/**
 * 生成设置对话框的类
 */
public class Help extends JDialog {
 JPanel titlePanel = new JPanel();
 JPanel contentPanel = new JPanel();
 JPanel closePanel = new JPanel();
 JButton close = new JButton();
 JLabel title = new JLabel("聊天室服务端帮助");
 JTextArea help = new JTextArea(); 
Color bg = new Color(255,255,255);
 public Help(JFrame frame) {
  super(frame, true);
  try {
   jbInit();
  }
  catch (Exception e) {
   e.printStackTrace();
  }
  //设置运行位置,使对话框居中
  Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
  this.setLocation( (int) (screenSize.width - 400) / 2,
      (int) (screenSize.height - 320) / 2);
  this.setResizable(false);
 }
 private void jbInit() throws Exception {
  this.setSize(new Dimension(400, 200));
  this.setTitle("帮助");
  
  titlePanel.setBackground(bg);;
  contentPanel.setBackground(bg);
  closePanel.setBackground(bg);
  
  help.setText("1、设置服务端的侦听端口(默认端口为8888)。\n"+
   "2、点击 启动服务 按钮便可在指定的端口启动服务。\n"+
   "3、选择需要接受消息的用户,在消息栏中写入消息,之后便可发送消息。\n"+
   "4、信息状态栏中显示服务器当前的启动与停止状态、"+
   "用户发送的消息和\n      服务器端发送的系统消息。");
  help.setEditable(false);
  titlePanel.add(new Label("              "));
  titlePanel.add(title);
  titlePanel.add(new Label("              "));
contentPanel.add(help);
  closePanel.add(new Label("              "));
  closePanel.add(close);
  closePanel.add(new Label("              "));
  Container contentPane = getContentPane();
  contentPane.setLayout(new BorderLayout());
  contentPane.add(titlePanel, BorderLayout.NORTH);
  contentPane.add(contentPanel, BorderLayout.CENTER);
  contentPane.add(closePanel, BorderLayout.SOUTH);
  close.setText("关闭");
  //事件处理
  close.addActionListener(
   new ActionListener() {
    public void actionPerformed(ActionEvent e) {
     dispose();
    }
   }
  );
 }
}
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