百思不得其解的一个socket问题！
Java code//服务器端代码public class ServT { ServerSocket ss = null; List<Socket> list = null;//保存所有的连接 public ServT() { try { ss = new ServerSocket(9999); } catch (IOException e) { e.printStackTrace(); } list = new ArrayList<Socket>(); } //该内部类用来处理群发的问题 private class T implements Runnable { Socket s; List<Socket> list; public T(Socket s, List<Socket> list) { this.s = s; this.list = list; } @Override public void run() { BufferedReader br = null; PrintWriter pw = null; try { br = new BufferedReader(new InputStreamReader( s.getInputStream())); while (true) { String mesg = br.readLine(); for (int i = 0; i < list.size(); i++) { pw = new PrintWriter(list.get(i).getOutputStream()); pw.println(mesg); pw.flush(); } } } catch (IOException e) { e.printStackTrace(); } } } public void start() { Socket s; try { s = ss.accept(); list.add(s); new T(s, list); } catch (IOException e) { e.printStackTrace(); } } public static void main(String[] args) { new ServT().start(); }}//客服端代码public class Client extends JFrame implements ActionListener { JButton conn;//连接 JButton send;//发送 JTextArea jta; JTextField jtf; Socket s = null; public Client() { setTitle("qq"); setBounds(100, 100, 300, 400); JPanel jp1 = new JPanel(); add(jp1, BorderLayout.NORTH); conn = new JButton("conn"); conn.addActionListener(this); jp1.add(conn); JPanel jp2 = new JPanel(); add(jp2, BorderLayout.CENTER); jta = new JTextArea(10, 12); jp2.add(new JScrollPane(jta)); JPanel jp3 = new JPanel(); add(jp3, BorderLayout.SOUTH); jp3.setLayout(new FlowLayout()); jtf = new JTextField(10); send = new JButton("send"); send.addActionListener(this); jp3.add(jtf); jp3.add(send); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }//发送 private class T extends Thread { Socket t; String mesg; public T(Socket t, String mesg) { this.t = t; this.mesg = mesg; } public void run() { PrintWriter pw = null; try { pw = new PrintWriter(t.getOutputStream()); pw.println(mesg); pw.flush(); } catch (IOException e) { e.printStackTrace(); } } } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == send) { String mesg = jtf.getText(); new T(s, mesg).start();//发送 new TT(s).start();//开始接收 } if (e.getSource() == conn) { try { s = new Socket("127.0.0.1", 9999); } catch (Exception ee) { } } }//连接 private class TT extends Thread { Socket s; public TT(Socket s) { super(); this.s = s; } @Override public void run() { BufferedReader br = null; try { String mesg = null; br = new BufferedReader(new InputStreamReader( s.getInputStream())); while (true) { mesg = br.readLine(); jta.append(mesg + "\r"); } } catch (IOException e) { e.printStackTrace(); } finally { if (br != null) { try { br.close(); } catch (IOException e) { e.printStackTrace(); } } } } } public static void main(String[] args) { new Client(); }}