JDom2的Xpath使用

     /**
      * XPath获取属性值
      * @param root
      * @param xPath
      * @return
      */
     public static String getXPathAttributeValue(Element root, String xPath){
         XPathExpression<Attribute> pp = XPathFactory.instance().compile(xPath,Filters.attribute());
         return pp.evaluateFirst(root).getValue();
     }

     /**
      * XPath获取节点值
      * @param root 主节点
      * @param xPath XPath字符串
      * @return 没有找到返回null
      */
     public static String getXPathText(Element root, String xPath){
         XPathExpression<Text> pp = XPathFactory.instance().compile(xPath,Filters.text());
         return pp.evaluateFirst(root).getText();
     }

     /**
      * XPath获取节点
      * @param root 主节点
      * @param xPath XPath字符串
      * @return 没有找到返回null
      */
     public static Element getXPathNode(Element root, String xPath){
         XPathExpression<Element> pp = XPathFactory.instance().compile(xPath,Filters.element());
         return pp.evaluateFirst(root);
     }

     /**
      * XPath获取节点集合
      * @param root 主节点
      * @param xPath XPath字符串
      * @return XPath得到的节点集合
      */
     public static List<Element> getXPathNodes(Element root, String xPath){
         XPathExpression<Element> pp = XPathFactory.instance().compile(xPath,Filters.element());
         return pp.evaluate(root);
     }

JDom2的Xpath的获取关键在XPathExpression、XPathFactory身上.