SpringCloud教程之服务消费者(rest + ribbon + hystrix)（五）

朱雀 2023-02-12 14:26 19阅读 0赞

## SpringCloud服务消费者rest + ribbon + hystrix ##

在父工程目录下创建一个maven项目，在这个maven项目中添加依赖

<dependencies>
            <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.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            </dependency>
        </dependencies>

在配置文件application.yml中添加以下配置

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:7010/eureka/
    server:
      port: 8777
    spring:
      application:
        name: ribbon-service
    
    management:
      endpoints:
        web:
          exposure:
            include: hystrix.stream
      endpoint:
        health:
          show-details: always

启动类

@SpringBootApplication
    @EnableEurekaClient
    @EnableDiscoveryClient
    @EnableHystrix
    public class RibbonApplication {
        public static void main(String[] args) {
            SpringApplication.run( RibbonApplication.class, args );
        }
    
        @Bean
        @LoadBalanced
        RestTemplate restTemplate() {
            return new RestTemplate();
        }
    }

Web层

@Controller
    public class RemoteRibbon {
    
        @Autowired
        RemoteService remoteService;
    
        @GetMapping("/hi")
        public String hi(@RequestParam String name) {
            return remoteService.hiService(name);
        }
    }

service层

@Service
    public class RemoteService {
    
        @Autowired
        RestTemplate restTemplate;
    
        @HystrixCommand(fallbackMethod = "hiError")
        public String hiService(String name) {
            String forObject = restTemplate.getForObject("http://server02/hi?name=" + name, String.class);
            System.out.println(forObject);
            return forObject;
        }
    
        public String hiError(String name) {
            return "Hystrix：" + name;
        }
    }

依次启动Eureka、config-server、再启动本服务

在浏览器上访问[http://localhost:8777/hi?name=][http_localhost_8777_hi_name]啊啊啊 ,返回服务提供者的值

关闭服务提供者服务，再次访问返回Hystrix: 啊啊啊

[http_localhost_8777_hi_name]: http://localhost:8777/hi?name='%20rel=