How to get value in XML using Java?

Question

I have tried a lot of times but I did not how to retrive a value from XML using Java. I tried to use DOM and Xpath. Please help. I can use a String Writer to printout the XML so I know the XML is not empty.

Document doc = parseXML(connection.getInputStream());

doc.getDocumentElement().normalize();
System.out.println("Root element :" + doc.getDocumentElement().getNodeName());

XPath xPath = XPathFactory.newInstance().newXPath();
XPathExpression expr = xPath.compile("/xml_api_reply/weather/current_conditions/temp_f/text()");


Object result = expr.evaluate(doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) result;
for (int i = 0; i < nodes.getLength(); i++) {
    System.out.println(nodes.item(i).getNodeValue()); 
}

The content of XML :

<xml_api_reply version="1">
  <weather module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1" row="0" section="0">
    <current_conditions>
        <condition data="Clear"/>
        <temp_f data="49"/>
        <temp_c data="9"/>
    </current_conditions>
  </weather>
</xml_api_reply>

It seems that it did not go in to the for loop because nodes is null.

You may write a simple helper class to accomplish your task around DOM. See this stackoverflow.com/a/8346867/851432 — Jomoos
– Jomoos, Commented Dec 1, 2011 at 19:20

nd. · Accepted Answer · 2011-11-14 12:31:51Z

4

Your XPath expression evaluates to the (non existant) text-nodes underneath temp_f. Yet, you need the value of the data attribute:

/xml_api_reply/weather/current_conditions/temp_f/@data

may do the trick.

answered Nov 14, 2011 at 12:31

nd.

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Chinmoy · Accepted Answer · 2011-11-14 12:32:47Z

0

Did you try this implementation?

http://www.mkyong.com/java/how-to-read-xml-file-in-java-dom-parser/

answered Nov 14, 2011 at 12:32

Chinmoy

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1 Comment

G_H Over a year ago

What does that really have to do with the question?

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