使用Gson反序列化JSON Facebook提要 [英] Deserialize JSON Facebook feed using Gson

问题描述

我有一个来自Facebook的JSON响应，其结构如下：

  {
data：[
 {
id：105458566194298_411506355589516，
message：...，
type：status，
created_time： 2012-11-25T17：26：41 + 0000，
updated_time：2012-11-25T17：26：41 + 0000，
comments：{
计数：
}，
 {
id：105458566194298_411506355589516，
message：...，
type：状态，
created_time：2012-11-25T17：26：41 + 0000，
updated_time：2012-11-25T17：26：41 + 0000，
意见：{
count：0 
} 
] 
} 
  

我试图用Gson库反序列化它：

  public class FacebookPost {
 public String Message; 
 public String Created_time; 
 
  

---

  Gson gson = new GsonBuilder（）。create（）; 
 
类型listType = new TypeToken< ArrayList< FacebookPost>>（）{} .getType（）; 
 
 ArrayList< FacebookPost> userList = gson.fromJson（responseJsonString，listType）; 
  

如果响应不是封装在中的数据：[] - 容器。但是，如何告诉gson在JSON响应中查看 data 内部？

您应该这样做：

  InputStream source = retrieveStream（url）; 
 Gson gson = new Gson（）; 
 Reader reader = new InputStreamReader（source）; 
 APIResponse response = gson.fromJson（reader，APIResponse.class）; 
  

与：

 公共类APIResponse {
 
 ArrayList< FacebookPost>数据; 
 
 public class FacebookPost {
 public String message; 
 public String created_time; 
} 
} 
  

I have a JSON response from Facebook with the following structure:

{
    "data": [
      {
         "id": "105458566194298_411506355589516",
         "message": "...",
         "type": "status",
         "created_time": "2012-11-25T17:26:41+0000",
         "updated_time": "2012-11-25T17:26:41+0000",
         "comments": {
            "count": 0
      },
      {
         "id": "105458566194298_411506355589516",
         "message": "...",
         "type": "status",
         "created_time": "2012-11-25T17:26:41+0000",
         "updated_time": "2012-11-25T17:26:41+0000",
         "comments": {
            "count": 0
      }
    ]
}

I'm trying to deserialize it using the Gson library:

public class FacebookPost {
    public String Message;
    public String Created_time;
}

---

Gson gson = new GsonBuilder().create();

Type listType = new TypeToken<ArrayList<FacebookPost>>() {}.getType();

ArrayList<FacebookPost> userList = gson.fromJson(responseJsonString, listType);

This would obviosuly just work if the response wasn't wrapper in the "data": [ ] - container. But how do I tell gson to look inside data in the JSON response?

解决方案

You should do something like that:

InputStream source = retrieveStream(url);
Gson gson = new Gson();
Reader reader = new InputStreamReader(source);
APIResponse response = gson.fromJson(reader, APIResponse.class);

With:

Public class APIResponse{

    ArrayList <FacebookPost> data;

    public class FacebookPost {
        public String message;
        public String created_time;
    }
}

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