Spring多线程之TaskExecutor

痛定思痛。 2022-05-16 01:49 953阅读 0赞

> 一般来说，任务执行都是同步的、
> 
> Spring通过TaskExecutor来实现多线程，异步执行，通过注解@EnableAsync来开启异步任务执行的支持

下面进行测试：

## 一、新建一个maven项目，并导入spring的包 ##

<dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-context</artifactId>
       <version>4.2.3.RELEASE</version>
    </dependency>

## 二、创建自己的配置类，实现AsyncConfigurer接口 ##

package cn.van.taskExcutor;
    
    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.concurrent.ThreadPoolTaskExecutor;
    
    import java.util.concurrent.Executor;
    
    @Configuration
    @ComponentScan("cn.van.taskExcutor")
    @EnableAsync //开启对异步任务的支持
    public class TaskExecutorConfig implements AsyncConfigurer {
        @Override
        public Executor getAsyncExecutor() {
            ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
            taskExecutor.setCorePoolSize(5);//线程池维护线程的最少数量
            taskExecutor.setMaxPoolSize(10);//线程池维护线程的最大数量
            taskExecutor.setQueueCapacity(25);//缓冲队列的数量
            taskExecutor.initialize();//初始化
            return taskExecutor;
        }
    
        @Override
        public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
            return null;
        }
    }

## 三、创建自己的任务类     ##

package cn.van.taskExcutor;
    
    import org.springframework.scheduling.annotation.Async;
    import org.springframework.stereotype.Service;
    
    @Service
    @Async //放在类上，表明该类中所有方法都是异步执行
    public class AsyncTaskService {
    
        public void executeAysncTask1(Integer i){
            System.out.println("executeAysncTask1: " + i);
        }
    
        public void executeAysncTask2(Integer i){
            System.out.println("executeAysncTask2: " + i);
        }
    }

## 四、测试 ##

package cn.van.taskExcutor;
    
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    public class TaskExecutor {
        public static void main(String[] args) {
            AnnotationConfigApplicationContext application
                    = new AnnotationConfigApplicationContext(TaskExecutorConfig.class);
            AsyncTaskService service = application.getBean(AsyncTaskService.class);
            for(int i=0;i<10;i++){
                service.executeAysncTask1(i);
                service.executeAysncTask2(i+1);
            }
            application.close();
        }
    }

![70][]

如果是同步执行，那同一个task, 得出的数是比前一个大1的。

这里并没有体现，因为是异步执行。

[70]: /images/20220516/f1b5256cec5b443f8244be62a4121327.png