<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-openfeign -->
<dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-starter-openfeign</artifactId>
 <version>2.0.4.RELEASE</version>
</dependency>

import com.bhz.demo.client.domain.req.ProductReceiveReq;
import com.bhz.demo.client.domain.resp.MemberPointBaseResp;
import com.bhz.demo.client.domain.resp.UserPointResp;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

/**
 * @Author guomz 
 * @create 2021/3/15 14:50 
 */
@FeignClient(url = "www.123.com", name = "demoClient")
public interface DemoClient {

  @RequestMapping(value = "/demo/user/{uuid}/{name}", method = RequestMethod.GET)
  DemoBaseResp<DemoUserResp> getUser(@PathVariable("uuid") String uuid, @PathVariable("name") String name);
  
  @RequestMapping(value = "/demo/buy", method = RequestMethod.POST)
  DemoBaseResp buyProduct(DemoBuyReq req);
}

@Service
@Slf4j
public class DemoService {
 @Autowired
 private DemoClient demoClient;
 public void getUser(Long id){
    demoClient.getUser("123", "abc");
 }
}

<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-ribbon -->
<dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
 <version>2.0.4.RELEASE</version>
</dependency>

import feign.Client;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.cloud.netflix.ribbon.SpringClientFactory;
import org.springframework.cloud.openfeign.ribbon.CachingSpringLoadBalancerFactory;
import org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.net.ssl.*;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
/**feign client配置
 * @Author guomz
 * @create 2021/3/16 9:52
 */
 @Configuration
public class FeignConfiguration {

/**
 * 調(diào)用https接口時繞過ssl證書驗證
 * @param cachingFactory
 * @param clientFactory
 * @return
 * @throws NoSuchAlgorithmException
 * @throws KeyManagementException
 */
 @Bean
 @ConditionalOnMissingBean public Client feignClient(@Qualifier("cachingLBClientFactory") CachingSpringLoadBalancerFactory cachingFactory, SpringClientFactory clientFactory) throws NoSuchAlgorithmException, KeyManagementException {
    SSLContext ctx = SSLContext.getInstance("TLSv1.2");
    X509TrustManager tm = new X509TrustManager() {
        @Override
        public void checkClientTrusted(X509Certificate[] x509Certificates, String s) {
          }
        @Override
        public void checkServerTrusted(X509Certificate[] x509Certificates, String s) {
          }
        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[0];
         }
    };
    ctx.init(null, new TrustManager[]{tm}, null);
    return new LoadBalancerFeignClient(new Client.Default(ctx.getSocketFactory(), new HostnameVerifier() {
    @Override
    public boolean verify(String hostname, SSLSession sslSession) {
            return true;
    }
        }),
    cachingFactory, clientFactory);
   }
}