文件夹拷贝

File类递归练习(拷贝)
需求:3,从键盘接收两个文件夹路径,把其中一个文件夹中(包含内容)拷贝到另一个文件夹中

public class demo2 {
	public static void main(String[] args) throws FileNotFoundException, IOException{
		File srcFile = demo1.getDir();
		File dstFile = demo1.getDir();
		if(srcFile.equals(dstFile)){
			System.out.println("目标文件夹是源文件夹的子文件夹");
		}
		else{
			copyFile(srcFile, dstFile);
		}
	}
	public static File getDir(){
		System.out.println("请输入一个文件夹：");
		while(true){
			Scanner sc = new Scanner(System.in);
			 File file = new File(sc.nextLine());
			if(file.exists()){
				if(file.isFile()){
					continue;
				}
				else if(file.isDirectory()){
					return file;
				}
			}
		}
	}
	public static void copyFile(File src, File dst) throws FileNotFoundException, IOException{	
		File newDir = new File(dst, src.getName());
		newDir.mkdir();
		File[] subFiles = src.listFiles();
		for(File subFile:subFiles){
			if(subFile.isDirectory()){
				copyFile(subFile, newDir);
			}
			else{
				try(
						FileInputStream fis = new FileInputStream(subFile.getPath());
					    FileOutputStream fos = new FileOutputStream(new File(newDir , subFile.getName()));	
				){
					int len;
					byte[] arr = new byte[8192];   
					while((len = fis.read(arr)) != -1){
						fos.write(arr, 0, len);
					}
				}
			}
		}
	}
}