Spring多线程
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Spring是通过TaskExecutor任务执行器来实现多线程和并发编程的。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。
实例代码:
(1)配置类
package com.lwh.highlight_spring4.ch3.taskexecutor; /** * Created by luwenhu on 2017/9/20. */ 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; import java.util.concurrent.Executor; /** * Spring是通过TaskExecutor任务执行器来实现多线程和并发编程的。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 */ @Configuration @ComponentScan("com.lwh.highlight_spring4.ch3.taskexecutor") @EnableAsync//开启异步任务支持 public class TaskExecutorConfig implements AsyncConfigurer{ /** * 实现AsyncConfigurer并重写getAsyncExecutor方法返回一个ThreadPoolTaskExecutor * @return */ @Override public Executor getAsyncExecutor() { ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor(); threadPoolTaskExecutor.setMaxPoolSize(10); threadPoolTaskExecutor.setCorePoolSize(5); threadPoolTaskExecutor.setQueueCapacity(25); threadPoolTaskExecutor.initialize(); return threadPoolTaskExecutor; } @Override public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() { return null; } }
(2)任务执行类
package com.lwh.highlight_spring4.ch3.taskexecutor; import org.springframework.scheduling.annotation.Async; import org.springframework.stereotype.Service; /** * Created by luwenhu on 2017/9/20. */ @Service public class AsyncTaskService { @Async//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 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)); } }
(3)运行类
package com.lwh.highlight_spring4.ch3.taskexecutor; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * Created by luwenhu on 2017/9/20. */ 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(); } }
运行结果:
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