在Java中无法访问getJSONArray

问题描述

我有此JSON从网址：

I have this Json from URL:

{
  "type":"FeatureCollection",
  "features":
    [
      {
        "type":"Feature",
        "properties":
          [
            {
              "type":"colliers",
              "thumb":"upload\/estate\/135\/thumb_1. Prologis Park Wroclaw I.jpg",
              "name_pl":"Prologis Park Wroc\u0142aw I",
              "name_en":"Prologis Park Wroc\u0142aw I",
              "completearea":"167 000",
              "completeareaunit":"m2",
              "workingarea":"",
              "workingareaunit":"m2",
              "id_type":"3",
              "id":"135",
              "lon":16.939201369628,
              "lat":51.037378299619,
              "images":["public\/upload\/estate\/135\/1. Prologis Park Wroclaw I.jpg"]
            }
          ],
        "geometry":
          {
            "type":"Point",
            "coordinates":[16.939201369628,51.037378299619]
          },
        "crs":
          {
            "type":"name",
            "properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}
          }
        },

      {
        "type":"Feature",
        "properties":
          [
            {
              "type":"colliers",
              "thumb":"upload\/estate\/136\/thumb_2. Prologis Park Wroclaw III.jpg",
              "name_pl":"Prologis Park Wroc\u0142aw III",
              "name_en":"Prologis Park Wroclaw III",
              "completearea":"129 500",
              "completeareaunit":"m2",
              "workingarea":"",
              "workingareaunit":"m2",
              "id_type":"3",
              "id":"136",
              "lon":16.928386702881,
              "lat":51.105440250407,
              "images":
                [
                  "public\/upload\/estate\/136\/2. Prologis Park Wroclaw III.jpg"
                ]
            }
          ],
        "geometry":
          {
            "type":"Point",
            "coordinates":[16.928386702881,51.105440250407]
          },
        "crs":
          {
            "type":"name",
            "properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}
          }
        },
        .................... more more more...

我需要把我的手的属性列表中。

I need to put my hands on properties in a list.

因此​​，这将是功能 - >属性 - > name_en（就像对象列表）

So it would be features -> properties -> name_en (list of objects like that)

我试试这个：

JSONParser parser = new JSONParser();
Object obj = parser.parse(Json_str);
JSONObject jsonObject = (JSONObject) obj;
JSONArray jsonFeaturesArr = new JSONArray(jsonObject.getJSONArray("features"));

为了创建第一个JSON数组，但我甚至无法做到这一点。我得到的错误：
该方法getJSONArray（字符串）是未定义的类型的JSONObject

in order to create first Json Array, but I can't even do that. I get error:The method getJSONArray(String) is undefined for the type JSONObject

（我有同样的错误getJSONObject）。 STH必须失去了，我是一个Java / Android的新手。

(I have the same error for "getJSONObject"). Sth must be missing, I'm a java/android Newbie.

如果我解决错误我怎么去深入的Json？

If I solve error how do I go deeper into Json?

感谢名单提前帮助。

推荐答案

尝试为：

JSONObject jSONObject = new JSONObject(jsonString);
String str_type=jSONObject.getString("type");

// using JSONArray
JSONArray featuresArr = jSONObject.getJSONArray("features");
  for (int i=0; i<featuresArr.length; i++){
    JSONObject anotherjsonObject = featuresArr.getJSONObject(i);
    //access the fields of that json object
    String str_type_one=anotherjsonObject.getString("type");
   JSONArray featuresArr_properties = anotherjsonObject.getJSONArray("properties");

   JSONObject propertiesjsonObject = featuresArr_properties.getJSONObject(0);
   String str_type=propertiesjsonObject.getString("type");
   String str_type=propertiesjsonObject.getString("thumb");
   String str_type=propertiesjsonObject.getString("name_pl");
   String str_type=propertiesjsonObject.getString("name_en");
 ////parse all items ...........
  }

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