SAX Parser In JAVA

The following code demonstrates the use of sax parser in JAVA :

main function wherein you initialise the parser and call for parsing the file

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/****************************  * author: Aniruddha SN  *  */   import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.io.InputStreamReader; import customHandler.anrSaxHandler; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.InputSource;   public class XMLParser {     public static void main(String args[])         {                 try                 {                 //create an input source for parsing                 //u can accept the file path as argument, harcoding for example                 File myfile= new File("c:\\temp\\sample1.xml");                 InputStream inputstream= new FileInputStream(myfile);                 InputStreamReader isr=new InputStreamReader(inputstream);                 InputSource inputsource=new InputSource(isr);                                 //initialise the sax parser                 SAXParserFactory saxfact=SAXParserFactory.newInstance();                 SAXParser saxparser=saxfact.newSAXParser();                                 //call parse funstion  with a custom sax handler object as input                 saxparser.parse(inputsource,new anrSaxHandler());                                 }                 catch(Exception e)                 {                         System.out.println(e.getMessage());                 }         } }

custom SAX handler to override  the functionality:

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/*****************************  * author: Aniruddha S N  */ package customHandler; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler;   public class anrSaxHandler extends DefaultHandler {             //function informs the sax event begining of a new element         public void startElement(String uri, String localName,String qName,             Attributes attributes) throws SAXException {                                 // u can write ur functionality here                                 //sample functionality to print the element name and its attributes                                 System.out.println("Reading element:"+qName+"\n");                 System.out.println("Attributes of the element and their values:\n");                 for(int i=0;i<attributes.getLength();i++)                 {                         System.out.println(attributes.getLocalName(i)+": "+attributes.getValue(i)+"\n");                 }                 System.out.println("Data:");         }                 //function informs the occurence of sax event end of an element         public void endElement(String uri, String localName,                         String qName) throws SAXException {                   //planned action on end of element can be added here                                 //sample functionality forprinting the element name                                                 System.out.println("Finished Reading element:"+qName+"\n");                         }            //function provides the data within a tag         public void characters(char ch[], int start, int length) throws SAXException {                                                 //sample functionality to store data in a string and print it                                                    String data=new String(ch,start, length);                    System.out.println(""+data+"\n");                                         } }

sample file:

Results Of Parsing:

Reading element:catalog
 
Attributes of the element and their values:
 
Data:
 
   
 
Reading element:book
 
Attributes of the element and their values:
 
id: bk101
 
Data:
 
      
 
Reading element:author
 
Attributes of the element and their values:
 
Data:
Gambardella, Matthew
 
Finished Reading element:author
 
 
      
 
Reading element:title
 
Attributes of the element and their values:
 
Data:
XML Developer's Guide
 
Finished Reading element:title
 
 
      
 
Reading element:genre
 
Attributes of the element and their values:
 
Data:
Computer
 
Finished Reading element:genre
 
 
      
 
Reading element:price
 
Attributes of the element and their values:
 
Data:
44.95
 
Finished Reading element:price
 
 
      
 
Reading element:publish_date
 
Attributes of the element and their values:
 
Data:
2000-10-01
 
Finished Reading element:publish_date
 
 
      
 
Reading element:description
 
Attributes of the element and their values:
 
Data:
An in-depth look at creating applications 
      with XML.
 
Finished Reading element:description
 
 
   
 
Finished Reading element:book
 
 
 
 
Finished Reading element:catalog