byte[] digest = MessageDigest.getInstance("MD5").digest("The String");
	StringBuilder sb = new StringBuilder();
	// transform into hex
	for (byte b : digest) {
		sb.append(String.format("%02x", b));
	}
	String token = sb.toString();

String.format(String format, Object... args)

%[argument_index$][flags][width][.precision]conversion

• argument_index: Optional. Is a decimal integer indicating the position of the argument in the argument list. The first argument is referenced by “1$”, the second by “2$”, etc.
• flags: Optional. Is a set of characters that modify the output format. The set of valid flags depends on the conversion. If shorter than width, fill with flags.
• width: Optional. Is a positive decimal integer indicating the minimum number of characters to be written to the output.
• precision: Optional. Is a non-negative decimal integer usually used to restrict the number of characters. The specific behavior depends on the conversion.
• conversion: Required. Is a character indicating how the argument should be formatted. The set of valid conversions for a given argument depends on the argument’s data type. x means hexadecimal format.