public class BusinessException extends RuntimeException {
protected String message;
public BusinessException(String resultCode) {
this.message=resultCode;
}

@Builder
@AllArgsConstructor
@NoArgsConstructor
@Data
public class DefaultErrorResult {
private Integer status;
public static DefaultErrorResult failure(BusinessException e) {
DefaultErrorResult result = new DefaultErrorResult();
result.setMessage(e.getMessage());
result.setStatus(600);
result.setError("Business Error");
result.setException(e.getClass().getName());
result.setPath(RequestContextHolderUtil.getRequest().getRequestURI());
result.setTimestamp(new Date());
return result;
}
}

@ControllerAdvice
public class GlobalExceptionHandler {
/**
* 处理400类异常
* 违反约束异常
*/
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ExceptionHandler(ConstraintViolationException.class)
public DefaultErrorResult handleConstraintViolationException(ConstraintViolationException e, HttpServletRequest request) {


log.error("handleConstraintViolationException start, uri:{}, caused by: ", request.getRequestURI(), e);
List<ParameterInvalidItem> parameterInvalidItemList = ParameterInvalidItemHelper.convertCVSetToParameterInvalidItemList(e.getConstraintViolations());
return DefaultErrorResult.failure(ResultCode.COMM_PARAM_IS_INVALID, e, HttpStatus.BAD_REQUEST, parameterInvalidItemList);

}
/**
* 处理验证参数封装错误时异常
*/
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ExceptionHandler(HttpMessageNotReadableException.class)
public DefaultErrorResult handleConstraintViolationException(HttpMessageNotReadableException e, HttpServletRequest request) {
log.error("handleConstraintViolationException start, uri:{}, caused by: ", request.getRequestURI(), e);
return DefaultErrorResult.failure(ResultCode.COMM_PARAM_IS_INVALID, e, HttpStatus.BAD_REQUEST);
}

/**
* 处理参数绑定时异常（反400错误码）
*/
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ExceptionHandler(BindException.class)
public DefaultErrorResult handleBindException(BindException e, HttpServletRequest request) {
log.error("handleBindException start, uri:{}, caused by: ", request.getRequestURI(), e);
List<ParameterInvalidItem> parameterInvalidItemList = ParameterInvalidItemHelper.convertBindingResultToMapParameterInvalidItemList(e.getBindingResult());
return DefaultErrorResult.failure(ResultCode.COMM_PARAM_IS_INVALID, e, HttpStatus.BAD_REQUEST, parameterInvalidItemList);

}
/**
* 处理使用@Validated注解时，参数验证错误异常（反400错误码）
*/
@ResponseStatus(HttpStatus.BAD_REQUEST)
@ExceptionHandler(MethodArgumentNotValidException.class)
public DefaultErrorResult handleMethodArgumentNotValidException(MethodArgumentNotValidException e, HttpServletRequest request) {
log.error("handleMethodArgumentNotValidException start, uri:{}, caused by: ", request.getRequestURI(), e);
List<ParameterInvalidItem> parameterInvalidItemList = ParameterInvalidItemHelper.convertBindingResultToMapParameterInvalidItemList(e.getBindingResult());
return DefaultErrorResult.failure(ResultCode.COMM_PARAM_IS_INVALID, e, HttpStatus.BAD_REQUEST, parameterInvalidItemList);

}
/* 处理运行时异常 （反500错误码）*/
@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
@ExceptionHandler(RuntimeException.class)
public DefaultErrorResult handleRuntimeException(RuntimeException e, HttpServletRequest request) {
//TODO 可通过邮件、微信公众号等方式发送信息至开发人员、记录存档等操作
log.error("handleRuntimeException start, uri:{}, caused by: ", request.getRequestURI(), e);
return DefaultErrorResult.failure(ResultCode.COMM_SYSTEM_INNER_ERROR, e, HttpStatus.INTERNAL_SERVER_ERROR);
}
/* 处理自定义异常 */
/*
主要在这里进行一个自定义异常的处理
首先通过Business.class说明该函数接管此类异常
*/
@ExceptionHandler(BusinessException.class)
public ResponseEntity<DefaultErrorResult> handleBusinessException(BusinessException e, HttpServletRequest request) {
log.error("handleBusinessException start, uri:{}, exception:{}, caused by: {}", request.getRequestURI(), e.getClass(), e.getMessage());
//通过定义的failure方法来初始化格式化的返回结果
DefaultErrorResult defaultErrorResult = DefaultErrorResult.failure(e);
/*
ResponseEntity.status().body();
status处可填入任何状态码，填多少返回时的HTTP状态就是多少，body处填入返回的结果
*/
return ResponseEntity.status(defaultErrorResult.getStatus()).body(defaultErrorResult);
}