PDF Download From Servlet

Question

Hi guys,
I'm having issues creating a file download servlet to download pdf files. I can successfully download text files using this code. For some reason however I cannot download a pdf using the same code. On execution, the browser will present me with a dialogue box asking me to open, save or cancel. If i open or save and open later I get an error message saying that the pdf file is corrupt or damaged and won't open properly. I have tried opening the original pdf on the server and there are no problems there. I have absolutely no idea why this is happening. Can someone point me in the right direction please.
     request.setAttribute("message", "This is a warning");
          String urlString = "test.jsp";
          DataInputStream dataInputStream=null;
          ServletOutputStream out = response.getOutputStream();
          String filePath = "/files";
          String originalFilename="test.pdf";
          File f = new File(originalFilename);
          response.setContentType("application/pdf");
          response.setContentLength((int) f.length());
          response.setHeader( "Content-Disposition", "attachment; filename=" +originalFilename );
          try{
               dataInputStream = new DataInputStream(new FileInputStream(filePath+originalFilename));
               byte[] bbuf = new byte[1024];
               dataInputStream.read() method
               while (dataInputStream.read(bbuf) != -1){
                    out.write(bbuf);
          } catch(IOException e){
               e.printStackTrace();
          } finally{
               dataInputStream.close();
               out.flush();
               out.close();
     }                   Thank You

Answer 1

Try this
in this scenario i'm reading file from databsae (Object type in SQLServer) as bytes
String path=getServletContext().getRealPath("/");
               byte[] buf = new byte[3 * 1024 * 1024];
               HashMap fileInfo=new HashMap();
          System.out.println("servlet called----> "+path);
          //String fileName=(String)arg0.getSession().getAttribute("fileName");
          int id=Integer.parseInt(arg0.getParameter("id"));
          String pageName=(String)arg0.getParameter("pageName");
          TrainingDBImpl dbImpl= new TrainingDBImpl();
          if(pageName.equals("Employee")){
               fileInfo=dbImpl.getEmpFile(id);     
          }else if(pageName.equals("Courses")){
               fileInfo=dbImpl.getFile(id);
          //fileInfo=dbImpl.getFile(id);
          //fileInfo=dbImpl.getEmpFile(id);
          String fileName=fileInfo.get("FileName").toString();
          buf=(byte[])fileInfo.get("EmployeeFile");
response.setHeader("Content-Disposition","attachment;filename=\""+fileName+"\"");
OutputStream out = response.getOutputStream();
          ByteArrayInputStream bain=new ByteArrayInputStream(buf);
     BufferedInputStream bIn = new BufferedInputStream(bain);
     int bytesRead;
     while ((bytesRead = bIn.read(buf)) != -1) {
     out.write(buf, 0, bytesRead);
     out.flush();
     bIn.close();
     out.close();