Write file stream to response in Struts2 applicaiton

This code snippet shows the correct way to write file steam to the HTTP Response in an Struts2 applicaiton

// Following entry in the Struts Config XML

 <action name="exportToPdf" class="pdfGenerateAction" method="fnExportToPdf">
   <result name="SUCCESS" type="stream">
    <param name="contentType">application/pdf</param>
    <param name="inputName">dataStreamForPdf</param>
    <param name="bufferSize">1024</param>
   </result>
  </action>

Note: Make sure that the inputName param is defined in the action class as a java.io.InputStream with exactly the same name as defined in the struts config xml.
Following is the code in the Struts2 Action class

import com.lowagie.text.pdf.*;
import com.lowagie.text.*;

public class BacklogSelectionScreenAction
{
 private InputStream dataStreamForPdf;


 public String fnExportToPdf()
 {
  String status = "SUCCESS";
  
  ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); 
  try {
      
   
      Document myDocument =new Document();
      PdfWriter.getInstance(myDocument,outputStream);   
      myDocument.open(); 
        
   
             dataStreamForPdf = (new ByteArrayInputStream(outputStream.toByteArray()));
      
     }
     catch(Exception ex)
     {
      ex.printStackTrace();
      status = "ERROR";
     }
      
  return status;
  
 }


}