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线程一章有个聊天程序，我运行之后客户端没将服务器的内容显示在JTextArea中，求解答

客户端程序

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import java.net.*;

public class SimpleChatClientA {

JTextArea incoming;

JTextField outgoing;

BufferedReader reader;

PrintWriter writer;

Socket sock;

public void go(){

JFrame frame = new JFrame("Ludicrously Simple Chat Client");

JPanel mainPanel = new JPanel();

incoming = new JTextArea(15,50);

incoming.setLineWrap(true);

incoming.setWrapStyleWord(true);

incoming.setEditable(false);

JScrollPane qScroller = new JScrollPane(incoming);

qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

outgoing = new JTextField(20);

JButton sendButton = new JButton("send");

sendButton.addActionListener(new SendButtonListener());

mainPanel.add(qScroller);

mainPanel.add(outgoing);

mainPanel.add(sendButton);

Thread readerThread = new Thread(new IncomingReader());

readerThread.start();

frame.getContentPane().add(BorderLayout.CENTER, mainPanel);

setUpNetworking();

frame.setSize(400,500);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private void setUpNetworking(){

try{

sock = new Socket("127.0.0.1",5000);

InputStreamReader streamReader = new InputStreamReader(sock.getInputStream());

reader = new BufferedReader(streamReader);

writer = new PrintWriter(sock.getOutputStream());

System.out.println("networking established");

}catch(IOException ex){

ex.printStackTrace();

}

}

public class SendButtonListener implements ActionListener{

public void actionPerformed(ActionEvent ev){

try{

writer.println(outgoing.getText());

writer.flush();

}catch(Exception ex){

ex.printStackTrace();

}

outgoing.setText("");

outgoing.requestFocus();

}

}

public class IncomingReader implements Runnable{

public void run(){

String message;

try{

while((message = reader.readLine())!=null){

System.out.println("read "+message);

incoming.append(message+"\n");

}

}catch(Exception ex){

ex.printStackTrace();

}

}

}

public static void main(String[] args){

new SimpleChatClientA().go();

}

}

服务器程序

import java.io.*;

import java.net.*;

import java.util.*;

public class VerySimpleChatServer {

ArrayList clientOutputStreams;

public class ClientHandler implements Runnable{

BufferedReader reader;

Socket sock;

public ClientHandler(Socket clientSocket){

try{

sock = clientSocket;

InputStreamReader isReader = new InputStreamReader(sock.getInputStream());

reader = new BufferedReader(isReader);

}catch(Exception ex){

ex.printStackTrace();

}

}

public void run(){

String message;

try{

while((message = reader.readLine())!=null){

System.out.println("read $"+message);

tellEveryone(message);

}

}catch(Exception ex){

ex.printStackTrace();

}

}

}

public static void main(String[] args){

new VerySimpleChatServer().go();

}

public void go(){

clientOutputStreams = new ArrayList();

try{

ServerSocket serverSock = new ServerSocket(5000);

while(true){

Socket clientSocket = serverSock.accept();

PrintWriter writer = new PrintWriter(clientSocket.getOutputStream());

clientOutputStreams.add(writer);

Thread t = new Thread(new ClientHandler(clientSocket));

t.start();

System.out.println("got a connection");

}

}catch(Exception ex){

ex.printStackTrace();

}

}

public void tellEveryone(String message){

Iterator it = clientOutputStreams.iterator();

while(it.hasNext()){

try{

PrintWriter writer = (PrintWriter) it.next();

writer.println(message);

writer.flush();

}catch(Exception ex){

ex.printStackTrace();

}

}

}

}