Last updated on January 8th, 2020 at 10:03 pm
You can use Volley Library to send data to server please Check this Post:- Send data to the server using Volley.
In this post i explain you how we can POST JSON data to server in android. There are no of ways through which we can send data to server. In this i also explain how we can handle incoming JSON data on server. This simple and easiest way to send data to server i am not using any extra library for this.
Step 1. Create new project in Android Studio/ Eclipse.
Step 2. Open your activity_main.xml inside layout folder and add the following code.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<TextView
android:id="@+id/raw"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/sendData"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Send data" />
</LinearLayout>And also Don’t forget to add internet permission to your AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
Step 3. Now open your MainActivity.java in side java folder and add bellow code. In this code we post data to server i am using POST method and create post variable/key {req} inside this i put JSON note i convert my JSON to string so it will transfer to string.
package com.senddatatoserver;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ActionBarActivity {
Button bt;
TextView txt;
// Response
String responseServer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txt = (TextView) findViewById(R.id.raw);
bt = (Button) findViewById(R.id.sendData);
bt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AsyncT asyncT = new AsyncT();
asyncT.execute();
}
});
}
/* Inner class to get response */
class AsyncT extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... voids) {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("<YOUR_SERVICE_URL>");
try {
JSONObject jsonobj = new JSONObject();
jsonobj.put("name", "Aneh");
jsonobj.put("age", "22");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("req", jsonobj.toString()));
Log.e("mainToPost", "mainToPost" + nameValuePairs.toString());
// Use UrlEncodedFormEntity to send in proper format which we need
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
InputStream inputStream = response.getEntity().getContent();
InputStreamToStringExample str = new InputStreamToStringExample();
responseServer = str.getStringFromInputStream(inputStream);
Log.e("response", "response -----" + responseServer);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
txt.setText(responseServer);
}
}
public static class InputStreamToStringExample {
public static void main(String[] args) throws IOException {
// intilize an InputStream
InputStream is =
new ByteArrayInputStream("file content..blah blah".getBytes());
String result = getStringFromInputStream(is);
System.out.println(result);
System.out.println("Done");
}
// convert InputStream to String
private static String getStringFromInputStream(InputStream is) {
BufferedReader br = null;
StringBuilder sb = new StringBuilder();
String line;
try {
br = new BufferedReader(new InputStreamReader(is));
while ((line = br.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sb.toString();
}
}
}Step 4. Now when we receive data at server end we need to get object. I am using PHP to get this data.
<?php $get = json_decode(stripslashes($_POST['req'])); // Get data from object $name = $get->name; // Get name you send $age = $get->age; // Get age of user // Your code.....
Done. 🙂