利用Spring Boot怎么样实现一个图片上传功能

package com.clou.inteface.domain.web.user;import java.io.File;import java.io.IOException;import java.util.HashMap;import java.util.Map;import org.apache.commons.lang3.StringUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.http.MediaType;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.multipart.MultipartFile;@RestControllerpublic class FileUpload {   @Autowired private SUserService sUserService;   @Value("${web.upload-path}") private String webUploadPath;    @PostMapping(value = "/fileUpload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE) public ResultVo fileUpload(@RequestParam("file") MultipartFile file, @RequestParam("userId") Integer userId) { ResultVo resultVo = new ResultVo(); if (!file.isEmpty()) { if (file.getContentType().contains("image")) { try {  String temp = "images" + File.separator + "upload" + File.separator;  // 获取图片的文件名  String fileName = file.getOriginalFilename();  // 获取图片的扩展名  String extensionName = StringUtils.substringAfter(fileName, ".");  // 新的图片文件名 = 获取时间戳+"."图片扩展名  String newFileName = String.valueOf(System.currentTimeMillis()) + "." + extensionName;  // 数据库保存的目录  String datdDirectory = temp.concat(String.valueOf(userId)).concat(File.separator);  // 文件路径  String filePath = webUploadPath.concat(datdDirectory);  File dest = new File(filePath, newFileName);  if (!dest.getParentFile().exists()) {  dest.getParentFile().mkdirs();  }  // 判断是否有旧头像，如果有就先删除旧头像，再上传  SUser userInfo = sUserService.findUserInfo(userId.toString());  if (StringUtils.isNotBlank(userInfo.getUserHead())) {  String oldFilePath = webUploadPath.concat(userInfo.getUserHead());  File oldFile = new File(oldFilePath);  if (oldFile.exists()) {  oldFile.delete();  }  }  // 上传到指定目录  file.transferTo(dest);  // 将图片流转换进行BASE64加码  //BASE64Encoder encoder = new BASE64Encoder();  //String data = encoder.encode(file.getBytes());  // 将反斜杠转换为正斜杠  String data = datdDirectory.replaceAll("\\\\", "/") + newFileName;  Map<String, Object> resultMap = new HashMap<>();  resultMap.put("file", data);  resultVo.setData(resultMap);  resultVo.setError(1, "上传成功!"); } catch (IOException e) {  resultVo.setError(0, "上传失败!"); } } else { resultVo.setError(0, "上传的文件不是图片类型，请重新上传!"); } return resultVo; } else { resultVo.setError(0, "上传失败，请选择要上传的图片!"); return resultVo; } }}