java项目---用java实现简单TCP服务器监听(3星)

---------------------------------------------服务端-----------------------------------------------

 1 package C;
 import java.io.*;
 import java.net.*;

 public class Server extends ServerSocket
 {
     public Server(int serverPort) throws IOException
     {
         super(serverPort);
         try
         {
             while (true)
             {
                 Socket socket = accept();
                 new ServerThread(socket);
             }
         } catch (IOException e) {
             e.printStackTrace();
         }
         finally {
             close();
         }
     }
     class ServerThread extends Thread       /*建立服务端线程*/
     {
         private Socket socket;
         private BufferedReader in;
         private PrintWriter out;
         public ServerThread(Socket s) throws IOException
         {
             this.socket = s;
             in = new BufferedReader(new InputStreamReader(
                     socket.getInputStream(), "GB2312"));        /*国标码*/
             out = new PrintWriter(socket.getOutputStream(),true);
             start();                /*开始线程*/
         }

         public void run()
         {
                     try {
                 while (true)
                 {
                     String line = in.readLine();
                     if ("finish".equals(line))
                     {
                         System.out.println("服务器已停止监听");
                         break;
                     }
                     System.out.println("接收到的数据：" + line);
                     String msg = "'" + line + "'已传输到服务器端.";
                     out.println(msg);
                     out.flush();
                 }
                 out.close();
                 in.close();
                 socket.close();
             }
             catch (IOException e)
             {
                 e.printStackTrace();
             }
         }
     }
         public static void main(String[] args) throws IOException
         {
             System.out.println("服务器开始运行......");
             new Server(2333);       /*绑定端口号*/
         }

 }

---------------------------------------------客户端-----------------------------------------------

 1 package C;
 import java.io.*;
 import java.net.*;

     public class Client
     {
         private Socket socket;                  /*定义socket连接*/
         private BufferedReader reader;          /*从字符输入流读取文本*/
         private PrintWriter writer;             /*打印到文本输出流*/

         public Client(int serverPort) {                 /*定义客户端端口号*/
             try {                                                       /*抛异常*/
                 socket = new Socket("123.206.78.55", serverPort);
                 reader = new BufferedReader(
                         new InputStreamReader(socket.getInputStream()));        /*标准输入输出流*/
                 writer = new PrintWriter(socket.getOutputStream());

                 while (true)
                 {

                     BufferedReader in = new BufferedReader(
                             new InputStreamReader(System.in));
                     String message = in.readLine();
                     writer.println(message);
                     writer.flush();                             /*不关闭流，清空输入缓存区*/

                     if ("finish".equals(message))
                     {
                         System.out.println("服务器已停止监听");
                         break;
                     }
                     String received = reader.readLine();
                     System.out.println(received);
                 }

                 writer.close();
                 reader.close();            /*关闭流*/
                 socket.close();

             }
             catch (UnknownHostException ex)
             {
                 ex.printStackTrace();
             }
             catch (IOException ex)
             {
                 ex.printStackTrace();       /*在命令行打印异常信息在程序中出错的位置及原因*/
             }
         }

         public static void main(String[] args)
         {
              new Client(2333);      /*绑定端口号*/
         }
     }

服务端是通过客户端的流式输入来实现监听和停止监听的。