jsp登陆

<%@ page language="java" import="java.util.*"
 pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>login</title>
  </head>  
  <body>
   <form action="./dologin.jsp" method="post" >
        用户名：<input name="userName"/><br><br>
        密码：   <input name="passWord"/><br><br>
        <input type="submit" value="登陆"/><br><br>
   </form>
  </body>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
  <head>    
    <title>My JSP 'success.jsp' starting page</title>  
  </head>
  <body>
   欢迎你！<%=request.getParameter("userName")
    %>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
   <%
           String username=request.getParameter("userName");
           String password=request.getParameter("passWord");
           if(username.equals("tom")&&password.equals("123"))
           {
               //跳转到成功页面
    request.getRequestDispatcher("success.jsp").forward(request, response);               
           }
           else{
               //返回登陆页面重新登陆
               response.sendRedirect("logion.jsp");
           }
    %>

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

String username=request.getParameter("userName");

String password=request.getParameter("passWord");

if(username.equals("tom")&&password.equals("123"))

{

//跳转到成功页面

request.getRequestDispatcher("success.jsp").forward(request, response);

}

else{

//返回登陆页面重新登陆

response.sendRedirect("logion.jsp");

}