标签：style end 文件解析 bre efault ase attr ring 硬盘
// 书籍列表private List<Book> bookList = new LinkedList<Book>();/*** 根据xml文件，得到书籍列表** @param file* @return*/public List<Book> getBookList(String file) {parseXML(file);return bookList;}
/*** 获取DocumentBuilder对象*@return*/private DocumentBuilder getDocumentBuilder() {DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = null;try {builder = factory.newDocumentBuilder();} catch (ParserConfigurationException e) {// TODO Auto-generated catch blocke.printStackTrace();}return builder;}
/*** 读取XML，并将book对象存入书籍列表** @param file*/private void parseXML(String file) {// 1.临时书籍变量Book book;try {// 2.获取DocumentBuilder对象DocumentBuilder documentBuilder = getDocumentBuilder();// 3.加载XML文件到当前项目下，获取Document‘文档’对象Document document = documentBuilder.parse(file);// 4.获取节点名称是book的集合NodeList books = document.getElementsByTagName("book");// 5.遍历book节点集合for (int i = 0; i < books.getLength(); i++) {// 重置book变量book = new Book();// 5.1声明book节点变量Node bookNode = books.item(i);// 5.2获取book节点的属性集合NamedNodeMap nodeMap = bookNode.getAttributes();// 5.3遍历属性集合，判断并为book对象的属性赋值for (int j = 0; j < nodeMap.getLength(); j++) {// 5.4声明book的属性Node attrNode = nodeMap.item(j);// 5.5如果属性Name为idif (attrNode.getNodeName().equals("id")) {book.setId(Integer.valueOf(attrNode.getNodeValue()));}}// 5.6获取book节点的子节点NodeList childList = bookNode.getChildNodes();// 5.7遍历子节点for (int j = 0; j < childList.getLength(); j++) {// 5.8 声明book子节点Node child = childList.item(j);// 判断是否是节点。NodeType有三种：// Element(节点)：1，Attribute(属性)：2，#Text(文本)：3。if (Node.ELEMENT_NODE == child.getNodeType()) {// 5.9使用switch case判断，并为book对象属性赋值switch (child.getNodeName()) {case "title":book.setTitle(child.getTextContent());break;case "author":book.setAuthor(child.getTextContent());break;case "price":book.setPrice(Double.valueOf(child.getTextContent()));break;case "year":book.setYear(child.getTextContent());break;case "language":book.setLanguage(child.getTextContent());break;default:System.out.println("未知属性！");}}}// 6 将book对象放入集合bookList.add(book);}} catch (SAXException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
/*** 生成XML文件，写入book列表** @param file*/private void createXML(List<Book> bookList, String file, String encoding) {DocumentBuilder builder = getDocumentBuilder();//创建document文件Document document = builder.newDocument();// 在document中，创建根节点Element eBookstore = document.createElement("bookstore");for (Book book : bookList) {// 创建book节点Element eBook = document.createElement("book");// 为book节点添加id属性eBook.setAttribute("id", String.valueOf(book.getId()));// 创建book的子节点Element eTitle = document.createElement("title");// 创建CDATA元素CDATASection titleByCDATA = document.createCDATASection(book.getTitle());// 将CDATA元素加入titleeTitle.appendChild(titleByCDATA);eTitle.setTextContent(book.getTitle());Element eAuthor = document.createElement("author");eAuthor.setTextContent(book.getAuthor());Element eYear = document.createElement("year");eYear.setTextContent(book.getYear());Element ePrice = document.createElement("price");ePrice.setTextContent(String.valueOf(book.getPrice()));Element eLanguage = document.createElement("language");eLanguage.setTextContent(book.getLanguage());// 将子节点添加到book中eBook.appendChild(eTitle);eBook.appendChild(eAuthor);eBook.appendChild(eYear);eBook.appendChild(ePrice);eBook.appendChild(eLanguage);// 将book节点添加到bookstore根节点中eBookstore.appendChild(eBook);}// 将bookstore节点添加到document中，目前文件只存在与内存中document.appendChild(eBookstore);// 创建TransformerFactory 对象Transformer former = getTransformer(encoding);try {// 创建输出流OutputStream output = new FileOutputStream(file);// 输出XML文件到硬盘former.transform(new DOMSource(document), new StreamResult(output));} catch (TransformerConfigurationException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (TransformerException e) {// TODO Auto-generated catch blocke.printStackTrace();}}
/*** 获取Tranformer对象** @param encoding* 指定编码* @return Tranformer*/private Transformer getTransformer(String encoding) {// 创建TransformerFactory 对象TransformerFactory factory = TransformerFactory.newInstance();Transformer former = null;try {former = factory.newTransformer();// 换行former.setOutputProperty(OutputKeys.INDENT, "yes");// 指定编码former.setOutputProperty(OutputKeys.ENCODING, encoding);} catch (TransformerConfigurationException e) {// TODO Auto-generated catch blocke.printStackTrace();}return former;}
标签：style end 文件解析 bre efault ase attr ring 硬盘
原文地址：http://www.cnblogs.com/Maple-leaves/p/6255490.html
