JSP中param動作的實例詳解

2020-07-27 21:19:50

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JSP中param動作的實例詳解

一語法

<jsp:param name="參數名" value="參數值">

常常與<jsp:forward>一起使用，作為其子標簽存在。

二代碼

1、login.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+"/";%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head>  <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >    <title>My JSP 'login.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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >    -->  </head>  <body>  <h1>系統登錄</h1>  <hr>  <form name="loginForm" action="dologin.jsp" method="post">   <table>    <tr>     <td>用戶名：</td>     <td><input type="text" name="username"/></td>    </tr>    <tr>     <td>密碼：</td>     <td><input type="password" name="password"/></td>    </tr>    <tr>     <td colspan="2"><input type="submit" value="登錄"/></td>    </tr>   </table>  </form> </body></html>

2、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+"/";%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head>  <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >    <title>My JSP 'dologin.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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >    -->  </head>  <body>  <jsp:forward page="user.jsp">   <jsp:param value="admin@123.net" name="email"/>   <jsp:param value="888888" name="password"/>  </jsp:forward> </body></html>

3、user.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+"/";%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head>  <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >    <title>My JSP 'user.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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >    -->  </head>  <body>  <h1>用戶資料</h1>  <hr>  <%    request.setCharacterEncoding("utf-8");    String username = "";    String password = "";    String email = "";    if(request.getParameter("username")!=null)    {     username = request.getParameter("username");    }    if(request.getParameter("password")!=null)    {     password = request.getParameter("password");    }    if(request.getParameter("email")!=null)    {     email = request.getParameter("email");    }     %>    用戶名：<%=username %><br>    密碼：<%=password %><br>    電子郵箱：<%=email %><br> </body></html>

三運行結果