Xml parsing includes inline parsing
Question
Using:
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
how can i extract xml data? for example for this xml file:
<request method="POST" url="/devices/test/planner" body="*">
<response statusCode="200">
<header>
<headerParameters>
<headerParameter name="Content-Type">Content-Type=application/xml</headerParameter>
</headerParameters>
</header>
<body>booking created!</body>
</response>
</request>
how do i extract the data simply? Also how can i extract data from inline row?
<request method="POST" url="/devices/test/planner" body="*">
Thanks?
2 answers
solution1
2 ACCPTED 2012-01-09 02:52:02
I second the recommendation to use XPath. You could manually traverse the DOM, but why? XPath was designed to solve this problem. Here's a complete Java/ JAXP /XPath example ( sans error-checking and exception handling):
import java.io.IOException;
import java.io.StringReader;
import javax.xml.parsers.*;
import javax.xml.xpath.*;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class Xpather {
public static void main(String[] args)
throws XPathExpressionException, ParserConfigurationException,
SAXException, IOException {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource("workbook.xml"));
XPath xpath = XPathFactory.newInstance().newXPath();
Node body = (Node) xpath.evaluate("/request/response/body", doc,
XPathConstants.NODE);
System.out.println(body.getTextContent());
Node url = (Node) xpath.evaluate("/request/@url", doc,
XPathConstants.NODE);
System.out.println(url.getNodeValue());
}
}
This code prints the contents of the body element and the value of the url attribute on the request element.
Output:
booking created!
/devices/test/planner
solution2
1 2012-01-08 20:02:59
Use XPath - also readily available through standard Java APIs . Once you have your Document , Java's XPath can evaluate directly off of it - so having your DocumentBuilder and such will still be used.
For example, you can obtain just the <request/> element, using /request , or the request's URL, using something like /request/@url .
An alternative - especially for high-performance usage scenarios where you may be processing many documents following the same schema - is to use SAX parsing instead, where you will receive an event for every XML element processed, and given its name and list of attributes.
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