Java implementation of the simple program login interface

Here is the simple code I wrote:
Simple, no chewing stickers, directly on the code. File save user name and password, enter password error 3 times to exit the program.

[Java] View plaincopy
01.public Login () throws ioexception{

4.    GetKeys();//获取文件登陆信息  

8.    User = new JTextField(15);  

10.    PassWord = new JPasswordField(15);  

12.    PassWord.setEchoChar(‘*‘);  

16.    JPanel p1 = new JPanel();  

18.    p1.add(new JLabel("姓名:"));  

20.    p1.add(User);  

22.    p1.add(new JLabel("密码:"));  

24.    p1.add(PassWord);  

28.    add(p1,BorderLayout.CENTER);  

30.    JPanel p2 = new JPanel();  

32.    JButton button = new JButton("确定");  

34.    button.addActionListener(new ActionListener()//登录监听器  

36.    {  

38.        @SuppressWarnings("deprecation")  

40.        public void actionPerformed(ActionEvent e)  

42.        {  

44.            String name = User.getText();  

46.            String password = PassWord.getText();  

48.            if(message.containsKey(name))//姓名正确  

50.            {  

52.                num = 3;//一个用户名有3次输入密码机会  

54.                if(message.get(name).equals(password))//密码正确  

56.                {  

58.                    JOptionPane.showMessageDialog(Login.this, "登陆成功!");  

60.                    System.exit(0);  

62.                }  

64.                else  

66.                {  

68.                    num--;  

70.                    if(num > 0)  

72.                    {  

74.                        JOptionPane.showMessageDialog(Login.this, "密码错误!还有"+num+"次机会");  

76.                        PassWord.setText("");  

78.                    }  

80.                    else if(num == 0)  

82.                    {  

84.                        JOptionPane.showMessageDialog(Login.this, "登录3次失败程序关闭！");  

86.                        System.exit(0);  

88.                    }  

90.                }  

92.            }  

94.            else  

96.            {  

98.                JOptionPane.showMessageDialog(Login.this, "不存在该用户名");  

100.                User.setText("");  

102.                PassWord.setText("");  

104.            }  

108.        }  

110.    });  

112.    p2.add(button);  

116.    button = new JButton("取消");  

118.    button.addActionListener(new ActionListener()  

120.    {  

122.        public void actionPerformed(ActionEvent e)  

124.        {  

126.            System.exit(0);  

128.        }  

130.    });  

132.    p2.add(button);  

136.    add(p2,BorderLayout.SOUTH);  

138.    setLocation(400,200);  

140.    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  

142.    pack();  

144.    setVisible(true);  

146. }
     End

Java implementation of the simple program login interface