@EnableAsync(proxyTargetClass = true)@SpringBootApplicationpublic class Application extends AsyncConfigurerSupport {   @Override  public Executor getAsyncExecutor() {    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();    executor.setTaskDecorator(new MdcTaskDecorator()); //重点    executor.initialize();    return executor;  }   public static void main(String[] args) {    SpringApplication.run(Application.class, args);  }}

class MdcTaskDecorator implements TaskDecorator {   @Override  public Runnable decorate(Runnable runnable) {    // Right now: Web thread context !    // (Grab the current thread MDC data)    Map
    
      contextMap = MDC.getCopyOfContextMap();    return () -> {      try {        // Right now: @Async thread context !        // (Restore the Web thread context's MDC data)        MDC.setContextMap(contextMap);        runnable.run();      } finally {        MDC.clear();      }    };  }}