spring多线程与定时任务

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")
@EnableAsync
public 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
 *
 */
@Service
public 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;

@Service
public 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...