如何访问二维json数组？答案

【问题标题】：How to access two dimension json array?如何访问二维json数组？
【发布时间】：2017-11-29 14:59:58
【问题描述】：

我正在使用 java 我进口了

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

假设我有“freeBaggageAvailable”

 "freeBaggageAvailable" : [
    {
        "Y" : [{
                "*" : [{"num":1,"weight": 23,"price": 0}],
               "mc" : [{"num:":1,"weight" : 23,"price": 0}, {"num":2, "weight": 23,"price": 0}],
               "mp" : [{"num:":1,"weight" : 23,"price": 0}, {"num":2, "weight": 23,"price": 0}],
               "mmc" :[{"num:":1,"weight" : 23,"price": 0}, {"num":2, "weight": 32,"price": 0}]
              }],
         "C" : [{
                "*" : [{"num":1,"weight":32 ,"price": 0},{"num":1,"weight":32 ,"price": 0}],
               "mc" : [{"num:":1,"weight" : 32,"price": 0}, {"num":2, "weight": 32,"price": 0},{"num":3,"weight":32 ,"price": 0}],
               "mp" : [{"num:":1,"weight" : 32,"price": 0}, {"num":2, "weight": 32,"price": 0},{"num":3,"weight":32 ,"price": 0}],
               "mmc" :[{"num:":1,"weight" : 23,"price": 0}, {"num":2, "weight": 32,"price": 0}]
              }],

          "F" : [{
                "*" : [{"num":1,"weight":32 ,"price": 0},{"num":1,"weight":32 ,"price": 0}],
               "mc" : [{"num:":1,"weight" : 32,"price": 0}, {"num":2, "weight": 32,"price": 0},{"num":3,"weight":32 ,"price": 0},{"num":4,"weight":32 ,"price": 0}],
               "mp" : [{"num:":1,"weight" : 32,"price": 0}, {"num":2, "weight": 32,"price": 0},{"num":3,"weight":32 ,"price": 0},{"num":4,"weight":32 ,"price": 0}],
               "mmc" :[{"num:":1,"weight" : 23,"price": 0}, {"num":2, "weight": 32,"price": 0},{"num":4,"weight":32 ,"price": 0}]
              }]}
     ],

如果我想访问数据 "Y" -> "mc" -> "num"
如何从 JsonObject 访问它

 File file = new File(classLoader.getResource("files/BaggageInfoPolicy.json").getFile());

        Object obj = parser.parse(new FileReader(file));
        JSONObject jsonObject = (JSONObject) obj;

【问题讨论】：

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标签： java json jsonparser

【解决方案1】：

在 JSON.org 参考实现中，您可以这样做：

for (String key : JSONObject.getNames(jsonObject))
{
    map.put(key, jsonObject.get(key));
}

在简单的 JSON 中，你会这样做：

for (Object keyObject : jsonObject.keySet())
{
    String key = (String)keyObject;
    map.put(key, (String)jsonObject.get(key));
}

【讨论】：