添加查看jre

Program.cs

@@ -3,6 +3,7 @@ using System.Threading.Tasks;
 using MCSJ.Tools;
 using MCSJ.Tools.LogSystem;
 using MCSJ.Tools.JreDownload;
+using MCSJ.Tools.ViewJre;
 
 namespace MCSJ
 {
@@ -22,6 +23,7 @@ namespace MCSJ
             };
             var versionManager = new VersionManager();
             var downloadService = new DownloadService(versionManager);
+            var jreViewer = new JreViewer();
             LogMain.Debug("服务初始化完成");
             
             while (true)
@@ -30,7 +32,8 @@ namespace MCSJ
                 Console.WriteLine("1. 显示所有版本");
                 Console.WriteLine("2. 下载指定版本");
                 Console.WriteLine("3. 下载JRE");
-                Console.WriteLine("4. 退出");
+                Console.WriteLine("4. 查看已安装的JRE");
+                Console.WriteLine("5. 退出");
                 Console.Write("请选择操作: ");
                 
                 var input = Console.ReadLine();
@@ -63,6 +66,10 @@ namespace MCSJ
                         LogMain.Info($"JRE下载完成: {jreVersion}");
                         break;
                     case "4":
+                        jreViewer.DisplayInstalledJres();
+                        LogMain.Info("显示已安装的JRE列表");
+                        break;
+                    case "5":
                         LogMain.Info("程序正常退出");
                         return;
                     default:

Tools/viewjre/JreViewer.cs

@@ -0,0 +1,48 @@
+using System;
+using System.IO;
+using System.Linq;
+
+namespace MCSJ.Tools.ViewJre
+{
+    public class JreViewer
+    {
+        private const string SetupFolder = "setup";
+        private const string JreTomlFile = "jre.toml";
+
+        public void DisplayInstalledJres()
+        {
+            var tomlPath = Path.Combine(SetupFolder, JreTomlFile);
+            
+            if (!File.Exists(tomlPath))
+            {
+                Console.WriteLine("没有安装任何JRE");
+                return;
+            }
+
+            try
+            {
+                var content = File.ReadAllText(tomlPath);
+                var versions = content.Split('\n')
+                    .Where(line => line.StartsWith("[jre."))
+                    .Select(line => line.Split('.')[1].Split(']')[0].Trim()) // 精确提取版本号
+                    .ToList();
+
+                if (versions.Count == 0)
+                {
+                    Console.WriteLine("没有安装任何JRE");
+                    return;
+                }
+
+                Console.WriteLine("已安装的JRE版本:");
+                foreach (var version in versions)
+                {
+                    Console.WriteLine(version); // 直接输出版本号，不带前缀
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"读取JRE列表失败: {ex.Message}");
+            }
+        }
+    }
+}