chatapplet.java

实现公聊

//ChatApplet.java   
  import   java.awt.event.*;   
  import   javax.swing.*;   
  import   java.util.*;   
  import   java.awt.*;   
  import   java.net.*;   
  import   java.io.*;   
    
  class   Customer   implements   Serializable   
  {   
  String   infoMessage   =   "";   
  String   sendMessage   =   "";   
  String   custName   =   "";   
  String   otherName=   "";   
  Vector   nameList   =   new   Vector(1,   1);   
  int   custSign   =   0;   
  }   
    
  public   class   ChatApplet   extends   JApplet   implements   ActionListener,   MouseListener   
  {   
  JPanel   loginPanel;   
  JPanel   mainPanel;   
  JPanel   chatPanel;   
    
  JLabel   labelLoginName;   
  JLabel   labelPassword;   
    
  JTextField   textLoginName;   
  JPasswordField   textPassword;   
    
  JButton   buttonLogin;   
  JButton   buttonRewrite;   
    
  GridBagLayout   gbObject;   
  GridBagConstraints   gbc;   
    
  JPanel   panel1;   
  JPanel   panel2;   
  JPanel   panel3;   
  JPanel   panel4;   
    
  JLabel   labelTitle;   
  JLabel   labelTo;   
  JLabel   labelSaid;   
  JButton   buttonSend;   
  JButton   buttonExit;   
    
  JList   listName;   
  DefaultListModel   listModel;   
  JTextArea   textMain;   
  JTextField   textName;   
  JTextField   textObject;   
    
  String   name;   
  Socket   clientSocket;   
  ObjectInputStream   in;   
  ObjectOutputStream   out;   
    
  public   void   init()   
  {   
  mainPanel   =   new   JPanel();   
  loginPanel   =   new   JPanel();   
  loginPanel.setBackground(new   Color(80,   170,   200));   
  chatPanel   =   new   JPanel();   
  chatPanel.setBackground(new   Color(160,   220,   160));   
  this.getContentPane().add(mainPanel);   
    
  mainPanel.setLayout(new   CardLayout());   
  mainPanel.add("one",   loginPanel);   
  mainPanel.add("two",   chatPanel);   
  ((CardLayout)mainPanel.getLayout()).show(mainPanel,   "one");   
    
  gbObject   =   new   GridBagLayout();   
  gbc   =   new   GridBagConstraints();   
  loginPanel.setLayout(gbObject);   
    
  labelLoginName   =   new   JLabel("Login   Name   ");   
  labelPassword   =   new   JLabel("Password   ");   
  textLoginName   =   new   JTextField(15);   
  textPassword   =   new   JPasswordField(15);   
    
  buttonLogin   =   new   JButton("Login");   
  buttonLogin.setBackground(new   Color(100,   160,   200));   
  buttonLogin.addActionListener(new   ActionListener()   
  {   
  int   type   =   JOptionPane.PLAIN_MESSAGE;   
  String   message   =   "";   
  String   title   =   "Error";   
    
  public   void   actionPerformed(ActionEvent   e)   
  {   
  if   (e.getSource()   ==   buttonLogin)   
  {   
  if   (textLoginName.getText().equals(""))   
  {   
  type   =   JOptionPane.ERROR_MESSAGE;   
  message   =   "Cannot   login   name   empty!";   
  JOptionPane.showMessageDialog(loginPanel,   message,   title,   type);   
  }   
  else   if   (new   String(textPassword.getPassword()).equals(""))   
  {   
  type   =   JOptionPane.ERROR_MESSAGE;   
  message   =   "Cannot   password   empty!";   
  JOptionPane.showMessageDialog(loginPanel,   message,   title,   type);   
  }   
  else   
  {   
  name   =   textLoginName.getText();   
  ((CardLayout)mainPanel.getLayout()).show(mainPanel,   "two");   
    
  try   
  {   
  clientSocket   =   new   Socket("127.0.0.1",   1001);   
  out   =   new   ObjectOutputStream(clientSocket.getOutputStream());   
  Customer   cust   =   new   Customer();   
  cust.custName   =   name;   
  cust.custSign   =   2;   
  out.writeObject((Customer)cust);   
  }   
  catch   (UnknownHostException   ue)   
  {   
  System.err.println("Unknown   Host   Name");   
  System.exit(0);   
  }   
  catch   (IOException   evt)   
  {   
  System.err.println("Cannot   write   to   the   server");   
  System.exit(0);   
  }   
    
  Message   message   =   new   Message();   
  message.start();   
  }   
  }   
  }   
  });   
    
  buttonRewrite   =   new   JButton("Rewrite");   
  buttonRewrite.setBackground(new   Color(100,   160,   200));   
  buttonRewrite.addActionListener(new   ActionListener()   
  {   
  public   void   actionPerformed(ActionEvent   e)   
  {   
  if   (e.getSource()   ==   buttonRewrite)   
  {   
  textLoginName.setText("");   
  textPassword.setText("");   
  }   
  }   
  });


gbc.anchor   =   GridBagConstraints.NORTHWEST;   
  gbc.gridx   =   2;   
  gbc.gridy   =   5;   
  gbObject.setConstraints(labelLoginName,   gbc);   
  loginPanel.add(labelLoginName);   
    
  gbc.gridx   =   4;   
  gbObject.setConstraints(textLoginName,   gbc);   
  loginPanel.add(textLoginName);   
    
  gbc.gridx   =   2;   
  gbc.gridy   =   8;   
  gbObject.setConstraints(labelPassword,   gbc);   
  loginPanel.add(labelPassword);   
    
  gbc.gridx   =   4;   
  gbObject.setConstraints(textPassword,   gbc);   
  loginPanel.add(textPassword);   
    
  gbc.gridx   =   2;   
  gbc.gridy   =   11;   
  gbObject.setConstraints(buttonLogin,   gbc);   
  loginPanel.add(buttonLogin);   
    
  gbc.gridx   =   4;   
  gbObject.setConstraints(buttonRewrite,   gbc);   
  loginPanel.add(buttonRewrite);   
    
  panel1   =   new   JPanel();   
  panel1.setBackground(new   Color(160,   220,   160));   
  panel2   =   new   JPanel();   
  panel2.setBackground(new   Color(160,   220,   160));   
  panel3   =   new   JPanel();   
  panel3.setBackground(new   Color(150,   180,   220));   
  panel4   =   new   JPanel();   
  panel4.setBackground(new   Color(160,   220,   160));   
    
  textMain   =   new   JTextArea(20,   87);   
  textMain.setEditable(false);   
  textMain.setLineWrap(true);   
  textMain.setFont(new   Font("宋体",   Font.PLAIN,   14));   
  JScrollPane   textChat   =   new   JScrollPane(textMain);   
    
  listModel   =   new   DefaultListModel();   
  listName   =   new   JList(listModel);   
  listName.setFont(new   Font("宋体",   Font.PLAIN,   14));   
  listName.setVisibleRowCount(22);   
  listName.setFixedCellWidth(160);   
  listName.setFixedCellHeight(25);   
  JScrollPane   list   =   new   JScrollPane(listName);   
  panel4.add(list);   
  listName.addMouseListener(this);   
    
  textName   =new   JTextField(8);   
  textName.setEditable(false);   
  textName.setText("everybody");   
    
  textObject   =   new   JTextField(40);   
  textObject.addKeyListener(new   KeyAdapter()   
  {   
  public   void   keyPressed(KeyEvent   e)   
  {   
  if   (e.getKeyCode()   ==   KeyEvent.VK_ENTER)   
  {   
  buttonSend.doClick();   
  }   
  }   
  });   
    
  labelTitle   =   new   JLabel("   CHAT   ROOM   ");   
  labelTitle.setFont(new   Font("Arial   Black",   Font.PLAIN,   25));   
    
  labelTo   =   new   JLabel("To");   
  labelSaid   =   new   JLabel("Said");   
    
  buttonSend   =   new   JButton("Send");   
  buttonSend.setBackground(new   Color(160,   220,   160));   
  buttonSend.addActionListener(this);   
    
  buttonExit   =   new   JButton("Exit");   
  buttonExit.setBackground(new   Color(160,   220,   160));   
  buttonExit.addActionListener(this);   
    
  chatPanel.setLayout(new   BorderLayout(5,   10));   
  chatPanel.add(panel1,   BorderLayout.SOUTH);   
  panel1.setLayout(new   FlowLayout(FlowLayout.LEFT));   
  panel1.add(labelTo);   
  panel1.add(textName);   
  panel1.add(labelSaid);   
  panel1.add(textObject);   
  panel1.add(buttonSend);   
  panel1.add(buttonExit);   
    
  chatPanel.add(panel3,   BorderLayout.NORTH);   
  panel3.setLayout(new   FlowLayout());   
  panel3.add(labelTitle);   
    
  chatPanel.add(panel2,   BorderLayout.CENTER);   
  panel2.setLayout(new   BorderLayout(10,   15));   
  panel2.add("East",   textChat);   
  panel2.add("Center",   panel4);   
  }   
    
  public   void   mouseEntered(MouseEvent   e){}   
  public   void   mouseExited(MouseEvent   e){}   
  public   void   mousePressed(MouseEvent   e){}   
  public   void   mouseReleased(MouseEvent   e){}   
    
  public   void   mouseClicked(MouseEvent   e)   
  {   
  String   temp;   
  int   index;   
    
  if   (e.getSource()   ==   listName)   
  {   
  if   (e.getClickCount()   ==   2)   
  {   
  index   =   listName.locationToIndex(e.getPoint());   
  temp   =   (String)listModel.getElementAt(index);   
  textName.setText(temp);   
  }   
  }   
  }   
    
  public   void   actionPerformed(ActionEvent   e)   
  {   
  Customer   cust1   =   new   Customer();   
    
  if   (e.getSource()   ==   buttonSend)   
  {   
  try   
  {   
  cust1.otherName   =   textName.getText();   
  cust1.custSign   =   1;   
  cust1.custName   =   name;   
  cust1.sendMessage   =   textObject.getText();   
  out.writeObject((Customer)cust1);   
  textObject.setText("");   
  }   
  catch(Exception   e1)   
  {}   
  }   
    
  if   (e.getSource()   ==   buttonExit)   
  {   
  int   type   =   JOptionPane.PLAIN_MESSAGE;   
  String   message   =   "";   
  String   title   =   "exit";   
    
  try   
  {   
  cust1.custSign   =   3;   
  cust1.custName   =   name;   
  out.writeObject((Customer)cust1);   
  clientSocket.close();   
  type   =   JOptionPane.INFORMATION_MESSAGE;   
  message   =   "You   quit   chat   room!";   
  JOptionPane.showMessageDialog(loginPanel,   message,   title,   type);   
  System.exit(0);   
  }   
  catch(Exception   evt)   
  {}   
  }   
  }   
    
  class   Message   extends   Thread   
  {   
  public   void   run()   
  {   
  while   (true)   
  {   
  try   
  {   
  String   name;   
  String   message;   
  in   =   new   ObjectInputStream(clientSocket.getInputStream());   
  Customer   temp   =   (Customer)in.readObject();   
    
  if   (temp.custSign   ==   1)   
  {   
  name   =   temp.custName;   
  message   =   temp.sendMessage;   
  textMain.append("<"   +   name   +   ">"   +   "   said   to   "   +   "<"   +   temp.otherName   +   ">   "   +   message   +   "\n");   
  textMain.setCaretPosition(textMain.getDocument().getLength());   
  }   
    
  if   (temp.custSign   ==   2   ||   temp.custSign   ==   3)   
  {   
  listModel.clear();   
  listModel.addElement("everybody");   
    
  for   (int   i   =   0;   i   <   temp.nameList.size();   i++   )   
  {   
  String   onlineName;   
  onlineName   =   (String)   temp.nameList.elementAt(i);   
  listModel.addElement(onlineName);   
  System.out.println(onlineName);   
  }   
    
  textMain.append(temp.infoMessage   +   "\n");   
  textMain.setCaretPosition(textMain.getDocument().getLength());   
  }   
    
  if   (temp.custSign   ==   4)   
  {   
  textMain.append(temp.sendMessage   +   "\n");   
  textMain.setCaretPosition(textMain.getDocument().getLength());   
  }   
  }   
  catch(Exception   e)   
  {}   
  }   
  }   
  }   
    
  public   void   destroy()   
  {   
  int   type   =   JOptionPane.PLAIN_MESSAGE;   
  String   message   =   "";   
  String   title   =   "exit";   
    
  try   
  {   
  Customer   cust1   =   new   Customer();   
  cust1.custSign   =   3;   
  cust1.custName   =   name;   
  out.writeObject((Customer)cust1);   
  type   =   JOptionPane.INFORMATION_MESSAGE;   
  message   =   "You   quit   chat   room!";   
  JOptionPane.showMessageDialog(loginPanel,   message,   title,   type);   
  clientSocket.close();   
  }   
  catch(Exception   e)   
  {}   
  }   
  }