java xml document.getTextContent() stays empty

问题:

I'm trying to build an xml document in a JUnit test.

doc=docBuilder.newDocument();    Element root = doc.createElement("Settings"); doc.appendChild(root);           Element label0 = doc.createElement("label_0"); root.appendChild(label0); String s=doc.getTextContent(); System.out.println(s); 

Yet the document stays empty (i.e. the println yields null.) I don'thave a clue why that is. The actual problem is that a subsequent XPath expression throws the error: Unable to evaluate expression using this context.

回答1:

The return value of getTextContent on Document is defined to null- See Node.

To retreive the text contents call getTextNode on the root element

回答2:

I imagine you want to serialize the document to pass it to the test case. To do this you have to pass your document to an empty XSL transformer, like this:

Transformer transformer = TransformerFactory.newInstance().newTransformer(); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //initialize StreamResult with File object to save to file StreamResult result = new StreamResult(new StringWriter()); DOMSource source = new DOMSource(doc); transformer.transform(source, result); String xmlString = result.getWriter().toString(); System.out.println(xmlString); 

See also: How to pretty print XML from Java?

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