Spring Boot uses AOP to uniformly handle web layer exceptions.

Spring Boot uses AOP to uniformly handle web layer exceptions.

By default, springboot errors are redirected to the error/error page in the request's returned rendering path.

Source code analysis: DefaultErrorViewResolver. java

 private ModelAndView resolve(String viewName, Map<String, Object> model) { String errorViewName = "error/" + viewName; TemplateAvailabilityProvider provider = this.templateAvailabilityProviders  .getProvider(errorViewName, this.applicationContext); if (provider != null) {  return new ModelAndView(errorViewName, model); } return resolveResource(errorViewName, model); }

For example, in application. properites, configure the rendering page

# Configure freemakerspring. freemarker. template-loader-path =/WEB-INF/

If not configuredspring.freemarker.template-loader-path,springbootThesrc/main/resourcesFind the error rendering page under the error file in templates.

Then when an error occurs, the system will jump to the/WEB-INF/error page.

Use AOP for web layer Exception Handling

Package com. niugang. aop; import java. io. IOException; import javax. servlet. servletException; import javax. servlet. http. httpServletRequest; import org. aspectj. lang. annotation. afterThrowing; import org. aspectj. lang. annotation. aspect; import org. slf4j. logger; import org. slf4j. loggerFactory; import org. springframework. stereotype. component; import org. springframework. web. context. request. requestAttributes; import org. springframework. web. context. request. requestContextHolder; import org. springframework. web. context. request. servletRequestAttributes; import org. springframework. web. servlet. modelAndView;/*** unified exception handling at the controller layer ** @ author niugang **/@ Aspect @ Componentpublic class ExceptionControllerAscept {private Logger logger = LoggerFactory. getLogger (ExceptionControllerAscept. class);/*** anonymous cut-off method ** @ param ex * @ throws ServletException * @ throws IOException */@ AfterThrowing (value = "execution (public * com. niugang. controller .. *. *(..)) ", throwing =" ex ") public ModelAndView aroundAdvice (Exception ex) throws ServletException, IOException {ModelAndView modelAndView = new ModelAndView (); RequestAttributes requestAttributes = RequestContextHolder. getRequestAttributes (); ServletRequestAttributes r = (ServletRequestAttributes) requestAttributes; HttpServletRequest request = r. getRequest (); modelAndView. setViewName ("500"); // first, if RuntimeException if (ex instanceof RuntimeException) {logger. error ("throwing a runtime exception {}", ex. getMessage (); modelAndView. addObject ("exception", ex. getMessage (); // jump to the error page modelAndView. addObject ("url", request. getRequestURL (); return modelAndView;} modelAndView. addObject ("exception", "unknown exception"); return modelAndView ;}}

Summary

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