菜鸟，实在是不会，找了好多方法，就是调试错误，求大神赐一计，万分感谢，下面是我的代码（标注部分为现在的方法）
package TestLog;
import Test.Logincd1;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Login2 extends JFrame
{
    private JPanel panel=new JPanel();
    private JPanel panel1=new JPanel();
    private JPanel panel2=new JPanel();
    private JPanel panel3=new JPanel();
    private JPanel panel4=new JPanel();
    private JLabel l1=new JLabel("登录名");
    private JLabel l2=new JLabel("密码");
    private JLabel l3=new JLabel("考勤管理系统");   
    private JTextField f1=new JTextField(11);
    private JTextField f2=new JTextField(11);
    private JButton jbtBack=new JButton("重置");
    private JButton jbtOK=new JButton("登录");
    private JButton jbtCancel=new JButton("取消");
   
    public Login2()
    {  
         l3.setFont(new Font("TimesRoman",Font.BOLD,20));
         l1.setForeground(new Color(70,130,180));
         l2.setForeground(new Color(70,130,180));
         l3.setForeground(new Color(70,130,180));
        
         jbtBack.setForeground(new Color(70,130,180));
         jbtOK.setForeground(new Color(70,130,180));
         jbtCancel.setForeground(new Color(70,130,180));
        setLayout(new BorderLayout(8,10));
        add(panel1,BorderLayout.WEST);
        add(panel2,BorderLayout.NORTH);
        add(panel3,BorderLayout.CENTER);
        add(panel4,BorderLayout.SOUTH);
      
        panel1.add(l3);
        panel2.add(l1);
        panel2.add(f1);
        panel3.add(l2);
        panel3.add(f2);
        panel4.add(jbtOK);
        panel4.add(jbtBack);
        panel4.add(jbtCancel);
 
        panel.add(panel1);
        panel.add(panel2);
        panel.add(panel3);
        panel.add(panel4);
        add( panel);
        panel.setOpaque(false);
        panel1.setOpaque(false);
        panel2.setOpaque(false);
        panel3.setOpaque(false);
        panel4.setOpaque(false);
        jbtOK.addActionListener(new Enter());
        jbtBack.addActionListener(new ReWrite() );
        jbtCancel.addActionListener(new Close());
        
    }
    public static void main (String[] args)
    {
        Login2 frame=new  Login2();
         frame.setTitle("考勤管理系统");
         frame.setSize(250,250);
         frame.setLocationRelativeTo(null);
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
         
         ImageIcon background = new ImageIcon("C:/Users/Administrator/workspace/Log/src/Test/picture/2.jpg");
         JLabel label = new JLabel(background);
         label.setBounds(0, 0, background.getIconWidth(),
                 background.getIconHeight());
         JPanel imagePanel = (JPanel) frame.getContentPane();
         imagePanel.setOpaque(false);
         imagePanel.setLayout(new FlowLayout());
         frame.getLayeredPane().setLayout(null);
         frame.getLayeredPane().add(label, new Integer(Integer.MIN_VALUE));
    }         
    class Enter implements ActionListener{
        
        
          public void actionPerformed(ActionEvent e)
          {  
            
             if((f1.getText()).equals("abc")&&(f2.getText()).equals("123"))
                      {
                    JOptionPane.showMessageDialog( null,"登录成功,教师登录!");
                    Login2.this.setVisible(false);
                    TeacherLogin.TeacherSystem();
                  
                      }
             else if ((f1.getText()).equals("ABC") && (f2.getText()).equals("111")) {
                          JOptionPane.showMessageDialog(null, "登录成功，学生登录！");
                          Login2.this.setVisible(false);
                        
                          StudentLogin.Checkin();  
              }
                else JOptionPane.showMessageDialog(null, "用户名或密码错误，登录失败，请重新登录!");
           
          }
         }
         class ReWrite implements ActionListener{
          public void actionPerformed(ActionEvent e)
          {
           f1.setText("");
           f2.setText("");
           f1.requestFocus();
          }
         }
         class Close implements ActionListener{
         public void actionPerformed(ActionEvent e)
            {
                JButton bt=(JButton)e.getSource();
                if(bt.equals(jbtCancel));
                System.exit(0);
               
            }
            }
         
}

调试错误？具体是什么错误呢？
根据你给出的代码
登陆界面宽度太小，登陆验证是可以的
TeacherLogin，StudentLogin这两个类的代码没贴出来，后面就不知道了

这种数据放到数据库保存更好些，最好做个加密啥的
用文件的话，可以放到resources（项目的资源目录）下面
private boolean verifyLogin(String name, String password) {
    if (name == null || name.length() < 1 || password == null || password.length() < 1) {
        return false;
    }
    try {
        Properties prop = new Properties();
        prop.load(AppTest.class.getClassLoader().getResourceAsStream("password.properties"));
        return password.equals(prop.getProperty(name));
    } catch (Exception e) {
        System.out.println("密码校验异常:" + e.getCause());
    }
    return false;
}

因为数据库还没学，所以暂时想用文件保存一下

没看太懂，大神能给个注释吗？

加载配置文件的方式，你百度下就知道了

好的，谢谢