我必须根据用户ID从XML文件中删除重复条目，使用Java中的DOM解析器

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();

Document document = builder.parse(new File("your_xml_file.xml"));

String userId = "your_user_id";
NodeList nodeList = document.getElementsByTagName("item");
for (int i = 0; i < nodeList.getLength(); i++) {
    Element item = (Element) nodeList.item(i);
    String id = item.getAttribute("id");
    if (id.equals(userId)) {
        item.getParentNode().removeChild(item);
    }
}

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.transform(new DOMSource(document), new StreamResult(new File("your_modified_xml_file.xml")));