使用 java 删除 XML 根的子级

这是我的 xml 文件。

- <deviceparameters>
       - <parameter componenttype="TextBox">
         <name>Operating Type</name> 
         <oid>1.3.6.1.4.1.31163.5.1.1</oid>  
         <writable>true</writable> 
         <description>The operating type defines which waveform type is used. This configuration takes several seconds to execute</description> 
       - <paramvalues type="Integer">
            <value default="No">123</value> 
         </paramvalues>
         </parameter>

       - <parameter componenttype="TextBox">
         <name>Active Waveform Status</name> 
         <oid>1.3.6.1.4.1.31163.5.1.2</oid> 
         <writable>false</writable> 
         <description>Show the status of the waveform configured by operatingType</description> 
       - <paramvalues type="String">
            <value default="yes">Active</value> 
      </paramvalues>
      </parameter>
    </deviceparameters>

我想删除名为 ' 的节点Active wavwform Status'。如何从 xml 中删除该特定节点。

我写的代码如下。

rootElement = doc.getDocumentElement();
NodeList nList = doc.getElementsByTagName("parameter");
String nodeName = TF_name.getText();


System.out.println(""+nList.getLength());

for (int temp = 0; temp < nList.getLength();temp++)                
{
    Node nNode =  nList.item(temp);    
    Element eElement = (Element) nNode;
    String upname1 = getTagValue("name", eElement);

    if(upname1.equals(nodeName))
    {
        System.out.println("Parent:   "+nNode.getParentNode().getNodeName());
        System.out.println("nodename: "+nNode.getNodeName());
        System.out.println("rmoving ....");

        rootElement.removeChild(nNode);

        System.out.println("removed..."); 
    }                   
}                   

您可以使用 DocumentTraversal、NodeIterator 删除节点。

DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse("/home/riddhish/developerworkspace/SplitString/src/com/updatexmlwithjava/file.xml");           
DocumentTraversal traversal = (DocumentTraversal) doc;
Node a = doc.getDocumentElement();
System.out.println("Current File Content");
NodeIterator iterator = traversal.createNodeIterator(a, NodeFilter.SHOW_ELEMENT, null, true);
Element b = null;
for (Node n = iterator.nextNode(); n != null; n = iterator.nextNode()) {
    Element e = (Element) n;                
    if ("parameter".equals(e.getTagName())) {
        System.out.println(""+e.getTagName() +" "+ e.getTextContent());
        b = e;
    } else if ("name".equals(e.getTagName()) && "Active Waveform Status".equals(e.getTextContent()) && b != null) {
        b.removeChild(e);
    }
}

将新内容写入文件

TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(new File("/home/riddhish/developerworkspace/SplitString/src/com/updatexmlwithjava/file.xml"));
            iterator = traversal.createNodeIterator(a, NodeFilter.SHOW_ELEMENT, null, true);
            b = null;
            doc = docBuilder.newDocument();
            Element rootElement = doc.createElement("deviceparameters");
            doc.appendChild(rootElement);
            for (Node n = iterator.nextNode(); n != null; n = iterator.nextNode()) {
                Element e = (Element) n;                 

                rootElement.appendChild(doc.importNode(n, true));

            }
            transformer.transform(source, result);