如何使用Java DOM解析器中的属性名称和标记名称获取标记中的值

Question

this is the xml

<a>  
  <b name="dataSource"> 
    <property name="driverClass">oracle</property>
    <property name="jdbcUrl">jdb:</property>
  </b>
</a>

how to get the value in the tag using the attribute name

for example :oracle

<property name="driverClass">oracle</property>

using tagname property and attribute value driverClass

i want to get oracle

Answer 1

You can use a XPath query, something like /a/b/property[@name='driverClass']/text() which will return the text value of the property node, which has an attribute name equal to driverClass and which is a of child b , which is a child of a

For example...

try {
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    Document doc = dbf.newDocumentBuilder().parse(JavaApplication244.class.getResourceAsStream("/Test.xml"));

    XPathFactory xf = XPathFactory.newInstance();
    XPath xPath = xf.newXPath();
    XPathExpression expression = xPath.compile("/a/b/property[@name='driverClass']/text()");
    String value = expression.evaluate(doc);
    System.out.println(value);
} catch (ParserConfigurationException | SAXException | IOException | XPathExpressionException exp) {
    exp.printStackTrace();
}

Which outputs oracle

Have a look at w3schools, xPath and How XPath Works for some more details

Answer 2

Try this:

XML input:

< nodename attribute="value" > Something </ nodename>

Java code:

NodesList subs = child.item(j).getChildNodes();

System.out.println(subs.item(0).getTextContent()); // >> Something