65 modol1用户登录

定义一个Users类

package srever;public class Users {private String username;private String password;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;}}

定义一个UserDao类

package srever;//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;}}
}

定义一个login的jsp页面

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%><% request.setCharacterEncoding("utf-8");
%>
<jsp:useBean id="loginUser" class="srever.Users" scope="page"/>
<jsp:useBean id="userDAO" class="srever.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");}
%>

定义一个dologin的jsp页面

<%@ 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+"/";String username ="";String password ="";request.setCharacterEncoding("utf-8");//防止中文乱码username = request.getParameter("username");password = request.getParameter("password");//如果用户和密码都等于admin,则登录成功if("admin".equals(username)&&"admin".equals(password)){session.setAttribute("loginUser", username);request.getRequestDispatcher("login_success.jsp").forward(request, response);}else{response.sendRedirect("login_failure.jsp");}
%>

定义一个登录成功的页面login_success

<%@ 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>

定义一个登录失败login_failure

<%@ 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>

运行结果