BlockException异常统一处理

BlockException异常统一处理
springwebmvc接口资源限流入口在HandlerInterceptor的实现类AbstractSentinelInterceptor的preHandle方法中，对异常的处理是BlockExceptionHandler的实现类
sentinel 1.7.1 引入了sentinel-spring-webmvc-adapter.jar
自定义BlockExceptionHandler 的实现类统一处理BlockException

@Slf4j
@Component
public class MyBlockExceptionHandler implements BlockExceptionHandler {
    @Override
    public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception {
        log.info("BlockExceptionHandler BlockException================"+e.getRule());
        R r = null;
        if (e instanceof FlowException) {
            r = R.error(100,"接口限流了");
        } else if (e instanceof DegradeException) {
            r = R.error(101,"服务降级了");
        } else if (e instanceof ParamFlowException) {
            r = R.error(102,"热点参数限流了");
        } else if (e instanceof SystemBlockException) {
            r = R.error(103,"触发系统保护规则了");
        } else if (e instanceof AuthorityException) {
            r = R.error(104,"授权规则不通过");
        }
        //返回json数据
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        new ObjectMapper().writeValue(response.getWriter(), r);
    }
}

测试：