解释游戏这这个代码,还有分析一下这个获取的路径各种状态下的不同

Question

@PostMapping("/upload")
public Result upload(MultipartFile file, HttpServletRequest request) throws IOException {
InputStream inputStream = file.getInputStream();
byte[] bytes = file.getBytes();
String originalFilename = file.getOriginalFilename();
String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
String s = UUID.randomUUID().toString();//user.jpg ==> FASDFADSF4783FIDF.jpg
String fileName = s+substring;
String realPath = request.getServletContext().getRealPath("/images");//
file.transferTo(new File(realPath,fileName));
return new Result(Code.UPDATE_OK,"/images/"+fileName,"文件上传成功");

Answer 1

@PostMapping("/upload")
    public Result upload(MultipartFile file, HttpServletRequest request) throws IOException {
        InputStream inputStream = file.getInputStream();//获取文件流对象
        byte[] bytes = file.getBytes();//获取二进制
        String originalFilename = file.getOriginalFilename();//获取文件名
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));//获取文件后缀，如：txt、jpg等
        String s = UUID.randomUUID().toString();//user.jpg ==> FASDFADSF4783FIDF.jpg  //生成UUID
        String fileName = s+substring;//拼接成新的文件名
        String realPath = request.getServletContext().getRealPath("/images");//获取当前项目部署目录下的路径
        file.transferTo(new File(realPath,fileName));//实现上传
        return new Result(Code.UPDATE_OK,"/images/"+fileName,"文件上传成功");
}