jaxp查询结点

eg://获取name的值

// person.xml

    
        
             
      
       zhangsan
              
      
       20
          
         
             
      
       lisi
              
      
       30
          
     
    

//TestJaxp.java

package cn.xry.jaxp;import java.io.IOException;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import org.w3c.dom.Document;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;/* * 实现jaxp操作xml *  * */public class TestJaxp {    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {        //查询所有name元素的值        /*         *1.创建解析器工厂         *2.根据解析器工厂创建解析器         * 3.解析xml返回document         *          * 4.得到所有name元素         * */                 //创建解析器工厂        DocumentBuilderFactory builderFactoty = DocumentBuilderFactory.newInstance();        //创建解析器        DocumentBuilder builder = builderFactoty.newDocumentBuilder();        //解析xml返回document        Document document = builder.parse("src/person.xml");                //得到name元素        NodeList nodeLists = document.getElementsByTagName("name");        for(int i=0;i!=nodeLists.getLength();i++)        {            System.out.println(nodeLists.item(i).getTextContent());    // 注意此处链式调用        }    }}