DOM方式解析xml实例2

老样子，javabean实体类： 

import java.io.*;
public class Book implements Serializable {   
    private int id;   
    private String name;   
    private double price;  
    
    public Book(){}
    public Book(int id,String name,double price){
      this.id=id;
      this.name=name;
      this.price=price;
    }
    public void setId(int id){
       this.id=id;
    }
    public void setName(String name){
      this.name=name;
    }
    public void setPrice(double price){
      this.price=price;
    }
}

主要看这里： 

public class DomParseService {
public List<Book> getBooks(InputStream inputStream)
	throws ParserConfigurationException, SAXException, IOException {
	List<Book> bookList = new ArrayList<Book>();
	DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
	DocumentBuilder builder = factory.newDocumentBuilder();
	Document document = builder.parse(inputStream);
	Element documentElement = document.getDocumentElement();
	System.out.println("<?xml version="1.0" encoding="UTF-8"?>");
	// 递归解析xml并进行原样输出
	parseAll(documentElement);
	System.out.println("
");
	// System.out.println(documentElement.getChildNodes().getLength());
	NodeList bookNodeList = document.getElementsByTagName("book");
	for (int i = 0; i < bookNodeList.getLength(); i++) {
		Element element = (Element) bookNodeList.item(i);
		// System.out.println(element.getChildNodes().getLength());
		// System.out.println(node.getNodeType()+":"+node.getNodeName()+":"+node.getNodeValue());
		Book book = new Book();
		book.setId(Integer.valueOf(element.getAttribute("id")));
		NodeList bookChildNodes = element.getChildNodes();
		for (int j = 0; j < bookChildNodes.getLength(); j++) {
        	Node node = bookChildNodes.item(j);
			if (node.getNodeType() == Node.ELEMENT_NODE) {
		      Element bookChildNode = (Element) node;
		if ("name".equals(bookChildNode.getNodeName())) {
			book.setName(bookChildNode.getFirstChild()
				.getNodeValue());
		} else if ("price".equals(bookChildNode.getNodeName())) {
				book.setPrice(Double.valueOf(bookChildNode
					.getFirstChild().getNodeValue()));
		}
	}
 }
	bookList.add(book);
}
	// NodeList nodeList=documentElement.getChildNodes();
	// for(int j=0;j<nodeList.getLength();j++){
	// Node node=nodeList.item(j);
	// System.out.println(node.getNodeType()+":"+node.getNodeName()+":"+node.getNodeValue());
	// }
	return bookList;
}

public void parseAll(Element element) {
	String tagName = element.getNodeName();
	System.out.print("<" + tagName);
	NamedNodeMap attrMap = element.getAttributes();
	if (attrMap != null && attrMap.getLength() > 0) {
		for (int i = 0; i < attrMap.getLength(); i++) {
			Attr attr = (Attr) attrMap.item(i);
			String attrName = attr.getNodeName();
			String attrValue = attr.getNodeValue();
			System.out.print(" " + attrName + "="" + attrValue + """);
		}
	}
	System.out.print(">");
	NodeList childNodeList = element.getChildNodes();
	if (childNodeList != null && childNodeList.getLength() > 0) {
		for (int j = 0; j < childNodeList.getLength(); j++) {
			Node childNode = childNodeList.item(j);
			if (childNode.getNodeType() == Node.ELEMENT_NODE) {
				// 递归解析xml
				parseAll((Element) childNode);
			} else if (childNode.getNodeType() == Node.COMMENT_NODE) {
				System.out.print("<!--" + childNode.getNodeValue() + "-->");
			} else if (childNode.getNodeType() == Node.TEXT_NODE) {
				System.out.print(childNode.getNodeValue());
			}
		}
	}
	System.out.print("</" + tagName + ">");
	}
}
                          

JUnit测试： 

@Test
	public void test() throws ParserConfigurationException, SAXException, IOException {
		InputStream inputStream=this.getClass().getClassLoader().getResourceAsStream("xml.xml");
		DomParseService dps=new DomParseService();
		List<Book> bookList=dps.getBooks(inputStream);
		for(Book book:bookList){
			System.out.println(book);
		}
	}
                          

结果输出如下： 

<?xml version="1.0" encoding="UTF-8"?>
<books>
	<book id="12">
		<name>thinking in java</name>
		<price>85.5</price>
	</book>
	<book id="15">
		<name>Spring in Action</name>
		<price>39.0</price>
	</book>
</books>
12:thinking in java:85.5
15:Spring in Action:39.0