mongo中setMapKeyDotReplacement可設定用別的符號代替，多看原始碼就知道了，直接上程式碼：

@Configuration
@ComponentScan
@SpringBootApplication
@EnableEurekaClient
public class ReportApplication {

   @Autowired
public MongoDbFactory mongoFactory;

   @Autowired
public MongoMappingContext mongoMappingContext;

   @Bean
public MappingMongoConverter mongoConverter() throws 
 
Exception {
      DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoFactory);
      MappingMongoConverter mongoConverter = new MappingMongoConverter(dbRefResolver, mongoMappingContext);
      //this is my customization
mongoConverter.setMapKeyDotReplacement("-");
      mongoConverter.afterPropertiesSet();
      return 
 
mongoConverter;
   }

   public static void main(String[] args) {
      SpringApplication.run(ReportApplication.class, args);
   }
}