content: package com.jiron.gateway.handler;
  
  import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
  import com.alibaba.csp.sentinel.slots.block.BlockException;
  import com.jiron.common.core.utils.ServletUtils;
  import org.springframework.web.reactive.function.server.ServerResponse;
  import org.springframework.web.server.ServerWebExchange;
  import org.springframework.web.server.WebExceptionHandler;
  import reactor.core.publisher.Mono;
  
  /**
   * 自定义限流异常处理
   *
   * @author ruoyi
   */
  public class SentinelFallbackHandler implements WebExceptionHandler
  {
      private Mono<Void> writeResponse(ServerResponse response, ServerWebExchange exchange)
      {
          return ServletUtils.webFluxResponseWriter(exchange.getResponse(), "请求超过最大数，请稍候再试");
      }
  
      @Override
      public Mono<Void> handle(ServerWebExchange exchange, Throwable ex)
      {
          if (exchange.getResponse().isCommitted())
          {
              return Mono.error(ex);
          }
          if (!BlockException.isBlockException(ex))
          {
              return Mono.error(ex);
          }
          return handleBlockedRequest(exchange, ex).flatMap(response -> writeResponse(response, exchange));
      }
  
      private Mono<ServerResponse> handleBlockedRequest(ServerWebExchange exchange, Throwable throwable)
      {
          return GatewayCallbackManager.getBlockHandler().handleRequest(exchange, throwable);
      }
  }
  