java 获取两个日期之间的所有周四，并计算每个周四在当月属于第几周

落日映苍穹つ 2022-03-11 06:54 570阅读 0赞

最近的任务很多都要计算时间，写了很多关于计算日期的，希望可以帮助有需要的人。

import java.text.DateFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.List;
    
    /**
     * 
     * 获取两个日期之间的所有周四 并计算每个周四在当月是第几周
     * @author lzw
     * @Date 2019年3月6日
     */
    public class demo3 {
    
    	/**
    	 * @param args
    	 * @throws Exception 
    	 */
    	public static void main(String[] args) throws Exception {
    		List<String> test = getWeekly();
    		
    		System.err.println(test);
    
    	}
    
    
    	public static boolean thursdayOrNot(String str) throws ParseException{
    		DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    		Date date = sdf.parse(str);
    		SimpleDateFormat dateFm = new SimpleDateFormat("EEEE");
    		String currSun = dateFm.format(date);
    		if (currSun.equals("星期四")) {
    			return true;
    		}
    		return false;
    	}
    	
    
    	public static String getWeek(Date date) throws Exception {
    		Calendar calendar = Calendar.getInstance();
    		calendar.setTime(date);
    		DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    		String format = sdf.format(date);
    		String substring = format.substring(0, 7);
    		int number = calendar.get(Calendar.WEEK_OF_MONTH);
    		String week = substring + "-0" + number;
    		return week;
    	}
    	public static List<String> getWeekly() throws Exception{
    		List<String> list = findDates("2019-02-01", "2019-03-31");
    		List<String> thursdayList = new ArrayList<>();
    		for (String string : list) {
    			boolean thursday = thursdayOrNot(string);
    			if (thursday==true) {
    				thursdayList.add(string);
    			}
    			
    		}
    		DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    		List<String> weekList = new ArrayList<>();
    		for (String str : thursdayList) {
    			Date date = sdf.parse(str);
    			String week = getWeek(date);
    			weekList.add(week);
    		}
    		return weekList;
    	}
    	
    	public static List<String> findDates(String dBegin, String dEnd) throws ParseException {
    		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar calBegin = Calendar.getInstance();
    		calBegin.setTime(format.parse(dBegin));
    		Calendar calEnd = Calendar.getInstance();
    		calEnd.setTime(format.parse(dEnd));
    		List<String> Datelist = new ArrayList<String>();
    		while (format.parse(dEnd).after(calBegin.getTime())) {
    			calBegin.add(Calendar.DAY_OF_MONTH, 1);
    			Datelist.add(format.format(calBegin.getTime()));
    		}
    		Datelist.add(dBegin);
    		return Datelist;
    	}
    
    }

获取两个时间段之间的周五，并判断他的周次

public static List<String> getAllWeekly2(String startDate, String endDate) throws Exception {
    
    		// 获取两个日期之间的所有日期
    		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar calBegin = Calendar.getInstance();
    		calBegin.setTime(format.parse(startDate));
    		Calendar calEnd = Calendar.getInstance();
    		calEnd.setTime(format.parse(endDate));
    		List<String> Datelist = new ArrayList<String>();
    		Datelist.add(startDate);
    		while (format.parse(endDate).after(calBegin.getTime())) {
    			calBegin.add(Calendar.DAY_OF_MONTH, 1);
    			Date date = calBegin.getTime();
    			SimpleDateFormat dateFm = new SimpleDateFormat("EEEE");
    			String currSun = dateFm.format(date);
    			if (currSun.equals("星期五")) {
    				Calendar calendar = Calendar.getInstance();
    				calendar.setTime(date);
    				DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    				String format1 = sdf.format(date);
    				String substring = format1.substring(0, 7);
    				int number = calendar.get(Calendar.WEEK_OF_MONTH);
    				String week = substring + "-0" + number;
    				Datelist.add(week);
    			}
    		}
    
    		return Datelist;
    	}