用Java解析JSONArray的JSONArray

Question

我很難解析如下所示的JSONArray：

{ 
  "informations": {
    "rows_nb": 4, //max is 4
    "report": [
      [ [ "BEACH", 59.35 ], [ "OCEAN", 40.65 ] ],//row1 , can be more than 2 arrays
      [ [ "OCEAN", 70.2  ], [ "BEACH", 29.8  ] ],//row2, can be more than 2 arrays
      [ "OCEAN", "BEACH" ],//row3
      [ "OCEAN" ]//row4
    ]
  }
}  

我嘗試了類似的方法，但沒有成功：

JSONObject JSONresult = new JSONObject(result);
JSONObject extras = JSONresult.getJSONObject("extras");
JSONArray report = extras.getJSONArray("report");
List<ArrayList<Object[]>> report_list = new ArrayList<ArrayList<Object[]>>();
for (int i = 0; i < report.length(); i++) {
    JSONArray tmp = report.getJSONArray(i);
    ArrayList<Object[]> row = new ArrayList<Object[]>();
    for (int j = 0; i < tmp.length(); i++) {
        Object[] array = {tmp.getJSONArray(i).getString(0), tmp.getJSONArray(i).getDouble(1)};
        row.add(array);
    }
    report_list.add(row);
}

請幫忙！

Answer 1

您正在使用什么ObjectMapper。 下面是fastxml的示例。

String jsonInString = <your request>;
ObjectMapper mapper = new ObjectMapper();


//JSON from file to Object
User user = mapper.readValue(jsonInString, YourClassName.class);

Answer 2

您可以使用google gson 。 這將自動將JSON轉換為嵌套列表的列表列表。

String json = "{report: [      [ [ BEACH, 59.35 ], [ OCEAN, 40.65 ] ],      [ [ OCEAN, 70.2  ], [ BEACH, 29.8  ] ],      [ OCEAN, BEACH],      [ OCEAN ]    ]}";

Gson gson = new GsonBuilder().create();
Map map = gson.fromJson(json, Map.class);