这篇文章主要介绍如何解决使用feign传递参数类型为MultipartFile的问题，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
feign默认是不支持多媒体文件类型的文件传输的，但是可以通过引入第三方jar包解决这个问题，步骤可以分为三步。
计算
安全
数据库
网络和加速
企业服务
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form-spring</artifactId>
<version>3.3.0</version>
</dependency>@Configuration
public class FeignMultipartSupportConfig {
@Bean
@Primary
@Scope("prototype")
public Encoder multipartFormEncoder() {
return new SpringFormEncoder();
}
@Bean
public feign.Logger.Level multipartLoggerLevel() {
return feign.Logger.Level.FULL;
}
}import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;
import config.FeignMultipartSupportConfig;
import feign.Response;
@FeignClient(value = "", fallback = FileServiceFallback.class,configuration=FeignMultipartSupportConfig.class)
public interface IFileService {
//上传文件
@RequestMapping(value = "/rmi/fileService/mediaImgUpload", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public String mediaImgUpload(@RequestPart MultipartFile file);
//下载文件
@RequestMapping(value = "/rmi/fileService/mediaDownload",method = RequestMethod.GET,consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
public Response mediaDownload(@RequestParam(required = true) String mediaId);首先，feign服务之间的调用，传参默认的格式为：ContentType=application/x-www-form-urlencoded
以表单的形式传参的，而文件流的传参，需要form-data的ContentType，否则会报错的
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form</artifactId>
<version>3.8.0</version>
</dependency>
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form-spring</artifactId>
<version>3.8.0</version>
</dependency>注意spring boot版本是2.x以上的，上面两个依赖的版本不低于3.5.0，否则还是无效的
package com.wm.blog_config.config;
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;
/**
* @author ：半卷流年
* @description : 解决feign传递流数据的异常
* @createTime ：2020/6/14
*/
@Configuration
public class FeignSupportConfig {
@Autowired
private ObjectFactory<HttpMessageConverters> messageConverters;
@Bean
public Encoder feignFormEncoder() {
return new SpringFormEncoder(new SpringEncoder(messageConverters));
}
}package com.wm.blog_admin.feign;
import com.wm.blog_admin.feign.factory.PictureClientFallbackFactory;
import com.wm.blog_common.constatnt.CommonConstant;
import com.wm.blog_common.domain.TFileDO;
import com.wm.blog_common.entity.TFile;
import com.wm.blog_common.req.TFileQuery;
import com.wm.blog_common.result.Result;
import com.wm.blog_config.config.CustomFeignConfig;
import com.wm.blog_config.config.FeignSupportConfig;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.util.List;
/***
* @ClassName: PictureFeignClient
* @Description: picture feign调用 todo feign使用get有坑啊,是否考虑使用HttpClient替换feign的HttpURLConnection，采用apache的HttpClient
* @Author: wm_yu
* @Create_time: 16:39 2020-3-26
*/
@FeignClient(value = CommonConstant.PICTURE_MODULE_NAME, configuration = {CustomFeignConfig.class, FeignSupportConfig.class}, fallbackFactory = PictureClientFallbackFactory.class)
public interface PictureFeignClient {
/**
* id查询图片信息
* @param id
* @return
*/
@GetMapping("/web/picture/{id}")
Result<TFileDO> get(@PathVariable("id") Long id);
/**
* id批量查询图片信息
* @param idList
* @return
*/
@PostMapping("/web/picture/getByIdList")
Result<List<TFile>> getByIdList(@RequestBody List<Long> idList);
/**
* 文件上传
* @param file
* @return
*/
@PostMapping(value = "/web/picture/uploadFile",produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
Result<String> uploadFile(@RequestPart("file") MultipartFile file);
}
注意加上这个，表示传参格式：
就可以传参了的
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