Sentinel Gateway自定义限流返回结果方式

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
            <version>2.2.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
            <version>2.2.7.RELEASE</version>
        </dependency>

spring:
  cloud:
    sentinel:
      scg:
        fallback:
          mode: response
          responseBody: "{\"code\":\"429\",\"msg\":\"请求太多了\"}"

	/**
	 * The fallback mode for sentinel spring-cloud-gateway. choose `redirect` or
	 * `response`.
	 */
	private String mode;

	/**
	 * Redirect Url for `redirect` mode.
	 */
	private String redirect;

	/**
	 * Response Body for `response` mode.
	 */
	private String responseBody;

	/**
	 * Response Status for `response` mode.
	 */
	private Integer responseStatus = HttpStatus.TOO_MANY_REQUESTS.value();

	/**
	 * Content-Type for `response` mode.
	 */
	private String contentType = MediaType.APPLICATION_JSON.toString();

import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.BlockRequestHandler;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.http.HttpStatus;
import org.springframework.http.InvalidMediaTypeException;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.net.URI;
import java.util.List;

import static org.springframework.web.reactive.function.BodyInserters.fromValue;

/**
 * @author TYH
 * @Description: Sentinel异常处理类
 * @date 2022/3/8 14:34
 */
public class SentinelBlockRequestHandler implements BlockRequestHandler {

    @Override
    public Mono<ServerResponse> handleRequest(ServerWebExchange exchange, Throwable t) {
        // 判断是否是html访问，如果是则转发url
        if (acceptsHtml(exchange)) {
            return htmlErrorResponse();
        }
        // 如果是接口访问，则返回提示
        return ServerResponse.status(HttpStatus.TOO_MANY_REQUESTS)
                .contentType(MediaType.APPLICATION_JSON_UTF8)
                .body(fromValue(new ResponseData(HttpStatus.TOO_MANY_REQUESTS.value(),"请求太多了")));
    }

    private Mono<ServerResponse> htmlErrorResponse() {
        String url="http://www.baidu.com";
        URI uri =URI.create(url);
        return ServerResponse.temporaryRedirect(uri).build();
    }

    private boolean acceptsHtml(ServerWebExchange exchange) {
        try {
            List<MediaType> acceptedMediaTypes = exchange.getRequest().getHeaders().getAccept();
            acceptedMediaTypes.remove(MediaType.ALL);
            MediaType.sortBySpecificityAndQuality(acceptedMediaTypes);
            return acceptedMediaTypes.stream()
                    .anyMatch(MediaType.TEXT_HTML::isCompatibleWith);
        } catch (InvalidMediaTypeException ex) {
            return false;
        }
    }

    /**
     * 定义返回的实体类，字段根据需要添加
     */
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    static class ResponseData {
        private int code;
        private String msg;
    }
}

import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.context.annotation.Configuration;

/**
 * @author TYH
 * @Description:
 * @date 2022/3/8 15:02
 */
@Slf4j
@Configuration
public class InitConfig implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        log.info("初始化限流handler");
        GatewayCallbackManager.setBlockHandler(new SentinelBlockRequestHandler());
    }
}