JAVA Calendar设置周一为第一天

最新推荐文章于 2025-06-05 18:09:56 发布

原创最新推荐文章于 2025-06-05 18:09:56 发布 · 1.1w 阅读

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本文介绍了一个用于处理日期和版本的Java工具类实现，包括获取当前版本信息、计算指定年份的周数以及获取前13周的版本号等功能。

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package com.thinkgem.jeesite.modules.sys.utils;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;

import com.thinkgem.jeesite.modules.sys.entity.DateVersion;


/**
 * 获取当前版本
 * @author jxxt
 *
 */
public class DateVersionUtils {
	private static Integer  WEEKNUM = 13;
	public static DateVersion get(){
		
		DateVersion dv = new DateVersion();
		SimpleDateFormat simdf = new SimpleDateFormat("MM-dd");
		Calendar calendar = Calendar.getInstance(); 
		Calendar c = new GregorianCalendar(); 
	   	c.setFirstDayOfWeek(Calendar.MONDAY); 
	   	c.setMinimalDaysInFirstWeek(7); 
		Date today = new Date();
		c.setTime (today);
		// 获取当前年
		dv.setYear(calendar.get(Calendar.YEAR));

		// 获取当前月
		dv.setMonth(calendar.get(Calendar.MONTH) + 1);
		
		// 获取当前日
		dv.setDay(calendar.get(Calendar.DATE));
		
		// 获取该周当天
		dv.setToday(simdf.format(calendar.getTime()));
		
		// 获取该周周一
		calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
		dv.setMonday(simdf.format(calendar.getTime()));
		
		// 获取该周周末
		calendar.set(Calendar.DATE, calendar.get(Calendar.DATE) + 6);
		dv.setSunday(simdf.format(calendar.getTime()));
		dv.setWeek(c.get(Calendar.WEEK_OF_YEAR));
		if(dv.getWeek() > 51){
			dv.setYear(calendar.get(Calendar.YEAR)-1);
		}
		return dv;
	}
public static DateVersion returnVersion(int num){
		
		DateVersion dv = new DateVersion();
		SimpleDateFormat simdf = new SimpleDateFormat("MM-dd");
		//Calendar calendar = Calendar.getInstance(); 
		Calendar c = new GregorianCalendar(); 
	   	c.setFirstDayOfWeek(Calendar.MONDAY); 
	   	c.setMinimalDaysInFirstWeek(7); 
		@SuppressWarnings("deprecation")
		Date today = new Date(""+num+"/12/31");
		
		// 获取当前年
		dv.setYear(num);

		// 获取当前是第几周
		//calendar.setFirstDayOfWeek(Calendar.MONDAY);  
		System.out.println(today);
		c.setTime (today);
		dv.setWeek(c.get(Calendar.WEEK_OF_YEAR));
		return dv;
	}

	

	 // 获取当前时间所在年的周数
   public static int getWeekOfYear(Date date) {
       Calendar c = new GregorianCalendar();
       c.setFirstDayOfWeek(Calendar.MONDAY);
       c.setMinimalDaysInFirstWeek(1);
       c.setTime(date);

       return c.get(Calendar.WEEK_OF_YEAR);
   }
   // 取前13周的计算方法
   	public static List<String> perv13Week(){
   		String currentVersion = DateVersionUtils.get().getCurrentVersion();
   		String[] split = currentVersion.split("-");
   		List list = new ArrayList();
   		Integer valueOf = Integer.valueOf(split[1]);
   		// 如果周大于13
   		if( valueOf >=  WEEKNUM) {
   			list.add(split[0]+""+split[1]);
   			for(int i=1; i< WEEKNUM; i++){
   				if(valueOf > 10){
   					list.add(split[0]+""+(--valueOf));
   				} else {
   					list.add(split[0]+"0"+(--valueOf));
   				}
   			}
   		} else {
   			// 取得当前周和13的差
   			int s= WEEKNUM-valueOf;
   			int num = valueOf;
   			list.add(split[0]+"0"+split[1]);
   			for(int i=1; i< num; i++){
   				if(valueOf > 10){
   					list.add(split[0]+""+(--valueOf));	
   				} else {
   					list.add(split[0]+"0"+(--valueOf));
   				}
   			}
   			Integer years = Integer.valueOf(split[0]);
   			--years;
   			DateVersion returnVersion = returnVersion(years);
   			String currentVersion2 = returnVersion.getCurrentVersion();
   			String[] split2 = currentVersion2.split("-");
   			Integer valueOf1 = Integer.valueOf(split2[1]);
   			list.add(split2[0]+""+(valueOf1));	
   			for(int a=1; a<s; a++){
   				list.add(split2[0]+""+(--valueOf1));	
   			}
   		}
   		return list;
   	}
   	public static int getDayOfWeek(String dateString){  
   	    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");  
   	    try {  
   	        Date date = format.parse(dateString);  
   	        Calendar cal = Calendar.getInstance();  
   	        cal.setTime(date);  
   	        cal.setFirstDayOfWeek(Calendar.MONDAY);  
   	        int tmp = cal.get(Calendar.DAY_OF_WEEK) - 1;  
   	        if (0 == tmp) {  
   	            tmp = 7;  
   	        }  
   	        return tmp;  
   	    } catch (Exception e) {  
   	        e.printStackTrace();  
   	        return -1;  
   	    }  
   	}  
  
   		public static void main(String[] args) {
   			String currentVersion = DateVersionUtils.get().getCurrentVersion();
   			System.out.println("sdf:"+currentVersion);
//   			System.out.print(DateVersionUtils.get().getCurrentVersion());
   			List<String> perv13Week = DateVersionUtils.perv13Week();
   			System.out.println(perv13Week);
 
		}
}