пример сервера на сокетах

package ru.rpod.taop._16;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

	public static void main(String args[]) {
		Socket client = null;
		ServerSocket serverSocket = null;
		
		try {
			serverSocket = new ServerSocket(3456);
			System.out.println("Waiting...");
			do{
				client = serverSocket.accept();
				System.out.println("Client connected...");
				InputStream is = client.getInputStream();
				byte[] bytes = new byte[18];
				is.read(bytes);
				System.out.println("Server get information: "+new String(bytes));
				OutputStream os = client.getOutputStream();
				bytes = "Hello from serer".getBytes();
				os.write(bytes);
				
				is.close();
				os.close();
			}
			while(true);

		} catch (IOException e) {
			e.printStackTrace();
		}
		finally{
			try{
				if(client!=null) client.close();
				if(serverSocket!=null) serverSocket.close();
			}
			catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}