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

getResource(com.mongodb.client.gridfs.model.GridFSFile file) function of GridFsTemplate returns the GridFsResource for a GridFSFile.

GridFSFile gridfsFile= gridFsTemplate.findOne(new 
Query(Criteria.where("filename").is(fileName)));
GridFsResource gridFSResource= gridFsTemplate.getResource(gridfsFile);
InputStream inputStream= gridFSResource.getInputStream();

If the above one is not working in some higher version of Spring boot, use the bellow:

GridFSFile gridfsFile= gridFsTemplate.findOne(new 
Query(Criteria.where("filename").is(fileName)));
//or
GridFSFile  gridfsFile = 
gridFsOperations.findOne(Query.query(Criteria.where("filename").is(fileName)));
 return ResponseEntity.ok()
                .contentLength(gridFsdbFile.getLength())
                .contentType(MediaType.valueOf("image/png"))
                .body(gridFsOperations.getResource(gridFsdbFile));