Eureka + Ribbon + RestTemplate + Hystrix （使用熔斷器Hystrix ）

改造Eureka + Ribbon + RestTemplate 負載均衡  點擊進入查看

Step 3-1：添加依賴

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

 

注：不熟悉如何搭建Spring Boot 項目，請點擊

 

Step 3-2：編寫啓動類@EnableHystrix，開啓熔斷器

@SpringBootApplication
@EnableDiscoveryClient
@EnableHystrix
public class ServiceRibbonApplication {

	public static void main(String[] args) {
		SpringApplication.run(ServiceRibbonApplication.class, args);
	}

	@Bean
	@LoadBalanced
	RestTemplate restTemplate() {
		return new RestTemplate();
	}

}

 Step 3-3：改造Service 

@Service
public class HelloService {

    @Autowired
    RestTemplate restTemplate;

    @HystrixCommand(fallbackMethod = "hiError")
    public String hiService(String name) {
        return restTemplate.getForObject("http://SERVICE-HI/hi?name="+name,String.class);
    }

    public String hiError(String name) {
        return "hi,"+name+",sorry,error!";
    }

}

•   啓動後效果：訪問 http://localhost:8764/hi?name=forezp                           

瀏覽器交替顯示：

hi forezp,i am from port:8762

hi forezp,i am from port:8763

•  關閉SERVICE-HI：訪問 http://localhost:8764/hi?name=forezp 

瀏覽器顯示：

hi,forezp,sorry,error!