实现下载列表中版本的功能

MCSJ.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="resources\**">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
+</Project>

Program.cs

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+using System;
+using System.Threading.Tasks;
+using MCSJ.Tools;
+
+namespace MCSJ
+{
+    class Program
+    {
+        static async Task Main(string[] args)
+        {
+            var versionManager = new VersionManager();
+            var downloadService = new DownloadService(versionManager);
+            
+            while (true)
+            {
+                Console.WriteLine("MC服务器下载工具");
+                Console.WriteLine("1. 显示所有版本");
+                Console.WriteLine("2. 下载指定版本");
+                Console.WriteLine("3. 退出");
+                Console.Write("请选择操作: ");
+                
+                var input = Console.ReadLine();
+                
+                switch (input)
+                {
+                    case "1":
+                        versionManager.DisplayAllVersions();
+                        break;
+                    case "2":
+                        Console.Write("请输入要下载的版本名称: ");
+                        var version = Console.ReadLine();
+                        await downloadService.DownloadVersion(version);
+                        break;
+                    case "3":
+                        return;
+                    default:
+                        Console.WriteLine("无效输入，请重新选择");
+                        break;
+                }
+                
+                Console.WriteLine();
+            }
+        }
+    }
+}

Tools/DownloadService.cs

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+using System;
+using System.IO;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace MCSJ.Tools
+{
+    public class DownloadService
+    {
+        private readonly VersionManager _versionManager;
+        private readonly HttpClient _httpClient;
+
+        public DownloadService(VersionManager versionManager)
+        {
+            _versionManager = versionManager;
+            _httpClient = new HttpClient();
+        }
+
+        public async Task DownloadVersion(string version)
+        {
+            var url = _versionManager.GetDownloadUrl(version);
+            if (url == null)
+            {
+                Console.WriteLine($"版本 {version} 不存在");
+                return;
+            }
+
+            try
+            {
+                Console.WriteLine($"开始下载 {version}...");
+                
+                var response = await _httpClient.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
+                response.EnsureSuccessStatusCode();
+
+                var totalBytes = response.Content.Headers.ContentLength ?? -1;
+                var downloadedBytes = 0L;
+                var buffer = new byte[8192];
+                var isMoreToRead = true;
+
+                using (var stream = await response.Content.ReadAsStreamAsync())
+                using (var fileStream = new FileStream($"{version}.jar", FileMode.Create, FileAccess.Write))
+                {
+                    while (isMoreToRead)
+                    {
+                        var read = await stream.ReadAsync(buffer, 0, buffer.Length);
+                        if (read == 0)
+                        {
+                            isMoreToRead = false;
+                        }
+                        else
+                        {
+                            await fileStream.WriteAsync(buffer, 0, read);
+
+                            downloadedBytes += read;
+                            if (totalBytes > 0)
+                            {
+                                var progress = (double)downloadedBytes / totalBytes * 100;
+                                Console.Write($"\r下载进度: {progress:F2}%");
+                            }
+                        }
+                    }
+                }
+
+                Console.WriteLine($"\n{version} 下载完成!");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"下载失败: {ex.Message}");
+            }
+        }
+    }
+}

Tools/VersionManager.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace MCSJ.Tools
+{
+    public class VersionManager
+    {
+        private readonly Dictionary<string, string> _versions = new();
+
+        public VersionManager()
+        {
+            LoadVersions();
+        }
+
+        private void LoadVersions()
+        {
+            try
+            {
+                var filePath = Path.Combine("resources", "serverlist.txt");
+                Console.WriteLine($"尝试从路径加载版本列表: {Path.GetFullPath(filePath)}");
+                
+                if (!File.Exists(filePath))
+                {
+                    throw new FileNotFoundException($"服务器列表文件不存在: {filePath}");
+                }
+
+                var content = File.ReadAllText(filePath);
+                var entries = content.Split(new[] {' ', '\n', '\r'}, StringSplitOptions.RemoveEmptyEntries);
+                
+                foreach (var entry in entries)
+                {
+                    var colonIndex = entry.IndexOf(':');
+                    if (colonIndex > 0 && colonIndex < entry.Length - 1)
+                    {
+                        var version = entry.Substring(0, colonIndex);
+                        var url = entry.Substring(colonIndex + 1);
+                        _versions[version] = url;
+                    }
+                    else
+                    {
+                        Console.WriteLine($"忽略无效条目: {entry} (缺少冒号分隔或格式不正确)");
+                    }
+                }
+                
+                if (_versions.Count == 0)
+                {
+                    throw new Exception("没有找到有效的版本条目");
+                }
+                
+                Console.WriteLine($"成功加载 {_versions.Count} 个版本");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"加载版本列表失败: {ex.Message}");
+                Console.WriteLine($"当前工作目录: {Directory.GetCurrentDirectory()}");
+                Console.WriteLine("请确保serverlist.txt格式为: 版本名:下载URL (每行一个或空格分隔)");
+            }
+        }
+
+        public void DisplayAllVersions()
+        {
+            Console.WriteLine("可用版本列表:");
+            foreach (var version in _versions.Keys)
+            {
+                Console.WriteLine(version);
+            }
+        }
+
+        public string GetDownloadUrl(string version)
+        {
+            return _versions.TryGetValue(version, out var url) ? url : null;
+        }
+    }
+}

resources/serverlist.txt

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+vanilla1.21.10:https://file.mslmc.cn/mirrors/vanilla/95495a7f485eedd84ce928cef5e223b757d2f764/server.jar
+vanilla1.21.9:https://file.mslmc.cn/mirrors/vanilla/11e54c2081420a4d49db3007e66c80a22579ff2a/server.jar
+vanilla1.21.8:https://file.mslmc.cn/mirrors/vanilla/6bce4ef400e4efaa63a13d5e6f6b500be969ef81/server.jar
+vanilla1.21.7:https://file.mslmc.cn/mirrors/vanilla/05e4b48fbc01f0385adb74bcff9751d34552486c/server.jar
+vanilla1.21.6:https://file.mslmc.cn/mirrors/vanilla/6e64dcabba3c01a7271b4fa6bd898483b794c59b/server.jar