java获取指定月份中每天时间列表

Posted 2022-12-12 xiejunna

获取一个月中每一天的时间列表

public static List<String> getDayListOfMonth(String yyyymm) 
    	
    	if (yyyymm.length() != 6) 
			return null;
		
    	
    	List<String> list = new ArrayList<String>();
    	String ystr = yyyymm.substring(0, 4);
    	String mstr = yyyymm.substring(4,6);
        
        Calendar a = Calendar.getInstance();
        a.set(Calendar.YEAR, Integer.parseInt(ystr));//年份
        a.set(Calendar.MONTH,Integer.parseInt(mstr) - 1);//月份
        a.set(Calendar.DATE, 1);
        a.roll(Calendar.DATE, -1);
        
        int maxDate = a.get(Calendar.DATE);
        
        for (int i = 0; i < maxDate; i++) 
        	int d = i+1;
        	String dstr = "";
        	if (d < 10) 
				dstr = "0"+String.valueOf(d);
			else 
				dstr = String.valueOf(d);
			
        	String day = ystr + mstr + dstr;
			list.add(day);
		
        
        return list;
    

测试：

public static void main(String args[])
    	
    	System.out.println(getDayListOfMonth("202202"));
        

输出结果：

[20220201, 20220202, 20220203, 20220204, 20220205, 20220206, 20220207, 20220208, 20220209, 20220210, 20220211, 20220212, 20220213, 20220214, 20220215, 20220216, 20220217, 20220218, 20220219, 20220220, 20220221, 20220222, 20220223, 20220224, 20220225, 20220226, 20220227, 20220228]