xml(可扩展的标记语言)和Dom4J

CDATA格式

不会被xml解析

<![CDATA[
    
    ]]>

Dom4j解析

1. 新建Java工程，创建lib文件夹，将dom4j包添加
   https://wwa.lanzous.com/iSdbAowne4h
   解压-选择dom4j.jar文件放到lib文件夹下

2. 导入jar包
   File-project structure
   

3. 在src下创建book.xml

<?xml version="1.0" encoding="UTF-8"?>
<books>
    <book sn="SN12341232">
        <name>辟邪剑谱</name>
        <price>9.9</price>
        <author>班主任</author>
    </book>
    <book sn="SN12341231">
        <name>葵花宝典</name>
        <price>99.99</price>
        <author>班长</author>
    </book>
</books>

4. 在src下新建一个包，在包下创建一个Book类

package com.ningqian.xml;

import java.math.BigDecimal;

/**
 * @author ningqian
 * @create -05-07 21:47
 */
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;
    }

    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;
    }

    @Override
    public String toString() {
        return "Book{" +
                "sn='" + sn + '\'' +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", author='" + author + '\'' +
                '}';
    }
}

5. 创建一个Dom4jTest的测试类，并创建测试方法

public class Dom4jTest {
    @Test
    public void testDom4j() throws DocumentException {
        SAXReader saxReader = new SAXReader();
        //读取xml文件
        Document document = saxReader.read("src/book.xml");
        //通过Document对象获取根元素
        Element rootElement = document.getRootElement();
        //通过根元素获取book标签对象
        List<Element> books = rootElement.elements("book");
        for(Element book:books){
            //asXML()：将标签对象转成标签字符串
            //System.out.println(book.asXML());
            Element bookName = book.element("name");
            //getText()可以获取标签内的文本内容
            String bookNameText = bookName.getText();
            //elementText()直接获取标签的内容
            String bookPriceText = book.elementText("price");
            String bookAuthorText = book.elementText("author");
            String bookSn = book.attributeValue("sn");
            System.out.println(new Book(bookSn,bookNameText,new BigDecimal(bookPriceText),bookAuthorText));
        }

    }
}

6. 测试结果