MultipartFile multipartFile = new LocalMultipartFile(
byte[] fileContent = Files.readAllBytes(file.toPath());
System.out.println("接下来的代码将正常执行");
preparedStatement=conn.prepareStatement("select * from test;");
System.out.println("Perimeter: " + getPerimeter());
System.out.println("这是第 " + (i + 1) + " 次循环");