我想在我们的代码库中重用一些现有代码,这些代码接受XMLStreamReader
我的应用程序具有所需数据作为 w3c 文档。
下面的例子是一个最小的测试用例:
public static void main(String[] args) throws Exception {
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document doc = builder.newDocument();
Element rootElement = doc.createElement("Groups");
doc.appendChild(rootElement);
Element group = doc.createElement("Group");
group.setTextContent("Wibble");
rootElement.appendChild(group);
DOMSource source = new DOMSource(doc);
XMLStreamReader reader = XMLInputFactory.newInstance().createXMLStreamReader(source);
reader.nextTag();
System.out.println("NextTag:" + reader.getName());
}
预期的输出应该是这样的:NextTag:Groups
但是会抛出以下内容:
Exception in thread "main" javax.xml.stream.XMLStreamException: java.net.MalformedURLException
at com.sun.xml.stream.XMLReaderImpl.setInputSource(XMLReaderImpl.java:196)
at com.sun.xml.stream.XMLReaderImpl.<init>(XMLReaderImpl.java:179)
at com.sun.xml.stream.ZephyrParserFactory.createXMLStreamReader(ZephyrParserFactory.java:139)
at Main.main(Main.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.net.MalformedURLException
at java.net.URL.<init>(URL.java:601)
at java.net.URL.<init>(URL.java:464)
at java.net.URL.<init>(URL.java:413)
at com.sun.xml.stream.XMLEntityManager.startEntity(XMLEntityManager.java:762)
at com.sun.xml.stream.XMLEntityManager.startDocumentEntity(XMLEntityManager.java:697)
at com.sun.xml.stream.XMLDocumentScannerImpl.setInputSource(XMLDocumentScannerImpl.java:300)
at com.sun.xml.stream.XMLReaderImpl.setInputSource(XMLReaderImpl.java:193)
... 8
当前使用 Java 6 更新 22。
更多信息:ZephyrParserFactory#jaxpSourcetoXMLInputSource的来源似乎表明 Source 对象是通过处理它SystemId
而不是 DOMSource 的实际内容来转换的。
更新:我上面的原始测试用例实际上是使用我的项目类路径运行的,该类路径实际上包括 JAXB 2.2.1 库,而后者又引入了 sjsxp 1.0.1。在干净的类路径上运行会产生:
Exception in thread "main" java.lang.UnsupportedOperationException: Cannot create XMLStreamReader or XMLEventReader from a javax.xml.transform.dom.DOMSource
at com.sun.xml.internal.stream.XMLInputFactoryImpl.jaxpSourcetoXMLInputSource(XMLInputFactoryImpl.java:302)
at com.sun.xml.internal.stream.XMLInputFactoryImpl.createXMLStreamReader(XMLInputFactoryImpl.java:145)
这符合@Gary Rowe 的回答。