Restful接口调用统一异常处理

1.关键字解释

//它是一个Controller增强器,可对controller中被 @RequestMapping注解的方法加一些逻辑处理
@ControllerAdvice
//异常定义
@ExceptionHandler
//返回格式为json,可以使用 @RestControllerAdvice 代替 @ControllerAdvice,这样在方法上就可以不需要添加 @ResponseBody
@ResponseBody

2.springmvc对于http请求的异常类型

Exception Type	HTTP Status Code
ConversionNotSupportedException	500 (Internal Server Error)
HttpMediaTypeNotAcceptableException	406 (Not Acceptable)
HttpMediaTypeNotSupportedException	415 (Unsupported Media Type)
HttpMessageNotReadableException	400 (Bad Request)
HttpMessageNotWritableException	500 (Internal Server Error)
HttpRequestMethodNotSupportedException	405 (Method Not Allowed)
MissingServletRequestParameterException	400 (Bad Request)
NoSuchRequestHandlingMethodException	404 (Not Found)
TypeMismatchException	400 (Bad Request)

3.代码

@ControllerAdvice
public class RestfulApiExceptionHandler {
    /**
     * 缺失参数
     * @param request
     * @param exception
     * @return
     */
    @ExceptionHandler(value = MissingServletRequestParameterException.class)
    @ResponseBody
    public Response missingParameterExceptionHandler(HttpServletRequest request, MissingServletRequestParameterException exception){
        return Response.failure("缺少必要参数,参数名称为" + exception.getParameterName());
    }

    /**
     * 参数类型不匹配
     * @param request
     * @param exception
     * @return
     */
    @ExceptionHandler({TypeMismatchException.class})
    @ResponseBody
    public Response typeMismatchExceptionHandler(HttpServletRequest request,TypeMismatchException exception){
        return Response.failure("参数类型不匹配,类型应该为" + exception.getRequiredType());
    }

    /**
     * 请求方法不支持
     * @param request
     * @param exception
     * @return
     */
    @ExceptionHandler(value = HttpRequestMethodNotSupportedException.class)
    @ResponseBody
    public Response methodNotSupportedExceptionHandler(HttpServletRequest request,HttpRequestMethodNotSupportedException exception){
        return Response.failure("不支持的请求方法");
    }
    /**
     * 其他异常
     * @param request
     * @param exception
     * @return
     */
    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public Response exceptionHandler(HttpServletRequest request, Exception exception){
        return Response.failure("系统异常");
    }
}