java 用dom4j解析xml文件中的制定标签节点下的内容

Question

如下图所示，P-PORT-PROTOTYPE 为xml文件中的节点，在任意位置，

用dom4j去解析该xml文件，如何直接定位到此节点，获取到xml文件中有多少个P-PORT-PROTOTYPE节点，然后ORT-PROTOTYPE下的SHORT-NAME的值

Answer 1

 private static String  xmlStr = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
            "<root>\n" +
            "\t<root1>\n" +
            "\t\t<name>\n" +
            "\t\t\t<P-PORT-PROTOTYPE>\n" +
            "\t\t\t\t <SHORT-NAME>NAME1</SHORT-NAME>\n" +
            "\t\t\t\t <PROVIDED-INTERFACE-TREF>TREF1</PROVIDED-INTERFACE-TREF>\n" +
            "\t\t\t</P-PORT-PROTOTYPE>\n" +
            "\t\t</name>\n" +
            "\t\t<ports>\n" +
            "\t\t\t<P-PORT-PROTOTYPE>\n" +
            "\t\t\t\t <SHORT-NAME>NAME1</SHORT-NAME>\n" +
            "\t\t\t\t <PROVIDED-INTERFACE-TREF>TREF1</PROVIDED-INTERFACE-TREF>\n" +
            "\t\t\t</P-PORT-PROTOTYPE>\n" +
            "\t\t\t<P-PORT-PROTOTYPE>\n" +
            "\t\t\t\t<SHORT-NAME>NAME2</SHORT-NAME>\n" +
            "\t\t\t\t<PROVIDED-INTERFACE-TREF>TREF2</PROVIDED-INTERFACE-TREF>\n" +
            "\t\t\t</P-PORT-PROTOTYPE>\n" +
            "\t\t\t<P-PORT-PROTOTYPE>\n" +
            "\t\t\t\t<SHORT-NAME>NAME3</SHORT-NAME>\n" +
            "\t\t\t\t<PROVIDED-INTERFACE-TREF>TREF3</PROVIDED-INTERFACE-TREF>\n" +
            "\t\t\t</P-PORT-PROTOTYPE>\n" +
            "\t\t\t<P-PORT-PROTOTYPE>\n" +
            "\t\t\t\t<SHORT-NAME>NAME4</SHORT-NAME>\n" +
            "\t\t\t\t<PROVIDED-INTERFACE-TREF>TREF4</PROVIDED-INTERFACE-TREF>\n" +
            "\t\t\t</P-PORT-PROTOTYPE>\n" +
            "\t\t</ports>\n" +
            "\t</root1>\n" +
            "</root>";

    public static void main(String[] args) throws Exception{
        //将xml字符串转为Document对象
        Document document = DocumentHelper.parseText(xmlStr);
        //获取根节点 root节点
        Element rootElement = document.getRootElement();
        Map<String,Element> map = new HashMap<String,Element>();
        List<String> list = new ArrayList<String>();
        getE("P-PORT-PROTOTYPE",rootElement,map);
        System.out.println("匹配上"+map.size()+"个P-PORT-PROTOTYPE节点信息");
        for (String s : map.keySet()){
            System.out.println(s + "节点路径下的信息如下：");
            List<Element> elements = map.get(s).getParent().elements("P-PORT-PROTOTYPE");
            System.out.println("P-PORT-PROTOTYPE节点个数为："+elements.size());
            for(Element e : elements){
                for(Element e1 : e.elements()){
                    System.out.println(e1.getName() + "========" + e1.getTextTrim());
                }
            }
        }

    }

    /**
     * 匹配指定元素
     * @param EName 目标元素
     * @param element 根元素
     * @param map 存放匹配上的元素集合
     */
    public static void getE(String EName, Element element, Map<String,Element> map){
       if(element.hasMixedContent() && !element.getName().equals(EName)){
           List<Element> elements = element.elements();
           for(Element e : elements){
               getE(EName,e,map);
           }
       }else if (element.getName().equals(EName)){
           map.put(element.getPath(),element);
       }
    }