spring boot + feign + Hystrix 整合 （亲测有效）

spring boot + feign + Hystrix 整合，步骤如下：

1. pom依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
    <version>3.0.6</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
     <version> 2.2.10.RELEASE</version>
</dependency>

1. properties 开启选项

feign:
  client:
    config:
       default:
         #发起重试的时间间隔3s
         feignPeriod: 3000
         #发起重试的最大时间间隔10s，单位毫秒
         feignMaxPeriod: 10000
         #重试次数2，如果需要重试1次，就设置为2
         feignMaxAttempts: 3
         #5s connectTimeout 和 readTimeout 必须同时配置
         connectTimeout: 5000
         readTimeout: 5000
         writeTimeout: 5000
  compression:
    request:
      enabled: true
    response:
      enabled: true
  httpclient:
    enabled: false
  okhttp:
    enabled: true
  circuitbreaker:
    enabled: true

hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 5000

注：这里开启选项为feign.circuitbreaker.enable=true，这是对2021年后的spring cloud版本的。 Spring Cloud CircuitBreaker 已经是独立项目了。 springcloud早期版本用下面这段配置在feign中生效：feign.hystrix.enabled=true

1. Java code example

注意使用@EnableHystrix 和@EnableFeignClients

@EnableTransactionManagement
@EnableAspectJAutoProxy
@Configuration
@SpringBootApplication(scanBasePackages = {"cn.com.datang.supersms"},exclude = {ArchaiusAutoConfiguration.class})
@EnableCaching
@EnableFeignClients(basePackages = "cn.com.datang.supersms.rpc")
@EnableHystrix
public class AhohSuerSMSDeliveryApplication {
    public static void main(String[] args) {
        SpringApplication.run(AhohSuerSMSDeliveryApplication.class, args);
    }
}

业务代码

@FeignClient(
        name = "portrayalApi",
        url = "${datang.portrayal.addr}",
        fallbackFactory = PortrayalApiFallbackFactory.class
)
public interface PortrayalApi {
    @GetMapping(value = "/upb2")
    String getInterestedCarsInfo(@RequestParam(value = "appid") String appid,
                                 @RequestParam(value = "type") String type,
                                 @RequestParam(value = "id") String id);
}
@Slf4j
@Component
public class PortrayalApiFallbackFactory implements FallbackFactory<PortrayalApi> {
    @Override
    public PortrayalApi create(Throwable cause) {
        return (appid, type, id) -> {
             log.warn("网络调用异常，使用降级措施来处理了.异常信息:",cause);
             return null;
         };
    }
}

好了，到此结束，亲自有效！