http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed wit
异常：The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this application
这是因为页面中用了struts标签的原因。
解决方法：
1。下载jstl1.1 解压后把lib文件夹下的jstl.jar和standard.jar复制到项目的WEB—INF/lib目录下，到此结束就行，如果还需要tld等。再做以下操作。(并把tld文件夹下的c.tld放到WEB—INF目录下)
2。在web.xml中加入如下语句
<jsp-config>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/xml</taglib-uri>
<taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/fmt</taglib-uri>
<taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jsp/jstl/sql</taglib-uri>
<taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>
</jsp-config>
jstl 下载：http://jakarta.apache.org/site/downloads/downloads_taglibs-standard.cgi