Spring Boot 知识笔记（定时任务与异步）

@SpringBootApplication    //@SpringBootApplication = @Configuration+@EnableAutoConfiguration+@ComponentScan
@Configuration
@ServletComponentScan  //扫描过滤器等servlet、filter注解
@MapperScan("net.Eleven.demo.Mapper") //扫描对应的Mapper文件

@EnableScheduling   //定时任务注解，扫描包里面所有子类中的定时任务
@EnableAsync  //开启异步任务
public class XdclassApplication extendsSpringBootServletInitializer {
    @Override
    protectedSpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(XdclassApplication.class);
    }
    public static voidmain(String[] args){
        SpringApplication.run(XdclassApplication.class,args);
    }
}

packagenet.Eleven.demo.task;
importorg.springframework.scheduling.annotation.Scheduled;
importorg.springframework.stereotype.Component;
importjava.util.Date;
/**
 * 功能描述：定时任务业务类
 *
 */
@Component
public classTestTask {
//@Scheduled(fixedRate = 2000)  //每两秒执行一次
    @Scheduled(cron = "*/3 * * * * *") //每三秒执行一次
    public voidsendEmail(){
        System.out.println("当前时间："+newDate());
    }
}

packagenet.Eleven.demo.task;
importorg.springframework.scheduling.annotation.Async;
importorg.springframework.stereotype.Component;
@Component
@Async  //类中所有的方法都是异步
public classAsyncTask {
    @Async //被标注的方法是异步
    public void task1() throwsInterruptedException{
        long begin =System.currentTimeMillis();
        Thread.sleep(1000L);
        long end =System.currentTimeMillis();
        System.out.println("任务1耗时："+(end-begin));
    }
    public void task2() throwsInterruptedException{
        long begin =System.currentTimeMillis();
        Thread.sleep(2000L);
        long end =System.currentTimeMillis();
        System.out.println("任务2耗时："+(end-begin));
    }
    public void task3() throwsInterruptedException{
        long begin =System.currentTimeMillis();
        Thread.sleep(3000L);
        long end =System.currentTimeMillis();
        System.out.println("任务3耗时："+(end-begin));
    }
}

@Autowired
    privateAsyncTask  asyncTask;
    @GetMapping("/api/async")
    public JsonData doTask() throwsInterruptedException{
        long begin =System.currentTimeMillis();
        asyncTask.task1();
        asyncTask.task2();
        asyncTask.task3();
        long end =System.currentTimeMillis();
        long totalTime = end-begin;
        System.out.println("执行耗时："+totalTime);
        returnJsonData.buildSuccess(totalTime);
    }