get xml node child element value based on the parent attribute value

Question

I've one xml like:-

 <SkillMap>
   <ExitPoint ID="01">
    <NodeName>abcd</NodeName>
   </ExitPoint>
   <ExitPoint ID="04">
    <NodeName>defg</NodeName>
   </ExitPoint>
   <ExitPoint ID="22">
    <NodeName>mnop</NodeName>
   </ExitPoint>
  </SkillMap>

I am trying to get the value of the <ExitPoint> node based on the ID value i.e. if i enter the ID as 01 it should give "abcd" and if 22 it should give "mnop" and so on, but i'm not getting it, tried lot, please help.

Thanks, Ars

You should you use Xpath for that.

Edwin Dalorzo
– Edwin Dalorzo

2012-06-08 17:13:53 +00:00
Commented Jun 8, 2012 at 17:13 — Edwin Dalorzo
– Edwin Dalorzo, Commented Jun 8, 2012 at 17:13
what you have tried so far? have you faced any issue?

sudmong
– sudmong

2012-06-08 17:17:28 +00:00
Commented Jun 8, 2012 at 17:17 — sudmong
– sudmong, Commented Jun 8, 2012 at 17:17

Edwin Dalorzo · Accepted Answer · 2012-06-08 21:07:10Z

1

You can do it using Xpath, consider the following example taken from the JAXP Specification 1.4 (which I recommend you to consult for this):

// parse the XML as a W3C Document
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
org.w3c.Document document = builder.parse(new File("/widgets.xml"));
// evaluate the XPath expression against the Document
XPath xpath = XPathFactory.newInstance().newXPath();
String expression = "/widgets/widget[@name='a']/@quantity";
Double quantity = (Double) xpath.evaluate(expression, document, XPathConstants.NUMBER);

edited Jun 8, 2012 at 21:07

answered Jun 8, 2012 at 17:17

Edwin Dalorzo

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2 Comments

Ars Over a year ago

thanks but for the above xml whether i've to use String expression = "/ExitPoint/widget[@name='ID']/@quantity"; or wat?

Edwin Dalorzo Over a year ago

I think that if you read the material I have shared in my answer, you will eventually be capable of figuring out yourself. And I think that's the way it should be.

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