用Javabean实现一个登录

上次直接用jsp内置对象完成一个登录框。

这里用Javabean封装业务逻辑和数据。好处：

Javabean部分：

　　Users.java:

　　

package com.po;
//用户类
public class Users {

    private String username;
    private String password;
    
    public Users()
    {
        
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
    
    
}

UserDAO.java:

package com.dao;

import com.po.Users;

//用户的业务逻辑类
public class UsersDAO {
    
    //用户登录方法
    public boolean usersLogin(Users u)
    {
        if("admin".equals(u.getUsername())&&"admin".equals(u.getPassword()))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}

 

login.jsp:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
   String path = request.getContextPath();
   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
    <head>
        <!-- Page title -->
        <title>imooc - Login</title>
        <!-- End of Page title -->
        <!-- Libraries -->
        <link type="text/css" href="css/login.css" rel="stylesheet" />    
        <link type="text/css" href="css/smoothness/jquery-ui-1.7.2.custom.html" rel="stylesheet" />    
        <script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
        <script type="text/javascript" src="js/easyTooltip.js"></script>
        <script type="text/javascript" src="js/jquery-ui-1.7.2.custom.min.js"></script>
        <!-- End of Libraries -->    
    </head>
    <body>
    <div id="container">
        <div class="logo">
            <a href="#"><img src="assets/logo.png" alt="" /></a>
        </div>
        <div id="box">
            <form action="dologin.jsp" method="post">
            <p class="main">
                <label>用户名: </label>
                <input name="username" value="" /> 
                <label>密码: </label>
                <input type="password" name="password" value="">    
            </p>
            <p class="space">
                <input type="submit" value="登录" class="login" style="cursor: pointer;"/>
            </p>
            </form>
        </div>
    </div>
    </body>
</html>

 

dologin.jsp:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<% 
  request.setCharacterEncoding("utf-8");
%>
<jsp:useBean id="loginUser" class="com.po.Users" scope="page"/>
<jsp:useBean id="userDAO" class="com.dao.UsersDAO" scope="page"/>
<jsp:setProperty property="*" name="loginUser"/>

<%
  String path = request.getContextPath();
  String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
  
  //如果用户和密码都等于admin,则登录成功
  if(userDAO.usersLogin(loginUser))
  {
     session.setAttribute("loginUser", loginUser.getUsername());
     request.getRequestDispatcher("login_success.jsp").forward(request, response);
     
  }
  else
  {
     response.sendRedirect("login_failure.jsp");
  }
%>

 

两个转接页面：

login_success.jsp:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
   String path = request.getContextPath();
   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
    <head>
        <!-- Page title -->
        <title>imooc - Login</title>
        <!-- End of Page title -->
        <!-- Libraries -->
        <link type="text/css" href="css/login.css" rel="stylesheet" />    
        <link type="text/css" href="css/smoothness/jquery-ui-1.7.2.custom.html" rel="stylesheet" />    
        <script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
        <script type="text/javascript" src="js/easyTooltip.js"></script>
        <script type="text/javascript" src="js/jquery-ui-1.7.2.custom.min.js"></script>
        <!-- End of Libraries -->    
    </head>
    <body>
    <div id="container">
        <div class="logo">
            <a href="#"><img src="assets/logo.png" alt="" /></a>
        </div>
        <div id="box">
          <% 
             String loginUser = "";
             if(session.getAttribute("loginUser")!=null)
             {
                loginUser = session.getAttribute("loginUser").toString();
             }
          %>
             欢迎您<font color="red"><%=loginUser%></font>,登录成功！
        </div>
    </div>
    </body>
</html>

login_failure.jsp:

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
   String path = request.getContextPath();
   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
    <head>
        <!-- Page title -->
        <title>imooc - Login</title>
        <!-- End of Page title -->
        <!-- Libraries -->
        <link type="text/css" href="css/login.css" rel="stylesheet" />    
        <link type="text/css" href="css/smoothness/jquery-ui-1.7.2.custom.html" rel="stylesheet" />    
        <script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
        <script type="text/javascript" src="js/easyTooltip.js"></script>
        <script type="text/javascript" src="js/jquery-ui-1.7.2.custom.min.js"></script>
        <!-- End of Libraries -->    
    </head>
    <body>
    <div id="container">
        <div class="logo">
            <a href="#"><img src="assets/logo.png" alt="" /></a>
        </div>
        <div id="box">
             登录失败！请检查用户或者密码!<br>
          <a href="login.jsp">返回登录</a>   
        </div>
    </div>
    </body>
</html>

 

posted @ 2017-06-25 18:31  Lawliet__zmz  阅读(604)  评论(0)  编辑  收藏  举报