XPath: extract multiple child node values

Question

I'm trying to extract values from <to> multiple nodes using XPath but what I have got is only first value

SOAP looks like:

<addressBlock xmlns:i="http://www.w3.org/2001/XMLSchema-instance" s:relay="1">
    <from>mailto:[email protected]</from>
    <to>mailto:[email protected]</to>
    <to>mailto:[email protected]</to>
</addressBlock>

My code looks like:

private String extractFieldFromXml(Document doc, XPath xPath, String expression)
{
    try
    {
        Node node = (Node) xPath.compile(expression).evaluate(doc, XPathConstants.NODE);
        return node == null ? null : node.getTextContent();
    } catch (XPathExpressionException e)
    {
        log.info(e.getMessage());
        return null;
    }

}

Then I have tried to do that:

String to = extractFieldFromXml(doc, xpath, msgExpression);

for (Iterator<String> to = to.iterator(); to.hasNext();) {
   String value = to.next();
   System.out.println(value);
}

zx485 · Accepted Answer · 2018-04-17 20:49:21Z

1

The XPath to get all to values is

/addressBlock/to

This expression returns a concatenation of to/text() strings.
Use Java to run a for-each over all items of this result.

answered Apr 17, 2018 at 20:49

zx485

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3 Comments

JackTheKnife Over a year ago

And what is an iterator in this case? I have updated my question with the code which extracts values for selected node.

zx485 Over a year ago

I'm sorry, I cannot test it at the moment. But one approach can be described in this SO answer. So evaluate the XPath to a NodeList and pass that to the iterator - so operate on Nodes instead of Strings and get the text content only at the last step.

JackTheKnife Over a year ago

Yeah, that make a sense. I will try that approach and update with results.

JackTheKnife · Accepted Answer · 2018-04-18 19:50:25Z

In case if somebody is going to looking for solution working code is below:

private String extractFieldFromXml(Document doc, XPath xPath, String expression)
{
    if (expression.equals(RECIPIENT_EXPRESSION)) {
        try
        {
            NodeList nodes = (NodeList) xPath.evaluate(expression,doc, XPathConstants.NODESET);

            ArrayList<String> recipientsList = new ArrayList<String>();

            for (int i = 0; i < nodes.getLength(); i++){

                Node node = nodes.item(i);
                if (node != null) {
                    String recipient = node.getTextContent();
                    recipientsList.add(recipient);
                }
            }

            String recipients = StringUtils.join(recipientsList,",");
            return recipients == null ? null: recipients;

        } catch (XPathExpressionException e)
        {
            log.info(e.getMessage());
            return null;
        }
    }
    else {
        try
        {
            Node node = (Node) xPath.compile(expression).evaluate(doc, XPathConstants.NODE);
            return node == null ? null : node.getTextContent();
        } catch (XPathExpressionException e)
        {
            log.info(e.getMessage());
            return null;
        }
    }
}

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