java实现GUI登录界面

package cn.lys.main;  //包名，截取代码使用需删除import javax.swing.*;   
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;
public class Components extends JFrame{
/**
 * 
 */
private JPanel jp1,jp2,jp3;  //定义面板
private JLabel User,Password;  //定义用户名和密码标签
private JTextField user;  //定义文本类型的用户名
private JPasswordField passwordField; //定义密码
private JButton jb1,jb2,jb3;  //定义三个按钮
public Components(){                    //创建相应对象
jp1 = new JPanel(new BorderLayout());   //布局  
jp2 = new JPanel(new GridLayout(3,3));
jp3 = new JPanel();

User = new JLabel("用户名：");
Password = new JLabel("密码：");


user = new JTextField();
passwordField = new JPasswordField();

jb1 = new JButton("登录");
jb2 = new JButton("注册");
jb3 = new JButton("取消");
//添加相应组件
jp3.add(jb1);
jp3.add(jb2);
jp3.add(jb3);

jp2.add(User);
jp2.add(Password);
jp2.add(user);
jp2.add(passwordField);
jp1.add(jp2);
jp1.add(jp3,"South");
this.add(jp1);
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
int height = Toolkit.getDefaultToolkit().getScreenSize().height;


this.setLocation(width/2-200, height/2-150);
//添加监听器，按按钮会弹出对话框
 jb1.addActionListener(new ActionListener(){  
            @Override  
            public void actionPerformed(ActionEvent e) {  
                String s1=user.getText();  
                char[] s2=passwordField.getPassword();  
               // System.out.println(s1);  
               // System.out.println(s2);  
                char[] pwd={'a','b','c','1','2','3'};    //密码为abc123
                
                Component frame = null;
                                         //登录用户名为：九月长安
if (s1.equals("九月长安") && Arrays.equals(s2,pwd)) { 
                                              // 若正确登录则提示登录成功
                    JOptionPane.showMessageDialog(frame,  
                            "登录成功 ！","温馨提示",JOptionPane.INFORMATION_MESSAGE);  
               
                }  
                else {                    
                    JOptionPane.showMessageDialog(frame,"用户名错误!!","Warning",JOptionPane.WARNING_MESSAGE);                     
                }  
                Arrays.fill(s2,'0'); 
            }             
        });  


jb2.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent e){
Component frame = null;
JOptionPane.showMessageDialog(frame,  
                        "正在跳转...","温馨提示",JOptionPane.INFORMATION_MESSAGE);  
               
//System.out.println("正在跳转...");
}

});
 jb3.addActionListener(new ActionListener(){  
            @Override  
            public void actionPerformed(ActionEvent e) {  
                System.exit(0);
            }             
        });  


this.setTitle("Java-彩票抽奖系统");  //标题
this.setSize(400, 150);  //窗口大小
this.setVisible(true);   //窗口可见

this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);  //关闭窗口按钮  右上角的X



}


}