随着Spring Cloud Alibaba一整套微服务解决方案越发成熟，使用它做企业业务应用落地的公司也越来越多，目前最新版本是2020年4月10日的2.2.1.RELEASE，OK，让我们进入主题。
官网网址——https://spring.io/projects/spring-cloud-alibaba#overview
What is Spring Cloud Alibaba?
Spring Cloud Alibaba provides a one-stop solution for distributed application development. It contains all the components required to develop distributed applications, making it easy for you to develop your applications using Spring Cloud.
With Spring Cloud Alibaba, you only need to add some annotations and a small amount of configurations to connect Spring Cloud applications to the distributed solutions of Alibaba, and build a distributed application system with Alibaba middleware.
Spring Cloud Alibaba 为微服务开发提供了一站式解决方案。它包含了开发分布式应用微服务的必需组件，方便您通过 Spring Cloud 框架来开发分布式应用服务。
借助 Spring Cloud Alibaba，您只需要添加一些注解和少量配置，就可以将 Spring Cloud 应用接入Alibaba微服务解决方案，通过Alibaba中间件来迅速搭建分布式应用系统。
Features
Flow control and service degradation：Flow control for HTTP services is supported by default. You can also customize flow control and service degradation rules using annotations. The rules can be changed dynamically.流量控制和服务降级：默认支持HTTP服务的流量控制，您也可以通过注解自定义流量控制和服务降级规则。这些规则可以被动态地设置改变。
Service registration and discovery：Service can be registered and clients can discover the instances using Spring-managed beans, auto integration Ribbon.服务注册与发现：服务可以注册，客户可以使用Spring管理的Bean发现实例，自动整合Ribbon。
Distributed configuration：support for externalized configuration in a distributed system, auto refresh when configuration changes.分布式配置管理：支持分布式系统中的外部化配置，配置更改时自动刷新。
Event-driven：support for building highly scalable event-driven microservices connected with shared messaging systems.消息驱动:支持构建和共享消息系统连接的高度可扩展的事件驱动微服务。
Distributed Transaction：support for distributed transaction solution with high performance and ease of use.分布式事务：支持分布式事务解决方案，性能高并且使用方便。
Alibaba Cloud Object Storage：massive, secure, low-cost, and highly reliable cloud storage services. Support for storing and accessing any type of data in any application, anytime, anywhere.Alibaba Cloud对象存储：海量的、安全的、低成本的、高可靠的云存储服务。支持在任何应用、任何时间、任何地点存储和访问任意类型的数据。
Alibaba Cloud SchedulerX：accurate, highly reliable, and highly available scheduled job scheduling services with response time within seconds.分布式任务调度：提供秒级、精准、高可靠、高可用的定时（基于 Cron 表达式）任务调度服务。Alibaba Cloud SMS： A messaging service that covers the globe, Alibaba SMS provides convenient, efficient, and intelligent communication capabilities that help businesses quickly contact their customers.阿里云短信服务：覆盖全球的短信服务， Alibaba SMS提供了友好、高效和智能的互联化通讯能力，帮助企业快速地搭建客户触达通道。
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