spring-boot 方法异步调用，自定义线程池配置使用

一、在主类中添加@EnableAsync注解：

@SpringBootApplication
@EnableScheduling
@EnableAsync
public class MySpringBootApplication {
	private static Logger logger = LoggerFactory.getLogger(MySpringBootApplication.class);
	
	public static void main(String[] args) {
		SpringApplication.run(MySpringBootApplication.class, args);
		logger.info("My Spring Boot Application Started");
	}

二、建立一个AsyncTask类，在里面添加两个用@Async注解的task：

@Component
public class AsyncTask {
	protected final Logger logger = LoggerFactory.getLogger(this.getClass());
	
	@Async
	public Future<String> doTask1() throws InterruptedException{
		logger.info("Task1 started.");
		long start = System.currentTimeMillis();
        Thread.sleep(5000);
        long end = System.currentTimeMillis();
        
        logger.info("Task1 finished, time elapsed: {} ms.", end-start);
        
        return new AsyncResult<>("Task1 accomplished!");
	}
	
	@Async
	public Future<String> doTask2() throws InterruptedException{
		logger.info("Task2 started.");
		long start = System.currentTimeMillis();
        Thread.sleep(3000);
        long end = System.currentTimeMillis();
        
        logger.info("Task2 finished, time elapsed: {} ms.", end-start);
        
        return new AsyncResult<>("Task2 accomplished!");
	}
}

三、万事俱备，开始测试：

public class TaskTests extends BasicUtClass{
	@Autowired
	private AsyncTask asyncTask;
	
	
	@Test
	public void AsyncTaskTest() throws InterruptedException, ExecutionException {
		Future<String> task1 = asyncTask.doTask1();
		Future<String> task2 = asyncTask.doTask2();
		
		while(true) {
			if(task1.isDone() && task2.isDone()) {
				logger.info("Task1 result: {}", task1.get());
				logger.info("Task2 result: {}", task2.get());
				break;
			}
			Thread.sleep(1000);
		}
		
		logger.info("All tasks finished.");
	}
}

测试结果：

2016-12-13 11:12:24,850:INFO main (AsyncExecutionAspectSupport.java:245) - No TaskExecutor bean found for async processing
2016-12-13 11:12:24,864:INFO SimpleAsyncTaskExecutor-1 (AsyncTask.java:22) - Task1 started.
2016-12-13 11:12:24,865:INFO SimpleAsyncTaskExecutor-2 (AsyncTask.java:34) - Task2 started.
2016-12-13 11:12:27,869:INFO SimpleAsyncTaskExecutor-2 (AsyncTask.java:39) - Task2 finished, time elapsed: 3001 ms.
2016-12-13 11:12:29,866:INFO SimpleAsyncTaskExecutor-1 (AsyncTask.java:27) - Task1 finished, time elapsed: 5001 ms.
2016-12-13 11:12:30,853:INFO main (TaskTests.java:23) - Task1 result: Task1 accomplished!
2016-12-13 11:12:30,853:INFO main (TaskTests.java:24) - Task2 result: Task2 accomplished!
2016-12-13 11:12:30,854:INFO main (TaskTests.java:30) - All tasks finished.

能够看到，没有自定义的Executor，因此使用缺省的TaskExecutor 。

 

前面是最简单的使用方法。若是想使用自定义的Executor，能够按照以下几步来：

一、新建一个Executor配置类，顺便把@EnableAsync注解搬到这里来：

@Configuration
@EnableAsync
public class ExecutorConfig {

	/** Set the ThreadPoolExecutor's core pool size. */
	private int corePoolSize = 10;
	/** Set the ThreadPoolExecutor's maximum pool size. */
	private int maxPoolSize = 200;
	/** Set the capacity for the ThreadPoolExecutor's BlockingQueue. */
	private int queueCapacity = 10;

	@Bean
	public Executor mySimpleAsync() {
		ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
		executor.setCorePoolSize(corePoolSize);
		executor.setMaxPoolSize(maxPoolSize);
		executor.setQueueCapacity(queueCapacity);
		executor.setThreadNamePrefix("MySimpleExecutor-");
		executor.initialize();
		return executor;
	}
	
	@Bean
	public Executor myAsync() {
		ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
		executor.setCorePoolSize(corePoolSize);
		executor.setMaxPoolSize(maxPoolSize);
		executor.setQueueCapacity(queueCapacity);
		executor.setThreadNamePrefix("MyExecutor-");

		// rejection-policy：当pool已经达到max size的时候，如何处理新任务
		// CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
		executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
		executor.initialize();
		return executor;
	}
}

这里定义了两个不一样的Executor，第二个从新设置了pool已经达到max size时候的处理方法；同时指定了线程名字的前缀。

二、自定义Executor的使用：

@Component
public class AsyncTask {
	protected final Logger logger = LoggerFactory.getLogger(this.getClass());
	
	@Async("mySimpleAsync")
	public Future<String> doTask1() throws InterruptedException{
		logger.info("Task1 started.");
		long start = System.currentTimeMillis();
        Thread.sleep(5000);
        long end = System.currentTimeMillis();
        
        logger.info("Task1 finished, time elapsed: {} ms.", end-start);
        
        return new AsyncResult<>("Task1 accomplished!");
	}
	
	@Async("myAsync")
	public Future<String> doTask2() throws InterruptedException{
		logger.info("Task2 started.");
		long start = System.currentTimeMillis();
        Thread.sleep(3000);
        long end = System.currentTimeMillis();
        
        logger.info("Task2 finished, time elapsed: {} ms.", end-start);
        
        return new AsyncResult<>("Task2 accomplished!");
	}
}

就是把上面自定义Executor的类名，放进@Async注解中。

三、（测试用例不变）测试结果：

2016-12-13 10:57:11,998:INFO MySimpleExecutor-1 (AsyncTask.java:22) - Task1 started.
2016-12-13 10:57:12,001:INFO MyExecutor-1 (AsyncTask.java:34) - Task2 started.
2016-12-13 10:57:15,007:INFO MyExecutor-1 (AsyncTask.java:39) - Task2 finished, time elapsed: 3000 ms.
2016-12-13 10:57:16,999:INFO MySimpleExecutor-1 (AsyncTask.java:27) - Task1 finished, time elapsed: 5001 ms.
2016-12-13 10:57:17,994:INFO main (TaskTests.java:23) - Task1 result: Task1 accomplished!
2016-12-13 10:57:17,994:INFO main (TaskTests.java:24) - Task2 result: Task2 accomplished!
2016-12-13 10:57:17,994:INFO main (TaskTests.java:30) - All tasks finished.
2016-12-13 10:57:18,064 Thread-3 WARN Unable to register Log4j shutdown hook because JVM is shutting down. Using SimpleLogger

可见，线程名字的前缀变了，两个task使用了不一样的线程池了。

参考博客：http://blog.csdn.net/clementad/article/details/53607311