首先，在检查节点名称时，您不应
String使用进行比较
==。请始终使用该
equals方法。
您可以在以下位置使用XPath评估文档
topic元素
listOfDocs：
XPathFactory xPathFactory = XPathFactory.newInstance();XPath xPath = xPathFactory.newXPath();XPathexpression xPathexpression = xPath.compile("//listOfDocs//document/topic");NodeList topicnl = (NodeList) xPathexpression.evaluate(dom, XPathConstants.NODESET);for(int i = 0; i < topicnl.getLength(); i++) { ...
