SpringBoot 官方文档示例：(69)使用MongoDatabaseFactory来操作Mongodb

一、注入MongoDatabaseFactory

@Autowired
    private MongoDatabaseFactory mongo;

二、使用MongoDatabaseFactory

@RequestMapping("/test2")
    public List<Document> test2(){
        MongoDatabase mongoDatabase = mongo.getMongoDatabase();
        MongoCollection<Document> documents = mongoDatabase.getCollection("userInfo");
        List<Document> documentList = new ArrayList<>();
        documents.find().forEach(doc -> documentList.add(doc));

        return documentList;
        
    }

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接口直接返回MongoCollection类型报错。