使用Spring Cloud Feign上传文件的示例

<dependency>
 <groupId>io.github.openfeign.form</groupId>
 <artifactId>feign-form</artifactId>
 <version>3.0.3</version>
</dependency>
<dependency>
 <groupId>io.github.openfeign.form</groupId>
 <artifactId>feign-form-spring</artifactId>
 <version>3.0.3</version>
</dependency>

@FeignClient(name = "ms-content-sample", configuration = UploadFeignClient.MultipartSupportConfig.class)
public interface UploadFeignClient {
 @RequestMapping(value = "/upload", method = RequestMethod.POST,
   produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},
   consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
 @ResponseBody
 String handleFileUpload(@RequestPart(value = "file") MultipartFile file);
 class MultipartSupportConfig {
  @Bean
  public Encoder feignFormEncoder() {
   return new SpringFormEncoder();
  }
 }
}

@RequestMapping(value = "/upload", method = RequestMethod.POST,
   produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},
   consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
中的produeces 、consumes 不能少；

@FeignClient("service-resource")
//@RequestMapping("/api/test")
public interface TestResourceItg {

 @RequestMapping(value = "/api/test/raw", method = RequestMethod.POST, consumes = "application/x-www-form-urlencoded")
 public String raw1(@PathVariable("subject") String subject, // 标题
     @RequestParam("content") String content); // 内容

}

@Bean
public MapFormHttpMessageConverter mapFormHttpMessageConverter(MultipartFileHttpMessageConverter multipartFileHttpMessageConverter) {
 MapFormHttpMessageConverter mapFormHttpMessageConverter = new MapFormHttpMessageConverter();
 mapFormHttpMessageConverter.addPartConverter(multipartFileHttpMessageConverter);
 return mapFormHttpMessageConverter;
}

@Bean
public MultipartFileHttpMessageConverter multipartFileHttpMessageConverter() {
 return new MultipartFileHttpMessageConverter();
}

@Bean
public Encoder feignEncoder(ObjectFactory<HttpMessageConverters> messageConverters) {
 return new FeignSpringFormEncoder(messageConverters);
}