Modify XML file using Java

Question

I want to add a node in the last line of an existing XML file using Java. So I have followed the code below.

Sample XML file :

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <mapping-configuration>
   <fields-mapping>
      <field compare="true" criteria="true" displayName="demo1"/>
      <field compare="true" criteria="true" displayName="demo2"/>
   </fields-mapping>
 </mapping-configuration>

Code :

    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(new File("C:/Desktop/test.xml"));  
    System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
    Node nList = doc.getDocumentElement().getChildNodes().item(0).getLastChild();
    System.out.println(nList.getNodeName());        
    Element newserver=doc.createElement("field");
    newserver.setAttribute("source", "33");
    nList.appendChild(newserver).normalize();
    TransformerFactory tf = TransformerFactory.newInstance();
    Transformer transformer = tf.newTransformer();
    DOMSource source = new DOMSource(doc);          
    StreamResult result = new StreamResult(new File("C:/Desktop/test.xml")); 
    transformer.transform(source, result);

So, I got the result as

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <mapping-configuration>
     <fields-mapping>
        <field compare="true" criteria="true" displayName="demo1"/>
        <field compare="true" criteria="true" displayName="demo2">
        <field source="33"/>
        </field>  
     </fields-mapping>
 </mapping-configuration>

But my expected Output should be

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <mapping-configuration>
     <fields-mapping>
        <field compare="true" criteria="true" displayName="demo1"/>
        <field compare="true" criteria="true" displayName="demo2"/>
        <field source="33"/> 
     </fields-mapping>
 </mapping-configuration>

Michael Kay · Accepted Answer · 2018-04-10 11:25:30Z

1

In this code:

Node nList = doc.getDocumentElement().getChildNodes().item(0).getLastChild();

selects the last field element, and this:

 nList.appendChild(newserver);

adds your new element as a child of the last field element.

you want the new node as a child of the fields-mapping element, so try removing the unwanted .getLastChild().

answered Apr 10, 2018 at 11:25

Michael Kay

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