12.使用NIO快速复制文件
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(); } } }
