用Socket实现client和Server的问题
我们老师要我们写一个用Socket实现client和Server的作业
现在上网找了点代码
能实现客户端向服务器端发送消息
但只能是一个。。
我对线程认识太少了
希望各位帮我改改
实现服务端一直监听 就是说客户端随时发信息服务器都能应答（以下程序只能服务端返回一次信息）


客户端:

Java code

package test.bwl;     import java.io.BufferedReader;import java.io.DataInputStream;   import java.io.DataOutputStream;   import java.io.IOException;   import java.io.InputStreamReader;import java.io.OutputStream;   import java.net.Socket;   import java.net.UnknownHostException;     public class SocketClient {         public static void main(String[] args) {           Socket socket = null;         DataOutputStream doc;         DataInputStream in ;         try {               socket = new Socket("127.0.0.1", 1234);               OutputStream netOut = socket.getOutputStream();               doc = new DataOutputStream(netOut);               in = new DataInputStream(socket.getInputStream());               BufferedReader br=new BufferedReader(new InputStreamReader(System.in));            int flag=1;            doc = new DataOutputStream(netOut);               in = new DataInputStream(socket.getInputStream());             while(flag==1)            {                  System.out.print("请输入要发送的内容(输入exit退出)\n");                String what=br.readLine();                if("exit".equals(what))                    break;                doc.writeUTF(what);                   String res = in.readUTF();                 System.out.println("客户端--->"+res);               }            doc.close();               in.close();        } catch (UnknownHostException e) {               e.printStackTrace();           } catch (IOException e) {               e.printStackTrace();           } finally {               if (socket != null) {                   try {                    socket.close();                     System.out.println("关闭成功");                } catch (IOException e) {                   }               }           }       }   }  

Java code

package test.bwl;     import java.io.DataInputStream;   import java.io.DataOutputStream;   import java.io.IOException;   import java.net.ServerSocket;   import java.net.Socket;     public class SocketManager {       /**       * @param args       * @throws IOException        */      public static void main(String[] args) {           SocketManager manager = new SocketManager();        System.out.println("启动监听.....");        manager.doListen();            }         public void doListen() {           ServerSocket server;           try {               server = new ServerSocket(1234);               while (true) {                   Socket client = server.accept();                   new Thread(new SSocket(client)).start();               }           } catch (IOException e) {               e.printStackTrace();           }         }         //服务器进程       class SSocket implements Runnable {             Socket client;             public SSocket(Socket client) {               this.client = client;           }             public void run() {                        DataInputStream input;               DataOutputStream output;               try {                                  input = new DataInputStream(client.getInputStream());                   output = new DataOutputStream(client.getOutputStream());                   String listMsg = input.readUTF();                   output.writeUTF("服务器接收-->发回: " + listMsg );                   System.out.println("接收:   " + listMsg);                 } catch (Exception e) {                   e.printStackTrace();               }           }       }     }  

[解决办法]
在run方法里面写一个死循环不就行了嘛。
[解决办法]
http://blog.csdn.net/thegodofwar/archive/2010/08/12/5808206.aspx
看看这个，我写的