@FeignClient同一个name使用多个配置类报错，解决方案【转+改进】

今天手上的SpringCloud 项目做开发测试，多个FeigenClient报错，错误标题是（截取了部分）：

defined in null, could not be registered. A bean with that name has already

找了下资料，在以下两篇文章中找到需要的东西：

https://blog.csdn.net/neosmith/article/details/82349449

http://www.flydean.com/spring-cloud-openfeign-demo/

第二篇讲的更详细，但是在我按照文章中的代码改写代码时，还是无法正确生成bean。于是我改下了下，我用的spring cloud 版本是Greenwich.SR3，

原来的代码如下：

/**
 * 因为@FeignClient的value不能重复，所以需要在这里以自定义的方式来创建
 * @author wayne
 * @version FeignClientController,  2019/9/5 7:07 下午
 */
@Data
@Component
@Import(FeignClientsConfiguration.class)
public class FeignClientController {

    private OrderClient orderClient;
    private UserClient userClient;

    public FeignClientController(Decoder decoder, Encoder encoder, Client client, Contract contract) {
        this.orderClient = Feign.builder().client(client)
                .encoder(encoder)
                .decoder(decoder)
                .contract(contract)
                //默认是Logger.NoOpLogger
                .logger(new Slf4jLogger(OrderClient.class))
                //默认是Logger.Level.NONE
                .logLevel(Logger.Level.FULL)
                .target(OrderClient.class, "http://openfeign-server");

        this.userClient = Feign.builder().client(client)
                .encoder(encoder)
                .decoder(decoder)
                .contract(contract)
                //默认是Logger.NoOpLogger
                .logger(new Slf4jLogger(UserClient.class))
                //默认是Logger.Level.NONE
                .logLevel(Logger.Level.FULL)
                .target(UserClient.class, "http://openfeign-server");
    }
}

将client声明为bean，才能在我这个版本里解决文章头部的错误信息。

改写后代码（原示例代码上改）：

package com.flydean.client;

import feign.Client;
import feign.Contract;
import feign.Feign;
import feign.Logger;
import feign.codec.Decoder;
import feign.codec.Encoder;
import feign.slf4j.Slf4jLogger;
import org.springframework.cloud.openfeign.FeignClientsConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.stereotype.Component;

@Component
@Import(FeignClientsConfiguration.class)
public class FeignClientController {

    private OrderClient orderClient;
    private UserClient userClient;

    private Decoder decoder;
    private Encoder encoder;
    private Client client;
    private Contract contract;

    public FeignClientController(Decoder decoder, Encoder encoder, Client client, Contract contract) {

        this.decoder = decoder;
        this.encoder = encoder;
        this.client = client;
        this.contract = contract;

        String serverName = "http://openfeign-server";
        this.orderClient = initClient(OrderClient.class, serverName);

        this.userClient = initClient(UserClient.class, serverName);
    }

    private <T> T initClient(Class<T> clazz, String serverName) {
        return Feign.builder().client(client)
                .encoder(encoder)
                .decoder(decoder)
                .contract(contract)
                //默认是Logger.NoOpLogger
                .logger(new Slf4jLogger(clazz))
                //默认是Logger.Level.NONE
                .logLevel(Logger.Level.FULL)
                .target(clazz, serverName);
    }

    @Bean
    public OrderClient initOrderClient() {
        return orderClient;
    }

    @Bean
    public UserClient initUserClient() {
        return userClient;
    }
}