@MapperScan({"com.test.**.mapper", "com.test.**.dao"})
@EnableAsync
@EnableDiscoveryClient
@EnableEurekaClient
@EnableFeignClients
@EnableTransactionManagement
@EnableScheduling
@EnableCaching
@ComponentScan(value = {"com.test"})
@EnableHystrix
@EnableHystrixDashboard
@SpringBootApplication
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@MapperScan({"com.test.**.mapper", "com.test.**.dao"})
开启映射文件的扫描，对应的映射文件@Mapper可加可不加。
@Mapper注解加在映射接口上，会对应生成代理对象。但是每个都写很繁琐。@MapperScan应运而生，通过路径自动扫描，根据包下的类生成对应代理对象，实现与数据库的交互。
@EnableAsync
开启支持异步执行，既开启多线程。只有标注这个注释，@Async注解才能够生效。
@EnableDiscoveryClient
将服务注册到注册中心
@EnableEurekaClient
将服务注册到Eureka注册中心
@EnableFeignClients
@EnableTransactionManagement
@EnableScheduling
@EnableCaching
@ComponentScan(value = {"com.test"})
@EnableHystrix
@EnableHystrixDashboard
@SpringBootApplication
@EnableScheduling
@EnableCaching
@ComponentScan(value = {"com.test"})
@EnableHystrix
@EnableHystrixDashboard
@SpringBootApplication