采用DOM方式解析xml
老样子，javabean实体类：
public class Book implements Serializable {private int id;private String name;private double price;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("\n");// 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xmlparseAll((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 + ">");}}@Testpublic 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);}}<?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:85.515:Spring in Action:39.0