字节缓冲流BufferedOutputStream写出数据

//public BufferedOutputStream(OutputStream out):
		//第一种
//		FileOutputStream fos=new FileOutputStream("c.txt");
//		BufferedOutputStream bos=new BufferedOutputStream(fos);
		//等同于下面这个
		BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("c.txt"));
		//写入数据 
		bos.write("hello".getBytes());
		//释放资源
		bos.close();