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 {
 
}

@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");
    }
}

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);
  }

<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>

@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 {

@RequestMapping(value = "/async")
    
    public @ResponseBody Callable<String> async() {

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