[微服務-sc-04] SpringCloud-Feign
阿新 • • 發佈:2020-10-27
Feign
Feign 是一個宣告式的 Web Service 客戶端。使用 Feign 能讓編寫 Web Service 客戶端更加簡單。Feign是一個宣告式的偽Http客戶端,它使得寫Http客戶端變得更簡單。使用Feign,只需要建立一個介面並註解。它具有可插拔的註解特性,可使用Feign 註解和JAX-RS註解。Feign支援可插拔的編碼器和解碼器。Feign預設集成了Ribbon,並和Eureka結合,預設實現了負載均衡的效果。
使用
1 新增依賴
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-feign</artifactId> </dependency>
2 定義Feign介面
@FeignClient(value = "service-hi") public interface SchedualServiceHi { @RequestMapping(value = "/hi",method = RequestMethod.GET) String sayHiFromClientOne(@RequestParam(value = "name") String name); } @RestController public class HiController { @Autowired SchedualServiceHi schedualServiceHi; @GetMapping(value = "/hi") public String sayHi(@RequestParam String name) { return schedualServiceHi.sayHiFromClientOne( name ); } }
3 開啟feign功能
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
@EnableFeignClients
public class ServiceFeignApplication {
public static void main(String[] args) {
SpringApplication.run(ServiceFeignApplication.class, args);
}
}