SpringBoot+springmvc异步处理请求

有两种情况，第一种是业务逻辑复杂，但不需要业务逻辑的结果，第二种是需要返回业务逻辑的处理结果

第一种比较简单，利用多线程处理业务逻辑，或者利用spring中@Asyn注解更简单，

使用@Asyn注解，要首先要配置开启异步注解

@Configuration  





@EnableAsync





public class AsyncConfig {





 





}

然后直接在方法上注解即可

@Service





public class AsyncAction {





	





	@Async





	public void fun1() {





		try {





			Thread.sleep(10000);





		} catch (InterruptedException e) {





			// TODO Auto-generated catch block





			e.printStackTrace();





		}





		System.out.println("fun1");





	}





}

切记异步类的bean不能被重复扫描，而且只能被sping容器的上下文扫描，不能被spingmvc扫描，否则异步失效

第二种需要返回业务逻辑情况则首先需要开启异步支持

public class SpitterWebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {





	@Override





	protected void customizeRegistration(Dynamic registration) {





		registration.setAsyncSupported(true);





	}

或者在web.xml中开启

<servlet>





<servlet-name>SpringMvc</servlet-name>





<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>





<init-param>





<param-name>contextConfigLocation</param-name>





<param-value>...</param-value>





</init-param>





<load-on-startup>1</load-on-startup>





<async-supported>true</async-supported>





</servlet>

然后配置一下线程池

@Configuration





@EnableWebMvc





@ComponentScan("spittr.web")





public class WebConfig extends WebMvcConfigurerAdapter {





	





	@Override





	public void configureAsyncSupport(AsyncSupportConfigurer configurer) {





		ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();





		executor.setCorePoolSize(5);





		executor.setMaxPoolSize(10);





		executor.setQueueCapacity(50);





		executor.setThreadNamePrefix("abc-");





		executor.setKeepAliveSeconds(30);





		configurer.setTaskExecutor(executor);





		configurer.setDefaultTimeout(600);





	}

@Configuration





@EnableWebMvc





@ComponentScan("spittr.web")





public class WebConfig extends WebMvcConfigurerAdapter {

这样就可以开始异步处理任务了，能够尽快释放servlet线程，缓解高并发问题

@RequestMapping(value = "/async")





    





    public @ResponseBody Callable<String> async() {

	return new Callable<String>() {
            @Override
            public String call() throws Exception {
                Thread.sleep(2000);
                return "Callable result";
            }
        };

}