1、生成MD5

public static String get32MD5(String s) {		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };		try {			byte[] strTemp = s.getBytes();			MessageDigest mdTemp = MessageDigest.getInstance("MD5");			mdTemp.update(strTemp);			byte[] md = mdTemp.digest();			int j = md.length;			char str[] = new char[j * 2];			int k = 0;			for (int i = 0; i < j; i++) {				byte b = md[i];				str[k++] = hexDigits[b >> 4 & 0xf];				str[k++] = hexDigits[b & 0xf];			}			return new String(str);		} catch (Exception e) {			return "";		}	}

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