【Feign】Spring Cloud Feign Client 调用文件上传接口（实现MultipartFile上传文件功能）

场景：

        跨服务调用文件上传接口

        技术栈：Feign + nacos

报错：

                feign.codec.EncodeException: Error converting request body

解决方案：

step1：添加pom依赖

        <!--这里我使用nacos注册中心，如果没有使用可以不用nacos-discovery-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

step2：添加配置类  FeignMultipartSupportConfig.java

import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.*;
import org.springframework.web.client.RestTemplate;


@Configuration
public class FeignMultipartSupportConfig {

    @Bean
    @Primary
    @Scope("prototype")
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(new ObjectFactory<HttpMessageConverters>() {
            @Override
            public HttpMessageConverters getObject() throws BeansException {
                return new HttpMessageConverters(new RestTemplate().getMessageConverters());
            }
        }));
    }

    @Bean
    public feign.Logger.Level multipartLoggerLevel() {
        return feign.Logger.Level.FULL;

    }
}

step3：编写Feign Client

import com.hzd.config.FeignMultipartSupportConfig;
import com.privatecloud.core.dto.JsonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;

/**
 * 注意点
 * 1：configuration = FeignMultipartSupportConfig.class
 * 2.consumes = MediaType.MULTIPART_FORM_DATA_VALUE
 */

@FeignClient(value = "baseserver",configuration = FeignMultipartSupportConfig.class)
public interface BaseserverClient {

    /**
     * 文件上传至阿里云
     * @param file
     * @param imei
     * @param sysDictItemId
     * @return
     */
    @PostMapping(value = "/file/image/uplode", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    JsonResult<String> upload(@RequestPart MultipartFile file);
}

step4：调用

@Api(tags = "植物智能管理", value = "植物库")
@RestController
@RequestMapping("/plant/AI")
@Slf4j
public class PlantAIController {


    @Autowired
    private BaseserverClient baseserverClient;

    @PostMapping("/recognition")
    public void test(@RequestPart(value = "file", required = false) MultipartFile file){

        baseserverClient.upload(file);

    }

}