jakarta-ee - JSP taglib 如何找到.tld？

Question

当我们使用下面的编译器指令并且我不在 web.xml 中使用时

<%@ taglib uri="/struts-tags" prefix="s"%>

tomcat 会用它做什么？taglib 如何找到 .tld？它有搜索顺序吗？我想知道原理。谢谢~

Answer 1

Here's the way it works:

The JAR file that contains your tag library has a .tld file, which in turn has a <uri> tag with a string that needs to match the value in your JSP.

For example, the standard JSTL JAR has a c.tld file with this URI:

<uri>http://java.sun.com/jsp/jstl/core</uri>

That's the URI that you need to use the core JSTL tag library.

It has nothing to do with where you put the JARs and everything to do with the .tld.

Answer 2

容器在你的Web应用程序中搜索所有.tld，首先在WEB-INF目录中，然后在WEB-INF的所有子目录中，如果有jar文件他在里面搜索，如果有tld文件。之后，容器映射每个使用 tld 文件找到的 uri。