<mark>服務降級處理是在客戶端實現的，與服務端沒有關系</mark>。為了方便演示降級效果，在這里搭建一個客戶端模塊 cloud-comsumer-feign-hystrix-order80，讓它調用服務端模塊 cloud-provider-hystrix-payment8001。 <br/> 步驟如下： **1. 構建消費端模塊：cloud-comsumer-feign-hystrix-order80** **2. 在當前模塊的`pom.xml`中添加 hystrix 依賴** ```xml <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-hystrix</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> <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-starter-test</artifactId> <scope>test</scope> </dependency> ... </dependencies> ``` **3. 當前模塊的`resources/application.yml`** ```yml server: port: 80 eureka: client: service-url: defaultZone: http://www.eureka7001.com:7001/eureka/,http://www.eureka7002.com:7002/eureka/ spring: application: name: cloud-comsumer-order feign: hystrix: #在feign中開啟hystrix支持 enabled: true #要訪問的微服務名 provider: payment: name: cloud-payment-service ``` **4. 在當前模塊的啟動類上標注注解`@EnableHystrix`** ```java @SpringBootApplication @EnableFeignClients @EnableHystrix //該注解已經包含@EnableCircuitBreaker public class OrderHystrixMain80 { public static void main(String[] args) { SpringApplication.run(OrderHystrixMain80.class, args); } } ``` **5. 構建完成！**