changepassword.java

一个简单的学生信息查询系统

//ChangePassword.java 

import java.awt.Container; 
import java.awt.Dimension; 
import java.awt.Toolkit; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.*; 

public class ChangePassword extends JFrame implements ActionListener { 
    JPasswordField newpassword; 

    JLabel label; 

    JButton button; 

    Container container; 

    String username; 

    public ChangePassword(String username) { 
        super("修改密码"); 
        this.username = username; 
        container = getContentPane(); 
        container.setLayout(null); 
        setSize(250, 115); 

        newpassword = new JPasswordField(); 
        newpassword.setEchoChar('*'); 
        button = new JButton(); 
        button.setText("确定"); 
        label = new JLabel(); 
        label.setText("输入新密码:"); 

        label.setBounds(10, 10, 100, 25); 
        newpassword.setBounds(120, 10, 120, 25); 
        button.setBounds(95, 55, 60, 25); 
        container.add(newpassword); 
        container.add(label); 
        container.add(button); 

        button.addActionListener(this); 

        // 将窗口置于屏幕中央 
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); 
        Dimension frameSize = this.getSize(); 
        if (frameSize.height > screenSize.height) { 
            frameSize.height = screenSize.height; 
        } 
        if (frameSize.width > screenSize.width) { 
            frameSize.width = screenSize.width; 
        } 
        setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2); 
        setResizable(false); 
        setVisible(true); 
    } 

    public void actionPerformed(ActionEvent e) { 
        if (e.getSource() == button) {   
            // 取得用户输入的密码 
            char temp[] = newpassword.getPassword(); 
            String tempPass = new String(temp); 
            CheckUser pw = new CheckUser(); 
            if (pw.changepw(username, tempPass)) { 
                JOptionPane.showMessageDialog(null, "密码修改成功","信息", JOptionPane.INFORMATION_MESSAGE); 
            } else { 
                JOptionPane.showMessageDialog(null, "密码修改失败","警告", JOptionPane.WARNING_MESSAGE); 
            } 
            setVisible(false); 
        } 
    } 
}