@ControllerAdvice
public class MyException {

    @ExceptionHandler(UnauthorizedException.class)
    public String UnauthorizedException(RuntimeException e, HandlerMethod handlerMethod, HttpServletResponse resp) throws IOException {
        e.printStackTrace();
        //1. 獲取到當(dāng)前出現(xiàn)異常的方法
        //直接在參數(shù)定義HandlerMethod
        //2. 判斷該方法上面是否有@ResponseBody注解
        //ResponseBody responseBody = handlerMethod.getMethodAnnotation(ResponseBody.class);

        //這個(gè)方法直接返回boolean類型
        boolean flag = handlerMethod.hasMethodAnnotation(ResponseBody.class);
        //如有，處理異步請求的異常
        if (flag){
            JsonResult jsonResult = new JsonResult(false, "操作失敗，請咨詢110");
            //將jsonResult格式化為json格式的字符串，存儲到j(luò)sonString中
            String jsonString = JSON.toJSONString(jsonResult);
            //設(shè)置寫回客戶端的格式及字符集
            resp.setContentType("application/json;charset=UTF-8");
            //將json數(shù)據(jù)返回到客戶端瀏覽器
            resp.getWriter().write(jsonString);
            return null;
        }
        //如果沒有，處理頁面跳轉(zhuǎn)請求的異常
        else {
            return "common/nopermission";
        }

    }

    @ExceptionHandler(RuntimeException.class)
    public String runtimeException(HandlerMethod handlerMethod,HttpServletResponse response) throws IOException {
        //判斷執(zhí)行方法是否含有ResponseBody注解
        boolean flag = handlerMethod.hasMethodAnnotation(ResponseBody.class);
        if (flag){
            //含有,返回json格式的字符串
            JsonResult js = new JsonResult(false,"操作失敗");
            String str = JSON.toJSONString(js);
            response.getWriter().write(str);
            return null;
        }else {
            //返回錯(cuò)誤頁面
            return "common/error";
        }

    }
}