spring data mongodb如何注入得到GridFsOperations对象？

代码如下：
@Configuration
public class SpringMongoConfig extends AbstractMongoConfiguration{

@Bean
public GridFsTemplate gridFsTemplate() throws Exception {
    return new GridFsTemplate(mongoDbFactory(), mappingMongoConverter());
}

@Override
protected String getDatabaseName() {
    return "clouddisk";
}

@Override
@Bean
public Mongo mongo() throws Exception {
    return new MongoClient("127.0.0.1");
}

ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringMongoConfig.class);
GridFsOperations gridOperations = (GridFsOperations) ctx.getBean("gridFsTemplate");
问如何在dao层注入得到这个对象 ？？？

@Autowired
    GridFsTemplate gridFsTemplate;