MD5加密

public class MD5Util {
	/*
	 * MD5加密
	 */
	public static String getDigest(String str) {
		MessageDigest messageDigest = null;

		try {
			messageDigest = MessageDigest.getInstance("MD5");
			messageDigest.reset();
			messageDigest.update(str.getBytes("UTF-8"));
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}

		byte[] byteArray = messageDigest.digest();
		StringBuffer md5StrBuff = new StringBuffer();

		for (int i = 0; i < byteArray.length; i++) {
			if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
				md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
			else
				md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
		}
		return md5StrBuff.toString().toUpperCase();
	}
	
	public static void main(String []args) {
		String info = "My chinese name is Mr.Z ! 哈哈";
		System.out.println(getDigest(info));
	}
}