<%@ page contentType="text/html;charset=GB2312" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html>
<head>
<title>测试你的第一个使用到JSTL的网页</title>
</head>
<body>
<c:out value="欢迎测试你的第一个使用到JSTL的网页"/>
</br>你使用的浏览器是：</br>
<c:out value="${header['User-Agent']}"/>
<c:set var="a" value="David O'Davies" />
<c:out value="David O'Davies" escapeXml="true"/>
</body>
</html>代码如上，我的运行结果是
————————————————
“你使用的浏览器是：”————————————————
其他信息出不来。
请帮个忙吧，实在是没分了。
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html>
<head>
<title>测试你的第一个使用到JSTL的网页</title>
</head>
<body>
<c:out value="欢迎测试你的第一个使用到JSTL的网页"/>
</br>你使用的浏览器是：</br>
<c:out value="${header['User-Agent']}"/>
<c:set var="a" value="David O'Davies" />
<c:out value="David O'Davies" escapeXml="true"/>
</body>
</html>代码如上，我的运行结果是
————————————————
“你使用的浏览器是：”————————————————
其他信息出不来。
请帮个忙吧，实在是没分了。
该文件位置：tomcat/webapps/jspbook/ch07/helloJSTL.jsp其他已有的可能相关文件为
webapps/jspbook/WEB-INFO/web.xml
webapps/jspbook/WEB-INFO/lib/jstl.jar
webapps/jspbook/WEB-INFO/lib/standard.jar
webapps/jspbook/WEB-INFO/lib/xalan.jar
其中web.xml下载来时就有的，我没有改动，内容如下：
<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd"><web-app> <display-name>Webdav Content Management</display-name>
<description>
Webdav Content Management
</description> <servlet>
<servlet-name>webdav</servlet-name>
<servlet-class>org.apache.catalina.servlets.WebdavServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<init-param>
<param-name>listings</param-name>
<param-value>true</param-value>
</init-param>
<!-- Uncomment this to enable read and write access -->
<!--
<init-param>
<param-name>readonly</param-name>
<param-value>false</param-value>
</init-param>
-->
<!--load-on-startup>1</load-on-startup-->
</servlet> <!-- The mapping for the webdav servlet -->
<!-- Using /* as the mapping ensures that jasper, welcome files etc are
over-ridden and all requests are processed by the webdav servlet.
This also overcomes a number of issues with some webdav clients
(including MS Webfolders) that do not respond correctly
to the
redirects (302) that result from using a mapping of / -->
<servlet-mapping>
<servlet-name>webdav</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping> <!-- ================ Security Constraints for Testing =============== --><!--
<security-constraint>
<web-resource-collection>
<web-resource-name>The Entire Web Application</web-resource-name>
<url-pattern>/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>tomcat</role-name>
</auth-constraint>
</security-constraint> <login-config>
<auth-method>BASIC</auth-method>
<realm-name>Tomcat Supported Realm</realm-name>
</login-config> <security-role>
<description>
An example role defined in "conf/tomcat-users.xml"
</description>
<role-name>tomcat</role-name>
</security-role>
--> <welcome-file-list>
<welcome-file/>
</welcome-file-list> </web-app>