Question

I have a system built with Spring Framework 3 and now I must implement a file download.
To execute the “donwload action” I usually get the HttpServletReponse object, set the headers and get the user outputstream from it.

It works well, but I’d like to know if there’s an easier/smarter way to do it?

Many thanks!

Answer 1

You can use @ResponseBody and return a byte[]

@RequestMapping("/getImage")
@ResponseBody
public byte[] getImage(HttpServletResponse response) throws IOException {
    File imageFile = new File("image.jpg");
    byte[] bytes = org.springframework.util.FileCopyUtils.copyToByteArray(imageFile);

    response.setHeader("Content-Disposition", "attachment; filename=\"" + imageFile.getName() + "\"");
    response.setContentLength(bytes.length);
    response.setContentType("image/jpeg");

    return bytes;
}