How to download a csv/excel file stored in a server using OA Framwork

Question

Hi All,
We have a requirement where we have to generate a CSV file using PL/SQL block and the user shoul download that csv file to his client machine whenever it requirs to him. We have generated csv file and save the same in a particular location in the server. As the CSV file size may be around 10 to 15 MB we feel the storing and retrieving of the csv file in a BLOB object is a performance hit. Now we want to dowload the file from the csv file path without storing the csv file into database BLOB object.
Is this possible using OA framwork? if so please guide me how to do this.
Thanks in advance.
Regards,
Sathesh.

Answer 1

If u know following details you can use below method to download any file ( XLS/any) its generic method I have used in one of my project-
1. File Name with Extension
2. File path at which it has been placed
3. Page Context (you must know i assume)
public void DownloadFileFromServer(OAPageContext pgeContext, String file_name_with_path,
String file_name_with_ext)
System.out.println("Filename path "+file_name_with_path + "File Name:" + file_name_with_ext);
HttpServletResponse responseVar = (HttpServletResponse)pageContext.getRenderingContext().getServletResponse();
if (((file_name_with_path == null) || ("".equals(file_name_with_path))))
System.out.println("File path is invalid.");
File fileToDwnld = null;
try
fileToDwnld = new File(file_name_with_path);
catch (Exception e)
System.out.println("Invalid File Path or file does not exist.");
if (!fileToDwnld.exists())
System.out.println("File does not exist.");
if (!fileToDwnld.canRead())
System.out.println("Not Able to read the file.");
String MADfileType = getMADMimeType(file_name_with_ext);
System.out.println("File Type - " + MADfileType);
responseVar.setContentType(MADfileType);
responseVar.setContentLength((int)fileToDwnld.length());
System.out.println("File Size is " + fileToDwnld.length());
responseVar.setHeader("Content-Disposition", "attachment; filename=\"" + file_name_with_ext + "\"");
InputStream inStr = null;
ServletOutputStream outStr = null;
try
outStr = responseVar.getOutputStream();
inStr = new BufferedInputStream(new FileInputStream(fileToDwnld));
int ch;
while ((ch = inStr.read()) != -1)
outStr.write(ch);
catch (IOException e)
e.printStackTrace();
finally
try
outStr.flush();
outStr.close();
if (inStr != null)
inStr.close();
catch (Exception e)
e.printStackTrace();
Edited by: aprak on Oct 18, 2011 1:08 AM
Edited by: aprak on Oct 18, 2011 1:09 AM