MultipartFile转换为File

public String infornationshow(@RequestParam(value = "file", required = false) MultipartFile file,HttpServletRequest request,HttpServletResponse response) throws IOException{

     File f = null;
            if(file.equals("")||file.getSize()<=0){
                file = null;
            }else{
                InputStream ins = file.getInputStream();
                f=new File(file.getOriginalFilename());
                inputStreamToFile(ins, f);
            }

 public static void inputStreamToFile(InputStream ins,File file) {
          try {
           OutputStream os = new FileOutputStream(file);
           int bytesRead = 0;
           byte[] buffer = new byte[8192];
           while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
            os.write(buffer, 0, bytesRead);
           }
           os.close();
           ins.close();
          } catch (Exception e) {
           e.printStackTrace();
          }
         }

但这种办法会出现一个问题，会在项目目录下自动生成一个临时的file文件，如何将这个文件删除呢？

File del = new File(f.toURI());
            del.delete();