13.阶段项目，简单的登陆验证

目的：

1.login.jsp登录界面

<%@ 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+"/";
%>
<html>
    <head>
        <!-- Page title -->
        <title>imooc - Login</title>
        <!-- End of Page title -->
    </head>
    <body>
    <form action="dologin.jsp" method="post">
        <label>用户名: </label>
        <input name="username" value="" /> 
        <label>密码: </label>
        <input type="password" name="password" value="">    
        <input type="submit" value="登录" />
    </form>
    </body>
</html>

2.登录处理页面dologin.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+"/";
  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");
  }
%>

3.登录成功跳转到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 -->
    </head>
    <body>
          <% 
             String loginUser = "";
             if(session.getAttribute("loginUser")!=null)
             {
                loginUser = session.getAttribute("loginUser").toString();
             }
          %>
             欢迎您<font color="red"><%=loginUser%></font>,登录成功！
    </body>
</html>

4.登录失败跳转到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 -->
    </head>
    <body>
         登录失败！请检查用户或者密码!<br>
      <a href="login.jsp">返回登录</a>   
    </body>
</html>

5.效果

 

posted @ 2016-08-16 16:09  笨蛋敏  阅读(195)  评论(0)  编辑  收藏  举报