SpringMVC-异常处理

SpringMVC的异常处理是指统一包装异常的展示信息，实现HandlerExceptionResolver接口即可。

开发统一处理的异常解析器

public class GlobalExceptionResolver implements HandlerExceptionResolver {

    @Override
    public ModelAndView resolveException(HttpServletRequest request,
                                         HttpServletResponse response,
                                         Object o,
                                         Exception e) {
        if (o instanceof HandlerMethod) {
            HandlerMethod handlerMethod = (HandlerMethod) o;
            log.error("异常#Controller={},Method={}", handlerMethod.getBean(), handlerMethod.getMethod().getName(), e);
            // todo 判断属于Ajax的请求还是普通的页面请求
            if (isAsyncRequest(request, handlerMethod)) {
                // 返回JSON格式数据
                return buildJsonResponse(request, response, handlerMethod, e);
            } else {
                // 返回重定向页面
                return buildViewResponse(request, response, handlerMethod, e);
            }
        }
        return null;
    }

    /**
     * 构建JSON数据
     *
     * @return
     */
    private ModelAndView buildJsonResponse(HttpServletRequest request,
                                           HttpServletResponse response,
                                           HandlerMethod handlerMethod,
                                           Exception ex) {

        BaseResponse baseResponse = new BaseResponse().setCode("10").setMessage(ex.getMessage());
        // 使用jackson,也可以换成fastjson
        ModelAndView modelAndView = new ModelAndView(new MappingJackson2JsonView());
        modelAndView.addObject("result", baseResponse);
        return modelAndView;
    }

    /**
     * 重定向错误页面
     *
     * @return
     */
    private ModelAndView buildViewResponse(HttpServletRequest request,
                                           HttpServletResponse response,
                                           HandlerMethod handlerMethod,
                                           Exception ex) {
        ModelAndView errorView = new ModelAndView();
        errorView.setViewName("redirect:/error-page");
        errorView.addObject("errorMessage", ex.getMessage());
        return errorView;
    }

    /**
     * 根据handlerMethod的注解来判断是不是ajax请求
     */
    public static boolean isAsyncRequest(HttpServletRequest request, HandlerMethod handlerMethod) {
        // 方法上有@ResponseBody 表示返回JSON
        ResponseBody responseBody = handlerMethod.getMethodAnnotation(ResponseBody.class);
        if (null != responseBody) {
            return true;
        }

        //判断Controller类上有没有@RestController
        RestController restController = AnnotationUtils.findAnnotation(handlerMethod.getBeanType(), RestController.class);
        if (null != restController) {
            return true;
        }

        //判断Controller类上有没有@ResponseBody
        responseBody = AnnotationUtils.findAnnotation(handlerMethod.getBeanType(), ResponseBody.class);
        if (null != responseBody) {
            return true;
        }
        return false;
    }
}

配置异常解析器

<bean id="globalExceptionResolver" class="com.zmx.GlobalExceptionResolver"/>