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Spring Boot教程10——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TaskExcutor。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开启对异步任务的支持,并通过在实际执行的Bean的方法中通过使用@Async注解来声明其是一个异步任务。

示例

1>.配置类

package com.wisely.highlight_spring4.ch3.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.wisely.highlight_spring4.ch3.taskexecutor")@EnableAsync //开启异步任务支持 public class TaskExecutorConfig implements AsyncConfigurer{//实现AsyncConfigurer接口    @Override    public Executor getAsyncExecutor() {//实现AsyncConfigurer接口并重写getAsyncExecutor方法,并返回一个ThreadPoolTaskExecutor,这样我们就获得了一个基于线程池TaskExecutor         ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();            taskExecutor.setCorePoolSize(5);            taskExecutor.setMaxPoolSize(10);            taskExecutor.setQueueCapacity(25);            taskExecutor.initialize();            return taskExecutor;    }    @Override    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {        return null;    }}

 

2>.任务执行类
package com.wisely.highlight_spring4.ch3.taskexecutor;import org.springframework.scheduling.annotation.Async;import org.springframework.stereotype.Service;@Servicepublic class AsyncTaskService {        @Async //通过@Async注解表明该方法是一个异步方法,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

package com.wisely.highlight_spring4.ch3.taskexecutor;import org.springframework.context.annotation.AnnotationConfigApplicationContext;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();    }}

 

结果是并发执行而不是顺序执行的。

Spring Boot教程10——多线程