java编写聊天室
import java.awt.*;
import javax.swing.border.*;
import java.net.*;
import javax.swing.*;
import java.awt.event.*;

/**
 * 生成用户信息输入对话框的类
 * 让用户输入自己的用户名
 */
public class UserConf extends JDialog {
 JPanel panelUserConf = new JPanel();
 JButton save = new JButton();
 JButton cancel = new JButton();
 JLabel DLGINFO=new JLabel(
  "                         默认用户名为：匆匆过客");

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

 JTextField userName ;

 public UserConf(JFrame frame,String str) {
  super(frame, true);
  this.userInputName = str;
  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, 120));
  this.setTitle("用户设置");
  message.setText("请输入用户名:");
  userName = new JTextField(10);
  userName.setText(userInputName);
  save.setText("保存");
  cancel.setText("取消");

  panelUserConf.setLayout(new FlowLayout());
  panelUserConf.add(message);
  panelUserConf.add(userName);

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

  Container contentPane = getContentPane();
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   new ActionListener() {
    public void actionPerformed (ActionEvent a) {
     if(userName.getText().equals("")){
      DLGINFO.setText(
       "                                 用户名不能为空！");
      userName.setText(userInputName);
      return;
     }
     else if(userName.getText().length() > 15){
      DLGINFO.setText("                    用户名长度不能大于15个字符！");
      userName.setText(userInputName);
      return;
     }
     userInputName = userName.getText();
     dispose();
    }
   }
  );

  //关闭对话框时的操作
  this.addWindowListener(
   new WindowAdapter(){
    public void windowClosing(WindowEvent e){
     DLGINFO.setText("                         默认用户名为：匆匆过客");
    }
   }
  );

  //取消按钮的事件处理
  cancel.addActionListener(
   new ActionListener(){
    public void actionPerformed(ActionEvent e){
     DLGINFO.setText("                         默认用户名为：匆匆过客");
     dispose();
    }
   }
  );
 }
}

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