How to get a binary stream by GridFS ObjectId with Spring Data MongoDB

Question

I can\'t figure out how to stream a binary file from GridFS with spring-data-mongodb and its GridFSTemplate when I already have the right ObjectId.

Answer 1

@RequestMapping(value = "/api ")
public class AttachmentController {

private final GridFsOperations gridFsOperations;

@Autowired
public AttachmentController(GridFsOperations gridFsOperations) {
    this.gridFsOperations = gridFsOperations;
}

@GetMapping("/file/{fileId}")
public ResponseEntity getFile(@PathVariable String fileId) {
GridFSFile file = 
gridFsOperations.findOne(Query.query(Criteria.where("_id").is(fileId)));

    return ResponseEntity.ok()
            .contentLength(file.getLength())
            .body(gridFsOperations.getResource(file));
}