DOM解析器的设计与实现.docx

实验三:DOM解析器的设计与实现 学时：2 目的： 了解DOM模型的原理 掌握DOM模型的应用 内容： 采用Eclipse IDE (或MyEclipse)建立一个XML项目 编写相应的Java类 利用JAXP完成一个DOM解析器的开发 1. 使用dom创建实验一完成的xml 代码: import javax.xml.transform.*;import javax.xml.transform.stream.*;import javax.xml.transform.dom.*;import org.w3c.dom.*;import org.w3c.dom.bootstrap.DOMImplementationRegistry;import org.w3c.dom.ls.DOMImplementationLS;import org.w3c.dom.ls.LSOutput;import org.w3c.dom.ls.LSSerializer;import javax.xml.parsers.*;import java.io.*;public class JAXPFirstLab public static void main(String args) String book_name = Struts 2.1权威指南,轻量级Java EE企业开发实战;String book_author = 李刚,李刚;double book_price = 79.00,89;String book_desc = 该书详细介绍了Struts 2.1的用法,该书主要介绍了一种流行的轻量级企业应用架构;DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();try DocumentBuilder domParse = factory.newDocumentBuilder();Document document = domParse.newDocument();document.setXmlVersion(1.0);Element root = document.createElement(books);document.appendChild(root);for (int i = 1; i = book_name.length; i+) Node node = document.createElement(ITBook);root.appendChild(node);NodeList nodeList = document.getElementsByTagName(ITBook);int size = nodeList.getLength();for (int i = 0; i size; i+) Node node = nodeList.item(i);if(node.getNodeType() = Node.ELEMENT_NODE)Element elementNode = (Element)node;Node nodeName = document.createElement(book_name);Node nodeAuthor = document.createElement(book_author);Node nodePrice = document.createElement(book_price);Node nodeDesc = document.createElement(book_desc);nodeName.appendChild(document.createTextNode(book_namei);nodeAuthor.appendChild(document.createTextNode(book_authori);nodePrice.appendChild(document.createTextNode(book_pricei+);nodeDesc.appendChild(document.createTextNode(book_desci);elementNode.appendChild(nodeName);elementNode.appendChild(nodeAuthor);elementNode.appendChild(nodePrice);elementNode.appendChild(nodeDesc);DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();DOMImplementationLS domImplLs = (DOMImplementationLS)registry.getDOMImplementation(LS);LSSerializer serializer = domImplLs.createLSSerializer();serializer.getDomConfig().setParameter(format-pretty-print, true);LSOutput out = domImplLs.createLSOutput();out.setEncoding(GB2312);FileWriter stringOut = new FileWriter(books_new.xml);out.setCharacterStream(stringOut);serializer.write(document, out); catch (Exception e) / TODO Auto-generated catch blocke.printStackTrace();实验截图 2.使用dom删除xml其中一条（特定条件）的信息删除书名为Struts 2.1权威指南的这条书的全部记录public static void delete()try DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();factory.setIgnoringElementContentWhitespace(true);DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse(books_new.xml);/先找到要删除的节点NodeList authors = document.getElementsByTagName(book_name);/通过这个节点找到他的父亲节点，再通过父亲节点删除当前节点for (int i = 0; i authors.getLength(); i+) Node node = authors.item(i);System.out.println(node.getTextContent();if(node.getTextContent().equals(Struts 2.1权威指南)Node book = node.getParentNode();book.getParentNode().removeChild(book);DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();DOMImplementationLS domImplLs = (DOMImplementationLS)registry.getDOMImplementation(LS);LSSerializer serializer = domImplLs.createLSSerializer();serializer.getDomConfig().setParameter(format-pretty-print, true);LSOutput out = domImplLs.createLSOutput();out.setEncoding(GB23