早期的 Feign 是不支持文件上传的，后来支持了，但是有部分缺陷，需要一次性读取到内存中再编码发送。
引入 Feign Client 文件上传依赖 <!-- Feign Client 上传文件支持 --> <dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form</artifactId> <version>${feign-form.version}</version> </dependency> <dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form-spring</artifactId> <version>${feign-form-spring.version}</version> </dependency> 配置类 /** * @Author：大漠知秋 * @Description：Feign Client 进行上传文件配置类 * @CreateDate：3:48 PM 2018/10/25 */ @Configuration public class FeignUploadFileSupportConfiguration { @Bean @Primary @Scope("prototype") public Encoder multipartFormEncoder() { return new SpringFormEncoder(); } } 消费者 Controller /** * @Author：大漠知秋 * @Description：Feign 上传文件 Controller * @CreateDate：3:27 PM 2018/10/25 */ @RestController @RequestMapping("/upload") public class FeignUploadFileController { @Resource private FeignUploadFileFeign feignUploadFileFeign; @RequestMapping( value = "/file", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE, consumes = MediaType.MULTIPART_FORM_DATA_VALUE ) public ResponseEntity<byte[]> file(@RequestPart("file") MultipartFile file) { return feignUploadFileFeign.file(file); } } 消费者 Feign /** * @Author：大漠知秋 * @Description：Feign 上传文件 * @CreateDate：3:27 PM 2018/10/25 */ @FeignClient(name = "demo-goods", configuration = FeignUploadFileSupportConfiguration.class) public interface FeignUploadFileFeign { @RequestMapping( value = "/upload/file", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE, consumes = MediaType.MULTIPART_FORM_DATA_VALUE ) ResponseEntity<byte[]> file(@RequestPart("file") MultipartFile file); } 提供者 Controller /** * @Author：大漠知秋 * @Description：Feign 上传文件 Controller * @CreateDate：3:27 PM 2018/10/25 */ @RestController @RequestMapping("/upload") public class FeignUploadFileController { @RequestMapping( value = "/file", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE, consumes = MediaType.MULTIPART_FORM_DATA_VALUE ) public String file(MultipartFile file) { System.err.println("原始文件名：" + file.getOriginalFilename()); System.out.println("文件大小：" + file.getSize()); return "上传成功"; } }源码：https://github.com/SlowSlicing/demo-spring-cloud-finchley/tree/FeignUploadFile
