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spring多线程

作者:互联网

Spring4.x高级话题(二):多线程

. 点睛

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。而实际开发中任务一般是非阻碍的,即异步的,所以我们要在配置类中通过@EnableAsync开启对异步任务的支持,并通过在实际执行的Bean的方法中使用@Async注解来声明其是一个异步任务。

. 示例

1. 配置类

package org.light4j.sping4.senior.taskExecutor;

 

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.concurrent.ThreadPoolTaskExecutor;

@Configuration

@ComponentScan("org.light4j.sping4.senior.taskExecutor")

@EnableAsync //①

public class TaskExecutorConfig implements AsyncConfigurer{//②

 

    @Override

    public Executor getAsyncExecutor() {//②

        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();

            taskExecutor.setCorePoolSize(5);

            taskExecutor.setMaxPoolSize(10);

            taskExecutor.setQueueCapacity(25);

            taskExecutor.initialize();

            return taskExecutor;

    }

 

    @Override

    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {

        return null;

    }

 

}

代码解释:

① 利用@EnableAsync注解开启异步任务支持。
② 配置类实现AsyncConfigurer接口并重写getAsyncExecutor方法,并返回ThreadPoolTaskExecutor ,这样就获得了一个基于线程池的TaskExecutor。

2. 任务执行类

package org.light4j.sping4.senior.taskExecutor;

 

import org.springframework.scheduling.annotation.Async;

import org.springframework.stereotype.Service;

@Service

public class AsyncTaskService {

 

    @Async //①

    public void executeAsyncTask(Integer i){

        System.out.println("执行异步任务: "+i);

    }

 

    @Async

    public void executeAsyncTaskPlus(Integer i){

        System.out.println("执行异步任务+1: "+(i+1));

    }

}

代码解释:

① 通过@Async注解表明该方法是个异步方法,如果注解在类级别,则表明该类所有的方法都是异步方法,而这里的方法自动被注入使用ThreadPoolTaskExecutor作为TaskExecutor。

3. 运行

package org.light4j.sping4.senior.taskExecutor;

 

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

 

public class Main {

 

    public static void main(String[] args) {

         AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(TaskExecutorConfig.class);

 

         AsyncTaskService asyncTaskService = context.getBean(AsyncTaskService.class);

 

         for(int i =0 ;i<10;i++){

             asyncTaskService.executeAsyncTask(i);

             asyncTaskService.executeAsyncTaskPlus(i);

            }

            context.close();

    }

}

输出结果表明是并发执行而不是顺序执行的,
运行结果如下图所示:

4. 源代码示例:

github地址:点击查看
码云地址:点击查看

 

标签:异步,spring,springframework,org,taskExecutor,import,多线程,public
来源: https://www.cnblogs.com/wangchaonan/p/10731522.html