checkid.java

基于UML的书店采购管理系统设计主要是供书店管理员使用。系统提供了管理员登陆

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package book_booking;
import javax.swing.JFrame;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
//import javax.swing.border.*;
import java.sql.*;
/**
 *
 * @author Administrator
 */
public class CheckID extends JFrame implements ActionListener
{
    private SqlBean sqlBean = new SqlBean();

     JTextField usernameField;
     JPasswordField passwordField;
     JButton jbOK,jbCancel;    
    public CheckID()
    {
       usernameField=new JTextField(10);
       passwordField=new JPasswordField(10);
       jbOK=new JButton("确定",new ImageIcon("D:/book_booking/image/14.jpg"));
       jbCancel=new JButton("取消",new ImageIcon("D:/book_booking/image/56.jpg"));
       jbOK.addActionListener(this);
       jbCancel.addActionListener(this);
       Box box1=Box.createHorizontalBox();
       box1.add(new JLabel("输入用户名：",new ImageIcon("D:/book_booking/image/47.jpg"),JLabel.CENTER));
       box1.add(usernameField);
       
       Box box2=Box.createHorizontalBox();
       box2.add(new JLabel("输入密码：",new ImageIcon("D:/book_booking/image/17.jpg"),JLabel.CENTER));
       box2.add(passwordField);
       
       Box boxH=Box.createVerticalBox();
       boxH.add(box1);
       boxH.add(box2);
       boxH.add(Box.createVerticalGlue());
       
       JPanel pCenter=new JPanel();
       pCenter.add(boxH);
       setLayout(new BorderLayout());
       add(pCenter,BorderLayout.CENTER);
       JPanel pSouth=new JPanel();
       pSouth.add(jbOK);
       pSouth.add(jbCancel);
       add(pSouth,BorderLayout.SOUTH);
       addWindowListener(new WindowAdapter()
		                 { public void windowClosing(WindowEvent e)
		                     {
		                     	System.exit(0);
		                     }
		                 });
         setVisible(true);
//         
         setBounds(500,400,600,300);
       validate();                    
    }

    public void actionPerformed(ActionEvent e) 
    {
        String username = usernameField.getText().trim();
        String password = new String(passwordField.getPassword()).trim();
        try
        {
            if (e.getSource() == jbOK)
              {
                if(username.equals(""))
                   {
                         JOptionPane.showMessageDialog(this,"用户名不能为空！","错误",JOptionPane.ERROR_MESSAGE);
                         return;
                   }
                  String sqlStr="select * from login where user_name="+"'"+username+"'"+" and psw="+"'"+password+"'";
                  ResultSet result=sqlBean.executeQuery(sqlStr);
                  if(result.next())
                  {               
                        sqlBean.CloseDataBase();
                        this.setVisible(false);
                        this.dispose();
                        Interface manager = new Interface();
                        manager.setSize(650,600);                      
                        }
                    else
                        {
                        JOptionPane.showMessageDialog(this,"对不起，用户名或密码不正确！","警告",JOptionPane.WARNING_MESSAGE);        
                        }             
                }
            else if (e.getSource() == jbCancel)
	      {
		this.setVisible(false);
//		this.dispose();		
	      }
        }
        catch(Exception ex)
	{
		System.err.println(ex);
	}
    }
     public static void main(String[] args) 
    {
        CheckID frame = new CheckID();
        frame.setSize(300,200); 
        frame.setVisible(true);
    }   
    
}