JSP内置对象阶段案例

Posted 2020-10-27 sunshine_96

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1.login2：

<%@ 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 \'login2.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">
    -->

</head>

<body>
    <form action="JSP/login2_temp.jsp" method="post">
        <table>
            <tr>
                <td>用户名：</td>
                <td><input type="text" name="username" />
                </td>
            </tr>
            <tr>
                <td>密码</td>
                <td><input type="text" name="password" /></td>
            </tr>
            <tr>
            <td><input  type="submit"/></td></tr>
        </table>
    </form>
</body>
</html>

2.login_temp：（注意判断是否为空再加入session中）

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
    String username = "";
    String password = "";
    username = request.getParameter("username");
    password = request.getParameter("password");
    if(username!=null){
        session.setAttribute("loginuser", username);
    }
    if("admin".equals(username)&&"admin".equals(password)){
        request.getRequestDispatcher("login2_success.jsp").forward(request, response);
    }else{
        response.sendRedirect("login2_failure.jsp");
    }
    
%>

3.login_seccess：

<%@ 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 \'login2_success.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">
    -->

  </head>
  
  <body>
   <h1>欢迎<%=session.getAttribute("loginuser") %> 登陆成功</h1>
  </body>
</html>

4.login2_failure:

<%@ 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 \'login2_failure.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">
    -->

  </head>
  
  <body>
    <h1>登陆失败，请检查您的用户名和密码</h1>
  </body>
</html>

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