使用GSon进行嵌套Json解析

Question

如何用google Gson解析下面的Json响应？

{
   "rootobject":[
      {
         "id":"7",
         "name":"PP-1",
         "subtitle":"name-I",
         "key1":"punjab",
         "key12":"2013",
         "location":"",
         "key13":"0",
         "key14":"0",
         "key15":"0",
         "result_status":null
      },
      {
         "id":"7",
         "name":"PP-1",
         "subtitle":"name-I",
         "key1":"punjab",
         "key12":"2013",
         "location":"",
         "key13":"0",
         "key14":"0",
         "key15":"0",
         "result_status":null
      },
      {
         "id":"7",
         "name":"PP-1",
         "subtitle":"name-I",
         "key1":"punjab",
         "key12":"2013",
         "location":"",
         "key13":"0",
         "key14":"0",
         "key15":"0",
         "result_status":null
      },
      {
         "id":"7",
         "name":"PP-1",
         "subtitle":"name-I",
         "key1":"punjab",
         "key12":"2013",
         "location":"",
         "key13":"0",
         "key14":"0",
         "key15":"0",
         "result_status":null
      }
   ]
}

Answer 1

我会创建对象来“包装”响应，比如：

public class Response {

  @SerializedName("root_object")
  private List<YourObject> rootObject;

  //getter and setter
}


public class YourObject {

  @SerializedName("id")
  private String id;
  @SerializedName("name")
  private String name;
  @SerializedName("subtitle")
  private String subtitle;
  //... other fields

  //getters and setters
}

注意:使用@SerializedName注释遵循Java属性中的命名约定，同时匹配JSON数据中的名称。

然后，您只需使用Reponse对象解析JSON，如下所示：

String jsonString = "your json data...";
Gson gson = new Gson();
Response response = gson.fromJson(jsonString, Response.class);

现在，您可以使用getter和setter访问Response对象中的所有数据。

注意:您的Response对象可用于解析不同的JSON响应。例如，您可以使用不包含id或subtitle字段的JSON响应，但是您的Reponse对象也将解析该响应，并且只需在这些字段中添加一个null。这样，您就可以只使用一个Response类来解析所有可能的响应……

编辑:我没有意识到Android标签，我在通常的Java程序中使用这种方法，我不确定它是否适用于Android……

Answer 2

你可以试试这个，希望这能行得通

 // Getting Array 
JSONArray contacts = json.getJSONArray("rootobject");
SampleClass[] sample=new SampleClass[contacts.length]();

    // looping through All 
    for(int i = 0; i < contacts.length(); i++){
        JSONObject c = contacts.getJSONObject(i);

        // Storing each json item in variable
        sample[i].id = c.getString("id");
        sample[i].name = c.getString("name");
        sample[i].email = c.getString("subtitle");
        sample[i].address = c.getString("key1");
        sample[i].gender = c.getString("key12");
        sample[i].gender = c.getString("location");
        sample[i].gender = c.getString("key13");
        sample[i].gender = c.getString("key14");
        sample[i].gender = c.getString("key15");
        sample[i].gender = c.getString("result_status");
       }