我有一个包含以下代码的 XML 文件
<Root>
<!DOCTYPE stylesheet [
<!ENTITY CLARK_HISTORICAL_ALLOCATION_CLASS "location.stuff.things">
<!ENTITY CLARK_UNIFORM_ALLOCATION_CLASS "location.stuff.items">
<!ENTITY CLARK_PSEUDO_UNIFORM_ALLOCATION_CLASS "location.items.stuff">
]>
<ServerConfig>
<host name="allen" env="flat"/>
</ServerConfig>
<ClientConfig>
<host name="george" env="flat"/>
<host name="alice" env="flat"/>
<host name="bernice" env="flat"/>
</ClientConfig>
</Root>
我的代码试图忽略 DTD,并通过将文件作为文件输入流读入,将节点添加到文件的 ClientConfig 部分,如下所示:
val factory = javax.xml.parsers.SAXParserFactory.newInstance()
factory.setValidating(false)
factory.setFeature("http://xml.org/sax/features/validation", false)
factory.setFeature("http://apache.org/xml/features/nonvalidating/load-dtd-grammar", false)
factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false)
factory.setFeature("http://xml.org/sax/features/external-general-entities", false)
factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false)
val data = scala.xml.XML.withSAXParser(factory.newSAXParser).load(FileInputstream)
val p = new XMLPrettyPrinter
val added = addNewEntry(data, "bob", "flat")
def toBeAddedEntry(name: String, env: String) = <host name={ name } env={ env } />
def addNewEntry(originalXML: Elem, name: String, env: String) = {
originalXML match {
case e @ Elem(_, _, _, _, configs @ _*) => {
val changedNodes = configs.map {
case <ClientConfig>{ innerConfigs @ _* }</ClientConfig> => {
<ClientConfig> { toBeAddedEntry(name, env) ++ innerConfigs }</ClientConfig>
}
case other => other
}
e.copy(child = changedNodes)
}
case _ => originalXML
}
}
p.write(added)(System.out)
然而,尽管添加了所有这些,DTD 并没有最终被 XML 解析器忽略,而是最终在 XML 文件中展开/解析。为什么不忽略 DTD?
我还想补充一下,我按照这些链接忽略了我的 DTD: