JAVA功能代码《12》----使用NIO快速复制文件

最新推荐文章于 2024-01-13 22:01:36 发布

最新推荐文章于 2024-01-13 22:01:36 发布 · 384 阅读

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#java

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(); } } }