File is not getting download using JERSEY

Question

I am using jersey API in my project. I stuck in a case that file needs to be downloaded but it's not. My code is as follow

@GET
@Produces("application/download")
public Response downloadFile(){ 
    String data = getDatas();
    ResponseBuilder response = Response.ok(data);
    response.header("Content-Disposition","attachment;filename=UserData.txt");
    response.header("charset", "UTF-8");
    return Response.build(); 
}

I have added all the packages, paths are also fine. No Error came.

When I call this API, data comes in the response. I want this data to be in a file and in a downloadable format.

I also tried @Produces(MediaType.APPLICATION_OCTET_STREAM).

Please correct me if am doing wrong

Answer 1

I think you are not sending the response you have build.

first you're using a ResponseBuilder to build the resposne

ResponseBuilder response = Response.ok(data);
response.header("Content-Disposition","attachment;filename=UserData.txt");
response.header("charset", "UTF-8");

then you are returning the static Response.build() (notice the capital R) object, which is empty

you should return response.build()

also, you should produce octet-stream in your method annotions

@Produces(MediaType.APPLICATION_OCTET_STREAM)

and not

@Produces("application/download")

refer to this question: what's the correct way to send a file from REST web service to client?