Spring HandlerInterceptor:如何访问类注释？

Question

我使用以下代码注册了我的拦截器

@EnableWebMvc
public class WebMvcConfig extends WebMvcConfigurerAdapter {
 ...
 @Override
 public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor( myInterceptor() );
 }
 ...
}

这里是拦截器定义

public class MyInterceptorimplements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

    // Check to see if the handling controller is annotated
    for (Annotation annotation : Arrays.asList(handler.getClass().getDeclaredAnnotations())){
        if (annotation instanceof MyAnnotation){
            ... do something

但是,handler.getClass().getDeclaredAnnotations()不会返回截获的Controller的类级别注释.

我只能得到方法级注释,这不是我想要的.

相同的拦截器适用于xml配置(使用Spring 3):

<bean id="handlerMapping" class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
    <property name="interceptors">
        <list>
            <ref bean="myInterceptor"/>
        </list>
    </property>
</bean>

有没有办法在Spring 4中提供类级信息？

根据 In-Spring-mvc拦截器,我如何访问处理程序控制器方法？ "HandlerInterceptors将仅使用上述配置为您提供对HandlerMethod的访问权限".但是获取类级别信息的替代配置是什么？

Answer 1

您可以使用处理程序方法访问拦截器中的spring控制器类级别注释.

 @Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
  System.out.println("Pre-handle");
  HandlerMethod hm;
  try {
   hm = (HandlerMethod) handler;
  } catch (ClassCastException e) {
   return super.preHandle(request, response, handler);
  }
  Method method = hm.getMethod();
  HandlerMethod hm = (HandlerMethod) handler;
  Method method = hm.getMethod();
  // Sometimes Controller.class wont work and you have to use RestController.class just depends on what you use.
  if (method.getDeclaringClass().isAnnotationPresent(Controller.class)) {
   if (method.isAnnotationPresent(ApplicationAudit.class)) {
    System.out.println(method.getAnnotation(ApplicationAudit.class).value());
    request.setAttribute("STARTTIME", System.currentTimemillis());
   }
  }
  return true;
 }