java读取文件

public static void main(String[] args)
	{
		File file = new File("D:\\zhangming\\id_rsa.pub");
		FileReader fileReader = null;
		String test = "";
		byte[] bs =null;
		
		//=========按Byte读取，读取字节文件
		try
		{
			FileInputStream fileInputStream = new FileInputStream(file);
			bs= new byte[2048];
			while (fileInputStream.read() != -1)
			{
				fileInputStream.read(bs);
			}
		}
		catch (FileNotFoundException e1)
		{
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		catch (IOException e1)
		{
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		System.out.println("。。。。。。。" + bs.length);
		test = new String(bs);
		System.out.println("===========================================");
		System.out.println(test);
		System.out.println("===========================================");
		
		//==========读取字符文件=========
		try
		{
			fileReader = new FileReader(file);
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}

		BufferedReader reader = new BufferedReader(fileReader);
		StringBuffer buffer = new StringBuffer();
		String temp = null;
		try
		{
			while ((temp = reader.readLine()) != null)
			{
				buffer.append(temp);

			}
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		System.out.println(buffer.toString());

		System.out.println("MD5  fingerprint:\n");
		try
		{
			System.out.println(md5Digest(bs));
		}
		catch (NoSuchAlgorithmException e)
		{
			e.printStackTrace();
		}

		System.out.println("sha1 fingerprint:\n");
		try
		{
			System.out.println(sha_1Digest(bs));
		}
		catch (NoSuchAlgorithmException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static String md5Digest(byte[] messageByte)
			throws NoSuchAlgorithmException
	{
		MessageDigest digestmds = MessageDigest.getInstance("md5");
		digestmds.update(messageByte);
		byte[] digesta = digestmds.digest();
		return byte2hex(digesta);
	}

	/**
	 * @param messageByte
	 * @return
	 * @throws NoSuchAlgorithmException
	 */
	public static String sha_1Digest(byte[] messageByte)
			throws NoSuchAlgorithmException
	{
		MessageDigest digestmds = MessageDigest.getInstance("SHA-1");
		digestmds.update(messageByte);
		byte[] digesta = digestmds.digest();
		return byte2hex(digesta);
	}

	/**
	 * 二行制转字符串
	 * 
	 * @param b
	 * @return String
	 */
	public static String byte2hex(byte[] b) // 二行制转字符串
	{
		String hs = "";
		String stmp = "";
		for (int n = 0; n < b.length; n++)
		{
			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
			if (stmp.length() == 1)
				hs = hs + "0" + stmp;
			else
				hs = hs + stmp;
			if (n < b.length - 1)
				hs = hs + ":";
		}
		return hs.toLowerCase(Locale.getDefault());
	}