我有一个看起来像这样的 xml:
{ <xml><ep><source type="xml">...</source><source type="text">..</source></ep></xml>}
这里我想检索“源类型”的值,其中 type 是一个属性。
我试过这样,但它不起作用:
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document dDoc = builder.parse("D:/workspace1/ereader/src/main/webapp/configurations/config.xml");
System.out.println(dDoc);
XPath xPath = XPathFactory.newInstance().newXPath();
Node node = (Node) xPath.evaluate("//xml/source/@type/text()", dDoc, XPathConstants.NODE);
System.out.println(node);
} catch (Exception e) {
e.printStackTrace();
我也试过了:
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
InputSource is = new InputSource(new StringReader("config.xml"));
Document doc = builder.parse(is);
NodeList nodeList = doc.getElementsByTagName("source");
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
if (node.hasAttributes()) {
Attr attr = (Attr) node.getAttributes().getNamedItem("type");
if (attr != null) {
String attribute= attr.getValue();
System.out.println("attribute: " + attribute);
}
}
}
请帮帮我!!
提前致谢, 瓦沙。
最佳答案
由于您的问题更通用,因此请尝试使用 Java 中可用的 XML 解析器来实现它。如果您需要它特定于解析器,请在此处更新您已尝试过的代码
<?xml version="1.0" encoding="UTF-8"?>
<ep>
<source type="xml">TEST</source>
<source type="text"></source>
</ep>
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse("uri to xmlfile");
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//ep/source[@type]");
NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nl.getLength(); i++)
{
Node currentItem = nl.item(i);
String key = currentItem.getAttributes().getNamedItem("type").getNodeValue();
System.out.println(key);
}
关于java - 如何使用java获取xml节点的属性值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11863038/