spring多线程
作者:互联网
一. 点睛
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TaskExecutor。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的方法中使用@Async注解来声明其是一个异步任务。
二. 示例
1. 配置类
package org.light4j.sping4.senior.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("org.light4j.sping4.senior.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ThreadPoolTaskExecutor ,这样就获得了一个基于线程池的TaskExecutor。
2. 任务执行类
package org.light4j.sping4.senior.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。
3. 运行
package org.light4j.sping4.senior.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();
}
}
输出结果表明是并发执行而不是顺序执行的,
运行结果如下图所示:
4. 源代码示例:
标签:异步,spring,springframework,org,taskExecutor,import,多线程,public 来源: https://www.cnblogs.com/wangchaonan/p/10731522.html