Spring MVC : large files for download, OutOfMemoryException

Question

How to provide large files for download through spring controller ? I followed few discussions on similar topic :

Downloading a file from spring controllers

Answer 1

For Spring , Need use InputStreamResource class in ResponseEntity .

Demo Code :

        MediaType mediaType = MediaTypeUtils.getMediaTypeForFileName(this.servletContext, fileName);
        System.out.println("fileName: " + fileName);
        System.out.println("mediaType: " + mediaType);

        File file = new File(DIRECTORY + "/" + fileName);
        InputStreamResource resource = new InputStreamResource(new FileInputStream(file));

        return ResponseEntity.ok()
                // Content-Disposition
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + file.getName())
                // Content-Type
                .contentType(mediaType)
                // Contet-Length
                .contentLength(file.length()) //
                .body(resource);
    }

Ref Link : https://o7planning.org/en/11765/spring-boot-file-download-example