用JAVA编写一个用户登陆界面-用户验证通过数据库实现

这是我以前写的系统登录框的loginpackage java1;import java.awt.*;import java.awt.event.*;import java.sql.*;import java.util.*;import javax.swing.*;import javax.swing.event.*;import java.awt.Rectangle;import java.awt.Font;public class login extends JFrame public login() try jbInit(); catch (Exception ex) ex.printStackTrace(); public static void main(String args) login frm=new login(); frm.setBounds(300,200,300,260); frm.setVisible(true); private void jbInit() throws Exception this.getContentPane().setLayout(null); jLabel1.setForeground(Color.red); jLabel1.setText(用户名); jLabel1.setBounds(new Rectangle(25, 72, 68, 29); jButton2.setBounds(new Rectangle(142, 159, 81, 30); jButton2.setText(取消); jButton2.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) jButton2_actionPerformed(e); ); jButton1.setBounds(new Rectangle(38, 159, 81, 29); jButton1.setText(确定); jButton1.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) jButton1_actionPerformed(e); ); jTextField1.setBounds(new Rectangle(109, 79, 136, 23); jPasswordField1.setBounds(new Rectangle(109, 115, 136, 23); this.getContentPane().add(jLabel1); jLabel3.setFont(new java.awt.Font(隶书, Font.PLAIN, 24); jLabel3.setText(学 生 考 试 系 统); jLabel3.setBounds(new Rectangle(22, 15, 268, 47); this.getContentPane().add(jTextField1); this.getContentPane().add(jLabel2); this.getContentPane().add(jButton2); this.getContentPane().add(jButton1); this.getContentPane().add(jLabel3); this.getContentPane().add(jPasswordField1); jLabel2.setForeground(Color.red); jLabel2.setText(密码); jLabel2.setBounds(new Rectangle(26, 112, 68, 29); JLabel jLabel1 = new JLabel(); JLabel jLabel2 = new JLabel(); JTextField jTextField1 = new JTextField(); JButton jButton1 = new JButton(); JButton jButton2 = new JButton(); JLabel jLabel3 = new JLabel(); JPasswordField jPasswordField1 = new JPasswordField(); main2 wo=new main2(); int sum; /判断权限的方法 public void success() try ResultSet rs1; String s1=select * from 管理权限 where name=+jTextField1.getText()+ and password=+jPasswordField1.getText()+; rs1=sqlcx.Rs_jiluji(s1); rs1.first(); sum=Integer.parseInt(String)(rs1.getString(3); System.out.println(sum); very(); catch(Exception c)System.out.println(success error); /根据权限设置窗口 public void very() if (sum=1) JOptionPane.showOptionDialog(this, 您现在是以教师权限登陆, 登陆信息 , JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null); else JOptionPane.showOptionDialog(this, 你现在是以学生权限登陆, 登陆信息 , JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null); wo.jButton2.setVisible(false); wo.jButton3.setVisible(false); wo.jButton4.setVisible(false); wo.jButton5.setVisible(false); wo.jButton6.setVisible(false); wo.jButton7.setVisible(false); wo.jButton8.setVisible(false); wo.jMenu2.setVisible(false); wo.jMenu3.setVisible(false); wo.jMenu4.setVisible(false); public void jButton1_actionPerformed(ActionEvent e) /判断用户名是否为空 if (jTextField1.getText().length() = 0) JOptionPane.showOptionDialog(this, 用户名不能为空, 错误信息 , JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null); /判断密码是否为空 else if (jPasswordField1.getText().length()=0) JOptionPane.showOptionDialog(this,密码不能为空, 错误信息 , JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null); else try ResultSet rs;/声明记录集 String sql=select * from 管理权限 where name=+jTextField1.getText()+; rs = sqlcx.Rs_jiluji(sql); if (rs.next() if(jPasswordField1.getText().equals(rs.getString(2) success(); wo.setBounds(60,40,700,600); wo.setVisible(true); this.dispose(); else JOptionPane.showOptionDialog(this,密码错误, 错误信息 , JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null); else JOptionPane.showOptionDialog(this,没有所要找的用户名, 错误信息 , JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE, null, null, null); catch(Except