<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<person>

    <p1>

        <name>jobs</name>

        <age>56</age>

        <sex>female</sex>

    </p1>

    <p1>

        <name>Alis</name>

        <age>32</age>

    </p1>

</person>

package jaxp;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.transform.Transformer;

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;

public class TestJaxp {

    public static void main(String[] args) {

        try {

            modifySex();

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    public static void modifySex() throws Exception{

        //创建解析器工厂

        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

        //创建解析器

        DocumentBuilder builder = builderFactory.newDocumentBuilder();

        //解析xml返回document

        Document document = document = builder.parse("src/person.xml");

        // 得到sex

        Node sex = document.getElementsByTagName("sex").item(0);

        //修改sex内容

        sex.setTextContent("male");

        // 回写xml

        TransformerFactory transformerFactory = TransformerFactory.newInstance();

        Transformer transformer = transformerFactory.newTransformer();

        transformer.transform(new DOMSource(document), new StreamResult("src/person.xml"));

    }

}

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<person>

    <p1>

        <name>jobs</name>

        <age>56</age>

        <sex>male</sex>

    </p1>

    <p1>

        <name>Alis</name>

        <age>32</age>

    </p1>

</person>