How to insert values into an XML page using Java?

To add values to an XML page, you can use APIs like DOM (Document Object Model) or JDOM (Java XML processing library) to manipulate the XML file. Below is an example code of using DOM method to add values to an XML page:

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;

public class AddValueToXML {
    public static void main(String[] args) {
        try {
            File xmlFile = new File("example.xml");
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            Document document = documentBuilder.parse(xmlFile);

            Element root = document.getDocumentElement();

            // 创建新的元素并设置值
            Element newElement = document.createElement("newElement");
            newElement.appendChild(document.createTextNode("New Value"));

            // 将新元素添加到根元素中
            root.appendChild(newElement);

            // 将修改后的XML写回文件
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(document);
            StreamResult result = new StreamResult(xmlFile);
            transformer.transform(source, result);

            System.out.println("Value added successfully to XML file");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

In this example, we start by loading an XML file, then create a new element and set its value. Next, we add the new element to the root element, and finally write the modified XML file back to the original file.

This way, we can easily add new values to XML pages. You can also use other APIs for XML processing as needed.