JAVA 使用java解析XML文件

如何在这里面提取到"JAVA NB" 这个值

<?xml version="1.0" encoding="utf-8"?><string xmlns="http://tempuri.org/">JAVA NB</string> 

各位大佬，小菜鸟在这里拜谢了！！！

没看懂问题.............

package com.cxx.xml;

import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
/**
 * @Author: cxx
 * Dom操作xml
 * @Date: 2018/5/29 20:19
 */
public class DomDemo {
    //用Element方式
    public static void element(NodeList list){
        for (int i = 0; i <list.getLength() ; i++) {
            Element element = (Element) list.item(i);
            NodeList childNodes = element.getChildNodes();
            for (int j = 0; j <childNodes.getLength() ; j++) {
                if (childNodes.item(j).getNodeType()==Node.ELEMENT_NODE) {
                    //获取节点
                    System.out.print(childNodes.item(j).getNodeName() + ":");
                    //获取节点值
                    System.out.println(childNodes.item(j).getFirstChild().getNodeValue());
                    // 获取java NB
                    if(childNodes.item(j).getFirstChild().getNodeValue().equals("java NB")){
                      System.out.print("恭喜你获取到了java NB");
                 }
                }
            }
        }
    }

    public static void node(NodeList list){
        for (int i = 0; i <list.getLength() ; i++) {
            Node node = list.item(i);
            NodeList childNodes = node.getChildNodes();
            for (int j = 0; j <childNodes.getLength() ; j++) {
                if (childNodes.item(j).getNodeType()==Node.ELEMENT_NODE) {
                    System.out.print(childNodes.item(j).getNodeName() + ":");
                    System.out.println(childNodes.item(j).getFirstChild().getNodeValue());
                }
            }
        }
    }

    public static void main(String[] args) {
        //1.创建DocumentBuilderFactory对象
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        //2.创建DocumentBuilder对象
        try {
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document d = builder.parse("src/main/resources/demo.xml");
            NodeList sList = d.getElementsByTagName("student");
            //element(sList);
            node(sList);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

String xmlDoc=“.xml文件”
//1.把xml文件加载进来
Document doc = DocumentHelper.parseText(xmlDoc);
//2.获取根节点的对象
Element root =doc.getRootElement();
//3.获取一级节点
Element body = root.element("一级节点的对象名");
//4.获取二级节点
Element vehispara = body.element("二级节点的对象名");
//5.最终需要取出的字段
String bdlx =vehispara.element("Java NB").getTextTrim();