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Getting Attributes And its Value
Posted on: June 20, 2007 at 12:00 AM

In this section, you will learn to retrieve the attributes and their value from a XML document using the SAX APIs.

Getting Attributes And its Value

In this section, you will learn to retrieve the attributes and their value from a XML document using the SAX APIs.

Description of program:

This program helps you in retrieving attributes and their values. The parse() method is invoked by the SAXParser object. Override startElement() method in SAXHandler class to provide functionality to get the attribute and its value from a xml file.

Here is the XML File: sample.xml

<Employee-detail >
<Employee name="Amit" >
<address>My address</address>
   </Employee>
   <issued-items>
<item code="111" type="CD" label=" music" />
<item code="222" type="DVD" label=" video"/>
   </issued-items>
</Employee-detail>

Here is the Java File: ReadAttributes.java


import java.io.*;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.*;

import org.xml.sax.helpers.DefaultHandler;

import org.apache.xerces.util.* ;

import org.apache.xerces.impl.*;

import org.apache.xerces.parsers.*;

import org.apache.xerces.jaxp.*;



public class ReadAttributes {

  public static void main(String[] args) {

  try {

  BufferedReader bf = new BufferedReader(

  new InputStreamReader(System.in));

  System.out.print("Enter a xml file name: ");

  String xmlFile = bf.readLine();

  File file = new File(xmlFile);

  if (file.exists()){

  //SAX-implementation:

  SAXParserFactory factory = SAXParserFactory.newInstance();

  // Create SAX-parser

  SAXParser parser = factory.newSAXParser();

  System.out.println("Name:\t" + "Value:");

  //Define a handler

  SaxHandler handler = new SaxHandler();

  // Parse the xml document

  parser.parse(xmlFile, handler);

  }

  else{

  System.out.println("File not found!");

  }

  } 

  catch (Exception e) {

  e.printStackTrace();

  }

  }

  

  private static class SaxHandler extends DefaultHandler {

  public void startElement(String uri, String localName, 

  String qName, Attributes attrs) 

  throws SAXParseException,SAXException {

  int length = attrs.getLength();

  //Each attribute

  for (int i=0; i<length; i++) {

  // Get names and values to each attribute

  String name = attrs.getQName(i);

  System.out.print(name);

  String value = attrs.getValue(i);

  System.out.println("\t"+value);

  }

  }

  }

}

Download this example.

Output of this program:

C:\vinod\xml\sax1>javac ReadAttributes.java

C:\vinod\xml\sax1>java ReadAttributes
Enter a xml file name: sample.xml
Name: Value:
name Amit
code 111
type   CD
label   music
code 222
type   DVD
label video

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