java聊天室代码
import java.awt.*;
import javax.swing.border.*;
import java.net.*;
import javax.swing.*;
import java.awt.event.*;

/**
 * 生成连接信息输入的对话框
 * 让用户输入连接服务器的IP和端口
 */
public class ConnectConf extends JDialog {
 JPanel panelUserConf = new JPanel();
 JButton save = new JButton();
 JButton cancel = new JButton();
 JLabel DLGINFO=new JLabel(
  "                  默认连接设置为  127.0.0.1:8888");

 JPanel panelSave = new JPanel();
 JLabel message = new JLabel();

 String userInputIp;
 int userInputPort;

 JTextField inputIp;
 JTextField inputPort;

 public ConnectConf(JFrame frame,String ip,int port) {
  super(frame, true);
  this.userInputIp = ip;
  this.userInputPort = port;
  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 + 50,
      (int) (screenSize.height - 600) / 2 + 150);
  this.setResizable(false);
 }

 private void jbInit() throws Exception {
  this.setSize(new Dimension(300, 130));
  this.setTitle("连接设置");
  message.setText(" 请输入服务器的IP地址:");
  inputIp = new JTextField(10);
  inputIp.setText(userInputIp);
  inputPort = new JTextField(4);
  inputPort.setText(""+userInputPort);
  save.setText("保存");
  cancel.setText("取消");

  panelUserConf.setLayout(new GridLayout(2,2,1,1));
  panelUserConf.add(message);
  panelUserConf.add(inputIp);
  panelUserConf.add(new JLabel(" 请输入服务器的端口号:"));
  panelUserConf.add(inputPort);

  panelSave.add(new Label("              "));
  panelSave.add(save);
  panelSave.add(cancel);
  panelSave.add(new Label("              "));

  Container contentPane = getContentPane();
  contentPane.setLayout(new BorderLayout());
  contentPane.add(panelUserConf, BorderLayout.NORTH);
  contentPane.add(DLGINFO, BorderLayout.CENTER);
  contentPane.add(panelSave, BorderLayout.SOUTH);

  //保存按钮的事件处理
  save.addActionListener(
   new ActionListener() {
    public void actionPerformed (ActionEvent a) {
     int savePort;
     String inputIP;
     //判断端口号是否合法
     try{
      userInputIp = "" + InetAddress.getByName(inputIp.getText());
      userInputIp = userInputIp.substring(1);
     }
     catch(UnknownHostException e){
      DLGINFO.setText(
       "                                    错误的IP地址！");

      return;
     }
     //userInputIp = inputIP;

     //判断端口号是否合法
     try{
      savePort = Integer.parseInt(inputPort.getText());

      if(savePort<1 || savePort>65535){
       DLGINFO.setText("               侦听端口必须是0-65535之间的整数!");
       inputPort.setText("");
       return;
      }
      userInputPort = savePort;
      dispose();
     }
     catch(NumberFormatException e){
      DLGINFO.setText("                错误的端口号,端口号请填写整数!");
      inputPort.setText("");
      return;
     }
    }
   }
  );

  //关闭对话框时的操作
  this.addWindowListener(
   new WindowAdapter(){
    public void windowClosing(WindowEvent e){
     DLGINFO.setText("                  默认连接设置为  127.0.0.1:8888");
    }
   }
  );

  //取消按钮的事件处理
  cancel.addActionListener(
   new ActionListener(){
    public void actionPerformed(ActionEvent e){
     DLGINFO.setText("                  默认连接设置为  127.0.0.1:8888");
     dispose();
    }
   }
  );
 }
}

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