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();
}
}