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();
}
}
2.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();
}
}
