子树上的xpath搜索 [英] xpath search on subtree

问题描述

我需要将xpath节点搜索限制为子树。我目前正在使用下面的方法，但它会在整个文档中搜索我是否给它提供文档或我要搜索的节点。

I need to restrict the xpath node search to a subtree. I'm currently using the method below but it searches on a whole document regardlest whether I give it the document or the node I want to search from.

private NodeList findNodes(Object obj,String xPathString) throws ... {
    XPath xPath = XPathFactory.newInstance().newXPath();
    XPathExpression expression = xPath.compile(xPathString);
    return (NodeList) expression.evaluate(obj, XPathConstants.NODESET);
}

我现在使用的解决方案是我创建新文档，追加节点并搜索新文档，然后合并。我想改进这个。可以吗？

Solution I'm using now is that I create new document, append the node and search on the new document, then merge. I want to improve this. Can it be done?

我使用的XPath是 // nodeName 。

The XPath I'm using is //nodeName.

推荐答案

您正在//轴上查找'文件根的任何后代节点'，

You're looking on the // axis which means 'any descendant node of the document root',

将其更改为.// axis（上下文节点的后代），它将按预期工作。

Change it to .// axis (descendands of the context node) and it will work as expected.

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