假設現在有這樣一個 JSONObject

{
    "data": {
        "is_admin": false,
        "app_id": 10,
        "user": {
            "id": "2xxxxx",
            "phone": "186xxxxxx",
            "area": "beijing",
            "is_active": "1",
            "is_admin": false,
        }
    },
    "expire": 18000
}

System.out
 
.println(responseJson);
String username = String.valueOf(responseJson.getJSONObject("data").getJSONObject("user").get("area"));

通過這種方式即可獲取 area 的值