Java DOM4J 方式解析XML文件

àì夳堔傛蜴生んèń 2022-06-17 11:37 195阅读 0赞

Dom4J方式解析XML文件。dom4j是非官方提供的xml文件解析方式，因此需要去第三方下载dom4j的jar包

books.xml

<?xml version="1.0" encoding="UTF-8"?>
    <bookstore>
    	<book id="1">
    		<name>懂得生活</name>
    		<author>Mr Azzan</author>
    		<year>2017</year>
    		<price>100.00</price>
    	</book>
    	<book id="2">
    		<name>热爱生活</name>
    		<author>Miss Sun</author>
    		<year>2017</year>
    		<price>121.00</price>
    	</book>
    	<book id="3">
    		<name>品味生活</name>
    		<author>Miss Sun</author>
    		<year>2016</year>
    		<price>111.00</price>
    	</book>
    	<book id="4">
    		<name>珍惜生活</name>
    		<author>Miss Azzan</author>
    		<year>2014</year>
    		<price>110.00</price>
    	</book>
    </bookstore>

Book.java

package bookentity;
    
    /**
     * book实体
     */
    public class Book {
    	private String id;
    	private String name;
    	private String author;
    	private String year;
    	private String price;
    
    	public String getId() {
    		return id;
    	}
    
    	public void setId(String id) {
    		this.id = id;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public String getAuthor() {
    		return author;
    	}
    
    	public void setAuthor(String author) {
    		this.author = author;
    	}
    
    	public String getYear() {
    		return year;
    	}
    
    	public void setYear(String year) {
    		this.year = year;
    	}
    
    	public String getPrice() {
    		return price;
    	}
    
    	public void setPrice(String price) {
    		this.price = price;
    	}
    }

Dom4jTest.java

package Dom4jReadXMLFile;
    
    import java.io.File;
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.List;
    
    import org.dom4j.Attribute;
    import org.dom4j.Document;
    import org.dom4j.DocumentException;
    import org.dom4j.Element;
    import org.dom4j.io.SAXReader;
    import org.junit.Test;
    
    import bookentity.Book;
    
    public class Dom4jTest {
    	// 接收书籍实体的集合
    	private static ArrayList<Book> bookList = new ArrayList<Book>();
    
    	public static ArrayList<Book> getBookList() {
    		return bookList;
    	}
    
    	private void dom4jReadXMLFile() {
    		// Dom4j解析books.xml
    		// 创建的对象reader
    		SAXReader reader = new SAXReader();
    		try {
    			// 通过reader对象的read方法加载books.xml文件，获取document对象
    			Document document = reader.read(new File("books.xml"));
    			// 通过document对象获取根节点bookstore
    			Element bookstore = document.getRootElement();
    			// 通过element对象的elementIterator方法获取迭代器
    			Iterator it = bookstore.elementIterator();
    			// 全局变量记录第几本书籍
    			int num = 0;
    			// 遍历迭代器，获取根节点中的信息(书籍)
    			while (it.hasNext()) {
    				Book bookEntity = new Book();
    				num++;
    				System.out.println("====开始遍历" + num + "本书====");
    				Element book = (Element) it.next();
    				// 获取book的属性名以及属性值
    				List<Attribute> bookAttrs = book.attributes();
    				for (Attribute attr : bookAttrs) {
    					System.out.println("属性名：" + attr.getName() + "--属性值："
    							+ attr.getStringValue());
    					bookEntity.setId(attr.getStringValue());
    				}
    				// 解析子节点的信息
    				Iterator itt = book.elementIterator();
    				while (itt.hasNext()) {
    					Element bookChild = (Element) itt.next();
    					System.out.println("节点名：" + bookChild.getName() + "--节点值："
    							+ bookChild.getStringValue());
    
    					if (bookChild.getName().equals("name")) {
    						bookEntity.setName(bookChild.getStringValue());
    					}
    					if (bookChild.getName().equals("author")) {
    						bookEntity.setAuthor(bookChild.getStringValue());
    					}
    					if (bookChild.getName().equals("year")) {
    						bookEntity.setYear(bookChild.getStringValue());
    					}
    					if (bookChild.getName().equals("price")) {
    						bookEntity.setPrice(bookChild.getStringValue());
    					}
    				}
    				// 将书籍存入书籍集合中
    				bookList.add(bookEntity);
    				// 将书籍实体设置为null，节省资源
    				bookEntity = null;
    				System.out.println("====结束遍历" + num + "本书====");
    				System.out.println();//换行
    			}
    		} catch (DocumentException e) {
    			e.printStackTrace();
    		}
    
    		// 验证书籍集合中是否成功存入书籍
    		for (Book b : bookList) {
    			System.out.println("++++开始++++");
    			System.out.println(b.getId());
    			System.out.println(b.getName());
    			System.out.println(b.getAuthor());
    			System.out.println(b.getYear());
    			System.out.println(b.getPrice());
    			System.out.println("++++结束++++");
    			System.out.println();//换行
    		}
    	}
    	
    
    	@Test
    	public void test() {
    		dom4jReadXMLFile();
    	}
    
    
    }

运行结果截图：

![Center][]

[Center]: /images/20220617/b9fcfe08b2d749dc987336e9517f472c.png