将List转换为JSON [英] Convert List into JSON

问题描述

我已经在我的Wordpress网站上开发了一个钩子，在那里我可以从另一个应用程序更新信息。我正在使用一个需要特定JSON数据结构的特定插件。我的Java编程技巧有点生疏，所以我希望有人可以帮我拿下列表：

I've developed a hook into my Wordpress site, where I can update information from another application. I'm using a specific plugin that requires a certain JSON data structure. My Java programming skills are a little rusty, so I was hoping someone could help me take the following List:

+------+-------+-----+-------+
| Year | Month | Day | Value |
+------+-------+-----+-------+
| 2014 |    12 |  22 |     1 |
| 2014 |    12 |  23 |     1 |
| 2014 |    12 |  24 |     1 |
| 2014 |    12 |  25 |     1 |
| 2014 |    12 |  26 |     1 |
| 2015 |     1 |   5 |     1 |
| 2015 |     1 |   6 |     1 |
| 2015 |     1 |   7 |     1 |
| 2015 |     1 |   8 |     1 |
| 2015 |     1 |   9 |     1 |
| 2015 |     1 |  19 |     1 |
| 2015 |     1 |  20 |     1 |
| 2015 |     1 |  21 |     1 |
| 2015 |     1 |  22 |     1 |
| 2015 |     1 |  23 |     1 |
| 2015 |     2 |   2 |     1 |
| 2015 |     2 |   3 |     1 |
| 2015 |     2 |   4 |     1 |
| 2015 |     2 |   5 |     1 |
| 2015 |     2 |   6 |     1 |
+------+-------+-----+-------+

并将其转换为以下JSON结构：

and convert it to the following JSON structure:

{
    "2014": {
        "12": {
            "22": "1",
            "23": "1",
            "24": "1",
            "25": "1",
            "26": "1"
        }
    },
    "2015": {
        "1": {
            "5": "1",
            "6": "1",
            "7": "1",
            "8": "1",
            "9": "1",
            "19": "1",
            "20": "1",
            "21": "1",
            "22": "1",
            "23": "1"
        },
        "2": {
            "2": "1",
            "3": "1",
            "4": "1",
            "5": "1",
            "6": "1"
        }
    }
}

非常感谢任何帮助。

编辑

我是创建了以下嵌套映射，但我需要正确的结构来返回指定格式的数据

I've created the follow nested Maps, but I need the correct structure to return the data in the specified format

Map<String, Map<String, Map<String, String>>> map = new HashMap<>();
map.put("2014", new HashMap(){{put("12",new HashMap(){{put("22","1");}});}});
map.put("2014", new HashMap(){{put("12",new HashMap(){{put("23","1");}});}});
map.put("2014", new HashMap(){{put("12",new HashMap(){{put("24","1");}});}});
map.put("2014", new HashMap(){{put("12",new HashMap(){{put("25","1");}});}});
map.put("2014", new HashMap(){{put("12",new HashMap(){{put("26","1");}});}});


JSONObject json = new JSONObject(map);
System.out.print(json.toString());

推荐答案

使用以下内容：

    HashMap<String, HashMap<String, HashMap<String, String>>> map = new HashMap<String, HashMap<String, HashMap<String, String>>>();

    for (int i = 0; i < calendarData.size(); i++) {         

        if (!map.containsKey(calendarData.get(i).getYear())) {
            map.put(calendarData.get(i).getYear(), new HashMap<String, HashMap<String, String>>());
        }

        if (!map.get(calendarData.get(i).getYear()).containsKey(calendarData.get(i).getMonth())) {
            map.get(calendarData.get(i).getYear()).put(calendarData.get(i).getMonth(), new HashMap<String, String>());
        }

        map.get(calendarData.get(i).getYear()).get(calendarData.get(i).getMonth()).put(calendarData.get(i).getDay(), calendarData.get(i).getValue());
    }

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