1.修改Spring Boot 主類




@SpringBootApplication
@EnableAsync        //開啟非同步任務
public class Application {
    @Bean(name="processExecutor")
    public TaskExecutor workExecutor() {
        ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
        threadPoolTaskExecutor.setThreadNamePrefix("Async-");
        threadPoolTaskExecutor.setCorePoolSize(10);
        threadPoolTaskExecutor.setMaxPoolSize(20);
        threadPoolTaskExecutor.setQueueCapacity(600);
        threadPoolTaskExecutor.afterPropertiesSet();
        return threadPoolTaskExecutor;
    }




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








2.定義非同步類




@Component
public class AsyncTask {
    
    @Async("processExecutor")
    public void start() {
        double random = Math.random();
        int sleepInt = (int) (random  * 2000);
        try {
            Thread.sleep(sleepInt);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }




}








3.使用：


在其他類中：




@Component
public class User {
    @Autowired
    private AsyncTask asyncTask;

asyncTask.start();
asyncTask.start();
asyncTask.start();

}

注意：ThreadPoolTaskExecutor 的使用非常重要，之前沒有配置它導致@Async無效