服务器响应采用 json 形式

Question

我想从服务器发送和接收数据。为此，我使用了Volley.代码如下。Volley可以接收Json格式的数据。服务器可以Json格式发送和接收数据。如何将此 Json 数据转换为用户可读的JAVA格式？其他类中大约有 10 个方法。下面的类包含网络调用的方法，并且还与MainActivity交互。

public class Api_Volley {
String data;
String flag;
public void my_volley_post (String url , JSONObject jsonObject , final Context context ) {
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url  , jsonObject , new Response.Listener(){
@Override
public void onResponse(Object response) {
String flag = response.toString();
Toast.makeText( context , flag , Toast.LENGTH_LONG ).show();
}
},new Response.ErrorListener(){
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(context , "Wrong" , Toast.LENGTH_LONG).show();
error.printStackTrace();
}
});
ApiVolleySingeltonClass.getInstance(context).addToRequestque(jsonObjectRequest);
}
}

另一个类中的方法：

public void showAllOrderByUserId() {
try {
data_args.put("userId", 2);
} catch (JSONException e) {
e.printStackTrace();
}
try {
data_action.put("action", "showAllOrderByUserId");
data_action.put("args", data_args);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
route = "/order";
new Api_Volley().my_volley_post(addUserUrl + route, data_action, context);
} 

Answer 1

1. 您可以使用 json 数据，例如

   {"userNodes"：[{"id"："1"，"name"："Enamul Haque"}]}

2. 你可以像波纹管一样使用凌空抽射

   private void doLoginAction() {
   
   String url_login = "http://www.lineitopkal.com/android/login.php";
   
   StringRequest stringRequest = new StringRequest(Request.Method.POST, url_login,
   new Response.Listener<String>() {
   @Override
   public void onResponse(String response) {
   //pDialog.dismiss();
   
   try {
   JSONObject jsonObject = new JSONObject(response);
   JSONArray loginNodes = jsonObject.getJSONArray("userNodes");
   for (int i = 0; i < loginNodes.length(); i++) {
   JSONObject jo = loginNodes.getJSONObject(i);
   String id = jo.getString("id");
   Log.e("id ::",id);                                
   String name = jo.getString("name");
   Log.e("name ::",name);
   
   }
   } catch (JSONException e) {
   e.printStackTrace();
   }
   
   }
   },
   new Response.ErrorListener() {
   @Override
   public void onErrorResponse(VolleyError error) {
   try {
   if (error instanceof TimeoutError ) {
   //Time out error
   }else if(error instanceof NoConnectionError){
   //net work error
   } else if (error instanceof AuthFailureError) {
   //error
   } else if (error instanceof ServerError) {
   //Erroor
   } else if (error instanceof NetworkError) {
   //Error
   } else if (error instanceof ParseError) {
   //Error
   }else{
   //Error
   }
   //End
   
   } catch (Exception e) {
   
   }
   }
   }) {
   @Override
   protected Map<String, String> getParams() {
   Map<String, String> params = new HashMap<>();
   //Post parameter like bellow
   params.put("uname", "[e-mail]");
   params.put("pass", "123456");
   
   return params;
   }
   };
   RequestQueue requestQueue = Volley.newRequestQueue(this);
   requestQueue.add(stringRequest);
   }
   

Answer 2

像这样创建响应格式

public class Post {
long id;
Date dateCreated;
String title;
String author;
String url;
String body;
}

提出如下请求后

public void my_volley_post (String url , JSONObject jsonObject , final Context context ) {
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, url  , jsonObject , new Response.Listener(){
@Override
public void onResponse(String response) {
GsonBuilder gsonBuilder = new GsonBuilder();
gson = gsonBuilder.create();

这将是您的实体

Post post = gson.fromJson(response, Post.class));

},new Response.ErrorListener(){
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(context , "Wrong" , Toast.LENGTH_LONG).show();
error.printStackTrace();
}
});
ApiVolleySingeltonClass.getInstance(context).addToRequestque(jsonObjectRequest);
}

Answer 3

你必须解析JSON，并且必须根据需要显示：

通过这个，您可以使用GSON(它很容易( 使用此站点将 JSON 转换为 pojo 类。 点击这里

这些是您可以使用和实现的参考站点：

http://www.vogella.com/tutorials/JavaLibrary-Gson/article.html

https://www.javacodegeeks.com/2011/01/android-json-parsing-gson-tutorial.html

https://kylewbanks.com/blog/tutorial-parsing-json-on-android-using-gson-and-volley