重写GridFsTemplate类， MongoDB文件库实现同名文件共存 顶

public GridFsResource getResource(String location) {
    GridFSFile file = findOne(query(whereFilename().is(location)));
    return file != null ? new GridFsResource(file, getGridFs().openDownloadStream(location)) : null;
}

@Component
public class GridFsAssistant {

    @Value("${spring.data.mongodb.database}")
    private String database;

    private final MongoClient mongoClient;

    @Autowired
    public GridFsAssistant(MongoClient mongoClient) {
        this.mongoClient = mongoClient;
    }

    public MongoDatabase getMongoDB(String databaseName) {
        return mongoClient.getDatabase(databaseName);
    }

    public MongoDatabase getDefaultMongoDB() {
        return getMongoDB(database);
    }

    public GridFSDownloadStream getResource(ObjectId storedId) {
        GridFSBucket gridFSBucket = GridFSBuckets.create(getDefaultMongoDB());
        MongoCollection<Document> coll = getDefaultMongoDB().getCollection("fs.files");
        FindIterable<Document> file = coll.find(eq("_id", storedId));
        return file.first() != null ? gridFSBucket.openDownloadStream(storedId) : null;
    }
}