<dependency>
    <groupId>org.dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>2.1.1</version>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>

<persons>
  <person id="007">
    <name>张三</name>
    <sex>男</sex>
    <age>18</age>
  </person>
</persons>

package com.example;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.IOException;

public class Xxx {

    public static void main(String[] args) {
        // 创建SAXParser解析工厂对象
        SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
        try {
            // 创建解析器
            SAXParser saxParser = saxParserFactory.newSAXParser();
            // 执行parse方法
            saxParser.parse("D:/_temp/person.xml", new MyDefaultHandle());
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}


/**
 * 自定义类继承DefaultHandle类
 */
class MyDefaultHandle extends DefaultHandler {
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        System.out.print("<" + qName + ">");
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        System.out.print(new String(ch, start, length));
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        System.out.print("</" + qName + ">");
    }
}

<persons>
  <person>
    <name>张三</name>
    <sex>男</sex>
    <age>18</age>
  </person>
</persons>