注意 :将 xml-apis.jar 和 xercesImpl.jar 这两个放到对应lib目录即可(或者加入classpath);不
然报错 : Unable to validate using XSD: Your JAXP provider
[org.apache.crimson.jaxp.DocumentBuilderFactoryImpl@18aaa1e] does not
support XML Schema. Are you running on Java 1.4 or below with Apache
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