Dom解析xml 璃月

DomParseTest.java

package cn.pinnsvin;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

//Dom解析Xml
public class DomParseTest {
    
    @Test
    public void domParse() throws Exception{
        //获取DocumentBuilderFactory
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
        //获取DocumentBuilder
        DocumentBuilder documentBuilder = builderFactory.newDocumentBuilder();
        //通过documentBuilder解析xml文档获得Document对象
        Document document = documentBuilder.parse("book.xml");
        //通过元素的名字可以找到元素的集合
        NodeList nodeList = document.getElementsByTagName("书名");
        //找到第二个元素
        Node node = nodeList.item(1);
        //读出对应节点的文本内容
        String content = node.getTextContent();
        System.out.println(content);
    }
    
    @Test
    public void domModifyxml() throws ParserConfigurationException, SAXException, IOException, TransformerException{
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
        Document document = documentBuilder.parse("book.xml");
        NodeList nodeList = document.getElementsByTagName("价格");
        Node node = nodeList.item(1);
        node.setTextContent("99.00");
        
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        
        Source source = new DOMSource(document);
        Result result = new StreamResult("book.xml");
        transformer.transform(source, result);
    }
}

book.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?><书架>
    <书>
        <书名>java深入浅出</书名>
        <作者>你猜 </作者>
        <价格>20.50</价格>
    </书>
    <书>
        <书名>c深入浅出</书名>
        <作者>haha </作者>
        <价格>99.00</价格>
    </书>
</书架>