如何使用groovy上传图片？我的观点不是gsp，而是html css。我有以下html标记

import org.springframework.web.multipart.MultipartFile

@RestController
class UploadController {
  @PostMapping("/upload")
  def uploadFile(@RequestParam("image") MultipartFile file) {
    // 处理文件上传逻辑
    if (!file.isEmpty()) {
      // 获取文件名
      String fileName = file.getOriginalFilename()
      // 保存文件到指定路径
      file.transferTo(new File("/path/to/save/" + fileName))
      return "File uploaded successfully"
    } else {
      return "No file selected"
    }
  }
}

input[type="file"] {
  background-color: #f2f2f2;
  border: none;
  padding: 10px;
  font-size: 16px;
  font-family: Arial, sans-serif;
}