java - 从 XML 文件中删除元素 Java

Question

我有一个 xml 文件，其中包含以下内容:

<class>
<Video>Spiderman</Video>
<Video>Superman</Video>
</class>

我想根据用户输入的内容删除其中一个。到目前为止我所拥有的是

for (int x=0; x<videodatabase.size(); x++) {
            if (inputVideo.getText().contentEquals(videodatabase.get(x))) {
                try {
                    String filepath = "videodatabase.xml";
                    DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
                    DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
                    Document doc = docBuilder.parse(filepath);

                    // I want to remove the <Video>name of the video</Video> from the xml here.

                    TransformerFactory transformerFactory = TransformerFactory.newInstance();
                    Transformer transformer = transformerFactory.newTransformer();
                    DOMSource source = new DOMSource(doc);
                    StreamResult result =  new StreamResult(new File(filepath));
                    transformer.transform(source, result);
                }    
                catch(ParserConfigurationException pce){
                    pce.printStackTrace();
                }
                catch(TransformerException tfe){
                    tfe.printStackTrace();
                }
                catch(IOException ioe){
                     ioe.printStackTrace();
                }
                catch(SAXException sae){
                    sae.printStackTrace();
                }
            }
        }

正如您所看到的，程序检查输入的视频名称是否在名为 videodatabase 的数组列表中。如果是，则打开 xml 文件并准备删除输入的视频。然而我被困在这里了。我希望 xml 文件看起来像:

<class>
<Video>Spiderman</Video>
</class>

Answer 1

这是使用 XPath 时缺少的部分:

// Get a XPath instance
XPath xpath = XPathFactory.newInstance().newXPath();
// Find the Video element with text 'Superman'
Element supermanVideo = (Element) xpath.evaluate("/class/Video[. = 'Superman']", 
    doc, XPathConstants.NODE);
if(supermanVideo != null) {
  // Remove this element from the parent
  supermanVideo.getParentNode().removeChild(supermanVideo);
}
// Serialize the XML document ...