spring学习--9 多任务

spring采用TaskExecutor完成多任务处理工作和并发编程，可以使用TheadPoolTaskExecutor创建一个基于线程池的TaskExecutor。如下例所示。

1、Configuration类

package com.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("com.taskexecutor")
// 注解与接口AsyncConfigurer或AsyncConfigurerSupport配合使用，形成支持异步的配置
@EnableAsync 
public class TaskExecutorConfig implements AsyncConfigurer {

    @Override
    public Executor getAsyncExecutor() {
        // 创建基于线程池的任务执行器，该任务执行器的参数需要进行合理设置。
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(60);
        taskExecutor.setMaxPoolSize(100);
        taskExecutor.setQueueCapacity(2500);
        taskExecutor.initialize();
        return taskExecutor;
    }

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

}

2. 任务类(相当于Java中的Runnable 类或Thread 类)

package com.taskexecutor;

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

@Service
public class AsyncTaskService {
    @Async // 
    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));
    }
}

3.测试类

package com.taskexecutor;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Bootrap {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = 
                new AnnotationConfigApplicationContext(TaskExecutorConfig.class);

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

        for (int i = 0; i < 100; i++) {
            // 每个execute方法代表一个并行的异步任务
            taskService.executeAsyncTask(i);
            taskService.executeAsyncTaskPlus(i);
        }

        context.close();
    }
}