Java经典代码片段——使用NIO进行快速的文件拷贝

     public static void fileCopy(File in, File out) throws IOException {
         FileChannel inChannel = new FileInputStream(in).getChannel();
         FileChannel outChannel = new FileOutputStream(out).getChannel();
         try {
             // inChannel.transferTo(0, inChannel.size(), outChannel); //
             // original – apparently has trouble copying large files on Windows
             // magic number for Windows, 64Mb - 32Kb)
             int maxCount = (64 * 1024 * 1024) - (32 * 1024);
             long size = inChannel.size();
             long position = 0;
             while (position < size) {
                 position += inChannel
                         .transferTo(position, maxCount, outChannel);
             }
         } finally {
             if (inChannel != null) {
                 inChannel.close();
             }
             if (outChannel != null) {
                 outChannel.close();
             }
         }
     }