小优化

src/main/java/org/mcdcl/launcher/GameLauncher.java

@@ -213,4 +213,13 @@ public void stopGame() {
      public boolean isRunning() {
          return gameProcess != null && gameProcess.isAlive();
      }
- }
+ }
+
+// 在launchGame方法中添加更多的预检查
+// 例如检查磁盘空间是否足够
+File minecraftFolder = minecraftDir.getRoot();
+long freeSpace = minecraftFolder.getFreeSpace();
+long requiredSpace = 200 * 1024 * 1024; // 假设需要200MB空间
+if (freeSpace < requiredSpace) {
+    throw new LaunchException("磁盘空间不足，至少需要" + (requiredSpace / (1024 * 1024)) + "MB可用空间");
+}

src/main/java/org/mcdcl/ui/ErrorView.java

@@ -101,6 +101,20 @@ private void initUI() {
             scrollPane
         );
 
+        // 在initUI方法中添加常见问题解决建议
+        Label helpLabel = new Label("常见解决方法：");
+        helpLabel.setFont(Font.font("System", FontWeight.BOLD, 14));
+
+        VBox helpBox = new VBox(5);
+        helpBox.getChildren().addAll(
+            new Label("1. 检查Java版本是否与游戏版本兼容"),
+            new Label("2. 确保网络连接正常"),
+            new Label("3. 检查是否有足够的磁盘空间"),
+            new Label("4. 尝试重新下载游戏文件")
+        );
+
+        // 将帮助信息添加到界面
+        centerBox.getChildren().addAll(helpLabel, helpBox);
         setTop(topBox);
         setCenter(centerBox);
         setBottom(buttonBox);
@@ -116,4 +130,4 @@ private String getStackTraceAsString(Throwable throwable) {
         throwable.printStackTrace(pw);
         return sw.toString();
     }
-}
+}

src/main/java/org/mcdcl/ui/MultiplayerView.java

@@ -345,9 +345,36 @@ private String generateRandomKey() {
     }
 
     private boolean validateKey(String key) {
-        // 简单验证密钥格式
-        return key != null && key.length() == 16 && 
-               key.matches("^[a-zA-Z0-9]+$");
+        // 更强的密钥验证
+        if (key == null || key.isEmpty()) {
+            return false;
+        }
+
+        // 检查长度
+        if (key.length() < 16 || key.length() > 32) {
+            return false;
+        }
+
+        // 检查格式 - 要求包含字母和数字的组合
+        boolean hasLetter = false;
+        boolean hasDigit = false;
+
+        for (char c : key.toCharArray()) {
+            if (Character.isLetter(c)) {
+                hasLetter = true;
+            } else if (Character.isDigit(c)) {
+                hasDigit = true;
+            } else if (!Character.isLetterOrDigit(c)) {
+                // 不允许特殊字符
+                return false;
+            }
+
+            if (hasLetter && hasDigit) {
+                break;
+            }
+        }
+
+        return hasLetter && hasDigit;
     }
 
     private String establishP2PConnection(String key) throws Exception {
@@ -374,4 +401,4 @@ private void joinSelectedServer() {
             mainView.showAlert("未选择服务器", "请先从列表中选择一个服务器");
         }
     }
-}
+}

src/main/java/org/mcdcl/util/ResourcePackManager.java

@@ -34,15 +34,50 @@ public static void downloadResourcePack(String packName, Consumer<Double> progre
             // 确保目录存在
             resourcePackDir.mkdirs();
 
-            // TODO: 实现实际的资源包下载逻辑
-            // 这里暂时使用模拟下载
-            for (double progress = 0; progress <= 1; progress += 0.1) {
-                Thread.sleep(500);
-                progressCallback.accept(progress);
+            // 查找资源包下载链接
+            URL url = new URL(RESOURCE_PACK_API);
+            JSONObject json = new JSONObject(new String(url.openStream().readAllBytes()));
+            JSONArray hits = json.getJSONArray("hits");
+
+            String downloadUrl = null;
+            for (int i = 0; i < hits.length(); i++) {
+                JSONObject pack = hits.getJSONObject(i);
+                if (pack.getString("title").equals(packName)) {
+                    // 假设API返回的结构中包含下载链接
+                    downloadUrl = pack.getString("download_url");
+                    break;
+                }
+            }
+
+            if (downloadUrl == null) {
+                throw new IOException("找不到资源包: " + packName);
             }
 
+            // 执行下载
+            URL packUrl = new URL(downloadUrl);
+            String fileName = packName.replaceAll("[^a-zA-Z0-9.-]", "_") + ".zip";
+            File outputFile = new File(resourcePackDir, fileName);
+
+            try (InputStream in = packUrl.openStream();
+                 FileOutputStream out = new FileOutputStream(outputFile)) {
+
+                byte[] buffer = new byte[8192];
+                long totalBytes = 0;
+                int bytesRead;
+                long fileSize = packUrl.openConnection().getContentLengthLong();
+
+                while ((bytesRead = in.read(buffer)) != -1) {
+                    out.write(buffer, 0, bytesRead);
+                    totalBytes += bytesRead;
+
+                    if (fileSize > 0) {
+                        double progress = (double) totalBytes / fileSize;
+                        progressCallback.accept(progress);
+                    }
+                }
+            }
         } catch (Exception e) {
-            throw new IOException("下载资源包失败: " + e.getMessage());
+            throw new IOException("下载资源包失败: " + e.getMessage(), e);
         }
     }
-}
+}