我正在尝试使用 dom4j 1.6.1 使用 XPath 遍历以下文档。我正在寻找<query>
元素的数量。
<?xml version="1.0" encoding="UTF-8"?>
<reportLineageResponse>
<querySet expressionLocale="en-us">
<queries xmlns="http://developer.cognos.com/schemas/report/9.0/">
<query name="Top 10 Sales Staff List"/>
<query name="Top 10 Sales Staff by Quantity List"/>
<query name="Sales Figures America Region Combination Chart"/>
</queries>
</querySet>
</reportLineageResponse>
这是调用 dom4j 的代码。
int numberOfQueries(org.w3c.dom.Document jaxpDocument) {
DOMReader domReader = new DOMReader();
org.dom4j.Document document = domReader.read(jaxpDocument);
Map<String, String> nsMap = Collections.singletonMap("rep", "http://developer.cognos.com/schemas/report/9.0/");
XPath queryXp = document.createXPath("/reportLineageResponse/querySet/rep:queries/rep:query")
queryXp.setNamespaceURIs(nsMap);
List<Node> queries = queryXp.selectNodes(document);
return queries.size();
}
我正确指定了命名空间,但得到 0 个结果。可能是什么问题呢?
编辑:如果我在创建 dom4j.Document 后查看它,它的命名空间错误:
<?xml version="1.0" encoding="UTF-8"?>
<reportLineageResponse>
<querySet expressionLocale="en-us">
<queries xmlns="http://developer.cognos.com/schemas/report/9.0/">
<query xmlns="" name="Top 10 Sales Staff List"/>
<query xmlns="" name="Top 10 Sales Staff by Quantity List"/>
<query xmlns="" name="Sales Figures America Region Combination Chart"/>
</queries>
</querySet>
</reportLineageResponse>
编辑:这是创建 org.w3c.dom.Document 的代码:
Document loadDocument(URL url) {
InputStream stream = url.openStream();
DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document result = docBuilder.parse(stream);
stream.close();
return result;
}