我想实现书中的两个例子可是。。。
请不要烦帮忙改改，如果有socket方面的例子谢谢给一个！！！
程序：

import java.io.*;
import java.net.*;

public class SimpleClient extends Object implements Runnable//, ReadCallback
{
       protected Socket serverSock;
       protected DataOutputStream outStream;
       protected Thread clientThread;
       protected ReadThread reader;

       public SimpleClient(String hostName, int portNumber)
       throws IOException
       {
         serverSock = new Socket(hostName, portNumber);
          outStream = new DataOutputStream(serverSock.getOutputStream());
          reader = new ReadThread(this.serverSock);
          reader.start();
       }

       public void start()
       {
          clientThread = new Thread(this);
          clientThread.start();
       }

       public void stop()
       {
          clientThread.stop();
          clientThread = null;
       }
       public synchronized void sendString(String str)
       throws IOException
       {
          System.out.println("Sending string:" +str);
          outStream.writeUTF(str);
       }
       public void run()
       {
          while(true)
          {
             try{
                   sendString("Hello There!");
                   Thread.sleep(2000);
                 }catch(Exception oops) {
                  oops.printStackTrace(); 
                  disconnect();
                  stop();
                }
           }
         }
     
         public void disconnect()
         {
            try{
                  reader.closeConnection();
               }catch(Exception badClose){
              }
         }
   
         public synchronized void dataReady(String str)
         {
            System.out.println("Got incoming string:"+ str);
          }
         public static void main(String[] args)
         {
            try{
                SimpleClient client = new SimpleClient("localhost", 4331);
                client.start();
              }catch(Exception cantStart) {
               System.out.println("Got error");
               cantStart.printStackTrace();
          }
      }
}
//////////////////////////////////////////////////
错误：
C:j2sdk1.4.0_01bin>javac SimpleClient.java
SimpleClient.java:9: cannot resolve symbol
symbol  : class ReadThread
location: class SimpleClient
       protected ReadThread reader;
                 ^
SimpleClient.java:16: cannot resolve symbol
symbol  : class ReadThread
location: class SimpleClient
          reader = new ReadThread(this.serverSock);
                       ^
Note: SimpleClient.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.
2 errors

/////////////////////////////////////////服务器/////////////////
程序：
import java.io.*;
import java.net.*;

public class ServerConn extends Object implements ReadCallback
{
   protected SimpleServer server;
   protected Socket clientSock;
   protected ReadThread reader;
   protected DataOutputStream outStream;
 
   public ServerConn(SimpleServer server, Socket clientSock)
   throws IOException
   {
      this.server = server;
      this.clientSock = clientSock;
      outStream = new DataOutputStream(clientSock.getOutputStream());
      reader = new ReadThread(this, clientSock);
      reader.start();
   }

   public synchronized void dataReady(String str)
   {
      if(str == null)
      {
         disconnect();
         return;
      }
      try{
          outStream.writeUTF(server.processString(str));
         }catch(Exception writeError){
            writeError.printStackTrace();
            disconnect();
            return;
         }
    }
    public synchronized void disconnect()
    {
       try{
            reader.closeConnection();
          }catch(Exception cantclose){
            reader.stop();
          }
     }
}
//////////////////////////////////////////
错误：
public class ServerConn extends Object implements ReadCallback
                                                  ^
ServerConn.java:6: cannot resolve symbol
symbol  : class SimpleServer
location: class ServerConn
   protected SimpleServer server;
             ^
ServerConn.java:8: cannot resolve symbol
symbol  : class ReadThread
location: class ServerConn
   protected ReadThread reader;
             ^
ServerConn.java:11: cannot resolve symbol
symbol  : class SimpleServer
location: class ServerConn
   public ServerConn(SimpleServer server, Socket clientSock)
                     ^
ServerConn.java:17: cannot resolve symbol
symbol  : class ReadThread
location: class ServerConn
      reader = new ReadThread(this, clientSock);
                   ^
5 errors

你的例程是错的，我根据你的第一个例程进行了完善，虽然不够
完整，但已经可以编译运行了：

//##################################################
//  file: SimpleClient.java
//
import java.io.*;
import java.net.*;

public class SimpleClient extends Object implements Runnable   //, ReadCallback
{

       protected Socket serverSock;

       protected DataOutputStream outStream;
       protected Thread clientThread;
       protected ReadThread reader;

// --------------------------------------------------

class ReadThread extends Thread{

ServerSocket s;

Socket serverSock;

DataInputStream input;
String str;

int portnum;

public ReadThread(int port) throws IOException{
portnum = port;
s = new ServerSocket(portnum);
}

                public void closeConnection(){
try {
serverSock.close();
} catch (IOException ex) {
}

return;
}


public void start() 
{
try {
serverSock = s.accept();
input = new DataInputStream(serverSock.getInputStream());

} catch (IOException ex) {
System.err.println("Read nothing from client.");
this.stop();
}

while (true){
try {
str = new String(input.readUTF());
} catch (IOException ex) {
System.err.println("Cannot read input:"+ex.toString());
this.stop();
}

System.out.println("Server - "+str);
}
}
}

// ------------------------------------------------------------
      
       public SimpleClient(String hostName, int portNumber)
       throws IOException
       {

          reader = new ReadThread(portNumber);

          serverSock = new Socket(InetAddress.getLocalHost(), portNumber);

          outStream = new DataOutputStream(serverSock.getOutputStream());
       }

       public void start()
       {
          clientThread = new Thread(this);
          clientThread.start();
          reader.start();
       }

       public void stop()
       {
          clientThread.stop();
          clientThread = null;
       }
       public synchronized void sendString(String str)
       throws IOException
       {
          System.out.println("Client - Sending string:" +str);
          outStream.writeUTF(str);
       }
       public void run()
       {
          while(true)
          {
             try{
                   sendString("Hello There!");
                   Thread.sleep(2000);
                 }catch(Exception oops) {
                  oops.printStackTrace(); 
                  disconnect();
                  stop();
                }
           }
         }
     
         public void disconnect()
         {
            try{
                  reader.closeConnection();
               }catch(Exception badClose){
              }
         }
   
         public synchronized void dataReady(String str)
         {
            System.out.println("Got incoming string:"+ str);
          }
         public static void main(String[] args)
         {
            try{
                SimpleClient client = new SimpleClient("localhost", 2525);
                client.start();
            } catch(Exception cantStart) {
System.out.println("Got error");
cantStart.printStackTrace();
    }
}
}

你这里缺东西吧
这个应该是个读数据ReadThred()类找不到你这里没有
你在看看书上找一下这个类就可以了

ReadThread 是什么啊，好象是没有找到这个类

java的socket方面的东西网上很多，还是去下载一些下来看看,再往下走。

ReadThread 的代码可能在书的其他地方，你在找找

client 和 server 程序放在一起吗？server程序是自动运行的吗？

哈，我是个菜鸟，知道客户端是小程序，可以通过浏览器运行，
可服务器端的是application呀，就放在那里不用管它？