springMVC custom 400 or 404 page/response

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

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:

/***
     * Respond to 400 errors
     * @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;
    }

    /***
     * Respond to 404 errors
     * @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