Large file download using grails

Question

I am working on a grails application, it has a file sharing feature. It uploads files onto the server and allows user to download the file from server. I used the following code for this :

def file = new java.io.File(filePath)
response.setContentType( "application-xdownload")
response.setHeader("Content-Disposition", "attachment;filename=${fileName}")
response.getOutputStream() << new ByteArrayInputStream(file.getBytes())

This code works fine for small files but when the size of file is increased, i.e. >100MB, it gives me the following error :

java.lang.OutOfMemoryError: Java heap space

So, what can I do to make my application be able to download large files ? Thanks

Answer 1

Instead of loading the file into memory, replace

response.getOutputStream() << new ByteArrayInputStream(file.getBytes())

With:

file.withInputStream { response.outputStream << it }