使用 java 删除 XML 根的子级 [英] Remove a child of root of XML using java

问题描述

这是我的 xml 文件.

This is my xml file.

- <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Active wavwform Status"的节点.如何从 xml 中删除该特定节点.

I want to remove node with name 'Active wavwform Status'. How can I reomve that particular node from xml.

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..."); 
    }                   
}                   

推荐答案

我得到了答案.
实际上我是从我的 xml 文件中删除节点，但我没有将它写入我的 xml 文件.
我错过了以下部分

I got the answer.
Actually I was deleting the node from my xml file, but I was not writing it to my xml file.
I was missing following part

TransformerFactory transformerFactory = TransformerFactory.newInstance();  
Transformer transformer = transformerFactory.newTransformer();   
DOMSource source = new DOMSource(doc);   
StreamResult result = new StreamResult(selectedFile); 
transformer.transform(source, result); 

经过长时间的代码研究，我发现了这个愚蠢的错误，所以我更正了.
无论如何感谢您的回复.

After long time study of code I found this silly mistake, so I corrected it.
Anyways thanks for your reply.

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