jaxp修改节点

原xml文档：

<?xml version="1.0" encoding="UTF-8" standalone="no"?><person>
<p1>
<name>lqw</name>
<age>20</age>
<sex>nan</sex>
</p1>
<p2>
<name>pcl</name>
<age>26</age>
</p2>
</person>

要求：将xml的p1标签里的sex改成nv

思路：

1.创建解析器工厂：DocumentBuilderFactory；

2.通过解析器工厂创建解析器：DocumentBuilder；

3.解析xml返回Document：parse方法；

4.得到所有sex标签：getElementsByTagName("sex");

5.通过item方法得到第一个sex标签

6.使用setTextContent方法将nan改为nv

7.回写

代码：

package cn.itcast.jasptest;

import java.io.IOException;

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

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.SAXException;

public class Test {
    //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
     */
    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException,TransformerException {
        modifySex();
    }
    public static void modifySex() throws ParserConfigurationException, SAXException, IOException, TransformerException {
        DocumentBuilderFactory builderFactory=DocumentBuilderFactory.newInstance();
        DocumentBuilder builder=builderFactory.newDocumentBuilder();
        Document document=builder.parse("src/1.xml");
        NodeList list=document.getElementsByTagName("sex");
        Node sex1=list.item(0);
        sex1.setTextContent("nan");
        TransformerFactory transformerFactory=TransformerFactory.newInstance();
        Transformer transformer=transformerFactory.newTransformer();
        transformer.transform(new DOMSource(document),new StreamResult("src/1.xml"));
    }
    

}