How to fix an error `Java heap space` when downloading large files (GB) using Liferay

Question

I am using this code to download an existing file from the server on Liferay (6.2) into a local pc:

`

    File file = getFile(diskImage.getImageType(), d         


        

Answer 1

ServletResponseUtil.sendFile(httpReq, httpResp, file.getName(), input, "application/octet-stream"); what's this?

Don't read a file once time.Use a buffer.

response.reset();
response.setContentType("application/x-download");
response.addHeader("Content-Disposition","attachment;filename="+new String(filename.getBytes(),"utf-8"));
response.addHeader("Content-Length",""+file.length());
OutputStream toClient=new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
byte[] buffer=new byte[1024*1024*4];
int i=-1;
while((i=fis.read(buffer))!=-1){
  toClient.write(buffer,0,i);
}
fis.close();
toClient.flush();
toClient.close();