/**
	 * 复制一个目录及其子目录、文件到另外一个目录
	 * @param src
	 * @param dest
	 * @throws IOException
	 */
	private void copyFolder(File src, File dest) throws IOException {
		if (src.isDirectory()) {
			if (!dest.exists()) {
				dest.mkdir();
			}
			String files[] = src.list();
			for (String file : files) {
				File srcFile = new File(src, file);
				File destFile = new File(dest, file);
				// 递归复制
				copyFolder(srcFile, destFile);
			}
		} else {
			InputStream in = new FileInputStream(src);
			OutputStream out = new FileOutputStream(dest);

			byte[] buffer = new byte[1024];

			int length;
			
			while ((length = in.read(buffer)) > 0) {
				out.write(buffer, 0, length);
			}
			in.close();
			out.close();
		}
	}

PS： apache commons-io包，FileUtils有相关的方法，IOUtils一般是拷贝文件。

删除目录结构                    FileUtils.deleteDirectory(dest);

递归复制目录及文件        FileUtils.copyDirectory(src, dest);