spring 实现多线程

spring 通过任务执行器（TaskExecutor）来实现多线程和并发编程。使用ThreadPoolTaskExecutor可实现一个基于线程池的TaskExecutor。实际开发中任务一般是异步的。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。

配置类：

@Configuration
@EnableAsync
@ComponentScan("com.hong.stu.service")
public class TaskExcutorConfig implements AsyncConfigurer {
    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(5);
        taskExecutor.setMaxPoolSize(10);
        taskExecutor.setQueueCapacity(25);
        taskExecutor.initialize();
        return taskExecutor;
    }
}

任务执行类：

@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 + 1));
    }
}

运行：

public class AsyncMain {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(TaskExcutorConfig.class);
        AsyncTaskService asyncTaskService = context.getBean(AsyncTaskService.class);
        for (int i = 0; i < 10; i++) {
            asyncTaskService.executeAsyncTask(i);
            asyncTaskService.executeAsyncTaskPlus(i);
        }
        context.close();
    }
}