package tcp;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

public class ServerCode 

{

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

		ServerSocket s = new ServerSocket(3333);

       System.out.println("The Server is start: " + s);

              // 阻塞,直到有客户端连接

       Socket socket = s.accept();

       try {

    	   System.out.println("Accept the Client: " + socket);                   

          //设置IO句柄

    	  BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

          PrintWriter out = new PrintWriter(new BufferedWriter(

          new OutputStreamWriter(socket.getOutputStream())), true);                    

          while (true)

          {

        	  String str = in.readLine();

        	  if (str.equals("byebye")){break;}

        	  System.out.println("In Server reveived the info: " + str);

        	  out.println(str);

        	  }

          }

       finally {

    	   System.out.println("close the Server socket and the io.");

    	   socket.close();

    	   s.close();

    	   }

    }

}

package tcp;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.InetAddress;

import java.net.Socket;

public class ClientCode

{

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

		Socket socket = new Socket("localhost", 3333);

		try{

         System.out.println("socket = " + socket);

         BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

          PrintWriter out = new PrintWriter(new BufferedWriter(

          new OutputStreamWriter(socket.getOutputStream())), true);

          out.println("Hello Server,I am ");

           String str = in.readLine();

           System.out.println(str);

           out.println("byebye");

           }

             finally {

            	 System.out.println("close the Client socket and the io.");

            	 socket.close();

       }

      }

}