首先，有这样一个异步监听方法

然后配置好了异步线程池 

package com.fdw.study.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import java.util.concurrent.ThreadPoolExecutor;@ComponentScan(basePackages = {"com.fdw.study.event", "com.fdw.study.eventListener"})
@Configuration
public class EventConfig {//自定义线程池@Beanpublic ThreadPoolTaskExecutor asyncThreadPoolExecutor() {ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();// 核心线程数taskExecutor.setCorePoolSize(4);// 线程池维护线程的最大数量，只有在缓冲队列满了之后才会申请超过核心线程数的线程taskExecutor.setMaxPoolSize(20);// 缓存队列taskExecutor.setQueueCapacity(50);// 空闲时间，当超过了核心线程数之外的线程在空闲时间到达之后会被销毁taskExecutor.setKeepAliveSeconds(200);// 异步方法内部线程名称taskExecutor.setThreadNamePrefix("fdw-async-executor-");/*** 当线程池的任务缓存队列已满并且线程池中的线程数目达到maximumPoolSize，如果还有任务到来就会采取任务拒绝策略* 通常有以下四种策略：* ThreadPoolExecutor.AbortPolicy:丢弃任务，抛出RejectedExecutionException异常。* ThreadPoolExecutor.DiscardPolicy：丢弃任务，但不抛出异常。* ThreadPoolExecutor.DiscardOldestPolicy：丢弃队列最前面的任务，然后重新尝试重新执行任务。* ThreadPoolExecutor.CallerRunsPolicy：重试添加当前的任务，自动重复调用 execute() 方法，直到成功。*/taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());taskExecutor.initialize();return taskExecutor;}}

执行测试

package com.fdw.study.test;import com.fdw.study.config.EventConfig;
import com.fdw.study.event.UserChangePasswordEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class EventTest {public static void main(String[] args) {ApplicationContext context = new AnnotationConfigApplicationContext(EventConfig.class);context.publishEvent(new UserChangePasswordEvent("145623"));}
}

 发现还是走的main线程，没有实现异步

原因：后来发现是配置类缺少了@EnableAsync注解，加上后再测试

现在才是真的异步