Dimension ss = Toolkit.getDefaultToolkit().getScreenSize(); public ChatClient(){ super("登录聊天室"); pnlLogin = new JPanel(); this.getContentPane().add(pnlLogin); lblServer = new JLabel("服务器:"); lblPort = new JLabel("端口:"); lblName = new JLabel("用户名:"); lblPassword = new JLabel("口 令:"); tfServer = new JTextField(15); tfServer.setText("127.0.0.1"); tfPort = new JTextField(6); tfPort.setText("8000"); tfName = new JTextField(20); pwd = new JPasswordField(20); btnLogin = new JButton("登录"); btnRegister = new JButton("注册"); btnExit=new JButton("退出"); pnlLogin.setLayout(null); pnlLogin.setBackground(new Color(205,112,159)); lblServer.setBounds(40,35,50,30); tfServer.setBounds(90,35,102,25); lblPort.setBounds(195,35,35,30); tfPort.setBounds(230,35,55,25); lblName.setBounds(40,70,50,30); tfName.setBounds(90,70,195,25); lblPassword.setBounds(40,100,50,30); pwd.setBounds(90,100,195,25); btnLogin.setBounds(30,160,70,25); btnRegister.setBounds(130,160,70,25); btnExit.setBounds(230,160,70,25); pnlLogin.add(lblServer); pnlLogin.add(tfServer); pnlLogin.add(lblPort); pnlLogin.add(tfPort); pnlLogin.add(lblName); pnlLogin.add(tfName); pnlLogin.add(lblPassword); pnlLogin.add(pwd); pnlLogin.add(btnLogin); pnlLogin.add(btnRegister); pnlLogin.add(btnExit); //设置登录窗口 setResizable(false); setSize(320,260); setVisible(true); setLocation((ss.width-getWidth())/2,(ss.height-getHeight())/2); //为按钮注册监听 btnLogin.addActionListener(this); btnRegister.addActionListener(this); btnExit.addActionListener(this); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ System.exit(0); } }); } //按钮监听响应 public void actionPerformed(ActionEvent ae){ Object source = ae.getSource(); if (source.equals(btnLogin)){ if (tfName.getText().equals("") || pwd.getPassword().equals("")) JOptionPane.showMessageDialog(null, "用户名或密码不能为空"); else strServerIp = tfServer.getText(); login(); } if (source.equals(btnRegister)){ strServerIp = tfServer.getText(); this.dispose(); new Register(strServerIp,8000); } if (source == btnExit) { System.exit(0); } } public void login() { User data = new User(); data.name = tfName.getText(); data.password = new String(pwd.getPassword()); try { String str = InetAddress.getLocalHost().toString(); data.ip = " "+ str.substring(str.lastIndexOf("/"), str.length()); } catch (UnknownHostException ex) { Logger.getLogger(ChatClient.class.getName()).log(Level.SEVERE, null, ex); } try{ Socket sock = new Socket(strServerIp,8000); ObjectOutputStream os = new ObjectOutputStream(sock.getOutputStream()); os.writeObject((User) data); //读来自服务器socket的登录状态 BufferedReader br = new BufferedReader(new InputStreamReader(sock.getInputStream())); String status = br.readLine(); if (status.equals("登陆成功")){ new ChatRoom((String)data.name,strServerIp); this.dispose(); //关闭流对象 os.close(); br.close(); sock.close(); } else{ JOptionPane.showMessageDialog(null, status); os.close(); br.close(); sock.close(); } } catch (ConnectException e1){ JOptionPane.showMessageDialog(null, "连接到制定服务器失败！"); } catch (InvalidClassException e2) { JOptionPane.showMessageDialog(null, "类错误!"); } catch (NotSerializableException e3) { JOptionPane.showMessageDialog(null, "对象未序列化!"); } catch (IOException e4) { JOptionPane.showMessageDialog(null, "不能写入到指定服务器!"); } } public static void main(String arg[]){ new ChatClient(); } }