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Tip of the Day
Language: Java
Expertise: Intermediate
Oct 7, 2008

Read an XML Document with the StAX Iterator API

This tip shows an example of how to use the Iterator API to read from an XML file:

import javax.xml.stream.*;
import javax.xml.stream.events.*;
import java.io.*;

public class StAXBasicEventReader{
   public StAXBasicEventReader(){}
 
   public static void main(String[] args)
      {
      XMLInputFactory XMLif=null;
      XMLEventReader XMLer=null;
              
      System.setProperty("javax.xml.stream.XMLInputFactory",    
                         "com.sun.xml.stream.ZephyrParserFactory");
      
      //get an XMLInputFactory object
         XMLif=XMLInputFactory.newInstance();
       
      //setting the XMLInputFactory corectly 
        XMLif.setProperty("javax.xml.stream.isSupportingExternalEntities",Boolean.TRUE);
XMLif.setProperty("javax.xml.stream.isNamespaceAware",Boolean.TRUE);
XMLif.setProperty("javax.xml.stream.isReplacingEntityReferences",Boolean.TRUE);
                                    
      //getting an XMLEventReader object
      try{
         XMLer=XMLif.createXMLEventReader( 
         "file:///C://Data_Local//xml//docs//",
         new FileReader("C://Data_local 
         //xml//docs//AirWings_xml.xml"));         
         }catch(java.io.FileNotFoundException e)
            {System.out.println(e.getMessage());
         }catch(javax.xml.stream.XMLStreamException e)    
               {System.out.println(e.getMessage());}
                                 
      //getting the events
      try{
         while(XMLer.hasNext())
               {
               XMLEvent event=XMLer.nextEvent();
               //XMLEvent event=(XMLEvent)XMLer.next();
               int event_type=event.getEventType();
               
    switch(event_type)
      {
      case XMLStreamConstants.START_DOCUMENT:
      System.out.println(">Start-Document<"+"Code:"+event_type);
      break;
                         
      case XMLStreamConstants.END_DOCUMENT:
      System.out.println(">End-Document<"+"Code:"+event_type);
      break;
                                                                             
      case XMLStreamConstants.START_ELEMENT:
      System.out.println(">Start-Element<"+"Code:"+event_type);
      break;
                          
      //...
      }                                                                                 
    }
            
    //clean up                
    XMLer.close(); 

    }catch(javax.xml.stream.XMLStreamException e)
               {System.out.println(e.getMessage());}          
     }        
} 
Leonard Anghel
 
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