详解Spring Controller autowired Request变量

public final Object invokeForRequest(NativeWebRequest request, ModelAndViewContainer mavContainer,
   Object... providedArgs) throws Exception {
 
  Object[] args = getMethodArgumentValues(request, mavContainer, providedArgs);
  if (logger.isTraceEnabled()) {
   StringBuilder sb = new StringBuilder("Invoking [");
   sb.append(getBeanType().getSimpleName()).append(".");
   sb.append(getMethod().getName()).append("] method with arguments ");
   sb.append(Arrays.asList(args));
   logger.trace(sb.toString());
  }
  Object returnValue = invoke(args);
  if (logger.isTraceEnabled()) {
   logger.trace("Method [" + getMethod().getName() + "] returned [" + returnValue + "]");
  }
  return returnValue;
}

/**
 * Register web-specific scopes ("request", "session", "globalSession", "application")
 * with the given BeanFactory, as used by the WebApplicationContext.
 * @param beanFactory the BeanFactory to configure
 * @param sc the ServletContext that we're running within
 */
public static void registerWebApplicationScopes(ConfigurableListableBeanFactory beanFactory, ServletContext sc) {
  beanFactory.registerScope(WebApplicationContext.SCOPE_REQUEST, new RequestScope());
  beanFactory.registerScope(WebApplicationContext.SCOPE_SESSION, new SessionScope(false));
  beanFactory.registerScope(WebApplicationContext.SCOPE_GLOBAL_SESSION, new SessionScope(true));
  if (sc != null) {
   ServletContextScope appScope = new ServletContextScope(sc);
   beanFactory.registerScope(WebApplicationContext.SCOPE_APPLICATION, appScope);
   // Register as ServletContext attribute, for ContextCleanupListener to detect it.
   sc.setAttribute(ServletContextScope.class.getName(), appScope);
  }
 
  beanFactory.registerResolvableDependency(ServletRequest.class, new RequestObjectFactory());
  beanFactory.registerResolvableDependency(HttpSession.class, new SessionObjectFactory());
  beanFactory.registerResolvableDependency(WebRequest.class, new WebRequestObjectFactory());
  if (jsfPresent) {
   FacesDependencyRegistrar.registerFacesDependencies(beanFactory);
  }
}


 

 

 /**
 * Factory that exposes the current request object on demand.
 */
 @SuppressWarnings("serial")
 private static class RequestObjectFactory implements ObjectFactory<ServletRequest>, Serializable {

 public ServletRequest getObject() {
  return currentRequestAttributes().getRequest();
 }

 @Override
 public String toString() {
  return "Current HttpServletRequest";
 }
 }