Servlet Download Problem

[Thangavelu Vishwanathan]

Hi,

I am using a servlet for downloading my octet-stream file from server. Its working fine when the size of the file is above 0 bytes. If the file size is 0 bytes the file is not downloaded and I am getting http 502 error in server.

Anybody have solution for this issue?

Here is my code:

    	HttpSession session = null;
    	response.reset();
    	session = request.getSession();
    	try {
    		String fileTest = null;
    		String file = null;
    		
    		fileTest = (String) session.getAttribute("DOWNLOADSESSION");
    		
    		file = fileTest.substring(fileTest.lastIndexOf("/") + 1,fileTest.length());    			
    			
    			
    			response.setContentType("application/binary");
    			response.setHeader("Content-Disposition","attachment; filename=" + file + ";");
    			
    			FileInputStream fin = new FileInputStream(fileTest);
    			ServletOutputStream out = response.getOutputStream();
    			
    			byte[] b = new byte[fin.available()];
    			int len = 0;
    			while ((len = fin.read(b)) != -1) {			
    				out.write(b, 0, len);
    			}   			
    			    			
    			out.flush();
    			out.close();
    			return;
    	}
		catch (Exception e) {
			LOG.error("Exception while processing request::"+e.getMessage());
		}
		

[Devaka Cooray]

Just a side question: why do you need to download a file with 0 bytes?

[Thangavelu Vishwanathan]

I have kept a download option but when the file size is 0 bytes also it must show me a empty file.

[Wouter Oet]

What is the exception you're getting?

[Thangavelu Vishwanathan]

I didnt get any exception, but when i click the download link, the browser status bar is keep on loading. In addition I am getting the Http 502 Bat Gateway error.

[Satya Maheshwari]

I suggest you put a breakpoint in your servlet code and see what 's going wrong.

[Thangavelu Vishwanathan]

Hi Friends,

Thank You all,

Its a problem of application server and not in the coding part.