SpringBoot

       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

@SpringBootApplication
public class KeerApplication {

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

}

@SpringBootConfiguration		//springboot的配置
		@Configuration					//spring配置
				@Component					//spring组件 
@EnableAutoConfiguration		//自动配置
		@AutoConfigurationPackage		//自动配置包
				@Import({Registrar.class})		//自动配置‘包注册’
		@Import({AutoConfigurationImportSelector.class})	//自动配置导入选择
				List<String> configurations = this.getCandidateConfigurations(annotationMetadata, attributes);

@EnableAsync	//开启异步注解

@Async		//异步注解

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

@Autowired
JavaMailSenderImpl mailSender;

//简单邮件
SimpleMailMessage mailMessage = new SimpleMailMessage();
mailMessage.setSubject("title");
mailMessage.setText("text");
mailMessage.setTo("xx@mail.com");
mailMessage.setFrom("xx@mail.com");
mailSender.send(mailMessage);

TaskScheduler	//任务调度
TaskExecutor //任务执行
  
@EnableScheduling		//开启定时功能的注解
@Scheduled					//什么时候执行
  
cron //表达式