加上@Cacheable(value = {"emps"}注解后就会报错

就是下面这段代码我不加Cacheable缓存注解就可以查询加上就报错java.net.ConnectException: Connection refused: connect。这是咋回事呢

@Service
public class Employeemapper {

@Autowired
EmployeeMapper employeemapper;

@Cacheable(value = {"emps"})
public Employee employe(Integer id){

    System.out.println("woaini");
    Employee emp = employeemapper.getEmpById(id);

    return  emp;
}

}

这是链接错误啊，你用的redis做缓存吗？redis启动了吗？