javaBean+jsp+mysql实现登录验证

最近做些小例子来复习，拿出来跟大家分享

 

源码展示:

UserBean.java

package test.bean;

public class UserBean {
   //属性名称与表单元素相同时，可实现 自省
	
	String userName = null;
	String userPwd = null;
	boolean logined = false;
	//无参数的构造方法
	public UserBean(){
		//读取userNmae属性
	}
	
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getUserPwd() {
		return userPwd;
	}
	public void setUserPwd(String userPwd) {
		this.userPwd = userPwd;
	}
	public boolean isLogined() {
		return logined;
	}
	public void setLogined(boolean logined) {
		this.logined = logined;
	}


	
}

DBBean.java

package test.bean;

import java.sql.*;

public class DBBean {

	Connection con = null;
	Statement stat = null;
	PreparedStatement pstat = null;
	ResultSet rs = null;
	
	//无参数的构造函数
	public DBBean() {}
	
	//取得数据库连接
	public Connection getCon(){
		try{
			Class.forName("com.mysql.jdbc.Driver").newInstance();
			String url = "jdbc:mysql://localhost:3306/userdb?user=root&password=root&useUnicode=true&characterEncoding=gb2312";
			con = DriverManager.getConnection(url);
		}catch(Exception ex){
			ex.printStackTrace();
		}
		return con;		
	}
	
	//执行数据库查询并返回查询结果
	public ResultSet query(String sql){
		try{
			con = getCon();
			stat = con.createStatement();
			rs = stat.executeQuery(sql);
		}catch(Exception ex){
			ex.printStackTrace();
		}
		return rs;
	}
	
	//执行数据库更新
	public void update(String sql){
		try{
			con = getCon();
			stat = con.createStatement();
			stat.executeUpdate(sql);
		}catch(Exception ex){
			ex.printStackTrace();
		}
	}

	//执行数据库更新
	public void update(String sql,String[] args){
		try{
			con = getCon();
			pstat = con.prepareStatement(sql);
			for (int i=0;i

 

login.jsp

 

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


  
    
    
	
  
  
  
    
 
              登录账号: 
              

              登录密码：
              

              
              
    
  

 

chkuser.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ page import="java.sql.*"%>
<%@ page import="test.bean.DBBean"%>
<%@ page import="test.bean.UserBean"%>







  
    
  
  
  
    
用户登录验证
    

    <%
		//user对象中的userName和userPWD是通过自省完成赋值的
		String userName = user.getUserName();
		String userPwd = user.getUserPwd();
		String sql = "select * from user where userName='"+userName+"' and userPwd='"+userPwd+"'";
		if (user.isLogined()){
			out.println("您已经登录过了!");
		}else{
			ResultSet rs = myDBbean.query(sql);
			if (rs.next()){
				user.setLogined(true);
				out.println("恭喜您登录成功!");
			}else{
				user.setLogined(false);
				out.println("对不起，您的帐号或密码不正确!");
			}					
		}			   	
    %>
  

 

数据库: