pom文件

    <dependencies>
        <!-- hystrix -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        <!--eureka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency><!--&lt;!&ndash; 引入自己定义的api通用包，可以使用Payment支付Entity &ndash;&gt;-->
            <groupId>com.hj.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

yml文件配置

server:
  port: 80
spring:
  application:
    name: cloud-customer-feign-hystrix-service
eureka:
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://127.0.0.1:7001/eureka/
feign:
  hystrix:
    enabled: true

添加PaymentFallbackService类

@Component
public class PaymentFallbackService implements PaymentHystrixService{


    @Override
    public String paymentInfo_OK(Integer id) {
        return "PaymentFallbackService paymentInfo_OK";
    }

    @Override
    public String paymentInfo_TimeOut(Integer id) {
        return "PaymentFallbackService paymentInfo_TimeOut";
    }
}

在PaymentHystrixService中的@FeignClient注解里配置PaymentFallbackService

主启动类添加注解:  @EnableCircuitBreaker

@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
public class PaymentHystrixMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentHystrixMain8001.class,args);
    }
}

无论是超时异常，还是运行时异常。都会调用兜底方法