File get currupt if downloaded by response.getOutputStream();

Question

Hi,
I am trying to download file (of any type pdf/rar/any etc...) using following code,
but SOME TIME downloaded file is currupted.
            File file = new File(filePath);  
            if (file.exists()) {  
                if(isDebugEnabled)  
                    log.debug("File Found");  
            String quotes = "\"";    
            attachmentName =  quotes.concat(attachmentName).concat(quotes);  
            response.setContentType("application/unknown");  
            response.setHeader("Pragma", "public");  
            response.setHeader("Cache-Control", "max-age=0");  
            response.addHeader("Content-Disposition", "attachment; filename=" 
                    + attachmentName);  
            fileInputStream = new FileInputStream(file);  
            OutputStream tempStream = response.getOutputStream();  
            if (tempStream instanceof FileOutputStream && tempStream != null) {  
                destination = ((FileOutputStream) tempStream).getChannel();  
                source = new FileInputStream(file).getChannel();  
                destination.transferFrom(source, 0, source.size());  
            } else {  
                outputStream = tempStream;  
            int bytesRead;  
            while ((bytesRead = fileInputStream.read()) != -1){  
                outputStream.write(bytesRead);  
{code}
but when I use
{code}
       File f1=new File("MyFile");  
       OutputStream outputStream=new FileOutputStream(f1); 
{code}
insted of
{code}OutputStream tempStream = response.getOutputStream();  {code}   
It works, & download file by name "MyFile" in bin of tomcat folder.
but not work with response object.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Answer 1

I did that in finally, here is the whole function code,
public static boolean downloadAttachment(HttpServletResponse response,
               String filePath, String attachmentName) throws Exception {
          boolean fileDownloadedStatus = false;
          FileInputStream fileInputStream = null;
          OutputStream outputStream = null;
          FileChannel source = null;
          FileChannel destination = null;
          try {
               File file = new File(filePath);
               if (file.exists()) {
                    if(isDebugEnabled)
                         log.debug("File Found");
               String quotes = "\""; 
               attachmentName =  quotes.concat(attachmentName).concat(quotes);
               response.setContentType("application/unknown");
               response.setHeader("Pragma", "public");
               response.setHeader("Cache-Control", "max-age=0");
               response.addHeader("Content-Disposition", "attachment; filename="
                         + attachmentName);
               fileInputStream = new FileInputStream(file);
               OutputStream tempStream = response.getOutputStream();
               if (tempStream instanceof FileOutputStream && tempStream != null) {
                    destination = ((FileOutputStream) tempStream).getChannel();
                    source = new FileInputStream(file).getChannel();
                    destination.transferFrom(source, 0, source.size());
               } else {
                    outputStream = tempStream;
               int bytesRead;
               while ((bytesRead = fileInputStream.read()) != -1){
                    outputStream.write(bytesRead);
               fileDownloadedStatus = true;
          } catch (FileNotFoundException fileNotFoundException) {
               log.error("FileNotFoundException");
               throw fileNotFoundException;
          } catch (Exception exception) {
               log.error("Exception");
               throw exception;
          } finally {
               if (source != null)
                    source.close();
               if (destination != null)
                    destination.close();
               if (fileInputStream != null)
                    fileInputStream.close();
               if (outputStream != null)
                    outputStream.close();
          return fileDownloadedStatus;
     }     {code}
I also checked with outputstream.flush, but not working.