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<dependency>
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    <groupId>org.springframework.cloud</groupId>
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    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
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</dependency>

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spring:
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  application:
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    # 服务名
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    name: service-consumer
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  cloud:
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    nacos:
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      discovery:
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        # 服务注册中心
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        server-addr: 192.168.141.132:8848
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      config:
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        # 服务配置中心
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        server-addr: 192.168.141.132:8848
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    # 熔断限流
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    sentinel:
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      transport:
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        dashboard: localhost:8888
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# 开启 Feign 对 Sentinel 的支持
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feign:
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  sentinel:
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    enabled: true
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server:
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  # 服务端口
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  port: 8080
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management:
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  # 端点检查（健康检查）
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  endpoints:
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    web:
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      exposure:
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        include: "*"
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user:
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  name: "灶门祢豆子"

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package com.funtl.spring.cloud.alibaba.consumer.service.fallback;
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import com.funtl.spring.cloud.alibaba.consumer.service.EchoService;
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import org.springframework.stereotype.Component;
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@Component
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public class EchoServiceFallback implements EchoService {
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    @Override
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    public String echo(String string) {
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        return "echo fallback";
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    }
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    @Override
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    public String lb() {
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        return "lb fallback";
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    }
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}

1
package com.funtl.spring.cloud.alibaba.consumer.service;
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import com.funtl.spring.cloud.alibaba.consumer.service.fallback.EchoServiceFallback;
3
import org.springframework.cloud.openfeign.FeignClient;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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@FeignClient(value = "service-provider", fallback = EchoServiceFallback.class)
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public interface EchoService {
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    @GetMapping(value = "/echo/{string}")
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    String echo(@PathVariable("string") String string);
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    @GetMapping(value = "/lb")
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    String lb();
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}