How can I implement a threaded UDP based server in Java?

Question

How can I implement a threaded UDP based server in Java ?

Basically what I want, is to connect multiple clients to the server, and let each client have his own threa

Answer 1

Since UDP is a connectionless protocol, why do you need to spawn a new thread for each connection? When you receive a UDP packet maybe you should spawn a new thread to take care of dealing with the message received.

UDP connections are not like TCP connections. They do not remain active and such is the design of UDP.

The handlePacket() method of this next code block can do whatever it wants with the data received. And many clients can send multiple packets to the same UDP listener. Maybe it will help you.

public void run() {
        DatagramSocket wSocket = null;
        DatagramPacket wPacket = null;
        byte[] wBuffer = null;

        try {
            wSocket = new DatagramSocket( listenPort );
            wBuffer = new byte[ 2048 ];
            wPacket = new DatagramPacket( wBuffer, wBuffer.length );
        } catch ( SocketException e ) {
            log.fatal( "Could not open the socket: \n" + e.getMessage() );
            System.exit( 1 );
        }

        while ( isRunning ) {
            try {
                wSocket.receive( wPacket );
                handlePacket( wPacket, wBuffer );
            } catch ( Exception e ) {
                log.error( e.getMessage() );
            }
        }
    }