删除文件上传时的文件扩展名

import os

filename = "example.txt"
new_filename = os.path.splitext(filename)[0]

os.rename(filename, new_filename)

const fs = require("fs");
const path = require("path");

const filename = "example.txt";
const newFilename = path.basename(filename, path.extname(filename));

fs.rename(filename, newFilename, (err) => {
  if (err) throw err;
});

import java.io.File;

public class Main {
  public static void main(String[] args) {
    File file = new File("example.txt");
    String newFilename = file.getName().substring(0, file.getName().lastIndexOf("."));
    file.renameTo(new File(newFilename));
  }
}

$filename = "example.txt";
$newFilename = basename($filename, pathinfo($filename, PATHINFO_EXTENSION));

rename($filename, $newFilename);

using System.IO;

string filename = "example.txt";
string newFilename = Path.GetFileNameWithoutExtension(filename);

File.Move(filename, newFilename);

filename = "example.txt"
new_filename = File.basename(filename, File.extname(filename))

File.rename(filename, new_filename)