SpringCloud组件fiegn默认是不支持传递文件的。但是提供了feign-form扩展工具

解决方法：

步骤一：在消费者服务中加入相关pom依赖。

<!--解决SpringCloud 组件feign默认是不支持传递文件的-->
        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form-spring</artifactId>
            <version>3.6.0</version>
        </dependency>
        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form</artifactId>
            <version>3.6.0</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>

步骤二：编写一个配置类

package com.ckfuture.springcloud.config;

import feign.Logger;
import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Scope;


/**
 * 解决feign文件传递问题的配置类
 */
@Configuration
public class FeignMultipartSupportConfig {
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;
    @Bean
    @Primary
    @Scope("prototype")
    public Encoder multipartFormEncoder(){
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    }
    @Bean
    public feign.Logger.Level multipartLoggerLevel(){
        return feign.Logger.Level.FULL;
    }

}

步骤三：feign接口的编写。服务调用方加注解类（配置类）

package com.ckfuture.springcloud.deliveryman.service;

import com.alibaba.fastjson.JSONObject;
import com.ckfuture.springcloud.config.FeignMultipartSupportConfig;
import com.ckfuture.springcloud.utils.Result;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;


/**
 * @description: 消费者-信息服务接口
 * @author: CKFuture
 * @since: 2024-03-19 13：24
 * @version: v1.0
 * @LastEditTime:
 * @LastEditors:
 * @copyright: hrbckfuture.com
 */
@FeignClient(value = "${service-url.nacos-user-service}",configuration = FeignMultipartSupportConfig.class)//解决feign文件传递问题的配置类feign配置类
public interface IDeliverymanService {

   

    /**
     * 批量添加信息
     * @param excelFile
     * @param agencyId
     * @return
     */
    @PostMapping(value = "/deliveryman/uploadExcel", consumes = {"multipart/form-data"})//“multipart/form-data”指定类型
    public Result uploadExcel(
            @RequestPart("excelFile") MultipartFile excelFile,
            @RequestParam(value = "agencyId", required = true) Integer agencyId
    ) throws IOException;

}

步骤四：修改消费者提供的服务提供类@RequestPart 来接收文件参数

package com.ckfuture.springcloud.deliveryman.controller;

import com.alibaba.fastjson.JSONObject;
import com.ckfuture.springcloud.deliveryman.service.IDeliverymanService;
import com.ckfuture.springcloud.utils.Result;
import io.swagger.annotations.Api;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import org.springframework.http.MediaType;

import java.io.IOException;


/**
 * @descrption： 消费者-信息控制器
 * @author： CKFuture
 * @since： 2024-03-19 13：35
 * @version： v1.0
 * @LastEditTime：
 * @LastEditors：
 * @copyright： hrbckfuture.com
 */
@Api(tags={"基础管理/信息接口"})
@RestController
public class DeliverymanController {
    @Resource
    private IDeliverymanService service;

  
    /**
     * 批量添加信息
     * @param excelFile
     * @param agencyId
     * @return
     */
    @PostMapping(value = "/deliveryman/uploadExcel",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public Result uploadExcel(
            @RequestPart("excelFile") MultipartFile excelFile,
            @RequestParam(value = "agencyId", required = true) Integer agencyId
    ){
        try{
            System.out.println("我被调用了！");
            return service.uploadExcel(excelFile,agencyId);
        }catch (Exception ex){
            System.out.println(ex.getMessage());
            return Result.failure(1,"error");
        }
    }

}

注意点：文件流要用RequestPart注解传参数，其余参数用RequestParam注解传参。

步骤五：生产者提供服务

   /**
     * 生产者-批量添加信息
     * @param excelFile
     * @param agencyId
     * @return
     * @throws IOException
     */
    @PostMapping(value = "/deliveryman/uploadExcel", consumes = {"multipart/form-data"})
    @ResponseBody
    public Result uploadExcel(
            @RequestParam("excelFile") MultipartFile excelFile,
            @RequestParam(value = "agencyId", required = true) Integer agencyId
    ) throws IOException {
        try {
            //逻辑代码

        } catch (Exception ex) {
            return Result.failure(ResponseCode.ERROR, ResponseMsg.QUERY_ERROR);
        }
    }

本文引用：https://blog.csdn.net/qq_52211542/article/details/129779344