简易局域网QQ聊天器代码实现

客户端: 
import   javax.swing.*; 
import   java.awt.event.*; 
import   java.io.*; 
import   java.net.*; 
import   java.awt.*; 

public   class   ClientPoint   extends   JFrame   implements   ActionListener,KeyListener{ 
    static   int   SERVERPORT=8088; 
    static   String   SERVERADDRESS= "127.0.0.1 "; 
    private   BufferedReader   cin=null; 
    private   PrintWriter   cout=null; 
    private   Socket   client=null; 
    public   String   clientname; 
    private   JPanel   jPanel1=new   JPanel(); 
    private   JTextField   jTextSendInfo=new   JTextField(38); 
    private   JTextArea   jTextGetInfo=new   JTextArea(16,33);     
    public   JScrollPane   areaScrollPane=new   JScrollPane(jTextGetInfo);     
    private   Button   Send=new   Button( "发送 "); 
    private   Button   Link=new   Button( "连接 "); 
    
    public   ClientPoint(){     
        super( "聊天室^_^ ");         
      enableEvents(AWTEvent.WINDOW_EVENT_MASK);         
        setSize(480,465); 
        jPanel1.add( "South ",jTextSendInfo); 
        jPanel1.setBackground(new   Color(75,   234,   166)); 
jTextGetInfo.setBackground(new   Color(122,150,223)); 
        jTextGetInfo.setFont(new   java.awt.Font( "Dialog ",   0,   15)); 
        jTextGetInfo.setForeground(new   Color(176,   42,   0)); 

        this.setResizable(false); 
        Send.setBackground(Color.pink); 
        Send.setForeground(Color.blue); 
        Send.setBounds(new   Rectangle(92,   400,   90,   37)); 
        Link.setBackground(Color.pink); 
        Link.setForeground(Color.blue);       
        areaScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 
        areaScrollPane.setAutoscrolls(true); 
      jTextSendInfo.setText( " "); 
        jPanel1.add( "North ",areaScrollPane); 
        jTextGetInfo.setEditable(false); 
        jPanel1.add( "South ",Send); 
        Send.setEnabled(false); 
        jPanel1.add( "South ",Link); 
        Send.addActionListener(this); 
jTextSendInfo.addKeyListener(this); 
        Link.addActionListener(new   ActionListener() 
                    {public   void   actionPerformed(ActionEvent   e){ 
                    if(!jTextSendInfo.getText().equals( " ")){ 
                            clientname=jTextSendInfo.getText(); 
                            connect();                           
                            Link.setEnabled(false); 
                            Send.setEnabled(true); 
                            jTextSendInfo.setText( " "); 
                    } 
                    else   JOptionPane.showMessageDialog(null, "警告：用户名不能为空！！ ", "消息对话框 ",JOptionPane.WARNING_MESSAGE); 
                    }}); 
        this.setContentPane(jPanel1); 
    } 
    public   void   connect(){