JSP中param动作的实例详解
一 语法
jsp:param name="参数名" value="参数值">
常常与jsp:forward>一起使用，作为其子标签存在。
二 代码
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>系统登录/h1>
hr>
form name="loginForm" action="dologin.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="password" name="password"/>/td>
/tr>
tr>
td colspan="2">input type="submit" value="登录"/>/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>用户资料/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");
}
%>
用户名：%=username %>br>
密码：%=password %>br>
电子邮箱：%=email %>br>
/body>
/html>
三 运行结果
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