本文实例为大家分享了Feign实现跨服务的文件上传下载操作，供大家参考，具体内容如下
1、跨服务文件上传，目前feign不支持调用文件上传接口，需要自行配置来满足feign的调用方式
①.首先需要在pom文件里添加feign依赖
<dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form-spring</artifactId> <version>3.2.2</version> </dependency> <dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form</artifactId> <version>3.2.2</version> </dependency>
②.上传的接口
@FeignClient(value = "fdn-storage", configuration = {FileFeignConfig.class})
public interface FileClient {
String PREFIX_PATH = "/oss/files";
/**
* 上传存储文件
* @param file
* @return
* @throws IOException
*/
@PostMapping(value = PREFIX_PATH + "/", consumes = MULTIPART_FORM_DATA_VALUE)
FeignResult<FileEntity> save(@RequestPart(value = "file") MultipartFile file) throws IOException;
}
③.添加配置来满足feign的调用
@Configuration
public class FileFeignConfig {
@Autowired
private ObjectFactory<HttpMessageConverters> messageConverters;
@Bean
@Primary
@Scope("prototype")
public Encoder feignEncoder() {
return new SpringFormEncoder(new SpringEncoder(messageConverters));
}
@Bean
public feign.Logger.Level multipartLoggerLevel() {
return feign.Logger.Level.FULL;
}
}
④.外部服务的controller层调用
public class TestController extends BaseRestController {
@Autowired
FileClient client;
/**
* 上传文件
**/
@PostMapping(value = "/" , consumes = MULTIPART_FORM_DATA_VALUE)
public FileEntity save(@RequestPart(value = "file") MultipartFile file) throws IOException {
FileEntity fileEntity = client.save(file).getData();
return fileEntity;
}
}
到此位置就可以上传成功了
2、跨服务的文件下载
①.下载的接口（也是写在public interface FileClient），是用feign.Response来作为返回值的
/**
* 下载文件
* @param id
* @return
* @throws IOException
*/
@GetMapping(value = PREFIX_PATH + "/{id}/data")
Response download(@PathVariable("id") String id) throws IOException;
②.外部服务的controller层调用
/**
*由id下载存储的文件
*/
@GetMapping(value = "/{id}/data")
public void downloadFile(@PathVariable String id, HttpServletResponse servletResponse) throws IOException {
Response response = client.download(id);
Response.Body body = response.body();
for(Object key : response.headers().keySet()){
List<String> kList = (List)response.headers().get(key);
for(String val : kList){
servletResponse.setHeader(StringUtils.toString(key), val);
}
}
try(InputStream inputStream = body.asInputStream();
OutputStream outputStream = servletResponse.getOutputStream()
){
byte[] b = new byte[inputStream.available()];
inputStream.read(b);
outputStream.write(b);
outputStream.flush();
}catch (IOException e){
throw new RestException("IO流异常", e);
}
}
至此，下载文件完成。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
