Posted this query several times but no reply. Please help me out

Question

Hi all,
How to know whether a servlet had completely sent its response to the request.
The problem what i am facing is, I send response to a client's request as a file.
The byte by byte transfer happens, now if the client interrupts or cancels the operation, the response is not completed.
At this stage how to know the response status. I am handling all exception, even then I am unable to trap the status.
Please help me out.
I have posted this query several times but no convincing reply till now. Hence please help me out.
If somebody wants to see the code. I'll send it through mail.
regards
venkat

Answer 1

Hi,
thanks for the reply,
Please check the code what I have written. The servlet if I execute in Javawebserver2.0 I could trap the exception. If the same servlet is running in weblogic 6.0 I am unable to get the exception.
Please note that I have maintained counter and all necessary exception handling even then unable to trap the exception.
//code//
import java.io.*;
import java.net.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.security.*;
public class TestServ extends HttpServlet
Exception exception;
public void doGet(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException, UnavailableException
     int bytesRead=0;
     int count=0;
     byte[] buff=new byte[1];
OutputStream out=res.getOutputStream ();
res.setContentType( "application/pdf"); // MIME type for pdf doc
String fileURL ="http://localhost:7001/soap.pdf";
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
boolean download=false;
     int fsize=0;
     res.setHeader("Content-disposition", "attachment; filename="+"soap.pdf" );
try
               URL url=new URL(fileURL);
     bis = new BufferedInputStream(url.openStream());
     fsize=bis.available();
     bos = new BufferedOutputStream(out);
while(-1 != (bytesRead = bis.read(buff, 0, buff.length)))
          try
                    bos.write(bytesRead);
                    count +=bytesRead;
                    bos.flush();
               }//end of try for while loop
               catch(StreamCorruptedException ex)
                    System.out.println("Exception ="+ex);
                    setError(ex);
                    break;
               catch(SocketException e)
                    setError(e);
                    break;
               catch(Exception e)
                    System.out.println("Exception in while of TestServlet is " +e.getMessage());
                    if(e != null)
                         System.out.println("File not downloaded properly"+e);
                         setError(e);
                         break;
                    }//if ends
               }//end of catch for while loop
}//while ends
          Exception eError=getError();
          if(eError!=null)
               System.out.println("\n\n\n\nFile Not DownLoaded properly\n\n\n\n");
          else if(bytesRead == -1)
          System.out.println("\n\n\n\ndownload \nsuccessful\n\n\n\n");
          else
          System.out.println("\n\n\n\ndownload not successful\n\n\n\n");
catch(MalformedURLException e)
System.out.println ( "Exception inside TestServlet is " +e.getMessage());
catch(IOException e)
System.out.println ( "IOException inside TestServlet is " +e.getMessage());
     finally
          try
     if (bis != null)
     bis.close();
     if (bos != null)
     {bos.close();}
          catch(Exception e)
               System.out.println("here ="+e);
}//doPost ends
public void setError(Exception e)
     exception=e;
     System.out.println("\n\n\nException occurred is "+e+"\n\n\n");
public Exception getError()
          return exception;
}//class ends
//ends
regards,
venakt