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JAVA 获取一段时间内日期 每一天的所属年，所属月，所属周 并生成结构化的map （注：统一以比较日期所在周的周三获取，年、月、周）

郑建华
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0109
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    现需要，获取一年内的全部日期，并且以上图的方式生成表格。表格内容包括，月、周，并且鼠标移动到每周的格子中时，需要高亮显示竖线，并且显示日期。以每周的周三为准，确定日期的所属周和所属月。比如2020年1月，第五周的周三属于第五周，第五周的周三属于1月。

image.png

    实现思路：

    结构化的数据是需要循环生成map的，循环的前提是有个集合来进行遍历。而已有的条件只有一个开始时间和结束时间，需要先根据两个时间生成一个可用于遍历的拥有完整数据的集合。

    1、根据开始时间，结束时间，递归调用。从开始时间开始，获取当前时间所在周的周三的所属年，所属月，所属周等属性，放入集合中。再将日期增加一天，直到日期与结束时间相等结束递归调用，生成一个完整数据的List集合。

    2、由于时间段可能跨年，所以先遍历数据，根据年份拆分，生成年份map，每个年份一个List集合。

    3、遍历年份map，再遍历年份map的list集合，根据月份拆分，生成月份map，每个月份一个List集合。

    4、遍历月份map，再遍历月份map的list集合，根据周拆分，生成周map，每个周一个List集合。

    5、在遍历的过程中，将周map嵌套到月份map2中。

    6、在遍历的过程中，将月份map2嵌套到年份map2中。

    7、返回年份map2为最终结果


代码：（其中的日期处理工具类，参考《JAVA 时间日期工具方法收藏 持续更新》的工具类一）

	/**
	 * 
	 * <p>根据开始日期，结束日期，获取当前时间段内的日期List结构
	 * 最外层List表示月
	 * 第二层List表示周
	 * 第三层List表示日
	 * @param starttime
	 * @param endtime
	 * @return 
	 * @return List<List<List<Map<String,Object>>>>    
	 * author: zhengjianhua
	 */
	public static Map<String,Object> getDateList(String starttime,String endtime){
		
		//从开始日期开始遍历，加一天比较是否是结束日期，不是则继续，是则结束遍历 获取List日期map
		List<Map<String,Object>> dayList=circulationDate(starttime, endtime, null);

		//遍历list生成结构化数据
	
		//年份map数据
		Map<String,List<Map<String,Object>>> yearMap=new HashMap<String,List<Map<String,Object>>>();		
		
		//年份map2 用于接收处理后的数据
		Map<String,Object> yearMap2=new HashMap<String,Object>();
				
		//1、先根据年份拆分
		if(CollectionUtils.isNotEmpty(dayList)){
			for (Map<String, Object> map : dayList) {
				//年份
				String year=map.get("year")==null?"":String.valueOf(map.get("year"));
				//是否包含年份map
				if(yearMap.containsKey(year)){
					//年份map的元素
					List<Map<String,Object>> tempList=yearMap.get(year);
					//添加到集合中
					tempList.add(map);
				}else{
					//创建list
					List<Map<String,Object>> tempList=new ArrayList<Map<String,Object>>();
					//添加到集合中
					tempList.add(map);
					//添加到map中
					yearMap.put(year, tempList);
				}
			}
		}
		
		//2、遍历年份map 根据月份拆分
		if(MapUtils.isNotEmpty(yearMap)){
			//遍历键值对
			for(Entry<String, List<Map<String, Object>>> entry:yearMap.entrySet()){
				//当前年份的dayList集合
				List<Map<String,Object>> yearDayList=entry.getValue();
				
				//月份map数据
				Map<String,List<Map<String,Object>>> monthMap=new HashMap<String,List<Map<String,Object>>>();		
				
				//月份map数据2 用于接收处理后的数据
				Map<String,Object> monthMap2=new HashMap<String,Object>();
				
				if(CollectionUtils.isNotEmpty(yearDayList)){
					for (Map<String, Object> map : yearDayList) {
						//月份
						String month=map.get("month")==null?"":String.valueOf(map.get("month"));
						//是否包含月份map
						if(monthMap.containsKey(month)){
							//月份map的元素
							List<Map<String,Object>> tempList=monthMap.get(month);
							//添加到集合中
							tempList.add(map);
						}else{
							//创建list
							List<Map<String,Object>> tempList=new ArrayList<Map<String,Object>>();
							//添加到集合中
							tempList.add(map);
							//添加到map中
							monthMap.put(month, tempList);
						}
					}
				}
				
				
				//3、遍历月份map
				if(MapUtils.isNotEmpty(monthMap)){
					//遍历键值对
					for(Entry<String, List<Map<String, Object>>> entry1:monthMap.entrySet()){
						//周map数据
						Map<String,List<Map<String,Object>>> weekMap=new HashMap<String,List<Map<String,Object>>>();		
						//当前月份的dayList集合
						List<Map<String,Object>> monthDayList=entry1.getValue();
						if(CollectionUtils.isNotEmpty(monthDayList)){
							for (Map<String, Object> map2 : monthDayList) {
								//周数
								String week=map2.get("week")==null?"":String.valueOf(map2.get("week"));
								//是否包含周map
								if(weekMap.containsKey(week)){
									//周map的元素
									List<Map<String,Object>> tempList=weekMap.get(week);
									//添加到集合中
									tempList.add(map2);
								}else{
									//创建list
									List<Map<String,Object>> tempList=new ArrayList<Map<String,Object>>();
									//添加到集合中
									tempList.add(map2);
									//添加到map中
									weekMap.put(week, tempList);
								}
							}
						}
						
						//月份map嵌套 周map
						monthMap2.put(entry1.getKey(), weekMap);
					}
				}
				
				//年份map 嵌套月份map
				yearMap2.put(entry.getKey(), monthMap2);
			}
		}
		
		return yearMap2;
	}
	
	
	public static List<Map<String,Object>> circulationDate(String starttime,String endtime,List<Map<String,Object>> dayList){
		Map<String,Object> dayMap=new HashMap<String,Object>();
		//开始日期
		Date starttimeDate=DateUtils.parse(starttime);
		 //获取当前日期所在周的周三 根据周三的日期 来判定是当年的第几周,几月,哪年
         Calendar cal = Calendar.getInstance();  
         cal.setTime(starttimeDate);  
         // 判断要计算的日期是否是周日，如果是则减一天计算周六的，否则会出问题，计算到下一周去了  
         int dayWeek = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天  
         if (1 == dayWeek) {  
             cal.add(Calendar.DAY_OF_MONTH, -1);  
         }  
         cal.setMinimalDaysInFirstWeek(4);//设置一年内第一周至少需要多少天，设置4天，表示第一个周三算在第一周
         cal.setFirstDayOfWeek(Calendar.MONDAY);// 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一  
         int day = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天  
         cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);// 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值  
         cal.add(Calendar.DATE, 2);//周三的日期
         int month=cal.get(Calendar.MONTH);//周三日期所属的月份
         int weekYear = cal.get(Calendar.YEAR);//获得当前的年
         int weekOfYear = cal.get(Calendar.WEEK_OF_YEAR);//获得当前日期属于今年的第几周
         
         
         //所属年
         dayMap.put("year", weekYear);
         //所属月
         dayMap.put("month", month+1);
		 //所属周
         dayMap.put("week", weekOfYear);
         //所属日期
         dayMap.put("day", starttime);
         if(CollectionUtils.isEmpty(dayList)){
        	 //创建集合
        	 dayList=new ArrayList<Map<String,Object>>();
         }
         //添加到集合中
    	 dayList.add(dayMap);
		//开始时间与结束时间不相等
		if(!starttime.equals(endtime)){
			
			 //开始日期加一天
			 String addOneDateString=DateUtils.getFormatDateAdd(starttimeDate, 1, DateUtils.DATE_YY_MM_DD);
			 //调用自身方法递归
			 dayList=circulationDate(addOneDateString, endtime,dayList);
		}
		return dayList;
	}

测试代码：

	public static void main(String[] args) {
		
		Map<String,Object> yearMap=getDateList("2019-12-01","2020-08-01");
		
		System.out.println(JSONObject.toJSON(yearMap));
	}

运行结果：

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