public static string[] ShortUrl(string url)<br /> {<br /> //可以自定义生成MD5加密字符传前的混合KEY<br /> string key = “Leejor”;<br /> //要使用生成URL的字符<br /> string[] chars = new string[]{<br /> “a”,”b”,”c”,”d”,”e”,”f”,”g”,”h”,<br /> “i”,”j”,”k”,”l”,”m”,”n”,”o”,”p”,<br /> “q”,”r”,”s”,”t”,”u”,”v”,”w”,”x”,<br /> “y”,”z”,”0″,”1″,”2″,”3″,”4″,”5″,<br /> “6”,”7″,”8″,”9″,”A”,”B”,”C”,”D”,<br /> “E”,”F”,”G”,”H”,”I”,”J”,”K”,”L”,<br /> “M”,”N”,”O”,”P”,”Q”,”R”,”S”,”T”,<br /> “U”,”V”,”W”,”X”,”Y”,”Z”<br /> };</p> <p> //对传入网址进行MD5加密<br /> string hex = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(key + url, “md5”);</p> <p> string[] resUrl = new string[4];</p> <p> for (int i = 0; i < 4; i++)<br /> {<br /> //把加密字符按照8位一组16进制与0x3FFFFFFF进行位与运算<br /> int hexint = 0x3FFFFFFF & Convert.ToInt32(“0x” + hex.Substring(i * 8, 8), 16);<br /> string outChars = string.Empty;<br /> for (int j = 0; j < 6; j++)<br /> {<br /> //把得到的值与0x0000003D进行位与运算，取得字符数组chars索引<br /> int index = 0x0000003D & hexint;<br /> //把取得的字符相加<br /> outChars += chars[index];<br /> //每次循环按位右移5位<br /> hexint = hexint >> 5;<br /> }<br /> //把字符串存入对应索引的输出数组<br /> resUrl[i] = outChars;<br /> }<br /> return resUrl;<br /> }

test：

ShortUrl(http://www.me3.cn)[0]; //得到值fAVfui<br /> ShortUrl(http://www.me3.cn)[1]; //得到值3ayQry<br /> ShortUrl(http://www.me3.cn)[2]; //得到值UZzyUr<br /> ShortUrl(http://www.me3.cn)[3]; //得到值36rQZn