当前一个请求结果是后一个请求的参数时，在Handler是进行逻辑处理：

 public Flux<Integer> responseDepartmentListByHospitalId(Integer id){
      return  this.middleOfDepartmentRepository.findById(id);
    }

    public Flux<Departments> findDepartmentByHospitalId(Collection<Integer> lists){
        return this.departmentsRepository.findByIdIn(lists);
    }

public Mono<ServerResponse> getDepartmentsByHospitalId(ServerRequest request){
        Integer id = Integer.valueOf(request.pathVariable("id"));
        return this.commonService.responseDepartmentListByHospitalId(id)
                .collectList()
                .flatMap(list ->  ServerResponse.ok().contentType(MediaType.APPLICATION_JSON)
                        .body(commonService.findDepartmentByHospitalId(list), Departments.class));
    }