在Java中使用SAXON Xpath引擎
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="#BBB##CCC##DDD#"; 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(); } } 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)
这意味着当我通过net.sf.saxon.xpath.XPathFactoryImpl清楚地创建我的工厂时，Java正在使用org.apache.xpath.compiler.XPathParser类。
（我实际上只需要在我的xpaths中添加一些matches …所以如果任何不涉及Saxon的解决方案已知，请考虑我的需求。）
我究竟做错了什么 ？
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);
工作良好。