DOM4J解析.XML文件

<?xml version="1.0" encoding="utf-8" ?>
<books><book id="SN123123413241"><name>java编程思想</name><author>华仔</author><price>9.9</price></book><book id="SN12341235123"><name>葵花宝典</name><author>班长</author><price>5.5</price></book>
</books>

 实体类

package com;import java.math.BigDecimal;
import java.util.Objects;/*** @author hrui* @date 2023/10/20 16:39*/
public class Book {private String sn;private String name;private BigDecimal price;private String author;public Book() {}public Book(String sn, String name, BigDecimal price, String author) {this.sn = sn;this.name = name;this.price = price;this.author = author;}@Overridepublic String toString() {return "Book{" +"sn='" + sn + '\'' +", name='" + name + '\'' +", price=" + price +", author='" + author + '\'' +'}';}@Overridepublic boolean equals(Object o) {if (this == o) return true;if (o == null || getClass() != o.getClass()) return false;Book book = (Book) o;return Objects.equals(sn, book.sn) && Objects.equals(name, book.name) && Objects.equals(price, book.price) && Objects.equals(author, book.author);}@Overridepublic int hashCode() {return Objects.hash(sn, name, price, author);}public String getSn() {return sn;}public void setSn(String sn) {this.sn = sn;}public String getName() {return name;}public void setName(String name) {this.name = name;}public BigDecimal getPrice() {return price;}public void setPrice(BigDecimal price) {this.price = price;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}
}

package com;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.junit.Test;import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;/*** @author hrui* @date 2023/10/20 16:42*/
public class Dom4jTest {@Testpublic void test01(){//创建一个SaxReader输入流,去读取xl配置文件,生成Document对象SAXReader saxReader=new SAXReader();Document document= null;try {document = saxReader.read("src/books.xml");} catch ( Exception e) {e.printStackTrace();}System.out.println(document);}//读取books.xml文件生成Book类@Testpublic void test02() throws DocumentException {String projectRoot = System.getProperty("user.dir");System.out.println(projectRoot);//1.读取books.xml文件SAXReader saxReader=new SAXReader();Document document = saxReader.read("src/books.xml");//2.通过Document对象获取根元素Element rootElement = document.getRootElement();//3.通过根元素获取book标签对象List<Element> books = rootElement.elements("book");List<Book> bookList=new ArrayList<>();//4.遍历处理每个book标签转换为Book类for(Element e:books){//asXML()把标签对象转为标签字符串// System.out.println(e.asXML());Element name = e.element("name");//System.out.println(name.asXML());//getText()获取标签文本内容String nameText=name.getText();//elementText直接获取指定标签里的文本内容String priceText=e.elementText("price");String authorText=e.elementText("author");String sn=e.attributeValue("id");System.out.println(sn);Book book=new Book();book.setSn(sn);book.setAuthor(authorText);book.setName(nameText);book.setPrice(new BigDecimal(priceText));bookList.add(book);}System.out.println(bookList);}public static void main(String[] args) throws DocumentException {String projectRoot = System.getProperty("user.dir");System.out.println(projectRoot);//1.读取books.xml文件SAXReader saxReader=new SAXReader();Document document = saxReader.read("src/books.xml");//2.通过Document对象获取根元素Element rootElement = document.getRootElement();//3.通过根元素获取book标签对象List<Element> books = rootElement.elements("book");List<Book> bookList=new ArrayList<>();//4.遍历处理每个book标签转换为Book类for(Element e:books){//asXML()把标签对象转为标签字符串// System.out.println(e.asXML());Element name = e.element("name");//System.out.println(name.asXML());//getText()获取标签文本内容String nameText=name.getText();//elementText直接获取指定标签里的文本内容String priceText=e.elementText("price");String authorText=e.elementText("author");String sn=e.attributeValue("id");System.out.println(sn);Book book=new Book();book.setSn(sn);book.setAuthor(authorText);book.setName(nameText);book.setPrice(new BigDecimal(priceText));bookList.add(book);}System.out.println(bookList);}
}

上面@Test可以执行,main方法找不到文件的原因

这是因为在测试中，测试运行器可能会设置不同的当前工作目录（working directory）。