在xml中传递变量并读出

<variable name="myVariable">Hello, World!</variable>

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;

public class XMLVariableReader {
    public static void main(String[] args) {
        try {
            // 加载XML文件
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse("path/to/xml/file.xml");

            // 创建XPath对象
            XPathFactory xPathFactory = XPathFactory.newInstance();
            XPath xpath = xPathFactory.newXPath();

            // 编译XPath表达式
            XPathExpression expr = xpath.compile("//variable[@name='myVariable']");

            // 执行XPath表达式并获取结果
            NodeList nodes = (NodeList) expr.evaluate(document, XPathConstants.NODESET);
            if (nodes.getLength() > 0) {
                Node variableNode = nodes.item(0);
                String variableValue = variableNode.getTextContent();
                System.out.println("Variable value: " + variableValue);
            } else {
                System.out.println("Variable not found.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}