在 Java 中使用 SAXON Xpath 引擎
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Using SAXON Xpath engine in Java
提问by g andrieu
Here is my code :
这是我的代码：
public static void main(String[] args) {
// System.setProperty(
// "javax.xml.xpath.XPathFactory",
// "net.sf.saxon.xpath.XPathFactoryImpl");
String xml="<root><a>#BBB#</a><a>#CCC#</a><b><a>#DDD#</a></b></root>";
try{
JDocument dom = new JDocument(xml);
XPathFactory factory = net.sf.saxon.xpath.XPathFactoryImpl.newInstance();
XPath xpath = factory.newXPath();
XPathExpression expr = xpath.compile("//a[matches(.,'#...#')]");
Object result = expr.evaluate(dom, XPathConstants.NODESET);
NodeList nodes = (NodeList) result;
Nodes sharped = new Nodes(nodes);
for (Node n:sharped){
System.out.println(n.toString());
}
}
catch(Exception e){
e.printStackTrace();
}
}
And I get this :
我明白了：
javax.xml.transform.TransformerException: Impossible to find the function : matches
at org.apache.xpath.compiler.XPathParser.error(XPathParser.java:608)
at org.apache.xpath.compiler.XPathParser.FunctionCall(XPathParser.java:1505)
at org.apache.xpath.compiler.XPathParser.PrimaryExpr(XPathParser.java:1444)
at org.apache.xpath.compiler.XPathParser.FilterExpr(XPathParser.java:1343)
at org.apache.xpath.compiler.XPathParser.PathExpr(XPathParser.java:1276)
Which means Java is using org.apache.xpath.compiler.XPathParserclass when I clearly created my factory through net.sf.saxon.xpath.XPathFactoryImpl.
这意味着org.apache.xpath.compiler.XPathParser当我通过net.sf.saxon.xpath.XPathFactoryImpl.
(I actually only need to put some matchesin my xpaths... so if any solution not involving Saxon is known, consider my need reached).
（我实际上只需要matches在我的 xpath 中放一些……所以如果有任何不涉及撒克逊的解决方案是已知的，请考虑达到我的需要）。
What am I doing wrong ?
我究竟做错了什么 ？
回答by g andrieu
From Saxon examples :
来自撒克逊的例子：
System.setProperty("javax.xml.xpath.XPathFactory:"+NamespaceConstant.OBJECT_MODEL_SAXON, "net.sf.saxon.xpath.XPathFactoryImpl");
XPathFactory xpf = XPathFactory.newInstance(NamespaceConstant.OBJECT_MODEL_SAXON);
Works fine.
工作正常。
