Eclipse需要什么JAR文件才能使用JSTL，因此最终可以在GAE / J上运行？ [英] What JAR files are needed for Eclipse to use JSTL so it ultimately works on GAE/J?

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问题描述

我一直在尝试比我想承认JSTL在Eclipse（最终在GAE / J下）工作的时间更长。我已经下载了Eclipse，Eclipse的Google App Engine扩展版和JSTL（ http： /download.java.net/maven/1/jstl/jars/ - jstl-1.2.jar在WEB-INF \lib目录中）



我的代码与输出一起：

 <％@ taglib uri =http：//java.sun .com / jsp / jstl / coreprefix =c％> 
< HTML>< HEAD>< TITLE>测试页< / TITLE>< / HEAD>< BODY> 
测试页
 
< c：set var =myvarvalue =3/> 
 
< / BODY>< / HTML>

我遇到的错误是：

 在Java Build Path 
测试中找不到c：set（org.apache.taglibs.standard.tag.rt.core.SetTag）的标记处理程序类。 jsp 
 [我的应用程序的路径和名称] 
行8 
 JSP问题

从本页的最后一篇文章我不认为我需要一个standard.jar（ http://forums.sun.com/thread.jspa?threadID=701267 ），在任何情况下，我都无法在Oracle download.java.com网站上找到一个jstl jar。 p>

编辑4：现在工作 - 步骤：

1）使用Apache版本

2）实际上将jar文件包含在构建路径（右键单击eclipse项目并点击属性 - > Java构建路径 - >库 - >添加类文件夹...; war / WEB-INF / lib显然不在默认情况下在构建路径上）

3）将文件c.tld添加到war / WEB-INF / tld



使您的web.xml看起来像：

 < \？xml version =1.0encoding =UTF-8 >？; 
< web-app version =2.4xmlns =http://java.sun.com/xml/ns/j2eexmlns：xsi =http://www.w3.org/2001/ XMLSchema-instancexsi：schemaLocation =http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd\"> 
< display-name> JSTLExample< / display-name> 
< welcome-file-list> 
< welcome-file> index.html< / welcome-file> 
< / welcome-file-list> 
< jsp-config> 
< taglib> 
< taglib-uri> http：//java.sun.com/jstl/core< / taglib-uri> 
< taglib-location> /WEB-INF/tld/c.tld< / taglib-location> 
< / taglib> 
< / jsp-config> 
< / web-app>

测试jsp文件内容：

 <？xml version =1.0encoding =UTF-8？> 
<％@ page language =javacontentType =text / html; charset = UTF-8pageEncoding =UTF-8％> 
 
<！ -  Taglib  - > 
<％@ taglib uri =http://java.sun.com/jstl/coreprefix =c％> 
 
<！DOCTYPE html PUBLIC -  // W3C // DTD XHTML 1.0 Transitional // ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional。 DTD> 
< html xmlns =http://www.w3.org/1999/xhtml> 
< head> 
< meta http-equiv =Content-Typecontent =text / html; charset = UTF-8/> 
< title>使用JSTL< / title>测试Apache ServiceMix 
< / head> 
< body> 
 
这是一个测试页。 
 
<％=hello％> 
< c：forEach var =ibegin =1end =10step =1> 
< c：out value =$ {i}/> 
 
< br /> 
< / c：forEach> 
 
 
< / body> 
< / html>


解决方案

确保您的网页。 xml 根声明符合至少 Servlet 2.4。

 < web -app 
 xmlns =http://java.sun.com/xml/ns/j2ee
 xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance 
 xsi：schemaLocation =http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd
版本= 2.4 > 
 
<！ - 在这里配置。 - > 
 
< / web-app>

或者如果您的servlet容器支持它，则更喜欢2.5：

 < web-app 
 xmlns =http://java.sun.com/xml/ns/javaee
 xmlns：xsi = http://www.w3.org/2001/XMLSchema-instance
 xsi：schemaLocation =http://java.sun.com/xml/ns/javaee http://java.sun.com/ xml / ns / javaee / web-app_2_5.xsd
 version =2.5> 
 
<！ - 在这里配置。 - > 
 
< / web-app>

如果支持最新版本3.0，



$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ http http http http http http http http http http http http http http http http http http http http http http ：//www.w3.org/2001/XMLSchema-instance
xsi：schemaLocation =http://java.sun.com/xml/ns/javaee http://java.sun.com/xml /ns/javaee/web-app_3_0.xsd
version =3.0>

<！ - 在这里配置。 - >

< / web-app>

否则，一切都会回退到最少支持的模式，而taglib可能会这样破坏。



还要确保您没有松动的 tld 在类路径中漫游的文件（ / WEB- INF / lib 文件夹等），它们将与JAR文件中的那些文件冲突。哦，还要确保你没有在 web.xml 中手动定义tld，保持清洁。


I've been trying for longer than I'd like to admit to get JSTL working under Eclipse (and ultimately under GAE/J). I've downloaded Eclipse, the Google App Engine Extension for Eclipse, and JSTL (http://download.java.net/maven/1/jstl/jars/ - jstl-1.2.jar is in the WEB-INF\lib directory).

My code is below along with the output:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<HTML><HEAD><TITLE>Test Page</TITLE></HEAD><BODY>
Test Page

<c:set var="myvar" value="3"/>

</BODY></HTML>

The error I get is:

The tag handler class for "c:set" (org.apache.taglibs.standard.tag.rt.core.SetTag) was not found on the Java Build Path 
test.jsp
[my app's path and name]
line 8
JSP Problem

From the last post on this page I don't think I need a standard.jar (http://forums.sun.com/thread.jspa?threadID=701267) and in any case I couldn't find one on the Oracle download.java.com site along with the jstl jar.

EDIT 4: Works now - Steps:
1) Use the Apache version
2) Actually include the jar file in the build path (right click the eclipse project and hit Properties -> Java Build Path -> Libraries -> Add Class Folder...; the war/WEB-INF/lib is apparently not on the build path by default)
3) Add the file c.tld to war/WEB-INF/tld

Make your web.xml look like:

<\?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>JSTLExample</display-name>
<welcome-file-list>
    <welcome-file>index.html</welcome-file>
</welcome-file-list>
<jsp-config>
    <taglib>
        <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
        <taglib-location>/WEB-INF/tld/c.tld</taglib-location>
    </taglib>
</jsp-config>  
</web-app>

The test jsp file contents:

 <?xml version="1.0" encoding="UTF-8" ?>
 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

 <!-- Taglib -->
 <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
 <title>Test Apache ServiceMix with JSTL</title>
 </head>
 <body>

 This is a testpage.

 <%= "hello" %>
 <c:forEach var="i" begin="1" end="10" step="1">
 <c:out value="${i}" />

 <br />
 </c:forEach>


 </body>
 </html>

解决方案

Ensure that your web.xml root declaration complies at least Servlet 2.4.

<web-app
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <!-- Config here. -->

</web-app>

Or if your servletcontainer supports it, prefer 2.5:

<web-app 
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">

    <!-- Config here. -->

</web-app>

O if it supports the latest version3.0

<web-app 
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">

    <!-- Config here. -->

</web-app>

Otherwise everything will fall back to least supported modus and taglibs may break like that.

Also ensure that you don't have loose tld files wandering around in the classpath (the /WEB-INF/lib folder, among others), they will collide with the ones in JAR files. Oh, also ensure that you didn't manually define the tlds in web.xml, keep it clean.

这篇关于Eclipse需要什么JAR文件才能使用JSTL，因此最终可以在GAE / J上运行？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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