​
        BasicDBObject dbObject = new BasicDBObject();
        dbObject.put("id", "123");
        dbObject.put("name", "haha");
        //指定返回的字段
        BasicDBObject fieldsObject = new BasicDBObject();
        fieldsObject.put("id", true);
        fieldsObject.put("name", true);
        fieldsObject.put("age", true);
        Query query = new BasicQuery(dbObject.toJson(), fieldsObject.toJson());
        List<JavaEntity> list= mongoTemplate.find(query, JavaEntity.class, "collectionName");

​