-" +"01";}/*** get the last date of given month and year* @param year* @param month* @return*/public static String getLastDayOfMonth(int year,int month){Calendar calendar = Calendar.getInstance();calendar.set(Calendar.YEAR , year);calendar.set(Calendar.MONTH , month - 1);calendar.set(Calendar.DATE , 1);calendar.add(Calendar.MONTH, 1);calendar.add(Calendar.DAY_OF_YEAR , -1);return calendar.get(Calendar.YEAR) + "-" + (calendar.get(Calendar.MONTH) + 1) + "-" +calendar.get(Calendar.DAY_OF_MONTH);}/*** get Calendar of given year* @param year* @return*/private static Calendar getCalendarFormYear(int year){Calendar cal = Calendar.getInstance();cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);cal.set(Calendar.YEAR, year);return cal;}/*** get start date of given week no of a year* @param year* @param weekNo* @return*/public static String getStartDayOfWeekNo(int year,int weekNo){Calendar cal = getCalendarFormYear(year);cal.set(Calendar.WEEK_OF_YEAR, weekNo);return cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +cal.get(Calendar.DAY_OF_MONTH);}/*** get the end day of given week no of a year.* @param year* @param weekNo* @return*/public static String getEndDayOfWeekNo(int year,int weekNo){Calendar cal = getCalendarFormYear(year);cal.set(Calendar.WEEK_OF_YEAR, weekNo);cal.add(Calendar.DAY_OF_WEEK, 6);return cal.get(Calendar.YEAR) + "-" + (cal.get(Calendar.MONTH) + 1) + "-" +cal.get(Calendar.DAY_OF_MONTH);}}
执行结果:
