feign传参MultipartFile问题如何解决

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feign传参MultipartFile问题

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

Feign传输 MultipartFile的一些问题

File转MultipartFile

pom.xml

org.springframeworkspring-mock2.0.8

public static MultipartFile getMultipartFile(String fileName, File file) throws IOException {    return new MockMultipartFile(fileName, file.getName(), ContentType.APPLICATION_OCTET_STREAM.toString(), new FileInputStream(file));}

报错 Current request is not a multipart request、Content type ‘’ not supported

@PostMapping设置 consumes = MediaType.MULTIPART_FORM_DATA_VALUE

使用@RequestPart()，不能使用@RequestParam()

@PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)ResultBody upload(@RequestPart(value = "file") MultipartFile file);

报错 Required request part ‘file’ is not present

configuration

@Configurationpublic class UploadFeignConfig {    @Bean    public Encoder multipartFormEncoder() {        return new SpringFormEncoder(new SpringEncoder(new ObjectFactory() {            @Override            public HttpMessageConverters getObject() throws BeansException {                return new HttpMessageConverters(new RestTemplate().getMessageConverters());            }        }));    }}

FeignClient

@FeignClient(value = FileConstants.FILE_SERVER, configuration= UploadFeignConfig.class)public interface FileServiceClient extends IFileServiceClient {    @Override    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)    ResultBody upload(@RequestPart(value = "file") MultipartFile file);}

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