本篇主要描述一下spring的多线程的使用与定时任务的使用.

1.spring多线程任务的使用

spring通过任务执行器TaskExecutor来实现多线程与并发编程。通常使用ThreadPoolTaskExecutor来实现一个基于线程池的TaskExecutor.

首先你要实现AsyncConfigurer 这个接口，目的是开启一个线程池

代码如下:

package com.foreveross.service.weixin.test.thread;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;/** * 注入一个线程池 * @author mingge * */@Configuration@ComponentScan("com.foreveross.service.weixin.test.thread")@EnableAsyncpublic class TaskExecutorConfig implements AsyncConfigurer {    @Override    public Executor getAsyncExecutor() {        ThreadPoolTaskExecutor taskExecutor=new ThreadPoolTaskExecutor();        taskExecutor.setCorePoolSize(5);        taskExecutor.setMaxPoolSize(20);        taskExecutor.setQueueCapacity(25);        taskExecutor.initialize();        return taskExecutor;    }    @Override    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {        return null;    }    }

 

然后注入一个类，实现你的业务，并在你的Bean的方法中使用@Async注解来声明其是一个异步任务

代码如下:

package com.foreveross.service.weixin.test.thread;import org.springframework.scheduling.annotation.Async;import org.springframework.stereotype.Service;/** * 线程池任务 * @author mingge * */@Servicepublic class TaskService {    @Async    public void executeAsyncTask(int i){        System.out.println("执行异步任务:"+i);    }        @Async    public void executeAsyncTask1(int i){        System.out.println("执行异步任务1:"+(i+i));    }}

最后通过测试，可以看到你的实现是异步执行了.

package com.foreveross.service.weixin.test.thread;import org.springframework.context.annotation.AnnotationConfigApplicationContext;/** *  * @author mingge * */public class Test {    public static void main(String[] args) {        AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext(TaskExecutorConfig.class);        TaskService taskService=context.getBean(TaskService.class);        for(int i=0;i<20;i++){            taskService.executeAsyncTask(i);            taskService.executeAsyncTask1(i);        }        //最后可以根据结果可以看出结果是并发执行而不是顺序执行的呢        context.close();    }}

 

1.spring定时任务的使用

在java原生态中，我们使用timer就可以了，这里小编说一些在Spring中的定时任务的使用

package com.foreveross.service.weixin.test.thread;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.annotation.EnableScheduling;@Configuration@ComponentScan("com.foreveross.service.weixin.test.thread")@EnableScheduling//开启对定时器的支持public class TaskSchedulerConfig {}

package com.foreveross.service.weixin.test.thread;import java.util.Date;import org.springframework.scheduling.annotation.Scheduled;import org.springframework.stereotype.Service;@Servicepublic class TimerTaskJob {    @Scheduled(fixedRate=2000)    public void test(){        System.out.println("我是定时任务:"+new Date().getSeconds());    }}

 

package com.foreveross.service.weixin.test.thread;import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class TestTimer {    public static void main(String[] args) {        AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext(TaskSchedulerConfig.class);                //context.close();    }}

 

记一下总结，或许以后有用...

 

每天进步一点点...