Spring 之多线程

    Spring 通过任务执行器 TaskExecutor  来实现多线程和并发编程, 使用 ThreaPoolTaskExector  可实现一个基于线程池的 TaskExecutor. 而实际开发任务一般非阻碍的,即异步.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 注解来声明是一个异步任务.

配置类:

package com.pangu.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;

/**
 * @ClassName: TaskExecutorConfig
 * @Description: TODO 配置类
 * @author etfox
 * @date 2018年9月11日 下午8:52:29
 *
 * @Copyright: 2018 www.etfox.com Inc. All rights reserved.
 */
@Configuration
@ComponentScan("com.pangu.taskexecutor")
@EnableAsync //注解开启异步任务支持
//配置类实现 AsyncConfigurer 接口并重写 getAsyncExecutor 方法,并返回一个 ThreadPoolTaskExecutor
public class TaskExecutorConfig implements AsyncConfigurer {

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(5);
        taskExecutor.setMaxPoolSize(10);
        taskExecutor.setQueueCapacity(25);
        taskExecutor.initialize();
        return taskExecutor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return null;
    }

}

业务类:

package com.pangu.taskexecutor;

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

/**
 * @ClassName: AsyncTaskService
 * @Description: TODO 任务执行类
 * @author etfox
 * @date 2018年9月11日 下午9:04:18
 *
 * @Copyright: 2018 www.etfox.com Inc. All rights reserved.
 */
@Service
public class AsyncTaskService {
    
    @Async //注解表名方法是异步方法,如果在类上,则表明整个类的方法都是异步方法
    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));
    }
    
}

测试类:

package com.pangu.taskexecutor;

import org.junit.Test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class TestMain {

    @Test
    public void test(){
        AnnotationConfigApplicationContext application = 
                new AnnotationConfigApplicationContext(TaskExecutorConfig.class);
        
        AsyncTaskService ayAsyncTaskExecutor = application.getBean(AsyncTaskService.class);
        for (int i = 0; i < 10; i++) {
            ayAsyncTaskExecutor.executeAsyncTask(i);
            ayAsyncTaskExecutor.executeAsyncTaskPlus(i);
        }
        
        application.close();
    }
    
}

执行结果:

九月 11, 2018 11:09:34 下午 org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@7637f22: startup date [Tue Sep 11 23:09:34 CST 2018]; root of context hierarchy
九月 11, 2018 11:09:34 下午 org.springframework.context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker postProcessAfterInitialization
信息: Bean 'taskExecutorConfig' of type [com.pangu.taskexecutor.TaskExecutorConfig$$EnhancerBySpringCGLIB$$477743c1] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
九月 11, 2018 11:09:34 下午 org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor initialize
信息: Initializing ExecutorService 
执行异步任务+1:1
执行异步任务2
执行异步任务+1:3
执行异步任务1
执行异步任务0
执行异步任务+1:2
执行异步任务+1:5
执行异步任务4
执行异步任务+1:4
执行异步任务+1:7
执行异步任务3
执行异步任务7
执行异步任务6
执行异步任务+1:6
执行异步任务5
执行异步任务9
执行异步任务+1:9
执行异步任务8
执行异步任务+1:8
执行异步任务+1:10
九月 11, 2018 11:09:34 下午 org.springframework.context.annotation.AnnotationConfigApplicationContext doClose
信息: Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@7637f22: startup date [Tue Sep 11 23:09:34 CST 2018]; root of context hierarchy