使用SpringBoot内置的@ControllerAdvice和@ExceptionHandler进行异常处理：

    • @ControllerAdvice：使用该注解即表示开启全局异常捕获，可自定义basePackages，用于标示异常捕获范围；
    • @ExceptionHandler：定义捕获异常的类型

    Asuka中预置了GlobalExceptionHandler，捕获com.asuka包内的异常。

    1. @ControllerAdvice(basePackages = "com.asuka")
    2. public class GlobalExceptionHandler {
    3.     private Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);
    5.     @ExceptionHandler(BusinessException.class)
    6.     public String businessExceptionHandler(BusinessException ex, HttpServletRequest request, HttpServletResponse response){
    7.         logger.error(ex.getMessage(), ex);
    8.         return doHandler("error/500.html", 500, ex.getMessage(), ex.toString(), request, response);
    9.     }
    11.     @ExceptionHandler(AccessDeniedException.class)
    12.     public String AccessDeniedException(AccessDeniedException ex, HttpServletRequest request, HttpServletResponse response) {
    13.         return doHandler("error/403.html", 403, ex.getMessage(), ex.toString(), request, response);
    14.     }
    16.     @ExceptionHandler(AuthenticationException.class)
    17.     public String AuthenticationException(AuthenticationException ex, HttpServletRequest request, HttpServletResponse response) {
    18.         return doHandler("error/403.html", 403, ex.getMessage(), ex.toString(), request, response);
    19.     }
    21.     @ExceptionHandler(IllegalArgumentException.class)
    22.     public String IllegalArgumentException(IllegalArgumentException ex, HttpServletRequest request, HttpServletResponse response) {
    23.         return doHandler("error/500.html", Constants.RESULT_ERROR_CODE, ex.getMessage(), ex.toString(), request, response);
    24.     }
    26.     @ExceptionHandler(NullPointerException.class)
    27.     public String NullPointerException(NullPointerException ex, HttpServletRequest request, HttpServletResponse response) {
    28.         logger.error(ex.getMessage(), ex);
    29.         return doHandler("error/500.html", Constants.RESULT_ERROR_CODE, ex.getMessage(), ex.toString(), request, response);
    30.     }
    32.     @ExceptionHandler(Exception.class)
    33.     public String errorHandler(Exception ex, HttpServletRequest request, HttpServletResponse response) {
    34.         logger.error(ex.getMessage(), ex);
    35.         if (ex instanceof IException) {
    36.             return doHandler("error/500.html", ((IException) ex).getCode(), ex.getMessage(), ex.toString(), request, response);
    37.         }
    38.         return doHandler("error/500.html", Constants.RESULT_ERROR_CODE, "系统错误", ex.toString(), request, response);
    39.     }
    41.     /**
    42.      * 处理错误,ajax返回json，非ajax跳转页面
    43.      */
    44.     private String doHandler(String url, Integer code, String msg, String error, HttpServletRequest request, HttpServletResponse response) {
    45.         if (isAjax(request)) {
    46.             cross(response);  // 支持跨域
    47.             response.setContentType("application/json;charset=utf-8");
    48.             try {
    49.                 PrintWriter out = response.getWriter();
    50.                 out.write(JSON.toJSONString(JsonResult.error(code, msg).put("error", error)));
    51.                 out.flush();
    52.                 out.close();
    53.             } catch (IOException e) {
    54.                 e.printStackTrace();
    55.             }
    56.             return null;
    57.         }
    58.         return url;
    59.     }
    61.     /**
    62.      * 判断是不是ajax请求
    63.      */
    64.     private boolean isAjax(HttpServletRequest request) {
    65.         String xHeader = request.getHeader("X-Requested-With");
    66.         return (xHeader != null && xHeader.contains("XMLHttpRequest"));
    67.     }
    69.     /**
    70.      * 支持跨域请求
    71.      */
    72.     private void cross(HttpServletResponse response) {
    73.         response.setHeader("Access-Control-Allow-Origin", "*");
    74.         response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
    75.         response.setHeader("Access-Control-Max-Age", "3600");
    76.         response.setHeader("Access-Control-Allow-Headers", "Content-Type, x-requested-with, X-Custom-Header, Authorization");
    77.     }
    79. }

    如果要针对各个服务捕获不同的异常，可以新建ExceptionHandler，区分不同的@ControllerAdvise的basePackages即可。