为什么以下xpath不会在Java中使用Saxon 9.6返回任何结果?使用Saxon进行XPath评估对于节点名称不起作用
//field
奇怪的是我还评价//*
和挂绕在与“场”比较节点名的结果,并得到了889个命中为我的文件。
全codeexample:
初始化和运行测试:
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(file);
test(doc, "//*");
test(doc, "//field");
测试执行代码:
private void test(Document doc, String xpathString) throws Exception {
System.setProperty("javax.xml.xpath.XPathFactory:" + NamespaceConstant.OBJECT_MODEL_SAXON, "net.sf.saxon.xpath.XPathFactoryImpl");
XPathFactory xpf;
xpf = XPathFactory.newInstance(NamespaceConstant.OBJECT_MODEL_SAXON);
XPath xpath = xpf.newXPath();
XPathExpression expr = xpath.compile(xpathString);
Object result = expr.evaluate(doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) result;
int fieldHits = 0;
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
String name = node.getNodeName();
fieldHits = "field".equals(nodes.item(i).getNodeName()) ? fieldHits + 1 : fieldHits;
}
System.out.println("#hits total: " + nodes.getLength());
System.out.println("#hits 'field': " + fieldHits);
}
输出:
#hits total: 26256
#hits 'field': 889
#hits total: 0
#hits 'field': 0
示例XML文档(谢谢到WERO我现在知道它是与命名空间):
<?xml version="1.0" encoding="UTF-8"?>
<?xfa generator="AdobeLiveCycleDesignerES_V9.0.1.0.20091206.1.615263" APIVersion="3.2.9310.0"?>
<xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/" timeStamp="2015-11-17T07:12:49Z" uuid="262c190c-1563-4ae8-ae6e-4c8d59494a3c">
<template xmlns:xliff="urn:oasis:names:tc:xliff:document:1.1" xmlns="http://www.xfa.org/schema/xfa-template/2.8/">
<field name="A"></field>
<field name="B"></field>
<field name="C"></field>
<field name="D"></field>
<field name="E"></field>
<field name="F"></field>
</template>
</xdp:xdp>
谢谢,它确实与名称空间有关。现在我可以创建一个简单的例子。你可以看看吗? :) – sotix
明白了,非常感谢:) – sotix