Tcp java

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

public class Tcp_server {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		try {
			ServerSocket ss = new ServerSocket(666);

			//Socket socket = ss.accept();

			while (true) {
				Socket socket = ss.accept();
				System.out.println("sercer: " + socket);

				InputStream is = socket.getInputStream();
				byte[] b = new byte[1024];
				int len = 0;
				
				String str = null;
				while ((len = is.read(b)) != -1) {
					str = new String(b, 0, len);
					System.out.println(str);
				}

				socket.shutdownInput();

				String date = "hello client, I have received yuour letter";
				OutputStream os = socket.getOutputStream();
				os.write(date.getBytes());

				socket.shutdownOutput();

				socket.close();
				is.close();
				os.close();
				if(str.equals("end"))
					break;
			}
			ss.close();

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

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

public class Tcp_client {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		try {
			Socket socket = new Socket(InetAddress.getLocalHost(), 666);
			System.out.println("client: "+socket);
			
			String date = "hello server";
			OutputStream os = socket.getOutputStream();
			os.write(date.getBytes());
			
			socket.shutdownOutput();
			
			InputStream is = socket.getInputStream();
			byte[] b = new byte[1024];
			int len = 0;
			while((len = is.read(b))!=-1)
			{
				String str = new String(b, 0, len);
				System.out.println(str);
			}
			
			socket.shutdownInput();
			
			os.close();
			is.close();
			socket.close();
			
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}