今天在web.xml中配置过滤器的时候出现了这个错误：
cvc-complex-type.2.3:Element 'filter-mapping' cannot have character [children],because the type's content type is element-only.
cvc-complex-t
阅读背景：
cvc-complex-type.2.3:Element \'filter-mapping\' cannot have character [children],because the type\'s content type is element-onl
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