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Spring任务执行器(TaskExecutor)
Spring通州任务执行器(TaskExecutor)来实现多线程和并发编程,使用ThreadPoolTaskExecutor
可实现一个基于线程的TaskExecutor,而实际开发中任务一般是非阻塞的,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的方法中使用@Async注解来声明其是一个异步任务。
实例
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 //1
public class TaskExecutorConfig implements AsyncConfigurer{//2
@Override
public Executor getAsyncExecutor() {//2
ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(5);
taskExecutor.setMaxPoolSize(10);
taskExecutor.setQueueCapacity(25);
taskExecutor.initialize();
return taskExecutor;
}
@Override
public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
return null;
}
}
代码解释
1.利用@EnableAsync注解开启异步任务支持。
2.配置类实现AsyncConfigurer接口并重写getAsyncExecutor方法,并返回一个ThreadPoolTaskExecutor,这样我们就获得了已个基于线程池TaskExecutor.
任务执行类
package com.wisely.highlight_spring4.ch3.taskexecutor;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
@Service
public class AsyncTaskService {
@Async //1
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));
}
}
代码解释
1.通过@Async注解表明该方法是个异步方法,如果注解在类级别,则表明该类所以的方法都是异步的,
而这里的方法自动被注入使用ThreadPoolTaskExecutor作为TaskExecutor。
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。
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原文地址:http://www.cnblogs.com/faunjoe88/p/5677685.html