download file java spring rest api

Question

I want to make a rest API controller (spring boot) that when petitioned with a get will allow me to download an Excel file. Currently I have this endpoint:

@RequestMapping(value = "/download.xls", method = RequestMethod.GET)
public ResponseEntity Survey_Reports(@RequestParam(value = "evaluated") String evaluated){

    return surveyService.getSurveysFile(evaluated);

}

which ultimately calls to this method:

public static ResponseEntity getDownloadResponse() {

    File file2Upload = new File("Survey_Reports.xls");

    Path path = Paths.get(file2Upload.getAbsolutePath());
    ByteArrayResource resource = null;
    try {
        resource = new ByteArrayResource(Files.readAllBytes(path));
    } catch (IOException e) {
        logger.error("there was an error getting the file bytes ", e);
    }

    return ResponseEntity.ok()
            .contentLength(file2Upload.length())

//this line doesn't seem to work as I set the file format in the controller request mapping
            .contentType(MediaType.parseMediaType("application/vnd.ms-excel"))
            .body(resource);
}

everything seems to work semi-fine as I get the download.xls(as the mapping) file correctly, but now I want to make the downloaded file have some specific name like: evaluatedName.xls or userDateEndDate.xls or some other stuff, is there a way to edit the response entity to do so? so that I don't have to name the mapping "download.xls"

Answer 1

In context of HttpServletResponse response you can do this like this

response.setContentType("application/csv");
response.setHeader("Content-Disposition", "attachment; filename=" + csvName);

and for ResponseEntity i assume you can use something like this:

 ResponseEntity.ok().header("Content-Disposition","attachment; filename=" + csvName );