java - 从数据库获取信息

Question

我已经设置了 okHttp，以便 response.body().string(); 返回

[{"id":"1","username":"netsgets","password":"test","likedOne":"","likedTwo":"","likedThree":"","likedFour":"","likedFive":""},{"id":"2","username":"test","password":"test","likedOne":"","likedTwo":"","likedThree":"","likedFour":"","likedFive":""},{"id":"3","username":"netsgets2","password":"test","likedOne":"","likedTwo":"","likedThree":"","likedFour":"","likedFive":""}]

我想搜索所有用户名并将它们添加到 HashMap 中。这是我所拥有的，但它不起作用:

final String TestVar = response.body().string();

                                for (int data_i = 0; data_i < TestVar.length(); data_i++) {
                                    Log.d("OkHttp","debug3");
                                    HashMap<String, String> hashMap = new HashMap<String, String>();


                                    try {
                                        hashMap.put("username",
                                                TestVar.getString("username"));
                                    } catch (JSONException e) {
                                        e.printStackTrace();
                                    }

                                    usersInfo.add(hashMap);




                                }
                            }

不仅不起作用，TestVar.getString("username") 还会出错。请帮忙。

Answer 1

您的响应是 JSONArray 因此您需要解析 JSON 并获取对象。 要从 JSON 获取对象，请尝试以下代码

try {
    HashMap<String, String> hashMap = new HashMap<String, String>();
    String TestVar = response.body().string();
    JSONArray jsonArray = new JSONArray(TestVar);
    for(int i = 0; i < jsonArray.length(); i++) {
        JSONObject jsonObject = jsonArray.getJSONObject(i);
        hashMap.put("username", jsonObject.getString("username"));
    }
}catch (JSONException e) {
    e.printStackTrace();
}

希望这对您有帮助。