IO字节流复制文件

1.

                FileInputStream fis = new FileInputStream("E:\\学习\\Java\\黑马程序员_张孝祥_Java高新技术\\观看帮助.txt");
		FileOutputStream fos = new FileOutputStream("fos.txt");
		int by = 0;
		while((by=fis.read())!=-1){
			fos.write(by);
		}
		fis.close();
		fos.close();

2.

                FileInputStream fis = new FileInputStream("E:\\学习\\Java\\黑马程序员_张孝祥_Java高新技术\\观看帮助.txt");
		FileOutputStream fos = new FileOutputStream("fos.txt");
		byte[] b = new byte[1024];
		int len = 0;
		while((len = fis.read(b))!=-1){
			fos.write(b, 0, len);
		}
		fis.close();
		fos.close();