jiemian.java

经过调查分析

/*
 * 登录.java
 *
 * Created on 2008年9月29日, 下午8:25
 */

package javaapplication1;

import java.sql.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;
/**
 *
 * @author  mis06
 */
public class Jiemian extends javax.swing.JFrame {
    
    /** Creates new form 登录 */
    public Jiemian() {
        super("教务管理系统");
        initComponents();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:initComponents
    private void initComponents() {
        jLabel1 = new javax.swing.JLabel();
        textField = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        Button1 = new javax.swing.JButton();
        Button2 = new javax.swing.JButton();
        passwordField = new javax.swing.JPasswordField();
        jLabel3 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jLabel1.setText("\u7f16\u53f7");

        jLabel2.setText("\u5bc6\u7801");

        Button1.setText("\u767b\u5f55");
        Button1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                Button1ActionPerformed(evt);
            }
        });

        Button2.setText("\u53d6\u6d88");
        Button2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                Button2ActionPerformed(evt);
            }
        });

        jLabel3.setFont(new java.awt.Font("华文楷体", 1, 24));
        jLabel3.setText("\u6b22\u8fce\u4f7f\u7528\u6559\u52a1\u7ba1\u7406\u7cfb\u7edf");

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .add(46, 46, 46)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                    .add(layout.createSequentialGroup()
                        .add(Button1)
                        .add(42, 42, 42)
                        .add(Button2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 62, Short.MAX_VALUE))
                    .add(layout.createSequentialGroup()
                        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                            .add(jLabel2)
                            .add(layout.createSequentialGroup()
                                .add(jLabel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)))
                        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                            .add(layout.createSequentialGroup()
                                .add(26, 26, 26)
                                .add(passwordField, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 111, Short.MAX_VALUE))
                            .add(layout.createSequentialGroup()
                                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                                .add(textField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 111, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))))
                .add(193, 193, 193))
            .add(layout.createSequentialGroup()
                .addContainerGap()
                .add(jLabel3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 258, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(132, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .addContainerGap()
                .add(jLabel3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 33, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                .add(23, 23, 23)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(textField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 28, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(jLabel1))
                .add(26, 26, 26)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(jLabel2)
                    .add(passwordField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 24, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .add(36, 36, 36)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(Button2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 27, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(Button1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 29, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(91, Short.MAX_VALUE))
        );
        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void Button2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_Button2ActionPerformed
    System.exit(1);
// TODO add your handling code here:
    }//GEN-LAST:event_Button2ActionPerformed

    private void Button1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_Button1ActionPerformed
    
   Statement statement;
   String s1=new String(textField.getText());  
   String s2=new String(passwordField.getPassword()); 
   String s3="学生",s4="教师",s5="教秘",s6,s7;
   int flag=0,n=0;
    
   try{
      Connect con=new Connect();
      statement=con.con.createStatement();
      
     String str;
     
     str="UPDATE 用户 SET 状态='未登录' WHERE 状态='登录'";
     n=statement.executeUpdate(str);
     
      s6="SELECT 密码 FROM 用户 WHERE 编号='"+s1+"'";
      ResultSet resultSet1=statement.executeQuery(s6);
   
    ResultSetMetaData metaData1=resultSet1.getMetaData();
    int numberOfColumns1=metaData1.getColumnCount();
    
    while(resultSet1.next())
       for(int i=1;i<=numberOfColumns1;i++)
       {if(resultSet1.getObject(i).toString().equals(s2))
          flag++;
       
     }
    
     if(flag==1) 
    {dispose();
      s7="SELECT 类型 FROM 用户 WHERE 编号='"+s1+"'";
     ResultSet resultSet2=statement.executeQuery(s7);
    
    ResultSetMetaData metaData2=resultSet2.getMetaData();
    int numberOfColumns2=metaData2.getColumnCount();
    
    while(resultSet2.next()){
       for(int i=1;i<=numberOfColumns2;i++)
        {
           if(resultSet2.getObject(i).toString().equals(s3))
            {
               
               Student s=new Student();
               
               s.setVisible(true);
              }
           else
            { if(resultSet2.getObject(i).toString().equals(s4))
              {  Teacher t=new Teacher();
                 t.setVisible(true);
                
                 }
              else if(resultSet2.getObject(i).toString().equals(s5))
              {Secretary se=new Secretary();
               se.setVisible(true);}
           }
        }
     }
     String s="UPDATE 用户 SET 状态='登录' WHERE 编号='"+s1+"'";
      int reg=0;
      reg=statement.executeUpdate(s);
     }
     
      
       else  JOptionPane.showMessageDialog(null,"用户名或密码不正确，请重新输入");
   }    
   
   catch(SQLException sqlException){
        JOptionPane.showMessageDialog(null,sqlException.getMessage(),"Database Error",JOptionPane.ERROR_MESSAGE);
        System.exit(1);}

   catch(ClassNotFoundException classNotFound){
       JOptionPane.showMessageDialog(null,classNotFound.getMessage(),"Driver Not Found",JOptionPane.ERROR_MESSAGE);
        System.exit(1); }
    // TODO add your handling code here:
        
    }//GEN-LAST:event_Button1ActionPerformed
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Jiemian().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton Button1;
    private javax.swing.JButton Button2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPasswordField passwordField;
    private javax.swing.JTextField textField;
    // End of variables declaration//GEN-END:variables
    
}