How to send Firebase Push Notification from HTTP server using java

Firebase HTTP server side code using java 

hello all

Before going to code , go through this link which will give you the format of the message as json that we are going to send as firebase push notification.

I am going to send below format json as push notification

 

 {

    "to" : "token which is received in android or ios app",

    "notification" : {

      "body" : "great match!",

      "title" : "Portugal vs. Denmark",

      "icon" : "myicon"

    },

    "data" : {

      "Nick" : "Mario",

      "Room" : "PortugalVSDenmark"

    }

  }

************************************************************

Now lets start coding :)

//import necessary packages  

import java.io.DataOutputStream;

import java.net.URL;

import java.util.HashMap;

import javax.net.ssl.HttpsURLConnection;

import org.json.simple.JSONObject;

public class Fcmtest {

/**

* @param args

*/

public static void main(String[] args) {

HttpsURLConnection con = null;

//FIREBASE_SERVER_KEY is nothing but server key that you got while creating firebase project in fcm

String FIREBASE_SERVER_KEY ="xxxxxxxxxxxxxxxx";

HashMap<String, Object> data = new HashMap<String, Object>();

data.put("Nick", "Mario!");

data.put("Room", "PortugalVSDenmark");

JSONObject dataJsonObject = new JSONObject();

dataJsonObject.put("hello", "world");

dataJsonObject.put("marco", "polo");

JSONObject titleInfo = new JSONObject();

titleInfo.put("body","great match!");

titleInfo.put("icon","myicon");

titleInfo.put("title", "Portugal vs. Denmark");

JSONObject finalJsonMessage= new JSONObject();

finalJsonMessage.put("notification", titleInfo);

finalJsonMessage.put("data", dataJsonObject);

//replace xxxxxxxx with token that you got when your app run first time means when your device registered to receive fcm from firebase

finalJsonMessage.put("to", "xxxxxxxxxxxxxxxxxxxxxxxxxxxx");

try{

String url = "https://fcm.googleapis.com/fcm/send";

URL obj = new URL(url);

con = (HttpsURLConnection) obj.openConnection();

con.setRequestMethod("POST");

// Set POST headers

con.setRequestProperty("Authorization", "key="+FIREBASE_SERVER_KEY);

con.setRequestProperty("Content-Type", "application/json");

// Send POST body

con.setDoOutput(true);

DataOutputStream wr = new DataOutputStream(con.getOutputStream());

wr.writeBytes(finalJsonMessage.toJSONString());

wr.flush();

wr.close();

con.getResponseCode();

}

catch(Exception e){

e.printStackTrace();

}

}

}

Thank you

mithun