open feign简单使用

步骤:

1. 导包 需要导入open-feign和负载均衡器

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

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

2. 开启服务注解设定扫描包 并将服务注册到注册中心

@SpringBootApplication
@EnableFeignClients(basePackages = {"com.lyra.provider"})
@EnableDiscoveryClient
public class FeignApplication {
    public static void main(String[] args) {
        SpringApplication.run(FeignApplication.class, args);
    }
}

3. 设置服务名称 注册中心的地址以及帐号密码

spring:
  application:
    name: feign-client
  cloud:
    nacos:
      discovery:
        server-addr: 10.0.4.3:8848
        username: nacos
        password: nacos
server:
  port: 8082

编写接口类 FeignClient value中填写服务在中册中心的服务名 path写路由名称也就是之前具体实现的RequestMapping

@FeignClient(value = "provider", path = "/name")
public interface TestControllerAPI {
    @GetMapping("/sayName")
    public String sayName(@RequestParam String name);
}

组合注入调用即可