随笔：@Async注解

记录@Async使用方法以及遇到的问题

1.在启动类使用@EnableAsync

@SpringBootApplication
@EnableAsync
public class AsyncApplication {

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

}

2.在想要异步的方法类上标注@Async

@Override
    @Async
    public void test1() {
        //无返回值
    }

    @Override
    @Async
    public Future test2() {
    	//有返回值
        return null;
    }

3.介绍线程池

package com.test.async;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;


@SpringBootApplication
@EnableAsync
public class AsyncApplication {

	public static void main(String[] args) {
		SpringApplication.run(AsyncApplication.class, args);
	}
	
	@Configuration
    class TaskPoolConfig {
        @Bean("asyncExecutor")
        public Executor asyncExecutor() {
            ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
            executor.setCorePoolSize(10);
            executor.setMaxPoolSize(20);
            executor.setQueueCapacity(200);
            executor.setKeepAliveSeconds(60);
            executor.setThreadNamePrefix("asyncExecutor-");
            executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
            executor.initialize();
            return executor;
        }
    }
}