Java append attribute and value to existing XML

Question

I need to update an server.xml for Apache tomcat dynamically and add a new attribute and value.. This xml document has many elements with attributes with the same name. For Example multiple connector elements with different attribute values.

<Connector protocol="org.apache.coyote.http11.Http11NioProtocol"
    port="${tomcat.http.port}" 
    connectionTimeout="${tomcat.connection.timeout}"
    maxHttpHeaderSize="20480"
    socket.soKeepAlive="true" 
/>

<Connector protocol="org.apache.coyote.http11.Http11NioProtocol"
    port="${tomcat.basic.https.port}"
    socket.soKeepAlive="true"
    SSLEnabled="true"
    socket.appReadBufSize="17408"
    scheme="https"
    secure="true"
   />

I need to add a new attribute where connector in the element where the port value is ${tomcat.basic.https.port}.

This is what I got so far for finding the correct element.

    DocumentBuilderFactory docFactory = buildDocFact();
    DocumentBuilder docBuilder = null;
    Document doc = null;

    File file = new File(filePath);
    docBuilder = docFactory.newDocumentBuilder();
    doc = docBuilder.parse(file);
    doc.getDocumentElement().normalize();

    XPath xpath = XPathFactory.newInstance().newXPath();
    NodeList nodes =
                (NodeList) xpath.evaluate("//*[contains(@port, 
   '${tomcat.basic.https.port}')]", doc,
                        XPathConstants.NODESET);

        for (int idx = 0; idx < nodes.getLength(); idx++)
        {
            Node value = 
            nodes.item(idx).getAttributes().getNamedItem("port");
            String val = value.getNodeValue();
            logger.info(val);
        }

So the logger.info prints out the correct value so I know I am in the right element.

The question is how do i add append attribute and value to the end of this element?

There doesn't seem to be a create attribute function.

Once we can set the attrib and value, then I can easy save the results to a new xml doc.

    Transformer xformer = TransformerFactory.newInstance().newTransformer();
    xformer.transform(new DOMSource(doc), new StreamResult(new File(outputFile)));

Any ideas how I can append a new attribute and value?

I hope that made sense :)

ajith george · Accepted Answer · 2019-02-19 18:51:54Z

1

You can try ((Element)node).setAttribute("attributeName", "value");

answered Feb 19, 2019 at 18:51

ajith george

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