Multipartfile文件传输 1. 添加依赖 dependency groupIdio.github.openfeign.form/groupId artifactIdfeign-form/artifactId version3.3.0/version /dependency dependency groupIdio.github.openfeign.form/groupId artifactIdfeign-form-spring/art
Multipartfile文件传输
1. 添加依赖
<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>
2. 添加配置类
@Configuration public class FeignMultipartConfig { @Bean @Primary @Scope("prototype") public SpringFormEncoder multipartFormEncoder() { return new SpringFormEncoder(); } @Bean public feign.Logger.Level multipartLoggerLevel() { return feign.Logger.Level.FULL; } }
3. 接口编写
@FeignClient使用配置类
@PostMapping设置
consumes = MediaType.MULTIPART_FORM_DATA_VALUE
使用@RequestPart(),不能使用@RequestParam()
@FeignClient(value = "face-service",configuration = FeignMultipartConfig.class) public interface FaceClient { @PostMapping(value = "/search/student", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) ResponseBase<SearchStudentFaceVO> searchStudentFace(@RequestPart("file") MultipartFile file); }
feign不能正常传递参数MultipartFile(文件)的解决
之前工作中有个业务场景:需要把文件以MultipartFile进行服务之间的调用(使用的是Feign),特此记录下踩到的坑
需要注意的是:使用默认的springcloud自带的spring-cloud-starter-openfeign是不支持传递文件的。
我看网上有很多使用feign-form和feign-form-spring支持的jar包,然后配置SpringFormEncoder,但我试了,没有成功,最后使用了另外一种方法,在此记录下吧:
方法一:使用外部依赖
<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>
新建配置类:
package com.jsyd.ict.ictservicemanager.configuration; 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 feign.codec.Encoder; import feign.form.spring.SpringFormEncoder; import org.springframework.context.annotation.Configuration; /** * 处制定了注入的feignFormEncoder可以覆盖掉原本的encoder * 该方式可以让发送multipartFile成为可能 * @author wangyang * @version 1.0 * @date 2021/4/13 19:13 */ @Configuration public class MultipartSupportConfig { @Autowired private ObjectFactory<HttpMessageConverters> messageConverters; @Bean public Encoder feignFormEncoder() { return new SpringFormEncoder(new SpringEncoder(messageConverters)); } }
配置feign接口:
package com.jsyd.ict.ictservicemanager.feign; import com.jsyd.ict.ictservicemanager.util.resp.RespUtil; 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.io.BufferedInputStream; import java.io.File; import java.io.InputStream; /** * 能力的调用 * * @author wangyang * @version 1.0 * @date 2021/3/11 21:01 */ @FeignClient(name = "ict-service-capacity", configuration = MultipartSupportConfig.class) public interface CapacityFeign { @RequestMapping(value = "contentAudit/baiduImgAuditByFile", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE) RespUtil baiduImgAuditByFile(@RequestPart(value = "file") MultipartFile file); }
注意:文件的传输需要使用@RequestPart()注解
服务端:
@RequestMapping(value = "/baiduImgAuditByFile", method = RequestMethod.POST) public RespUtil baiduImgAuditByFile(@RequestParam("file") MultipartFile file) { // 调用service return null; }
结果发现,这样是获取不到结果的,研究了好一会,因为要着急联调,就没有继续跟踪了,有时间在深入研究下。
后来使用了下面的方法,成功传参
方法二:使用HttpServletRequest获取
上述操作都不需要,即:不需要导入依赖,也不需要创建文件,只需要在服务端通过HttpServletRequest去设置
使用HttpServletRequest设置:
伪代码如下:
@RequestMapping(value = "/baiduImgAuditByFile", method = RequestMethod.POST) public RespUtil baiduImgAuditByFile(MultipartFile file, HttpServletRequest request) { if (file == null) { // 解决服务间调用无法接受MultipartFile参数的问题 String contentType = request.getContentType(); if (contentType != null && contentType.toLowerCase().startsWith("multipart/")) { MultipartHttpServletRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class); if (multipartRequest != null) { MultiValueMap<String, MultipartFile> multiFileMap = multipartRequest.getMultiFileMap(); for (Map.Entry<String, List<MultipartFile>> entry : multiFileMap.entrySet()) { file = entry.getValue().get(0); } } } } // 处理业务逻辑 return null; }
主要说明如下图:
即通过HttpServletRequest 的方式即使文件获取不到,也可以进行特殊处理,从而获取文件。
以上为个人经验,希望能给大家一个参考,也希望大家多多支持自由互联。