Feign框架对于文件上传消息体格式并没有做原生支持，需要集成模块feign-form来实现。
独立使用Feign
添加模块依赖：
<!-- Feign框架核心 -->
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-core</artifactId>
<version>11.1</version>
</dependency>
<!-- 支持表单格式，文件上传格式 -->
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form</artifactId>
<version>3.8.0</version>
</dependency>
<!-- 文件操作工具类 -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.11.0</version>
</dependency>
上传文件
定义接口：
public interface FileUploadAPI {
// 上传文件：参数为单个文件对象
@RequestLine("POST /test/upload/single")
@Headers("Content-Type: multipart/form-data")
String upload(@Param("file") File file);
// 上传文件：参数文多个文件对象
@RequestLine("POST /test/upload/batch")
@Headers("Content-Type: multipart/form-data")
String upload(@Param("files") File[] files);
// 上传文件：参数文多个文件对象
@RequestLine("POST /test/upload/batch")
@Headers("Content-Type: multipart/form-data")
String upload(@Param("files") List<File> files);
// 上传文件：参数为文件字节数组（这种方式在服务端无法获取文件名，不要使用）
@RequestLine("POST /test/upload/single")
@Headers("Content-Type: multipart/form-data")
String upload(@Param("file") byte[] bytes);
// 上传文件：参数为FormData对象
@RequestLine("POST /test/upload/single")
@Headers("Content-Type: multipart/form-data")
String upload(@Param("file") FormData photo);
// 上传文件：参数为POJO对象
@RequestLine("POST /test/upload/single")
@Headers("Content-Type: multipart/form-data")
String upload(@Param("file") MyFile myFile);
class MyFile {
@FormProperty("is_public")
Boolean isPublic;
File file;
public Boolean getPublic() {
return isPublic;
}
public void setPublic(Boolean aPublic) {
isPublic = aPublic;
}
public File getFile() {
return file;
}
public void setFile(File file) {
this.file = file;
}
}
}调用接口：
FileAPI fileAPI = Feign.builder()
.encoder(new FormEncoder()) // 必须明确设置请求参数编码器
.logger(new Slf4jLogger())
.logLevel(Logger.Level.FULL)
.target(FileAPI.class, "http://localhost:8080");
File file1 = new File("C:\\Users\\xxx\\Downloads\\test1.jpg");
File file2 = new File("C:\\Users\\xxx\\Downloads\\test2.jpg");
// 上传文件1：参数为文件对象
fileAPI.upload(file1);
// 上传文件2：参数为字节数组（注意：在服务端无法获取到文件名）
byte[] bytes = FileUtils.readFileToByteArray(file1);
fileAPI.upload(bytes);
// 上传文件3：参数为FormData对象
byte[] bytes = FileUtils.readFileToByteArray(file1);
FormData formData = new FormData("image/jpg", "test1.jpg", bytes);
String result = fileAPI.upload(formData);
// 上传文件4：参数为POJO对象
FileAPI.MyFile myFile = new FileAPI.MyFile();
myFile.setPublic(true);
myFile.setFile(file1);
fileAPI.upload(myFile);
// 上传文件：参数为多个文件
fileAPI.upload(new File[]{file1, file2});
fileAPI.upload(Arrays.asList(new File[]{file1, file2}));下载文件
定义接口：
public interface FileDownloadAPI {
// 下载文件
@RequestLine("GET /test/download/file")
Response download(@QueryMap Map<String, Object> queryMap);
}调用接口：
// 下载文件时返回值为Response对象，不需要设置解码器
FileAPI fileAPI = Feign.builder()
.logger(new Slf4jLogger())
.logLevel(Logger.Level.FULL)
.target(FileAPI.class, "http://localhost:8080");
String fileName = "test.jpg";
Map<String, Object> queryMap = new HashMap<>();
queryMap.put("fileName", fileName);
Response response = fileAPI.download(queryMap);
if (response.status() == 200) {
File downloadFile = new File("D:\\Downloads\\", fileName);
FileUtils.copyInputStreamToFile(response.body().asInputStream(), downloadFile);
}使用Spring Cloud Feign
在Spring框架中使用Feign实现文件上传时需要依赖feign-form和feign-form-spring，这2个模块已经在“Spring Cloud Feign”中自带了，只需要添加spring-cloud-starter-openfeign依赖即可。
<!-- 集成Spring和Feign，包含了模块feign-form和feign-form-spring -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>3.0.2</version>
</dependency>
<!-- 文件操作工具类 -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.11.0</version>
</dependency>上传文件
定义接口及配置：
@FeignClient(value = "FileAPI", url = "http://localhost:8080", configuration = FileUploadAPI.FileUploadAPIConfiguration.class)
public interface FileUploadAPI {
@RequestMapping(value = "/test/upload/single", method = RequestMethod.POST, headers = "Content-Type=multipart/form-data")
String upload(@RequestPart("file") MultipartFile file);
@RequestMapping(value = "/test/upload/batch", method = RequestMethod.POST, headers = "Content-Type=multipart/form-data")
String upload(@RequestPart("files") List<MultipartFile> files);
class FileUploadAPIConfiguration {
@Autowired
private ObjectFactory<HttpMessageConverters> messageConverters;
@Bean
public Encoder feignEncoder () {
return new SpringFormEncoder(new SpringEncoder(messageConverters));
}
@Bean
public Logger feignLogger() {
return new Slf4jLogger();
}
@Bean
public Logger.Level feignLoggerLevel() {
return Logger.Level.FULL;
}
}
}调用接口：
// 上传单个文件
File file = new File("C:\\Users\\xxx\\Downloads\\test1.jpg");
FileInputStream fis = new FileInputStream(file);
MockMultipartFile mockMultipartFile = new MockMultipartFile("file", file.getName(), "image/jpg", fis);
this.fileUploadAPI.upload(mockMultipartFile);
fis.close();
// 上传多个文件
File file1 = new File("C:\\Users\\xxx\\Downloads\\test1.jpg");
File file2 = new File("C:\\Users\\xxx\\Downloads\\test2.jpg");
FileInputStream fis1 = new FileInputStream(file1);
FileInputStream fis2 = new FileInputStream(file2);
MockMultipartFile f1 = new MockMultipartFile("files", file1.getName(), "image/jpg", fis1);
MockMultipartFile f2 = new MockMultipartFile("files", file2.getName(), "image/jpg", fis2);
this.fileUploadAPI.upload(Arrays.asList(new MockMultipartFile[]{f1, f2}));
fis1.close();
fis2.close();下载文件
定义接口：
@FeignClient(value = "FileDownloadAPI", url = "http://localhost:8080", configuration = FileDownloadAPI.FileDownloadAPIConfiguration.class)
public interface FileDownloadAPI {
@RequestMapping(value = "/test/download/file", method = RequestMethod.GET)
Response download(@RequestParam("fileName") String fileName);
// 下载文件时返回值为Response对象，不需要设置解码器
class FileDownloadAPIConfiguration {
@Bean
public Logger feignLogger() {
return new Slf4jLogger();
}
@Bean
public Logger.Level feignLoggerLevel() {
return Logger.Level.FULL;
}
}
}调用接口：
String fileName = "test.jpg";
Response response = this.fileDownloadAPI.download(fileName);
File destFile = new File("D:\\Downloads\\", fileName);
// 使用org.apache.commons.io.FileUtils工具类将输入流中的内容转存到文件
FileUtils.copyInputStreamToFile(response.body().asInputStream(), destFile);总结
1.Feign框架需要集成模块feign-form才能支持文件上传的消息体格式。
2.不论是独立使用Feign，还是使用Spring Cloud Feign，下载文件时的返回值都必须为feign.Response类型。
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