JAVA通过某年的几周获取该周的开始时间和结束时间

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本文介绍了一个用于计算给定年份和周数的起始和结束日期的Java类。该类提供了获取指定月份的第一天、最后一天以及给定周数的起始和结束日期的功能。

这个代码在网上找的。

package com.oce.tsm.ui.sim.banKpi.utils;

import java.util.Calendar;

public class WeekUtils {
	    
	    public static void main(String[] args) {
	        
	    	WeekUtils cd = new WeekUtils();
	        System.out.println("开始时间: " + cd.getStartDayOfWeekNo(2015,47) );
	        System.out.println("结束时间:" + cd.getEndDayOfWeekNo(2015,47) );    
	        
	    }
	    
	    /**
	     * get first date of given month and year
	     * @param year
	     * @param month
	     * @return
	     */
	    public 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 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 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 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 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);    
	    }
	}