如何解决使用feign传递参数类型为MultipartFile的问题

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传递参数类型为MultipartFile

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。

引入maven依赖

                    io.github.openfeign.form            feign-form            3.3.0                            io.github.openfeign.form            feign-form-spring            3.3.0        

加入配置类

@Configurationpublic class FeignMultipartSupportConfig {     @Bean    @Primary    @Scope("prototype")    public Encoder multipartFormEncoder() {        return new SpringFormEncoder();    }     @Bean    public feign.Logger.Level multipartLoggerLevel() {        return feign.Logger.Level.FULL;    }}

在feign客户端进行配置

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);

feign传参MultipartFile问题解决

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

首先引入依赖

             io.github.openfeign.form            feign-form            3.8.0                             io.github.openfeign.form            feign-form-spring            3.8.0        

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

新建feign的配置

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 */@Configurationpublic class FeignSupportConfig {     @Autowired    private ObjectFactory messageConverters;     @Bean    public Encoder feignFormEncoder() {        return new SpringFormEncoder(new SpringEncoder(messageConverters));    } }

在feign接口中配置

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 get(@PathVariable("id") Long id);      /**     * id批量查询图片信息     * @param idList     * @return     */    @PostMapping("/web/picture/getByIdList")    Result> getByIdList(@RequestBody List 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 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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