java DOMParser 解析xml的实例详解

import java.io.*;  import java.net.*;  import org.w3c.dom.*;  import org.w3c.dom.Node.*;     import oracle.xml.parser.v2.*;     /**   * -----------------------------------------------------------------------------   * Demonstrate how to use DOM.   *   * @version 1.0   * @author  Jeffrey M. Hunter  (jhunter@idevelopment.info)   * @author  http://www.idevelopment.info   * -----------------------------------------------------------------------------   */     public class DOMExample {         /*       * +---------------------------------------------+       * | METHOD: main                                |       * +---------------------------------------------+       */      static public void main(String[] argv) {          try {                 if (argv.length != 1) {                  // must pass in the name of the XML file                  System.err.println("Usage: java DOMExample filename");                  System.exit(1);              }                 // Get an instance of the parser              DOMParser parser = new DOMParser();                 // Generate a URL from the filename              URL url = createURL(argv[0]);                 // Set various parser options; validation on,              // warnings shown, error stream set to stderr.              parser.setErrorStream(System.err);              parser.setValidationMode(true);              parser.showWarnings(true);              // parse the document              parser.parse(url);                 // Obtain the document              XMLDocument doc = parser.getDocument();                 // print document elements              System.out.print("The elements are: ");              printElements(doc);                 // print document elements attributes              System.out.println("The attributes of each element are: ");              printElementAttributes(doc);             } catch (Exception e) {              System.out.println(e.toString());          }      }         /*       * +---------------------------------------------+       * | METHOD: printElements                       |       * +---------------------------------------------+       */      static void printElements(Document doc) {             NodeList nodelist = doc.getElementsByTagName("*");          Node     node;             for (int i=0; i<nodelist.getLength(); i++) {              node = nodelist.item(i);              System.out.print(node.getNodeName() + " ");          }             System.out.println();         }         /*       * +---------------------------------------------+       * | METHOD: printElementAttributes              |       * +---------------------------------------------+       */      static void printElementAttributes(Document doc) {             NodeList      nodelist = doc.getElementsByTagName("*");          Node          node;          Element       element;          NamedNodeMap  nnm = null;             String attrname;          String attrval;          int    i, len;             len = nodelist.getLength();             for (int j=0; j < len; j++) {              element = (Element)nodelist.item(j);              System.out.println(element.getTagName() + ":");              nnm = element.getAttributes();          }             if (nnm != null) {              for (i=0; i<nnm.getLength(); i++) {                  node = nnm.item(i);                  attrname = node.getNodeName();                  attrval  = node.getNodeValue();                  System.out.println(" " + attrname + " = " + attrval);              }          }             System.out.println();         }         /*       * +---------------------------------------------+       * | METHOD: createURL                           |       * +---------------------------------------------+       */      static URL createURL(String filename) {             URL url = null;             try {              url = new URL(filename);          } catch (MalformedURLException ex) {              try {                  File f = new File(filename);                  url = f.toURL();              } catch (MalformedURLException e) {                  System.out.println("Cannot create URL for: " + filename);                  System.exit(0);              }          }             return url;         }     }

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