import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

public class MyXPathTest {

    /**

     * @param args

     */

    public static void main(String[] args) {

        try {

            //创建解析工厂

            DocumentBuilderFactory documentBuilderFactory=DocumentBuilderFactory.newInstance();

            //创建解析器

            DocumentBuilder builder=documentBuilderFactory.newDocumentBuilder();

            //通过解析器读取文件，生成w3c.dom.Document象树

            Document document=builder.parse("conf/55.xml");

            //创建XPath对象

            XPath xPath=XPathFactory.newInstance().newXPath();

//            <Model id="057ea377-e531-422d-a181-3371b42e5bd0">

//                <Ref>

//                    <node></node>

//                    <node></node>

//                </Ref>

//                <Ref>

//                    <node></node>

//                    <node></node>

//                </Ref>

//            </Model>

            //读取Model中属性id的值

            String idPath="/Model/@id";

            String id=(String) xPath.evaluate(idPath, document, XPathConstants.STRING);

            System.out.println("id="+id);

//            <Model>

//            <Ref>

//                <node></node>

//                <node></node>

//            </Ref>

//            <Ref>

//                <node id="057ea377-e531-422d-a181-3371b42e5bd0" nodetype="DynamicMoleNode"></node>

//                <node></node>

//            </Ref>

//        </Model>

            String idNodePath="/Model/node[@nodetype='DynamicMoleNode']/@id";

            String idNode=(String) xPath.evaluate(idNodePath, document, XPathConstants.STRING);

            System.out.println("idNode="+idNode);

//            <Model>

//            <Ref>

//                <node></node>

//                <node></node>

//            </Ref>

//            <Ref>

//                <node id=" nodetype="DynamicMoleNode">

//                    <node rtf="aaaaaaaa" nodetype="Text" />

//                </node>

//                <node></node>

//            </Ref>

//        </Model>

            String rtfPath="/Model/node[@nodetype='DynamicMoleNode']/node[@nodetype='Text']/@rtf";

            String rtf=(String) xPath.evaluate(rtfPath, document, XPathConstants.STRING);

            System.out.println("rtf="+rtf);

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

}

String path="/XTextDocument/XElements/Element[@type='XTextBody']/XElements/Element";
NodeList nodeList=(NodeList) xPath.evaluate(path,document, XPathConstants.NODESET);

System.out.println("nodeList===="+nodeList.getLength());