Fileとbyte[]変換

public static byte[] File2byte(String filePath)
	{
		byte[] buffer = null;
		try
		{
			File file = new File(filePath);
			FileInputStream fis = new FileInputStream(file);
			ByteArrayOutputStream bos = new ByteArrayOutputStream();
			byte[] b = new byte[1024];
			int n;
			while ((n = fis.read(b)) != -1)
			{
				bos.write(b, 0, n);
			}
			fis.close();
			bos.close();
			buffer = bos.toByteArray();
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		return buffer;
	}

	public static void byte2File(byte[] buf, String filePath, String fileName)
	{
		BufferedOutputStream bos = null;
		FileOutputStream fos = null;
		File file = null;
		try
		{
			File dir = new File(filePath);
			if (!dir.exists() && dir.isDirectory())
			{
				dir.mkdirs();
			}
			file = new File(filePath + File.separator + fileName);
			fos = new FileOutputStream(file);
			bos = new BufferedOutputStream(fos);
			bos.write(buf);
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
		finally
		{
			if (bos != null)
			{
				try
				{
					bos.close();
				}
				catch (IOException e)
				{
					e.printStackTrace();
				}
			}
			if (fos != null)
			{
				try
				{
					fos.close();
				}
				catch (IOException e)
				{
					e.printStackTrace();
				}
			}
		}
	}