java--用户登录界面

 1 package Com.Swing;
 2 /*
 3  * 用户名密码登录界面，添加判断用户名和密码是否正确
 4  * */
 5 import java.awt.*;
 6 import javax.swing.*;
 7 import java.awt.event.*;
 8 public class Dengluchuangkou extends JFrame {
 9
10     public static void main(String[] args) {
11         // TODO Auto-generated method stub
12         new Dengluchuangkou();
13     }
14     public Dengluchuangkou (){
15         JFrame jf=new JFrame ();
16         Container container=jf.getContentPane();
17         jf.setBounds(300,200,300,180);
18         container.setLayout(null);
19
20         JLabel jl1=new JLabel("用户名");
21         jl1.setBounds(10,10, 50, 20);
22         //JTextArea name=new JTextArea();//TextArea可以多行，可以添加滚动条
23         JTextField name=new JTextField();//TextField只有一行可写
24         name.setBounds(80,10,150,20);
25         JLabel jl2=new JLabel("密码");
26         jl2.setBounds(10,50,50,20);
27         JPasswordField password=new JPasswordField();
28         password.setBounds(80,50,150,20);
29         container.add(jl1);
30         container.add(name);
31         container.add(jl2);
32         container.add(password);
33
34         JButton jb1=new JButton("确定");
35         jb1.setBounds(40,90,80,30);
36         JButton jb2=new JButton("重置");
37         jb2.setBounds(170,90,80,30);
38         container.add(jb1);
39         container.add(jb2);
40
41         jf.setVisible(true);
42         jf.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
43
44         //设置监听
45         jb1.addActionListener(new ActionListener(){
46             public void actionPerformed(ActionEvent e){
47                 if(name.getText().trim().equals("admin")&&password.getText().trim().equals("admin")){
48                     JOptionPane.showMessageDialog(null,"登录成功");
49                 }
50                 if(name.getText().trim().length()==0||password.getText().trim().length()==0){
51                     JOptionPane.showMessageDialog(null,"用户名或密码不能为空！");
52                 }else{
53                     JOptionPane.showMessageDialog(null,"用户名或密码错误！");
54                 }
55
56             }
57         });
58
59         jb2.addActionListener(new ActionListener(){
60             public void actionPerformed(ActionEvent e){
61                 name.setText("");
62                 password.setText("");
63             }
64         });
65
66     }
67 }