spring异步多线程

淩亂°似流年 2021-11-09 03:46 413阅读 0赞

### spring异步多线程 ###

*  配置对异步任务的支持
 *  异步任务类
 *  测试类

# 配置对异步任务的支持 #

spring通过任务执行器`TaskExecutor`来实现多线程和并发编程。  
使用`ThreadPoolTaskExecutor`可以实现一个基于线程池的`TaskExecutor`

package com.sky.springtest.config;
    
    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.sky.springtest"})
    //开启异步
    @EnableAsync
    public class TaskExecutorConfig implements AsyncConfigurer { 
    	@Override
    	public Executor getAsyncExecutor() { 
    		//线程任务池
    		ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
    		taskExecutor.setCorePoolSize(5);
    		taskExecutor.setMaxPoolSize(10);
    		taskExecutor.setQueueCapacity(25);
    		taskExecutor.initialize();
    		return taskExecutor;
    	}
    	@Override
    	public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() { 
    		System.err.println("getAsyncUncaughtExceptionHandler.....");
    		return null;
    	}
    }

# 异步任务类 #

package com.sky.springtest.service;
    import org.springframework.scheduling.annotation.Async;
    import org.springframework.stereotype.Service;
    
    @Service
    public class AsyncTaskService { 
    	@Async
    	public void executeAsyncTask(Integer i) { 
    		System.err.println("执行异步任务：" + i + " " + 100 / i);
    	}
    	@Async
    	public void executeAsyncTask2(Integer i) { 
    		System.err.println("------------执行异步任务2：" + i + " " + 100 / i);
    	}
    }

# 测试类 #

package com.sky.springtest.config;
    import org.junit.BeforeClass;
    import org.junit.Test;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    import com.sky.springtest.service.AsyncTaskService;
    
    public class TaskExecutorConfigTest { 
    	private static AnnotationConfigApplicationContext context = null;
    	@BeforeClass
    	public static void beforeClass() { 
    		context = new AnnotationConfigApplicationContext(TaskExecutorConfig.class);
    	}
    	@Test
    	public void test() { 
    		AsyncTaskService taskService = context.getBean(AsyncTaskService.class);
    		for (int i = 0; i < 10; i++) { 
    			taskService.executeAsyncTask(i);
    			taskService.executeAsyncTask2(i);
    		}
    		// 防止主进程立即运行完毕，延迟10秒退出主进程
    		try { 
    			Thread.sleep(50);
    		} catch (InterruptedException e) { 
    		}
    		context.close();
    	}
    }
    /*打印结果： 执行异步任务：2 50 执行异步任务：1 100 ------------执行异步任务2：2 50 ------------执行异步任务2：1 100 ------------执行异步任务2：3 33 执行异步任务：3 33 执行异步任务：5 20 ------------执行异步任务2：4 25 执行异步任务：4 25 ------------执行异步任务2：6 16 执行异步任务：6 16 ------------执行异步任务2：5 20 ------------执行异步任务2：7 14 ------------执行异步任务2：8 12 执行异步任务：9 11 ------------执行异步任务2：9 11 执行异步任务：7 14 执行异步任务：8 12 [04 20:42:28,975 ERROR] [ThreadPoolTaskExecutor-1] interceptor.SimpleAsyncUncaughtExceptionHandler - Unexpected error occurred invoking async method: public void com.sky.springtest.service.AsyncTaskService.executeAsyncTask(java.lang.Integer) java.lang.ArithmeticException: / by zero */

0不能做除数，程序抛出异常