spring boot下 500 404 错误页面处理的方法

<bean 
 class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> 
 <property name="exceptionMappings"> 
  <props> 
  <prop key="org.apache.shiro.authz.UnauthenticatedException">pages/403</prop> 
  <prop key="org.apache.shiro.authz.UnauthorizedException">pages/403</prop> 
  <prop key="org.apache.shiro.authc.LockedAccountException">pages/locked</prop> 
  <prop key="java.lang.Throwable">pages/500</prop> 
  </props> 
 </property> 
 </bean>

@Bean 
public ServletRegistrationBean dispatcherRegistration(DispatcherServlet dispatcherServlet) { 
  ServletRegistrationBean registration = new ServletRegistrationBean( 
      dispatcherServlet); 
  dispatcherServlet.setThrowExceptionIfNoHandlerFound(true); 
  return registration; 
} 

@ControllerAdvice 
public class GlobalControllerExceptionHandler { 
 public static final String DEFAULT_ERROR_VIEW = "pages/404"; 
 
  @ExceptionHandler(value = NoHandlerFoundException.class) 
  public ModelAndView defaultErrorHandler(HttpServletRequest req, Exception e) throws Exception { 
    ModelAndView mav = new ModelAndView(); 
    mav.addObject("exception", e); 
    mav.addObject("url", req.getRequestURL()); 
    mav.setViewName(DEFAULT_ERROR_VIEW); 
    return mav; 
  } 
} 

@Controller 
public class MainsiteErrorController implements ErrorController { 
 
 private static final String ERROR_PATH = "/error"; 
  
 @RequestMapping(value=ERROR_PATH) 
  public String handleError(){ 
    return "pages/404"; 
  } 
  
 @Override 
 public String getErrorPath() { 
 // TODO Auto-generated method stub 
 return ERROR_PATH; 
 } 
 
}