在Spring Cloud封裝的Feign中並不直接支援傳檔案，但可以通過引入Feign的擴充套件包來實現，本文就來具體說說如何實現。需要JAVA Spring Cloud大型企業分散式微服務雲構建的B2B2C電子商務平臺原始碼 一零三八七七四六二六
服務提供方（接收檔案）
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);
}
}
複製程式碼服務消費方（傳送檔案）
在服務消費方由於會使用Feign客戶端，所以在這裡需要在引入feign對錶單提交的依賴，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>
複製程式碼定義檔案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();
}
}
}
複製程式碼在啟動了服務提供方之後，嘗試在服務消費方編寫測試用例來通過上面定義的Feign客戶端來傳檔案，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));
}
}
複製程式碼