useredit.java

图书馆管理系统：该系统的开发主要包括用户登陆

import javax.swing.*;
import java.awt.event.*;
import java.awt.GridLayout;
import java.sql.*;

public class userEdit extends JFrame implements ActionListener
{
	public userEdit()
	{
		setTitle("修改用户");
		setSize(200,200);
		gl=new GridLayout(5,2,20,20);
		JPanel panel=new JPanel();
		panel.setLayout(gl);
		userlbl=new JLabel("用户名");
		oldpasswordlbl=new JLabel("原密码");
		confirmlbl=new JLabel("确认新密码");
		newpasswordlbl=new JLabel("新密码");
		usertex=new JTextField("");
		oldpasswordtex=new JPasswordField("");
		newpasswordtex=new JPasswordField("");
		confirmtex=new JPasswordField("");
		addbtn=new JButton("确认");
		cancelbtn=new JButton("取消");
		panel.add(userlbl);
		panel.add(usertex);
		panel.add(oldpasswordlbl);
		panel.add(oldpasswordtex);
		panel.add(newpasswordlbl);
		panel.add(newpasswordtex);
		panel.add(confirmlbl);
		panel.add(confirmtex);
		panel.add(addbtn);
		panel.add(cancelbtn);
		getContentPane().add(panel);
		addbtn.addActionListener(this);
		cancelbtn.addActionListener(this);
		
		
	}
	public void actionPerformed(ActionEvent e)
	{
		Object source=e.getSource();
		if(source==addbtn)
		{	
			String username=new String(usertex.getText()).trim();
			if(username.equals(""))
			{
			JOptionPane.showMessageDialog(null,"用户名不能为空!");
			return;
			}
		String  password=new String(oldpasswordtex.getText()).trim();
		if(password.equals(""))
		{
			JOptionPane.showMessageDialog(null,"密码不能为空!");
			return;
		}
        String  pass=new String(newpasswordtex.getText()).trim();
		if(pass.equals(""))
		{
			JOptionPane.showMessageDialog(null,"新密码不能为空!");
			return;
		}
        String  con=new String(confirmtex.getText()).trim();
		if(con.equals(""))
		{
			JOptionPane.showMessageDialog(null,"密码不一致!");
			return;
		}
        if(con.equals("")||!(con.equals(pass)))
		{
			confirmtex.setText("");
			oldpasswordtex.setText("");
			newpasswordtex.setText("");
			JOptionPane.showMessageDialog(null,"密码不一样");
			return;
		}
		String strsql;
		strsql=("update 读者权限表 set 密码='"+pass+"' where 用户名='"+username+"' and 密码='"+password+"'");
		System.out.println(strsql);
		boolean success=db.executeSql(strsql);
	if(!success)
		{
			JOptionPane.showMessageDialog(null,"修改不成功，请重试");
		}
	else
	{
			JOptionPane.showMessageDialog(null,"修改成功");
			this.dispose();
		}
				
		}
		if(source==cancelbtn)
		{
			
			this.dispose();
			return;
		}
	}
	private JLabel userlbl;
	private JLabel oldpasswordlbl;
	private JLabel newpasswordlbl;
	private JLabel confirmlbl;
	private JTextField usertex;
	private JPasswordField oldpasswordtex;
	private JPasswordField confirmtex;
	private JPasswordField newpasswordtex;
	private JButton addbtn;
	private JButton cancelbtn;
	private GridLayout gl;
	private ResultSet rs;
	private DBManager db=new DBManager();
}