%@ taglib prefix=c uri=http://java.sun.com/jsp/jstl/core %會報錯

有些時候，<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>會報錯，錯誤提示為：?
Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"?
主要原因是缺少?
jstl.jar??
standard.jar?
兩個Jar包?

如果還不行，請調整jstl.jar 版本，這個主要根據web的version的版本有關。增加如下?

<jsp-config>??
??????? <taglib>??
??????????? <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>??
??????????? <taglib-location>/WEB-INF/tlds/fmt.tld</taglib-location>??
??????? </taglib>??
??????? <taglib>??
??????????? <taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>??
??????????? <taglib-location>/WEB-INF/tlds/fmt-rt.tld</taglib-location>??
??????? </taglib>??
???????????
??????? <taglib>??
??????????? <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>??
??????????? <taglib-location>/WEB-INF/tlds/c.tld</taglib-location>??
??????? </taglib>??
</jsp-config>