CODEWITHSUNDEEP
java
avi
avi

Reputation: 441

Java DatagramPacket and DatagramSocket not receiving data

I am trying to receive a simple string using DatagramPacket and DatagramSocket class in Java.

Here is my code:

public static void main(String [] args){

    DatagramSocket aSocket = null;

    try{
        aSocket= new DatagramSocket();
        String aMessage = "my message";
        System.out.println("1");
        byte [] m = aMessage.getBytes();
        InetAddress aHost = InetAddress.getByName("localhost");
        int serverPort = 6789;
        DatagramPacket request = new DatagramPacket(m,aMessage.length(),aHost,serverPort);
        System.out.println("2");
        aSocket.send(request);
        System.out.println("3");
        byte [] buffer = new byte[1000];
        System.out.println("4");
        DatagramPacket reply = new DatagramPacket(buffer,buffer.length);
        aSocket.receive(reply);
        System.out.println("5");
        System.out.println("DATA RECEIVED" + reply.getData());
        aSocket.close();

    }
    catch(SocketException ex){
       ex.printStackTrace();
    }

    catch(IOException ioe){
       ioe.printStackTrace();
    }
}

It's not printing the received data. I have put System.out.println just to see where the code is executed, and it stops at 4, it does not print 5, meaning the problem is just below 4. Why am I not receiving the data, can anybody help me with this please?

Upvotes: 2

Views: 7982

Answers (1)

user1999257
user1999257

Reputation:

@avi dont use the same datagram socket for getting rely. For getting reply you have to mention the port nomber of the server datagram socket.use

DatagramSocket datagramSocket = new DatagramSocket(6789);// Which is given by you only

then use datagramSocket.receive(reply);

and also for getting address use this method

InetAddress aHost = InetAddress.getLocalHost();

instead of

InetAddress aHost = InetAddress.getByName("localhost");

Take a refrence of this link

http://www.java2s.com/Code/Java/Network-Protocol/UseDatagramSockettosendoutandreceiveDatagramPacket.htm

Upvotes: 3

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