如何使用Gson从Webservice结果解析JSON

当我向服务器发送请求时。 我使用以下格式获取结果数据：

{
"menu": {
    "7": [{
        "m_id": "1",
        "m_flag": "1",
        "m_type": "7",
        "m_name": "\u30cf\u30a4\u30cd\u30b1\u30f3",
        "m_price": "1000",
        "m_cost": "158",
        "m_regist_date": "0000-00-00",
        "p_id": "0"
    }, {
        "m_id": "2",
        "m_flag": "1",
        "m_type": "7",
        "m_name": "\u30ae\u30cd\u30b9",
        "m_price": "1000",
        "m_cost": "250",
        "m_regist_date": "0000-00-00",
        "p_id": "0"
    },....
    "2": [{
        "m_id": "149",
        "m_flag": "1",
        "m_type": "2",
        "m_name": "\u30da\u30fc\u30bf\u30fc\u30e4\u30b3\u30d6\u30ea\u30fc\u30b9\u30ea\u30f3\u30b0",
        "m_price": "6500",
        "m_cost": "2100",
        "m_regist_date": "0000-00-00",
        "p_id": "0"
    }, {
        "m_id": "150",
        "m_flag": "1",
        "m_type": "2",
        "m_name": "\u30a4\u30d3\u30b9\u30af\u30b9 \u30eb\u30fc\u30b8\u30e5 08",
        "m_price": "6800",
        "m_cost": "2520",
        "m_regist_date": "0000-00-00",
        "p_id": "0"
    },...
}

它很长。所以当我使用：

JSONObject json = jsonParser.makeHttpRequest(REQUEST_URL, "POST",params);
menu = json.getJSONArray("menu");

我收到错误，无法获取JSON的数据：

Error parsing data org.json.JSONException: End of input at character 0 of 

如何解析json的数据，我不知道如何使用Gson。 如何获取键“2”的数据。

---

多谢各位

如果您正在查找

GSON

解析，请在此处找到它

只需创建一个POJO类并将其映射到JSON字符串

示例代码：

class MenuDetail {
    private String m_id;
    private String m_flag;
    private String m_type;
    private String m_name;
    private String m_price;
    private String m_cost;
    private String m_regist_date;
    private String p_id;
    // getter & setter
}

...

Type type = new TypeToken<Map<String, Map<String, ArrayList<MenuDetail>>>>() {}.getType();
Map<String, Map<String, ArrayList<MenuDetail>>> data = new Gson().fromJson(json, type);

System.out.println(new GsonBuilder().setPrettyPrinting().create().toJson(data));

---

首先，非常感谢！我找到了它，但我不知道：如果我有任何键的很长字符串结果，我只想获取键“7”的数据，以便解析到Listview。我怎样才能得到它？只要从地图上得到就行了

data.get（“menu”）.get（“7”）

将返回

MenuDetail的
ArrayList
{
  "menu": {
    "7": [
      {
        "m_id": "1",
        "m_flag": "1",
        "m_type": "7",
        "m_name": "name",
        "m_price": "1000",
        "m_cost": "158",
        "m_regist_date": "0000-00-00",
        "p_id": "0"
      },
      {
        "m_id": "2",
        "m_flag": "1",
        "m_type": "7",
        "m_name": "name",
        "m_price": "1000",
        "m_cost": "250",
        "m_regist_date": "0000-00-00",
        "p_id": "0"
      }
    ]
  }
}