IO练习—复制文件

获取指定目录及子目录下所有txt文件的个数，并将这些txt文件复制到D盘下任意目录

public class Demo334 {

	public static void main(String[] args) throws IOException {
		File src = new File("F:\\fromFile");
		File des = new File("F:\\toFile");
		copyFile(src, des);
		System.out.println("文件复制已完成。");

	}

	private static void copyFile(File src, File des) throws IOException {
		for (File f : src.listFiles()) {
			if (f.isDirectory()) {
				copyFile(f, des);
			} else if (f.getName().endsWith(".txt")) {
				copyFileDetail(f, new File(des, f.getName()));
			}
		}
	}

	private static void copyFileDetail(File f, File file) throws IOException {
		// TODO Auto-generated method stub
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
		byte[] buffer = new byte[1024];
		int length = 0;
		while ((length = bis.read(buffer)) != -1) {
			bos.write(buffer, 0, length);
		}
		bis.close();
		bos.close();
	}

}