login.java

来自「图书管理系统」· Java 代码 · 共 189 行

/*
 * LOGIN.java
 *
 * Created on 2007年6月19日, 下午3:38
 */

package 图书管理系统;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.SQLException;
import javax.swing.*;
/**
 *
 * @author  ERIC
 */
public class LOGIN extends javax.swing.JFrame {
    
    /** Creates new form LOGIN */
    public LOGIN() {
        initComponents();
        this.setTitle("用户登录");
         this.setBounds(300,250,350,250);
    }
    
    /** 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=" 生成的代码 ">//GEN-BEGIN:initComponents
    private void initComponents() {
        Main = new javax.swing.JFrame();
        menu = new java.awt.MenuBar();
        popupMenu1 = new java.awt.PopupMenu();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        user = new javax.swing.JTextField();
        Login = new javax.swing.JButton();
        Exit = new javax.swing.JButton();
        password = new javax.swing.JPasswordField();

        org.jdesktop.layout.GroupLayout MainLayout = new org.jdesktop.layout.GroupLayout(Main.getContentPane());
        Main.getContentPane().setLayout(MainLayout);
        MainLayout.setHorizontalGroup(
            MainLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        MainLayout.setVerticalGroup(
            MainLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );
        popupMenu1.setLabel("PopupMenu");

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jLabel1.setText("\u7528\u6237\u540d\uff1a");

        jLabel2.setText("\u5bc6 \u7801\uff1a");

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

        Exit.setText("\u9000\u51fa");
        Exit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                ExitActionPerformed(evt);
            }
        });

        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(75, 75, 75)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                    .add(jLabel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 56, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(jLabel2)
                    .add(Login))
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                    .add(password, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 95, Short.MAX_VALUE)
                    .add(user, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 95, Short.MAX_VALUE)
                    .add(layout.createSequentialGroup()
                        .add(38, 38, 38)
                        .add(Exit)))
                .addContainerGap(73, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .add(39, 39, 39)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(jLabel1)
                    .add(user, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .add(21, 21, 21)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(jLabel2)
                    .add(password, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .add(30, 30, 30)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(Login)
                    .add(Exit))
                .addContainerGap(20, Short.MAX_VALUE))
        );
        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void ExitActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_ExitActionPerformed
     System.exit(0);
    }//GEN-LAST:event_ExitActionPerformed

    private void LoginActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_LoginActionPerformed
        try{
            boolean sign1=false,sign2=false;
          Connection con=connect.getcon();
          Statement stmt=connect.getstmt();
            ResultSet rs=stmt.executeQuery("select 用户名,密码,权限 from 用户表");
            while(rs.next()) {
                String name1,name2,pw1,pw2,level;
                char ch[];
                name1=user.getText();
               loginuser.setusername(name1);
                name2=(String)rs.getString(1).trim();
              if(name1.equals(name2))
               {
                    ch=password.getPassword();
                    pw1=new String(ch);
                    pw2=rs.getString(2);
                    if(pw1.equals(pw2))
                    {
                        loginuser.setpassword(pw1);
                        level=rs.getString(3);
                        loginuser.setlevel(level);
                    sign1=true;
                    rs.close();
                    Main_Frame dialog=new Main_Frame();
                    dialog.setVisible(true);
                    this.setVisible(false);
                    break;
                }
                    else 
                    {
                        sign2=true;
                        JOptionPane.showMessageDialog(null,"密码错误！");
                    }
            }
        }
            if(!sign1&&!sign2)
           JOptionPane.showMessageDialog(null,"用户名错误！"); 
        }
        catch(Exception ee)
         {
         ee.printStackTrace();
        //JOptionPane.showMessageDialog(null,ee.toString());
        return;
}
    }//GEN-LAST:event_LoginActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
              LOGIN login=new LOGIN();
                login.setVisible(true);
            }
        });
    }
    
    // 变量声明 - 不进行修改//GEN-BEGIN:variables
    private javax.swing.JButton Exit;
    private javax.swing.JButton Login;
    private javax.swing.JFrame Main;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private java.awt.MenuBar menu;
    private javax.swing.JPasswordField password;
    private java.awt.PopupMenu popupMenu1;
    private javax.swing.JTextField user;
    // 变量声明结束//GEN-END:variables
   public static java.sql.Statement stmt;
}