1.加载dom4j依赖：

<!-- https://mvnrepository.com/artifact/org.dom4j/dom4j -->
<dependency>
    <groupId>org.dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>2.1.3</version>
</dependency>

2.解析xml文件：

package com.example.demo;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

public class Dom4jTest {
    public static void main(String[] args) throws DocumentException {
        SAXReader saxReader = new SAXReader();
//        Document document = saxReader.read("src/main/resources/log.xml");
        Document document = saxReader.read(Dom4jTest.class.getClassLoader().getResourceAsStream("log.xml"));
        System.out.println(document);
        // 获取根元素
        Element rootElement = document.getRootElement();
        System.out.println(rootElement.getName());
        // element(String name) elements() elements(String name)
        List<Element> books = rootElement.elements("book");
        List<Book> bookList = new ArrayList<>();
        for (Element book : books) {
            // asXml()将标签对象转换为标签字符串
            Element nameElement = book.element("name");
            String name = nameElement.getText();
            // elementText(String tagName)直接获取指定标签名的文本内容
            String price = book.elementText("price");
            String author = book.elementText("author");
            String sn = book.attributeValue("sn");
            bookList.add(new Book(name, BigDecimal.valueOf(Double.parseDouble(price)),author,sn));
        }
        System.out.println(bookList);
    }
}