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在Spring Cloud封裝的Feign中并不直接支持傳文件，但可以通過引入Feign的擴展包來實現，本來就來具體說說如何實現。

服務提供方（接收文件）

服務提供方的實現比較簡單，就按Spring MVC的正常實現方式即可，比如：

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class Application {

@RestController
public class UploadController {

@PostMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public String handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
return file.getName();
}

}

public static void main(String[] args) {
new SpringApplicationBuilder(Application.class).web(true).run(args);
}

}

服務消費方（發送文件）

在服務消費方由于會使用Feign客戶端，所以在這里需要在引入feign對表單提交的依賴，具體如下：

<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>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>

定義文件上傳方的應用主類和FeignClient，假設服務提供方的服務名為eureka-feign-upload-server

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class Application {

public static void main(String[] args) {
new SpringApplicationBuilder(Application.class).web(true).run(args);
}

}

@FeignClient(value = "upload-server", configuration = UploadService.MultipartSupportConfig.class)
public interface UploadService {

@PostMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
String handleFileUpload(@RequestPart(value = "file") MultipartFile file);

@Configuration
class MultipartSupportConfig {
@Bean
public Encoder feignFormEncoder() {
return new SpringFormEncoder();
}
}

}

在啟動了服務提供方之后，嘗試在服務消費方編寫測試用例來通過上面定義的Feign客戶端來傳文件，比如：

@Slf4j
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class UploadTester {

@Autowired
private UploadService uploadService;

@Test
@SneakyThrows
public void testHandleFileUpload() {

File file = new File("upload.txt");
DiskFileItem fileItem = (DiskFileItem) new DiskFileItemFactory().createItem("file",
MediaType.TEXT_PLAIN_VALUE, true, file.getName());

try (InputStream input = new FileInputStream(file); OutputStream os = fileItem.getOutputStream()) {
IOUtils.copy(input, os);
} catch (Exception e) {
throw new IllegalArgumentException("Invalid file: " + e, e);
}

MultipartFile multi = new CommonsMultipartFile(fileItem);

log.info(uploadService.handleFileUpload(multi));
}

}