利用File类和IO流将一个文件夹的所有内容拷贝到另一个文件夹下

class hello {

	public static void main(String[] args) throws IOException {
		File one = Dir();
		File two = Dir();
		if(one.equals(two)) {
				System.out.println("目标文件是源文件夹的子文件夹");
			}else {
				Copy(one,two);
			}
		
	}

	public static void Copy(File one , File two) throws IOException {
		File toDir = new File(two,one.getName());//获取目标文件夹的目录
		
		toDir.mkdir();//在目标文件夹目录下新建与源文件夹相同名字的文件夹
		File[] files = one.listFiles();
		for (File file : files) {
			if(file.isFile()) {
				BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
				BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(toDir,file.getName())));
				int a;
				if((a = bis.read()) != -1){
					bos.write(a);
				}
				bis.close();
				bos.close();
			}else {
				Copy(file, toDir);
			}
		}
	}
	
	public static File Dir() {//获取文件夹路径方法
		System.out.println("请输入文件夹路径:");
		Scanner sc