聊天室提供Java传送文件功能。

简介：
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(); }}