我有一个函数，在这个函数中，我使用Xpath获取节点的位置如下：
Node goTo;
.....
private Node xpathgo(Node node) throws XPathExpressionException {
XPath xpath = XPathFactory.newInstance().newXPath();
Node result;
if (node == null || node.getNodeName() == null){
return null;
}
xpathgo(node.getFirstChild());
result = (Node) xpath.evaluate("//*[. = \"" + goTo.getNodeValue() + "\"]", node,XPathConstants.NODE);
xpathgo(node.getNextSibling());
return result;
}
基本上我用它来获取一个由URL html代码制作的DOM节点，但是我遇到了两个问题，首先，有时我得到这个例外：
Exception in thread "main" java.lang.RuntimeException: Could not resolve the node to a handle
at com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault.getDTMHandleFromNode(DTMManagerDefault.java:574)
at com.sun.org.apache.xpath.internal.XPathContext.getDTMHandleFromNode(XPathContext.java:182)
at com.sun.org.apache.xpath.internal.XPath.execute(XPath.java:301)
at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.eval(XPathImpl.java:210)
at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.java:275)
以及其他一些节点：
Caused by: javax.xml.transform.TransformerException: Expected ], but found: the
at com.sun.org.apache.xpath.internal.compiler.XPathParser.error(XPathParser.java:608)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.consumeExpected(XPathParser.java:526)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.Predicate(XPathParser.java:1935)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.Step(XPathParser.java:1724)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelativeLocationPath(XPathParser.java:1624)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.LocationPath(XPathParser.java:1595)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.PathExpr(XPathParser.java:1315)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnionExpr(XPathParser.java:1234)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.UnaryExpr(XPathParser.java:1140)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.MultiplicativeExpr(XPathParser.java:1061)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.AdditiveExpr(XPathParser.java:1003)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.RelationalExpr(XPathParser.java:928)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.EqualityExpr(XPathParser.java:868)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.AndExpr(XPathParser.java:832)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.OrExpr(XPathParser.java:805)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.Expr(XPathParser.java:788)
at com.sun.org.apache.xpath.internal.compiler.XPathParser.initXPath(XPathParser.java:127)
at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:176)
at com.sun.org.apache.xpath.internal.XPath.<init>(XPath.java:264)
at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.eval(XPathImpl.java:193)
at com.sun.org.apache.xpath.internal.jaxp.XPathImpl.evaluate(XPathImpl.java:275)
... 7 more
但有趣的是，在展位的情况下，节点是一个[#text]节点，让我感到困惑，为什么会发生这种情况。