[JAVA] 간단한 XML SAX parsing 예제

출처: http://java.sun.com/xml/tutorial_intro.html

 

개념: SAXParser가 org.xml.sax.helpers.DefaultHandler에게 파싱된 tag(element)와 text를 차례로 전달한다.

 

import java.io.*;   import org.xml.sax.*; import org.xml.sax.helpers.DefaultHandler;   import javax.xml.parsers.SAXParserFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser;   public class Echo01 extends DefaultHandler {     public static void main(String argv[])     {         if (argv.length != 1) {             System.err.println("Usage: cmd filename");             System.exit(1);         }                 // Use an instance of ourselves as the SAX event handler         DefaultHandler handler = new Echo01();         // Use the default (non-validating) parser         SAXParserFactory factory = SAXParserFactory.newInstance();         try {             // Set up output stream             out = new OutputStreamWriter(System.out, "UTF8");               // Parse the input             SAXParser saxParser = factory.newSAXParser();             saxParser.parse( new File(argv[0]), handler);           } catch (Throwable t) {             t.printStackTrace();         }         System.exit(0);     }       static private Writer  out;       //===========================================================     // SAX DocumentHandler methods     //===========================================================       public void startDocument()     throws SAXException     {         emit("<?xml version='1.0' encoding='UTF-8'?>");         nl();     }       public void endDocument()     throws SAXException     {         try {             nl();             out.flush();         } catch (IOException e) {             throw new SAXException("I/O error", e);         }     }       public void startElement(String namespaceURI,                              String lName, // local name                              String qName, // qualified name                              Attributes attrs)     throws SAXException     {         String eName = lName; // element name         if ("".equals(eName)) eName = qName; // namespaceAware = false         emit("<"+eName);         if (attrs != null) {             for (int i = 0; i < attrs.getLength(); i++) {                 String aName = attrs.getLocalName(i); // Attr name                 if ("".equals(aName)) aName = attrs.getQName(i);                 emit(" ");                 emit(aName+"=\""+attrs.getValue(i)+"\"");             }         }         emit(">");     }       public void endElement(String namespaceURI,                            String sName, // simple name                            String qName  // qualified name                           )     throws SAXException     {         emit("</"+sName+">");     }       public void characters(char buf[], int offset, int len)     throws SAXException     {         String s = new String(buf, offset, len);         emit(s);     }       //===========================================================     // Utility Methods ...     //===========================================================       // Wrap I/O exceptions in SAX exceptions, to     // suit handler signature requirements     private void emit(String s)     throws SAXException     {         try {             out.write(s);             out.flush();         } catch (IOException e) {             throw new SAXException("I/O error", e);         }     }       // Start a new line     private void nl()     throws SAXException     {         String lineEnd =  System.getProperty("line.separator");         try {             out.write(lineEnd);         } catch (IOException e) {             throw new SAXException("I/O error", e);         }     } }