Spring Cloud使用Feign进行远程调用的操作指南

   //2远程查询用户信息
   String url="http://provider-server/provider/"+order.getUserId();
   
   //3. 发起调用
   User user = restTemplate.getForObject(url, User.class);

  <!-- 加入feign的依赖 -->
     <dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-starter-openfeign</artifactId>
     </dependency>

@EnableFeignClients

@FeignClient("provider-server")
public interface ProviderServeClient {
    /**
     * 根据id查询用户信息
     */
    @GetMapping("/provider/{id}")
    User queryById(@PathVariable("id") Long id);

}

    @Autowired
    private ProviderServeClient providerServeClient;

    /**
     * 根据id查询订单并返回
     */
    @Override
    public Order queryOrderById(Long orderId) {
        // 1.查询订单
        Order order = orderMapper.findById(orderId);

        //2远程查询用户信息
//        String url="http://provider-server/provider/"+order.getUserId();
        //2. 发起调用
//        User user = restTemplate.getForObject(url, User.class);

        User user = providerServeClient.queryById(order.getUserId());

        //3. 存入order
        order.setUser(user);
        // 4.返回
        return order;
    }

feign:
  client:
    config:
      default: # 全局的配置
        loggerLevel: BASIC 

feign:
  client:
    config:
      provider-server: # 写服务名称,则针对某个微服务的配置
        loggerLevel: FULL

public class FeignClientConfiguration {
    public Logger.Level feignLogLevel(){
        return Logger.Level.BASIC;
    }
}

@EnableFeignClients(defaultConfiguration = FeignClientConfiguration.class)

@FeignClient(value = "provider-server",configuration = FeignClientConfiguration.class)

        <!--httpClient的依赖 -->
        <dependency>
            <groupId>io.github.openfeign</groupId>
            <artifactId>feign-httpclient</artifactId>
        </dependency>

  httpclient:
    enabled: true # 开启feign对HttpClient的支持
    max-connections: 200 # 最大的连接数
    max-connections-per-route: 30 # 每个路径的最大连接数

Description:

Field providerServeClient in com.xing.service.impl.ConsumerServiceImpl required a bean of type 'com.api.clients.ProviderServeClient' that could not be found.

The injection point has the following annotations:
	- @org.springframework.beans.factory.annotation.Autowired(required=true)

@EnableFeignClients(basePackages = "com.api")

@EnableFeignClients(clients = {<!--{cke_protected}{C}%3C!%2D%2D%20%2D%2D%3E-->ProviderServeClient.class})