SAX生成和解析XML文档，saxxml文档,为解决DOM的问题，出现

SAX生成和解析XML文档，saxxml文档,为解决DOM的问题，出现

为解决DOM的问题，出现了SAX。SAX ，事件驱动。当解析器发现元素开始、元素结束、文本、文档的开始或结束等时，发送事件，程序员编写响应这些事件的代码，保存数据。优点：不用事先调入整个文档，占用资源少；SAX解析器代码比DOM解析器代码小，适于Applet，下载。缺点：不是持久的；事件过后，若没保存数据，那么数据就丢了；无状态性；从事件中只能得到文本，但不知该文本属于哪个元素；使用场合：Applet;只需XML文档的少量内容，很少回头访问；机器内存少；

package com.alisoft.facepay.framework.bean;   import java.io.FileInputStream;   import java.io.FileNotFoundException;   import java.io.IOException;   import java.io.InputStream;   import javax.xml.parsers.ParserConfigurationException;   import javax.xml.parsers.SAXParser;   import javax.xml.parsers.SAXParserFactory;   import org.xml.sax.Attributes;   import org.xml.sax.SAXException;   import org.xml.sax.helpers.DefaultHandler;   /**  *   * @author hongliang.dinghl  * SAX文档解析  */ public class SaxDemo implements XmlDocument {   public void createXml(String fileName) {   System.out.println("<<"+filename+">>");   }   public void parserXml(String fileName) {   SAXParserFactory saxfac = SAXParserFactory.newInstance();   try {   SAXParser saxparser = saxfac.newSAXParser();   InputStream is = new FileInputStream(fileName);   saxparser.parse(is, new MySAXHandler());   } catch (ParserConfigurationException e) {   e.printStackTrace();   } catch (SAXException e) {   e.printStackTrace();   } catch (FileNotFoundException e) {   e.printStackTrace();   } catch (IOException e) {   e.printStackTrace();   }   }   }   class MySAXHandler extends DefaultHandler {   boolean hasAttribute = false;   Attributes attributes = null;   public void startDocument() throws SAXException {   System.out.println("文档开始打印了");   }   public void endDocument() throws SAXException {   System.out.println("文档打印结束了");   }   public void startElement(String uri, String localName, String qName,   Attributes attributes) throws SAXException {   if (qName.equals("employees")) {   return;   }   if (qName.equals("employee")) {   System.out.println(qName);   }   if (attributes.getLength() > 0) {   this.attributes = attributes;   this.hasAttribute = true;   }   }   public void endElement(String uri, String localName, String qName)   throws SAXException {   if (hasAttribute && (attributes != null)) {   for (int i = 0; i < attributes.getLength(); i++) {   System.out.println(attributes.getQName(0)   + attributes.getValue(0));   }   }   }   public void characters(char[] ch, int start, int length)   throws SAXException {   System.out.println(new String(ch, start, length));   }   }  package com.alisoft.facepay.framework.bean; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; /** * * @author hongliang.dinghl * SAX文档解析 */public class SaxDemo implements XmlDocument { public void createXml(String fileName) { System.out.println("<<"+filename+">>"); } public void parserXml(String fileName) { SAXParserFactory saxfac = SAXParserFactory.newInstance(); try { SAXParser saxparser = saxfac.newSAXParser(); InputStream is = new FileInputStream(fileName); saxparser.parse(is, new MySAXHandler()); } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } class MySAXHandler extends DefaultHandler { boolean hasAttribute = false; Attributes attributes = null; public void startDocument() throws SAXException { System.out.println("文档开始打印了"); } public void endDocument() throws SAXException { System.out.println("文档打印结束了"); } public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { if (qName.equals("employees")) { return; } if (qName.equals("employee")) { System.out.println(qName); } if (attributes.getLength() > 0) { this.attributes = attributes; this.hasAttribute = true; } } public void endElement(String uri, String localName, String qName) throws SAXException { if (hasAttribute && (attributes != null)) { for (int i = 0; i < attributes.getLength(); i++) { System.out.println(attributes.getQName(0) + attributes.getValue(0)); } } } public void characters(char[] ch, int start, int length) throws SAXException { System.out.println(new String(ch, start, length)); } }//该片段来自于http://byrx.net