Question

Hello i’m trying create an application allowing me host any kind of file.
In order to do it i’m exececuting following magic:

@RequestMapping(value = "/files/{file_name}", method = RequestMethod.GET)
    @ResponseBody
    public FileSystemResource 
    getFile(
            @PathVariable("file_name") String fileName) {
        System.out.println(fileName);
        String filePath = "./files/";
        return new FileSystemResource(new File(filePath+fileName)); 
    }

But this approach brings three unwanted problems:

1. Some random data is beeing appended to the file

2. The file gets opened in the browser window instead of beeing
   downloaded – i’ve tried to hack this using something like

   produces = “application/octet-stream”

   but it only resulted in 406 error.

3. The test.txt is beeing truncated into test, i found a walkaround in providing the app with test.txt/ as fileName but it looks a bit messy.

Answer 1

As stated on spring manual

As with @RequestBody, Spring converts the returned object to a
response body by using an HttpMessageConverter

I think your problem is spring doesn’t come with a HttpMessageConverter than can process FileSystemResource.

A list of builtin HttpMessageConverter is available here. I suggest you try converting your response into byte array somehow, maybe it will pick ByteArrayHttpMessageConverter instead and help solve your issue