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打包出来的热更文件，如果每次都要全部上传到CDN文件服务器，不进耗费时间长，还浪费流量。
所以让AI写了个简单的文件比较工具类，然后修改了一下可用。记录一下。
路径可自行更改。校验算法这里使用的是MD5，如果使用SHA256校验，时间会长达1分钟，MD5只有5秒左右。一般用MD5即可。同步拷贝的写法时间太长，改为异步拷贝的写法，时间减半，只需30秒和3秒。（项目的热更文件67个，总大小在700M左右）
代码如下，放到Assets/Editor/路径下即可。
using System;
using System.IO;
using System.Security.Cryptography;
using System.Collections.Generic;
using System.Threading.Tasks;
using UnityEngine;
using UnityEditor;/// <summary>
/// 比较热更文件的差异 拷贝到另一个文件夹
/// </summary>
public class HotfixComparerAsync
{
#if UNITY_ANDROIDstatic string SourceFolder = Application.dataPath + "/../ServerData/Android"; // 源文件夹路径static string TargetFolder = Application.dataPath + "/../ServerData/Android_server"; // 目标文件夹路径static string OutputFolder = Application.dataPath + "/../ServerData/Android_hotfix"; // 输出文件夹路径，存放复制的文件
#endif
#if UNITY_IOSstatic string SourceFolder = Application.dataPath + "/../ServerData/iOS"; // 源文件夹路径static string TargetFolder = Application.dataPath + "/../ServerData/iOS_server"; // 目标文件夹路径static string OutputFolder = Application.dataPath + "/../ServerData/iOS_hotfix"; // 输出文件夹路径，存放复制的文件
#endif
#if UNITY_STANDALONE_WINstatic string SourceFolder = Application.dataPath + "/../ServerData/StandaloneWindows64"; // 源文件夹路径static string TargetFolder = Application.dataPath + "/../ServerData/StandaloneWindows64_server"; // 目标文件夹路径static string OutputFolder = Application.dataPath + "/../ServerData/StandaloneWindows64_hotfix"; // 输出文件夹路径，存放复制的文件
#endif[MenuItem("Tools/比较并拷贝热更文件Async")]public static void CompareAndCopyFiles(){DateTime startTime = DateTime.Now;if (!Directory.Exists(OutputFolder)){Directory.CreateDirectory(OutputFolder);}var sourceFiles = new HashSet<string>(Directory.GetFiles(SourceFolder, "*.*", SearchOption.AllDirectories));var targetFilesHashes = new Dictionary<string, string>();foreach (var file in Directory.GetFiles(TargetFolder, "*.*", SearchOption.AllDirectories)){string relativePath = MakeRelativePath(file, TargetFolder);targetFilesHashes[relativePath] = FileHash(file);}var tasks = new List<Task>();foreach (var sourceFile in sourceFiles){string relativePath = MakeRelativePath(sourceFile, SourceFolder);tasks.Add(Task.Run(() => ProcessFile(sourceFile, relativePath, targetFilesHashes)));}Task.WhenAll(tasks.ToArray()).Wait();TimeSpan diff = DateTime.Now - startTime;Debug.Log($"比较完成耗费：{diff.Minutes}分{diff.Seconds}秒");}private static void ProcessFile(string sourceFile, string relativePath, Dictionary<string, string> targetFilesHashes){if (targetFilesHashes.ContainsKey(relativePath)){string hash = FileHash(sourceFile);if (targetFilesHashes[relativePath] != hash){CopyFile(sourceFile, Path.Combine(OutputFolder, relativePath));}}else{CopyFile(sourceFile, Path.Combine(OutputFolder, relativePath));}}private static string MakeRelativePath(string path, string rootDirectory){return path.Substring(rootDirectory.Length + 1);}private static string FileHash(string file){using (var stream = File.OpenRead(file)){using (var hash = MD5.Create()){byte[] hashBytes = hash.ComputeHash(stream);return BitConverter.ToString(hashBytes).Replace("-", "").ToLowerInvariant();}}}private static void CopyFile(string sourceFile, string targetFile){//File.Copy(sourceFile, targetFile, true);// 获取目标文件的目录路径string targetDirectory = Path.GetDirectoryName(targetFile);// 如果目标目录不存在，则创建它if (!Directory.Exists(targetDirectory)){Directory.CreateDirectory(targetDirectory);}try{// 尝试复制文件File.Copy(sourceFile, targetFile, true);}catch (Exception e){// 处理可能的异常Debug.LogError($"Failed to copy file from {sourceFile} to {targetFile}. Error: {e.Message}");}}
}