jsp第五次作业

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <style type="text/css">
    body{font-size:16px;}
    </style>
    <script type="text/javascript">
    function mycheck(){
    if(form1.userName.value==""){
    alert("用户名不能为空，请输入用户名");
    form1.userName.focuse();
    return;
    }
    if(form1.password.value==""){
    alert("密码不能为空，请输入密码");
    form1.password.focus();
    return;
    }
    if(form1.validationCode.value==""){
    alert("验证码不能为空，请输入验证码");
    form1.validationCode.focus();
    return;
    }
    if(form1.validationCode.value!=form1.validationCode1.value){
    alert("请输入正确的验证码");
    form1.validationCode.focus();
    return;
    }
    form1.submit1();
    }
    </script>
  </head>
  
  <body>
   <form action="longincheck.jsp" name="form1" method="post">
   用户名:<input type="text" name="userName" size="16"><br>
   密&nbsp;&nbsp;&nbsp;&nbsp;码:
   <input type="password" name="password" size="18"><br>
   验证码:<input type="text" name="validationCode"
        onkeyDown="if(event.keyCode==13){form1.submit.focus();}" size=6>
        <%
        int intmethod1 = (int)(((Math.random())*11)-1);
        int intmethod2 = (int)(((Math.random())*11)-1);
        int intmethod3 = (int)(((Math.random())*11)-1);
        int intmethod4 = (int)(((Math.random())*11)-1);
        //将的到的随机数进行连接
        String intsum = ""+intmethod1+intmethod2+intmethod3+intmethod4;
       %>
       <!--设置隐藏域验证比较时使用  -->
        <input type="hidden" name="validationCode1" value="<%=intsum%>">
        <input type="text"   value="<%=intsum%>"  size=5>
        
   <br>
   <input type="submit" name="submit1" value="登录" onClick="mycheck()">
   &nbsp;
   <input type="reset" value="重置">
   </form>
    
     <br>
  </body>
</html>

longincheck.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<html>
<head>
 <title>处理登录页面的数据</title>
</head>
<body bgcolor="pink">
 <%
    //设置请求的编码，永远解决中文乱码问题
    request.setCharacterEncoding("UTF-8");
    String name = request.getParameter("userName");
    String password = request.getParameter("password");
    if(request.getParameter("validationCode1").equals(request.getParameter("validationCode"))){
        if(name.equals("dhy")&&password.equals("666666")){
            session.setAttribute("userName", name);
            response.sendRedirect("main.jsp");
 
        }else{
            response.sendRedirect("login.jsp");
 
        }
    }else{
        response.sendRedirect("login.jsp");
    }
    %>
 </body>
 </html>

exit.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
 <html>
 <head>
 <title>退出系统</title>
</head>
 <body>
 <%
 session.invalidate();//销毁session
 response.sendRedirect("login.jsp");
 %>
 </body>
 </html>

main.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
 <html>
<head>
<title>系统主页面</title>
 </head>
 <body>
<%
 //获取保存在session中的用户名
String name=(String)session.getAttribute("userName");
 %>
 您好<%=name%>,欢迎您访问！<br>
 <a href="exit.jsp">[退出系统]</a>
 </body>
 </html>

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原文地址：https://www.cnblogs.com/DOCEAN/p/12703179.html