hwserver.java

package guide;

//
//  Hello World server in Java
//  Binds REP socket to tcp://*:5555
//  Expects "Hello" from client, replies with "World"
//

import org.zeromq.SocketType;
import org.zeromq.ZMQ;
import org.zeromq.ZContext;

public class hwserver
{
    public static void main(String[] args) throws Exception
    {
        try (ZContext context = new ZContext()) {
            // Socket to talk to clients
            ZMQ.Socket socket = context.createSocket(SocketType.REP);
            socket.bind("tcp://*:5555");

            while (!Thread.currentThread().isInterrupted()) {
                byte[] reply = socket.recv(0);
                System.out.println(
                    "Received " + ": [" + new String(reply, ZMQ.CHARSET) + "]"
                );

                String response = "world";
                socket.send(response.getBytes(ZMQ.CHARSET), 0);

                Thread.sleep(1000); //  Do some 'work'
            }
        }
    }
}