code: public static List<Element> getEles(Element ele, String xpath) {
          XPathFactory factory = XPathFactory.newInstance();
          XPath xp = factory.newXPath();
          try {
              XPathExpression expression = xp.compile(xpath);
              NodeList nodes = (NodeList) expression.evaluate(ele, XPathConstants.NODESET);
              List<Element> list = new ArrayList<Element>();
              int len = nodes.getLength();
              for (int i = 0; i < len; i++) {
                  Node node = nodes.item(i);
                  if (node instanceof Element) {
                      list.add((Element)node);
                  }
              }
              return list;
          }
          catch (XPathExpressionException e) {
              throw Lang.wrapThrow(e);
          }
      }
docs: 从一个 XML 元素开始，根据一条 XPath 获取一组元素
  
  @param ele
  XML 元素
  @param xpath
  要获取的元素的 XPath
  @return 元素列表