userdelete.java

JAVA实现的图书管理系统

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class UserDelete extends JFrame implements ActionListener
{
	DataBaseManager db=new DataBaseManager();
	ResultSet rs;
	JPanel panel1,panel2;
	Container c;
	JLabel UserLabel,PasswordLabel;
	JTextField UserTextField;
	JPasswordField PasswordTextField;
	JButton YesBtn,CancelBtn;
	public UserDelete()
	{
		super("删除用户");
		c=getContentPane();
		c.setLayout(new BorderLayout());
		UserLabel=new JLabel("用户名",JLabel.CENTER);
		PasswordLabel=new JLabel("密码",JLabel.CENTER);
		UserTextField=new JTextField(10);
		PasswordTextField=new JPasswordField(10);
		YesBtn=new JButton("确定");
		CancelBtn=new JButton("取消");
		YesBtn.addActionListener(this);
		CancelBtn.addActionListener(this);
		panel1=new JPanel();
		panel1.setLayout(new GridLayout(2,2));
		panel1.add(UserLabel);
		panel1.add(UserTextField);
		panel1.add(PasswordLabel);
		panel1.add(PasswordTextField);
		panel2=new JPanel();
		panel2.add(YesBtn);
		panel2.add(CancelBtn);
		c.add(panel1,BorderLayout.CENTER);
		c.add(panel2,BorderLayout.SOUTH);
		setSize(300,300);
	}
	public void actionPerformed(ActionEvent e)
	{
		try
		{
		if(e.getSource()==CancelBtn)
		{
			db.closeConnection();
			this.dispose();
		}
		else if(e.getSource()==YesBtn)
		{
			char[] password=PasswordTextField.getPassword();
			String passwordSTR=new String(password);
			String strSQL="select * from userTable where userName='"+
				UserTextField.getText().trim()+"' and password='"+
				passwordSTR+"'";
				if(UserTextField.getText().trim().equals(""))
				{
					JOptionPane.showMessageDialog(null,"用户名不能为空！");
				}
				else if(PasswordTextField.equals(""))
				{
					JOptionPane.showMessageDialog(null,"密码不能为空！");
				}
				else if(db.getResult(strSQL).first())
				{
					strSQL="delete from userTable where userName='"+
					UserTextField.getText().trim()+"'";
					
					if(db.updateSql(strSQL))
					{
						JOptionPane.showMessageDialog(null,"删除成功!");
						this.dispose();
						
					}
					else
					{
						JOptionPane.showMessageDialog(null,"删除失败！");
						this.dispose();
					}
					
					db.closeConnection();
				}
				else
				{
					JOptionPane.showMessageDialog(null,"不存在此用户或者密码错误！");
				}
		}
	}
	catch(SQLException sqle)
	{
		System.out.println(sqle.toString());
	}
	catch(Exception ex)
	{
		System.out.println(ex.toString());
	}
	}
}