Example to demonstrate sharing of ServerSocket ports with Java 9

readme.md

Run the SharedServerSocketPortExample two times:

Then try to connect via telnet localhost 6666 from two shells.

SharedServerSocketPortExample.java

package demo.net;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.StandardSocketOptions;
import java.util.UUID;

public class SharedServerSocketPortExample {

	public static void main(String[] args) throws IOException {

		try (ServerSocket ss = new ServerSocket()) {
			
			ss.setOption(StandardSocketOptions.SO_REUSEPORT, true);
			ss.bind(new InetSocketAddress(6666));

			UUID instanceId = UUID.randomUUID();
			System.out.printf("Instance: %s listening on: %s%n", instanceId, ss);
			byte[] prefix = ("From " + instanceId + ": ").getBytes();
			
			Socket client = ss.accept();

			client.getInputStream().transferTo(new FilterOutputStream(client.getOutputStream()) {

				@Override
				public void write(byte[] b, int off, int len) throws IOException {
					super.write(prefix, 0, prefix.length);
					super.write(b, off, len);
				}
			});
		}
	}

}

good job. help me a lot.