SpringBoot实现本地存储文件上传及提供HTTP访问服务的方法

web:
 upload-path: D:/data/

spring:
 resources:
 static-locations: classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/,file:${web.upload-path}

@RestController
public class FileUploadController {

 //绑定文件上传路径到uploadPath
 @Value("${web.upload-path}")
 private String uploadPath;
 
 SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd/");
 
 @PostMapping("/upload")
 public String upload(MultipartFile uploadFile,
    HttpServletRequest request) {

 // 在 uploadPath 文件夹中通过日期对上传的文件归类保存
 // 比如：/2019/06/06/cf13891e-4b95-4000-81eb-b6d70ae44930.png
 String format = sdf.format(new Date());
 File folder = new File(uploadPath + format);
 if (!folder.isDirectory()) {
  folder.mkdirs();
 }
 
 // 对上传的文件重命名，避免文件重名
 String oldName = uploadFile.getOriginalFilename();
 String newName = UUID.randomUUID().toString()
  + oldName.substring(oldName.lastIndexOf("."), oldName.length());
 try {
  // 文件保存
  uploadFile.transferTo(new File(folder, newName));
 
  // 返回上传文件的访问路径
  String filePath = request.getScheme() + "://" + request.getServerName()
   + ":" + request.getServerPort() + format + newName;
  return filePath;
 } catch (IOException e) {
  throw new CustomException(CustomExceptionType.SYSTEM_ERROR);
 }

 }
}