问题记录

• A服务（服务提供者）提供文件下载接口
• B服务（服务消费者）通过Feign请求拿到文件

@GetMapping(value = "/file/{fileName}")
public void downFile(@PathVariable("fileName") String fileName, HttpServletResponse response) {
  // 返回一个文件流
}

• Feign客户端

@FeignClient("consume-file")
public interface FileFeignClient {
 
    @GetMapping(value = "/file/{fileName}")
    Response downFile(@PathVariable("fileName") String fileName);
}

• 响应给前端

private final FileFeignClient fileFeignClient;

@GetMapping(value = "down/{fileName}")
public void down(@PathVariable("fileName") String fileName, HttpServletResponse response){
    Response responseFile =  fileFeignClient.downFile(fileName);
    InputStream inputStream = responseFile.body().asInputStream();
    // TODO设置响应头及响应文件名称

    IOUtils.copy(inputStream,response.getOutputStream());
}