How to delete file after REST response [duplicate]

Answer 1

There is a more elegant solution, don't write a file, just write directly to the output stream contained in the instance of Response.

Answer 2

Use a StreamingOutput as entity:

final Path path;
...
return Response.ok().entity(new StreamingOutput() {
    @Override
    public void write(final OutputStream output) throws IOException, WebApplicationException {
        try {
            Files.copy(path, output);
        } finally {
            Files.delete(path);
        }
    }
}

Answer 3

Without knowing the context of your application, you can delete the file when the VM exits:

file.deleteOnExit();    

See: https://docs.oracle.com/javase/7/docs/api/java/io/File.html#deleteOnExit%28%29

Answer 4

I did something like this recently in rest service development using jersey

@GET
@Produces("application/zip")
@Path("/export")
public Response exportRuleSet(@QueryParam("ids") final List<String> ids) {

    try {
        final File exportFile = serviceClass.method(ruleSetIds);

        final InputStream responseStream = new FileInputStream(exportFile);


        StreamingOutput output = new StreamingOutput() {
            @Override
            public void write(OutputStream out) throws IOException, WebApplicationException {  
                int length;
                byte[] buffer = new byte[1024];
                while((length = responseStream.read(buffer)) != -1) {
                    out.write(buffer, 0, length);
                }
                out.flush();
                responseStream.close();
               boolean isDeleted = exportFile.delete();
                log.info(exportFile.getCanonicalPath()+":File is deleted:"+ isDeleted);                 
            }   
        };
        return Response.ok(output).header("Content-Disposition", "attachment; filename=rulset-" + exportFile.getName()).build();
    }

Answer 5

send file name on response:

return response.header("filetodelete", FILE_OUT_PUT).build();

after that you can send delete restful method

@POST
@Path("delete/{file}")
@Produces(MediaType.TEXT_PLAIN)
public void delete(@PathParam("file") String file) {

    File delete = new File(file);

    delete.delete();

}

Answer 6

save the response in a tmp variable with replacing your return statement like this:

Response res = response.build();
//DELETE your files here.
//maybe this is not the best way, at least it is a way.
return res;