springMVC custom 400 or 404 page/interface

The 400 or 404 pages that come with SpringMVC are all web pages, which are not suitable for the json data required by the client.

Default 404 :

 

Default 400 pages :

How to implement custom response to these errors?

Define a  ControllerAdvice class:

Add the following two methods in it to respond 400 and 404 respectively:

 /***
     * 响应400错误
     * @param ex
     * @param session
     * @param request
     * @param response
     * @return
     */
    @ExceptionHandler(org.springframework.beans.TypeMismatchException.class)
    public String handle400Exception2(org.springframework.beans.TypeMismatchException ex, HttpSession session, HttpServletRequest request, HttpServletResponse response) {
        String respCode = "400";
        logger.error(respCode, ex);
        LogicBusinessException logicBusinessException = new LogicBusinessException();
        logicBusinessException.setErrorCode(respCode);
        logicBusinessException.setErrorMessage(ex.getValue() + " " + ex.getMessage());
        BusinessExceptionUtil.dealException(logicBusinessException, response);
        return null;
    }

    /***
     * 响应404 错误
     * @param ex
     * @param session
     * @param request
     * @param response
     * @return
     */
    @ExceptionHandler(org.springframework.web.servlet.NoHandlerFoundException.class)
//org.springframework.web.servlet.NoHandlerFoundException: No handler found for GET /agent2/follow/query/json, headers={host=[127.0.0.1:8080], connection=[keep-alive], upgrade-insecure-requests=[1]}
    public String handleNotFound404Exception2(org.springframework.web.servlet.NoHandlerFoundException ex, HttpSession session, HttpServletRequest request, HttpServletResponse response) {
        String respCode = "404";
        logger.error(respCode, ex);
        LogicBusinessException logicBusinessException = new LogicBusinessException();
        logicBusinessException.setErrorCode(respCode);
        logicBusinessException.setErrorMessage(ex.getRequestURL() + " " + SystemHWUtil.splitAndFilterString(ex.getMessage(), 60));
        BusinessExceptionUtil.dealException(logicBusinessException, response);
        return null;
    }

My processing method is to return json, the result:

{
  "result": false,
  "param": null,
  "errorCode": "404",
  "value": null,
  "error": {
    "code": "404",
    "hint": null,
    "msg": "/cooperate2/myReceived/listfilter/json No handler found for GET /cooperate2/myReceived/listfilter/j......"
  },
  "extraInfo": null
}

You can customize the BusinessExceptionUtil.dealException method in my code.

My code base in the code cloud:

https://gitee.com/kunlunsoft/inetAdress_socket

https://gitee.com/kunlunsoft/stub_test