Java MD5 加密

MessageDigest md5 = null;
			try {
				md5 = MessageDigest.getInstance("MD5");
			} catch (Exception e) {
				System.out.println(e.toString());
				e.printStackTrace();
				return "";
			}

			byte[] by = str.getBytes();
			byte[] md5Bytes = md5.digest(by);

			StringBuffer hexValue = new StringBuffer();
			for (int i = 0; i < md5Bytes.length; i++) {
				int val = ((int) md5Bytes[i]) & 0xff;
				if (val < 16)
					hexValue.append("0");
				hexValue.append(Integer.toHexString(val));
			}

			return hexValue.toString();

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