How to upload and retrieve file in mongodb in spring boot application without using GridFSTemplate?

I could finally figure out the way to store files without using GridFS in mongodb. First thing you have to note that we have to store byte[] representation of file.

import org.bson.types.Binary;import org.springframework.data.annotation.Id;import org.springframework.data.mongodb.core.mapping.Document;import org.springframework.data.mongodb.core.mapping.Field;@Documentpublic class DemoDocument {    @Id    @Field    private String id;    @Field    private String emailId;    @Field    private String docType;    @Field    private Binary file;}

Make sure your file object is org.bson.types.Binary.Following is my controller code to save object in monogodb.

@PostMapping("/upload")public String singleFileUpload(@RequestParam("file") MultipartFile multipart, @RequestParam("email") String email) {    try {        DemoDocument demoDocument = new DemoDocument();        demoDocument.setEmailId(email);        demoDocument.setDocType("pictures");        demoDocument.setDocument(new Binary(BsonBinarySubType.BINARY, multipart.getBytes()));        mongoTemplate.insert(demoDocument);        System.out.println(demoDocument);    } catch (Exception e) {        e.printStackTrace();        return "failure";    }    return "success";}

You can retrieve this object from mongodb as following.

@PostMapping("/retrieve")public String retrieveFile(@RequestParam("email") String email){    DemoDocument demoDocument = mongoTemplate.findOne(new BasicQuery("{emailId : \""+email+"\", docType : \"pictures\"}"), DemoDocument.class);    System.out.println(demoDocument);    Binary document = demoDocument.getDocument();    if(document != null) {        FileOutputStream fileOuputStream = null;        try {            fileOuputStream = new FileOutputStream(RETRIEVE_FOLDER + "prof_pic.jpg");            fileOuputStream.write(document.getData());        } catch (Exception e) {            e.printStackTrace();            return "failure";        } finally {            if (fileOuputStream != null) {                try {                    fileOuputStream.close();                } catch (IOException e) {                    e.printStackTrace();                    return "failure";                }            }        }    }    return "success";}

Please note this is just sample working code for understanding. It can be written in fully object oriented way keeping design principles in mind.