Use of @ for attribute in XPath
In the previous section of XPath tutorial we have studied how to show all elements of an XML file. In this section we are describing you the use of @ for attribute in the XPath query. The "@" selects attribute.
In this example we have created an XML file "person.xml" as in our previous section, which is necessary to execute XPath query on to it. This "persons.xml" contains information related to name, age, gender of different persons.
Here is the full source code for persons.xml file as follows :
persons.xml
<?xml version="1.0" ?> |
Now we have declared a class XPathAttribute and
in this class we are parsing the XML file with JAXP. First of all we need
to load the document into DOM Document object. We have put that
persons.xml file in that current working directory.
DocumentBuilderFactory domFactory = |
Above lines of code parses "persons.xml"
file and creates a Document object. Next we have created XPath object
with the use of XPathFactory.
XPath xpath = XPathFactory.newInstance().newXPath(); |
We want to show all elements with attribute
id="3" of the person so we can write this in the XPath query as :
"//person[@id='3']/*" -it will fetch
all elements with person id="3" .
Full example code is given as below:
XPathAttribute.java
import org.w3c.dom.*;
|
To run this example :
- create and save persons.xml
- create and save XPathAttribute.java and
- compile XPathAttribute and after compilation execute it
output would be like this:
Output: