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POWhy I can't take the content of a tag using XPath in a Java method?
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  1. POWhy I can't take the content of a tag using XPath in a Java method?
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    copied!<p>I am very new in <strong>XPath</strong> and I have the following problem:</p> <p>I have a Java method that receives data from a webservices and these data are in a XML document, so I have to use XPath to take a specific value inside this XML result document.</p> <p>In particular I have that this is the entire XML output provided by my web service (the web service response):</p> <pre><code>&lt;s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"&gt; &lt;s:Body&gt; &lt;getConfigSettingsResponse xmlns="http://tempuri.org/"&gt; &lt;getConfigSettingsResult&gt;&lt;![CDATA[&lt;root&gt; &lt;status&gt; &lt;id&gt;0&lt;/id&gt; &lt;message&gt;&lt;/message&gt; &lt;/status&gt; &lt;drivers&gt; &lt;drive id="tokenId 11"&gt; &lt;shared-secret&gt;Shared 11&lt;/shared-secret&gt; &lt;encoding&gt;false&lt;/encoding&gt; &lt;compression /&gt; &lt;/drive&gt; &lt;drive id="tokenId 2 "&gt; &lt;shared-secret&gt;Shared 2 &lt;/shared-secret&gt; &lt;encoding&gt;false&lt;/encoding&gt; &lt;compression&gt;false&lt;/compression&gt; &lt;/drive&gt; &lt;/drivers&gt; &lt;/root&gt;]]&gt;&lt;/getConfigSettingsResult&gt; &lt;/getConfigSettingsResponse&gt; &lt;/s:Body&gt; &lt;/s:Envelope&gt; </code></pre> <p>Now in a Java class I perform the following operations:</p> <pre><code>XPath xPath; // An utility class for performing XPath calls on JDOM nodes Element objectElement; // An XML element //xPath = XPath.newInstance("s:Envelope/s:Body/getVersionResponse/getVersionResult"); try { // XPath selection: xPath = XPath.newInstance("s:Envelope/s:Body"); xPath.addNamespace("s", "http://schemas.xmlsoap.org/soap/envelope/"); objectElement = (Element) xPath.selectSingleNode(documentXML); if (objectElement != null) { result = objectElement.getValue(); System.out.println("RESULT:"); System.out.println(result); } } catch (JDOMException e) { // TODO Auto-generated catch block e.printStackTrace(); } </code></pre> <p>and the result of printing the content of the <strong>result</strong> variable is this output:</p> <pre><code>RESULT: &lt;root&gt; &lt;status&gt; &lt;id&gt;0&lt;/id&gt; &lt;message&gt;&lt;/message&gt; &lt;/status&gt; &lt;drivers&gt; &lt;drive id="tokenId 11"&gt; &lt;shared-secret&gt;Shared 11&lt;/shared-secret&gt; &lt;encoding&gt;false&lt;/encoding&gt; &lt;compression /&gt; &lt;/drive&gt; &lt;drive id="tokenId 2 "&gt; &lt;shared-secret&gt;Shared 2 &lt;/shared-secret&gt; &lt;encoding&gt;false&lt;/encoding&gt; &lt;compression&gt;false&lt;/compression&gt; &lt;/drive&gt; &lt;/drivers&gt; &lt;/root&gt; </code></pre> <p>Now my problem is that I want to access only ad the content of the <strong>0</strong> tag, so I want that (in this case) my <strong>result</strong> variable have to contain the <strong>0</strong> value.</p> <p>But I can't, I have try to change the previous XPath selection with:</p> <pre><code>xPath = XPath.newInstance("s:Envelope/s:Body/s:status/s:id"); </code></pre> <p>But doing in this way I obtain that my <strong>objectElement</strong> is <strong>null</strong></p> <p>Why? What am I missing? What have I to do to obtain that mu result variable contains the content of the <strong>id</strong> tag?</p> <p>Tnx</p> <p>Andrea</p>
 

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