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HMCLCore/src/main/java/org/jackhuang/hmcl/task/DownloadException.java

@@ -0,0 +1,36 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2018  huangyuhui <huanghongxun2008@126.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.task;
+
+import java.io.IOException;
+import java.net.URL;
+
+public class DownloadException extends IOException {
+
+    private final URL url;
+
+    public DownloadException(URL url, Throwable cause) {
+        super("Unable to download " + url + ", " + cause.getMessage(), cause);
+
+        this.url = url;
+    }
+
+    public URL getUrl() {
+        return url;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/task/FileDownloadTask.java

@@ -19,7 +19,8 @@ package org.jackhuang.hmcl.task;
 
 import org.jackhuang.hmcl.event.EventManager;
 import org.jackhuang.hmcl.event.FailedEvent;
-import org.jackhuang.hmcl.util.*;
+import org.jackhuang.hmcl.util.CacheRepository;
+import org.jackhuang.hmcl.util.Logging;
 import org.jackhuang.hmcl.util.io.ChecksumMismatchException;
 import org.jackhuang.hmcl.util.io.FileUtils;
 import org.jackhuang.hmcl.util.io.IOUtils;
@@ -328,7 +329,7 @@ public class FileDownloadTask extends Task {
         }
 
         if (exception != null)
-            throw new IOException("Unable to download file " + currentURL + ". " + exception.getMessage(), exception);
+            throw new DownloadException(currentURL, exception);
     }
 
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/task/GetTask.java

@@ -29,7 +29,6 @@ import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.nio.charset.Charset;
-import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.logging.Level;
 
@@ -141,7 +140,7 @@ public final class GetTask extends TaskResult<String> {
             }
         }
         if (exception != null)
-            throw exception;
+            throw new DownloadException(url, exception);
     }
 
     /**