每当我运行下面的代码时,如果它找到了单词,它会给我一个Illegalargument异常,但是如果没有匹配,它将一直运行到没有错误结束。任何人都可以帮我找出解决方案吗?
public static void main(String[] args) throws MalformedURLException, SAXNotRecognizedException, SAXNotSupportedException, ParserConfigurationException, IOException, SAXException, XPathExpressionException {
Parser p = new Parser();
SAX2DOM sax2dom = null;
org.w3c.dom.Node doc = null;
URL url = new URL("http://stackoverflow.com/users/1042952/mostafa");
p.setFeature(Parser.namespacesFeature, false);
p.setFeature(Parser.namespacePrefixesFeature, false);
sax2dom = new SAX2DOM();
p.setContentHandler(sax2dom);
p.parse(new InputSource(new InputStreamReader(url.openStream())));
doc = sax2dom.getDOM();
final String term = "mostafa";
String expression = "//*[contains(text(),$term)]";
final QName termVariableName = new QName("term");
class TermResolver implements XPathVariableResolver {
@Override
public Object resolveVariable(QName variableName) {
return termVariableName.equals(variableName) ? term : null;
}
}
javax.xml.xpath.XPath xpath = XPathFactory.newInstance().newXPath();
xpath.setXPathVariableResolver(new TermResolver());
Node node = (Node) xpath.evaluate(expression, p, termVariableName);
System.out.println("her is it"+node);
}
答案 0 :(得分:0)
1)您的即时错误是由于传递给evaluate
的非法结果类型造成的。来自the docs:
如果returnType不是XPathConstants中定义的类型之一( NUMBER,STRING,BOOLEAN,NODE或NODESET)然后是 抛出IllegalArgumentException。
2)evaluate
的第二个参数应该是一个上下文节点,而不是解析器。
使用类似的东西:
Node node = (Node) xpath.evaluate(expression, doc, XPathConstants.NODE);
注意:您可能打算将Mostafa
大写。