Java HTML/XML - 如何使用XPath通过名称计数某个标记

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathFactory;

import org.xml.sax.InputSource;

public class Main {

  public static void main(String[] args) throws Exception {
    InputSource inputSource = new InputSource("input.xml");
    XPath xPath = XPathFactory.newInstance().newXPath();
    String text = xPath.evaluate("/note/body", inputSource);
    System.out.println(text);
  }

}