解决异常的初衷

最近在做一个项目的时候，出现异常的时候会直接暴露给页面，页面是一堆很不友好的代码，客户的第一反应就是“这是什么玩意？”，为了解决这个问题，借鉴并改进，通过创建全局异常处理类，返回一些有提示性的、有图的异常页面。

解决方案

一、主要是通过 @ControllerAdvice 的功能捕捉Cotroller层的异常，不仅通过页面转发还可以通过JSON的方式回显

建立请求拦截器 ExceptionInterceptor，拦截返回页面和Controller的请求，判断是JSON还是返回页面

@Componentpublic class ExceptionInterceptor implements HandlerInterceptor{@Overridepublic boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {if (!(handler instanceof HandlerMethod)) {return true;}HandlerMethod hm = (HandlerMethod) handler;Method method = hm.getMethod();boolean isPage = method.getReturnType().equals(String.class);boolean isJosn = method.isAnnotationPresent(ResponseBody.class);boolean isController = (!hm.getBeanType().isAnnotationPresent(RestController.class) && hm.getBeanType().isAnnotationPresent(Controller.class));req.setAttribute(Constants.REPONSE_PAGE_TYPE, isPage && !isJosn && isController);return false;}@Overridepublic void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {}@Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)throws Exception {}}

二、处理异常结果，通过判断返回的是页面还是JSON数据来进行不同的处理通过http协议中不同的状态码进行分析，返回不同处理页面

@ControllerAdvice
public class GlobalExceptionResolver {private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionResolver.class);@ExceptionHandler(Exception.class )@ResponseBodypublic ModelAndView  handler(Exception e,HttpServletRequest request, HttpServletResponse response) throws Exception{logger.error(e.getMessage(),e);Object o = request.getAttribute(Constants.REPONSE_PAGE_TYPE);if( o == null) {throw e;}boolean isView = (Boolean)o;if(isView){  //返回页面//获取http状态码statusCode:401,404.jsp,500Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");if(statusCode == 400){return new ModelAndView("error/400");}else if(statusCode == 403){return new ModelAndView("error/403");}else if(statusCode == 404){return new ModelAndView("error/404");}else{return new ModelAndView("error/500");}}//返回jsonModelAndView mv = new ModelAndView(new MappingJackson2JsonView());mv.addObject("code","500");mv.addObject("message",e.getMessage());return mv;}}

三、依据返回的情况创建自己的异常处理界面，比如我的页面就是，一个带有动效的500异常页面