求各位帮忙 服务端群发问题 急！！！！

[bigLite]

大家好：
我现在编写了下面五个类，但是Server类和Client类只能点对点的发送，也就是说能多个客户端向服务器发送，但服务器只能向最后那一个进来的客户端发送，我想当服务端发送时所有客户端都能接收到怎么处理，五个类分别如下：（Server Client SocketPerform Receiver Sender）
五个类的关系如下：
使用单独的二个类Receiver和Sender负责对指定的输入及输出流进行操作，用另一个类SocketPerformer来创建Receiver和Sender这两个类的实例，并传入指定的输入及输出流，而在Client及Server这两个类中，负责创建SocketPerformer对象，并传入指定的Socket。因此这五个类在功能上分为三层，第一层负责对流进行操作，第二层负责创建指定的Socket流，并这些Socket流传到第一层，第三层负责创建Socket并将这些Socket传到第二层。
麻烦大家看看：先谢谢 如果大家有关于聊天的代码，如果方便给我发一份，小弟感激不尽！！！！！
我的邮箱：[e-mail] qq:33762274

Receiver代码：
import java.io.BufferedReader;
public class Receiver extends Thread
{
BufferedReader reader;
public Receiver(BufferedReader theSocketReader)
{
reader = theSocketReader;
}
public void run()
{
while (true)
{
try
{
String words = reader.readLine();
System.out.println("\r\n<<< " + words);
}
catch (Exception e)
{
e.printStackTrace();
return;
}
}
}
}
Sender代码：
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class Sender extends Thread
{
PrintWriter writer=null;
public Sender(PrintWriter socketWriter)
{
writer=socketWriter;
}
public void run()
{
while(true)
{
try
{
BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
String words=reader.readLine();
if(words.equals("exit"))
{
reader.close();
System.exit(1);
}
writer.write(words+"\r\n");
writer.flush();
}
catch(Exception e)
{
e.printStackTrace();
return;

}
}

}
}
SocketPerform 代码
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class SocketPerform
{
Socket socket;
public SocketPerform(Socket theSocket) {
socket=theSocket;
}
public void execute() throws Exception
{
BufferedReader socketReader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter socketWriter=new PrintWriter(socket.getOutputStream());
System.out.println("connection built !");
Receiver rc=new Receiver(socketReader);
rc.start();
Sender sd=new Sender(socketWriter);
sd.start();


}
}
Server 代码
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
public Server() {
}
public static void main(String[] args) throws Exception
{

ServerSocket server=new ServerSocket(30000,5);
System.out.println("waiting incoming connection...");
while(true)
{
Socket socket = server.accept();
System.out.println("a connection built!");
System.out.println("the peer ip is: " + socket.getInetAddress().getHostAddress());
System.out.println("the peer ip is: "+socket.getLocalAddress().getHostAddress());
String acceptIp=socket.getInetAddress().getHostAddress();
new SocketPerform(socket).execute();
//server.close();
}
}

}
Client 代码
import java.net.Socket;
import java.net.InetAddress;

import java.net.ServerSocket;

public class Client {
public Client() {
}
public static void main(String[] args) throws Exception
{
String ip="10.71.8.100";
int port=30000;
Socket socket=null;

//ip=ServerSocket(int port, int backlog, InetAddress bindAddr)
//socket=new Socket(ip,port,InetAddress.getLocalHost(),20);
socket=new Socket(ip,port);
new SocketPerform(socket).execute();

}
}

[grapepaul]

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[dabinglian]

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