我想用 XmlSlurper 解析我使用 HTTPBuilder 阅读的 HTML 文档。最初我尝试这样做：
def response = http.get(path: "index.php", contentType: TEXT)
def slurper = new XmlSlurper()
def xml = slurper.parse(response)
但它会产生一个异常：
java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
我找到了一种解决方法来提供缓存的 DTD 文件。我找到了一个简单的类实现，在这里应该有所帮助：
class CachedDTD {
/**
* Return DTD 'systemId' as InputSource.
* @param publicId
* @param systemId
* @return InputSource for locally cached DTD.
*/
def static entityResolver = [
resolveEntity: { publicId, systemId ->
try {
String dtd = "dtd/" + systemId.split("/").last()
Logger.getRootLogger().debug "DTD path: ${dtd}"
new org.xml.sax.InputSource(CachedDTD.class.getResourceAsStream(dtd))
} catch (e) {
//e.printStackTrace()
Logger.getRootLogger().fatal "Fatal error", e
null
}
}
] as org.xml.sax.EntityResolver
}
我的包树如下所示：
我还修改了一些用于解析响应的代码，所以它看起来像这样：
def response = http.get(path: "index.php", contentType: TEXT)
def slurper = new XmlSlurper()
slurper.setEntityResolver(org.yuri.CachedDTD.entityResolver)
def xml = slurper.parse(response)
但现在我得到了java.net.MalformedURLException。从 CachedDTD entityResolver 记录的 DTD 路径是org/yuri/dtd/xhtml1-transitional.dtd，我无法让它工作......