Spring通过任务执行器（TaskExecutor）来实现多线程和并发编程。使用ThreadPoolTaskExecutor可实现一个基于线程池的TaskExecutor.在开发中实现异步任务，我们可以在配置类中添加@EnableAsync开始对异步任务的支持，并在相应的方法中使用@Async注解来声明一个异步任务。

配置类

package com.xingguo.logistics.controller;import java.util.concurrent.Executor;import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.annotation.AsyncConfigurer;import org.springframework.scheduling.annotation.EnableAsync;import org.springframework.scheduling.annotation.EnableScheduling;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;@Configuration@ComponentScan({
    "com.xingguo.logistics.service.aspect","com.xingguo.logistics.service.event"})//开始异步支持@EnableAsyncpublic class AopConfig implements AsyncConfigurer{
         @Override    public Executor getAsyncExecutor() {         //线程池        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();        taskExecutor.setCorePoolSize(5);        taskExecutor.setMaxPoolSize(10);        taskExecutor.setQueueCapacity(25);        taskExecutor.initialize();        return taskExecutor;    }    @Override    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {         return null;    }}

任务执行service类

package com.xingguo.logistics.service.aspect;import org.springframework.scheduling.annotation.Async;import org.springframework.stereotype.Service;@Servicepublic class TestService2 {
         //声明异步任务    @Async    public void executeAsyncTask(Integer i){         System.out.println("执行异步任务:"+i);    }    @Async    public void executeAsyncTask2(Integer i){         System.out.println("执行异步任务2:"+i);    }}<

测试类

package com.xingguo.logistics.controller;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import com.xingguo.logistics.service.aspect.TestService2;public class TestController {public static void main(String[] args) {    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AopConfig.class);    TestService2 testService2 = context.getBean(TestService2.class);    for(int i = 0; i<10; i++){
             testService2.executeAsyncTask(i);        testService2.executeAsyncTask2(i);    }    context.close();    }}

测试结果如下：

执行结果可以看出，并没有按照顺序来执行。