str2dom.html

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<TITLE>Converting an XML Fragment into a DOM Fragment
(Java Developers Almanac Example)
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  <h3>
    e512.  
    Converting an XML Fragment into a DOM Fragment</h3>

This example demonstrates how to parse an XML string fragment into a
set of nodes suitable for insertion into a DOM document.


<pre>
    // Parses a string containing XML and returns a DocumentFragment
    // containing the nodes of the parsed XML.
    public static DocumentFragment parseXml(Document doc, String fragment) {
        // Wrap the fragment in an arbitrary element
        fragment = "&lt;fragment&gt;"+fragment+"&lt;/fragment&gt;";
        try {
            // Create a DOM builder and parse the fragment
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            Document d = factory.newDocumentBuilder().parse(
                new InputSource(new StringReader(fragment)));
    
            // Import the nodes of the new document into doc so that they
            // will be compatible with doc
            Node node = doc.importNode(d.getDocumentElement(), true);
    
            // Create the document fragment node to hold the new nodes
            DocumentFragment docfrag = doc.createDocumentFragment();
    
            // Move the nodes into the fragment
            while (node.hasChildNodes()) {
                docfrag.appendChild(node.removeChild(node.getFirstChild()));
            }
    
            // Return the fragment
            return docfrag;
        } catch (SAXException e) {
            // A parsing error occurred; the xml input is not valid
        } catch (ParserConfigurationException e) {
        } catch (IOException e) {
        }
        return null;
    }
</pre>
Here's an example that uses the method:

<pre>
    // Obtain an XML document; this method is implemented in
    // <a href="../javax.xml.parsers/BasicDom.html" class="eglink"><font size="-1"><b>e510</b> The Quintessential Program to Create a DOM Document from an XML File</font></a>
    Document doc = <font color="#0066ff"><i>parseXmlFile</i></font>(<font color="#0066ff"><i>"infilename.xml"</i></font>, <font color="#0066ff"><i>false</i></font>);
    
    // Create a fragment
    DocumentFragment frag = parseXml(doc, <font color="#0066ff"><i>"hello &lt;b&gt;joe&lt;/b&gt;"</i></font>);
    
    // Append the new fragment to the end of the root element
    Element element = doc.getDocumentElement();
    element.appendChild(frag);
    
</pre>
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            &nbsp;Related Examples
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e510. <a class="eglink" href="BasicDom.html?l=rel">
    The Quintessential Program to Create a DOM Document from an XML File
</a>
<br>

e511. <a class="eglink" href="CreateDom.html?l=rel">
    Creating an Empty DOM Document
</a>
<br>

e513. <a class="eglink" href="SetError.html?l=rel">
    Handling Errors While Parsing an XML File
</a>
<br>


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        See also: 
<a class="eglink" href="/egs/javax.xml.parsers/pkg.html?l=rel#DOM%20Parsing%20Options">
    DOM Parsing Options
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.xml.parsers/pkg.html?l=rel#SAX">
    SAX
</a>&nbsp;&nbsp;

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