code: public static String MD5EncodeToNum(String str) {
  		String reStr = null;
  		try {
  			reStr = new String(str);
  			MessageDigest md = MessageDigest.getInstance("MD5");
  			reStr = byteArrayToNumString(md.digest(reStr.getBytes()));
  		} catch (Exception e) {
  		}
  		return reStr;
  	}
docs: 把字符串加密成十进制表示形式
  
  @param str
  字符串
  @return 十进制表示的字符串