这个问题是taglib指定的uri找不到导致的，所以我们可以自己指定uri，也就是指定tld描述文件所在位置。
解决办法：
直接将解压出来的tld文件放到WEB-INF下，或者放到WEB-INF下的新建文件夹中即可
1.第一步：从jstl-impl.jar包中获取以下文件
2.第二步，把文件复制到WEB-INF下
3.重启即可
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