xml解析-jaxp查询结点

Posted 2022-02-14 selfdef

jaxp查询结点

eg://获取name的值

// person.xml

<?xml version="1.0" encoding="UTF-8"?>
<person>
    <p1>
        <name>zhangsan</name>
        <age>20</age>
    </p1>
    <p1>
        <name>lisi</name>
        <age>30</age>
    </p1>
</person>

//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