Android Volley如何接收和發送JSON

Question

我制作了一個應用程序，在特定部分中，我發送了一個字符串並接收了一個json。 我使用VOLLEY，效果很好，但現在我需要發送一個json。

這是我的代碼：

 public static final String DATA_URL = "http://unynote.esy.es/cas/read_allorder.php?id=";  // THIS HAVE TO CHANGE JUST TO LOCALHOST:8080/LOGIN

這里：

public class Config {
public static final String DATA_URL = "http://unynote.esy.es/cas/read_allorder.php?id=";  // THIS HAVE TO CHANGE JUST TO LOCALHOST:8080/LOGIN
public static final String KEY_NAME = "COD_ALUMNO";
public static final String KEY_ADDRESS = "COD_ASIGNATURA";
public static final String KEY_VC = "GRUPO_SECCION";

public static final String KEY_AULA = "AULA";
public static final String KEY_DIA = "DIA";
public static final String KEY_INICIO = "INICIO";
public static final String KEY_FIN = "FIN";

public static final String JSON_ARRAY = "result";

 }

這是凌空規則的一部分

public class TabsActivity extends AppCompatActivity implements  
 View.OnClickListener {

private EditText editTextId;
private Button buttonGet;
private TextView textViewResult;

private ProgressDialog loading;

int cont=1;
String[ ] contenido = new String[7];
String f="";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_mainint);

    editTextId = (EditText) findViewById(R.id.editTextId);
    buttonGet = (Button) findViewById(R.id.buttonGet);
    textViewResult = (TextView) findViewById(R.id.textViewResult);

    buttonGet.setOnClickListener(this);
}

private void getData() {
    String id = editTextId.getText().toString().trim();
    if (id.equals("")) {
        Toast.makeText(this, "Please enter an id", Toast.LENGTH_LONG).show();
        return;
    }
    loading = ProgressDialog.show(this,"Please wait...","Fetching...",false,false);

    String url = Config.DATA_URL+editTextId.getText().toString().trim();

    StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            loading.dismiss();
            Toast.makeText(getBaseContext(), "si", Toast.LENGTH_LONG).show();

            showJSON(response);
        }
    },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    Toast.makeText(TabsActivity.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();
                }
            });

    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(stringRequest);
}

private void showJSON(String response){

   // Toast.makeText(getBaseContext(), response, Toast.LENGTH_LONG).show();

    String name="";
    String address="";
    String grupo = "";
    String aula = "";
    String dia = "";
    String inicio = "";
    String fin = "";



    try {
        Toast.makeText(getBaseContext(), "LOGIN... ", Toast.LENGTH_LONG).show();
        JSONObject jsonObject = new JSONObject(response);

        JSONArray ja = jsonObject.getJSONArray("orders");
        // JSONArray result = jsonObject.getJSONArray(Config.JSON_ARRAY);
        for (int i = 0; i < ja.length(); i++) {
            JSONObject collegeData = ja.getJSONObject(i);
            name = collegeData.getString("id");
            address = collegeData.getString("item");
             grupo = collegeData.getString("GRUPO_SECCION");
             aula = collegeData.getString("AULA");
             dia = collegeData.getString("DIA");
             inicio = collegeData.getString("INICIO");
             fin = collegeData.getString("FIN");

            ///database
            DBAdapter db= new DBAdapter(this);

            db.open();
            long id = db.insertContact(address, aula,dia,inicio,fin );
            db.close();

            db.open();
            Cursor c = db.getAllContacts();
            if (c.moveToFirst())
            { do{
                contenido=getcontenido(c);

            }while (c.moveToNext());
            }
            db.close();
            cont= Integer.parseInt( contenido[0]);
            /// database

            /// alarms
            int [] time;
            time = parsetime(inicio);

            int horai = time[0];
            int minutoi = time[1];
            int diaa = getDay(dia);

            Calendar cal = Calendar.getInstance();
            cal.setTimeInMillis(System.currentTimeMillis());
            cal.set(Calendar.HOUR_OF_DAY, horai);
            cal.set(Calendar.MINUTE, minutoi);
            cal.set(Calendar.DAY_OF_WEEK, diaa);
            cal.add(Calendar.SECOND, 2);


            Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
            intent.putExtra("name", address);
            //intent.putExtra("curos bn",1);
            PendingIntent pendingIntent =
                    PendingIntent.getBroadcast(getBaseContext(),
                            cont+1, intent, PendingIntent.FLAG_UPDATE_CURRENT );




            AlarmManager alarmManager =
                    (AlarmManager)getSystemService(Context.ALARM_SERVICE);
            alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
                    cal.getTimeInMillis(), 24 * 7 * 60 * 60 * 1000 , pendingIntent);


            ////alarms



            f=f+"codigo alumno:\t"+name+"\ncodigo/nombre curso:\t" +address+ "\ngrupo:\t"+grupo+"\naula:\t"
            +aula+"\ndia:\t"+dia+"\ninicio:\t"+inicio+"\nfin:\t"+fin+"\n:\t";

        }
        //  Toast.makeText(getBaseContext(),  collegeData.length(), Toast.LENGTH_LONG).show();
        //collegeData.toString();
    } catch (JSONException e) {
        e.printStackTrace();
    }
    textViewResult.setText(f);
}

我已發送了STRING editTextId.getText（）。 那是每個用戶的代碼，但是現在我需要發送帶有該字符串的json。

'CCODUSU''45875621'

CCODUSU是標識符

Answer 1

我來看看StringRequests。 這是一個如何將內容發送到PHP文件，更新數據庫或可以執行任何操作的示例：

SetMyStuff.java：

package com.example.your_app.database_requests;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.StringRequest;

import java.util.HashMap;
import java.util.Map;

public class SetMyStuff extends StringRequest {

    private static final String LOGIN_REQUEST_URL = "http://example.com/SetMyStuff.php";
    private Map<String, String> params;

    public SetMyStuff(String username, String password, Response.Listener<String> listener) {
        super(Request.Method.POST, LOGIN_REQUEST_URL, listener, null);
        params = new HashMap<>();
        params.put("username", username);
        params.put("password", password);
    }

    @Override
    public Map<String, String> getParams() {
        return params;
    }

}

調用此StringRequest：

Response.Listener<String> listener = new Response.Listener<String>() {

                @Override
                public void onResponse(String response) {
                    try {
                        JSONObject jsonResponse = new JSONObject(response);

                        boolean success = jsonResponse.getBoolean("success");

                        if (!success) {
                            Log.e(TAG, "Could not update stuff.");
                        } else {
                            Log.e(TAG, "Updated stuff.");
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            };
            SetMyStuff setMyStuffRequest = new SetMyStuff(username, password, listener);
            RequestQueue requestQueue = Volley.newRequestQueue(context);
            requestQueue.add(setMyStuffRequest);

接收到此的PHP文件：

<?php

    $password = $_POST["password"];
    $username = $_POST["username"];

    $con = mysqli_connect("website.com", "dbusername", "dbpassword", "dbtable");

    $response = array();
    $response["success"] = false;

    /* Do something */
    $response["success"] = true;

    echo json_encode($response);
?>

Answer 2

您的意思是您需要發送一個包含editTextId.getText().toString().trim()的JSON ，如果要執行此操作，則必須拼出完整且正確的JSON 。

'CCODUSU' '45875621'

您發布的字符串不是json ，您需要將其修改為：

{"CCODUSU": "45875621"}

在Config.DATA_URL之后提供此字符串后，服務器將接收id參數，它是JSON 。

Answer 3

我也提出了同樣的問題。在尋找方法的過程中，我開發了一種可能對您有所幫助的方法。 如果要將json發送到服務器，則可以將JsonObjectRequest創建為：

public class AppJSONObjectRequest extends JsonObjectRequest{

private Response.Listener<JSONObject> listener;
private Map<String, String> headers;

public AppJSONObjectRequest(int method, String url, JSONObject jsonObject, Response.Listener<JSONObject> reponseListener, Response.ErrorListener errorListener, Map<String, String> headers) {
    super(method, url, jsonObject, reponseListener, errorListener);
    this.headers = headers;
    this.listener = reponseListener;
}

@Override
protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
    try {
        String jsonString = new String(response.data,
                HttpHeaderParser.parseCharset(response.headers));
        return Response.success(new JSONObject(jsonString),
                HttpHeaderParser.parseCacheHeaders(response));
    } catch (UnsupportedEncodingException e) {
        return Response.error(new ParseError(e));
    } catch (JSONException je) {
        return Response.error(new ParseError(je));
    }
}

@Override
protected void deliverResponse(JSONObject response) {
    listener.onResponse(response);
}

@Override
public Map<String, String> getHeaders() throws AuthFailureError {
    return headers;
}
}

然后，您可以在活動或片段中使用此jave文件來發送json並接收如下響應：

JSONObject parameters = new JSONObject();
    try {

        parameters.put("f_name", "name1");
        parameters.put("l_name", "name2");
        .......


    }catch (Exception e){
        e.printStackTrace();
    }

    AppJSONObjectRequest objectRequest = new AppJSONObjectRequest(Request.Method.PUT, url, parameters, RequestSuccessListener, RequestErrorListener, getHeaders); //headers if u have
    //url: your request base url

    VolleySingleton volleySingleton = VolleySingleton.getInstance(this);
    volleySingleton.addToRequestQueue(objectRequest);

而且您可以將json接收為：

Response.Listener<JSONObject> RequestSuccessListener = new Response.Listener<JSONObject>() {
    @Override
    public void onResponse(JSONObject response) {

        Log.i(TAG, "Response" + " " + response);

    }
};

Response.ErrorListener RequestErrorListener = new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        error.printStackTrace();

    }
};

您可以通過以下方式獲得標題：

public Map<String, String> getHeaders() {

    Map<String, String> headers = new HashMap<>();
    headers.put("x-auth-token", Constant.API_KEY_X_AUTH_TOKEN);
    return headers;
}

凌空排球課

public class VolleySingleton {
private static VolleySingleton mInstance;
private Context mContext;
private RequestQueue mRequestQueue;


private VolleySingleton(Context context){
    this.mContext = context;
    mRequestQueue = getRequestQueue() ;
}

public static synchronized VolleySingleton getInstance(Context context){
    if(mInstance == null){
        mInstance = new VolleySingleton(context);
    }
    return mInstance;
}

public RequestQueue getRequestQueue() {
    if (mRequestQueue == null) {
        // getApplicationContext() is key, it keeps you from leaking the
        // Activity or BroadcastReceiver if someone passes one in.
        mRequestQueue = Volley.newRequestQueue(mContext.getApplicationContext());
    }
    return mRequestQueue;
}

public <T> void addToRequestQueue(Request<T> req){
    getRequestQueue().add(req);
}
}

只要您可以實現上面的示例...然后希望您會得到想要的結果。它可能是復制粘貼代碼，但涵蓋的范圍足以解決您的問題。