Java: how to locate an element via xpath string on org.w3c.dom.document
How do you quickly locate element/elements via xpath string on a given org.w3c.dom.document? there s开发者_运维百科eems to be no FindElementsByXpath() method. For example
/html/body/p/div[3]/a
I found that recursively iterating through all the child node levels to be quite slow when there are lot of elements of same name. Any suggestions?
I cannot use any parser or library, must work with w3c dom document only.
Try this:
//obtain Document somehow, doesn't matter how
DocumentBuilder b = DocumentBuilderFactory.newInstance().newDocumentBuilder();
org.w3c.dom.Document doc = b.parse(new FileInputStream("page.html"));
//Evaluate XPath against Document itself
XPath xPath = XPathFactory.newInstance().newXPath();
NodeList nodes = (NodeList)xPath.evaluate("/html/body/p/div[3]/a",
doc, XPathConstants.NODESET);
for (int i = 0; i < nodes.getLength(); ++i) {
Element e = (Element) nodes.item(i);
}
With the following page.html file:
<html>
<head>
</head>
<body>
<p>
<div></div>
<div></div>
<div><a>link</a></div>
</p>
</body>
</html>
加载中,请稍侯......
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