微博短网址(ShortUrl)算法代码,CSharp代码库,德仔网

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【CSharp】微博短网址(ShortUrl)算法

作者:Dezai.CN / 发布于2013/10/24/ 533


	Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->public static string[] ShortUrl(string url)
	 {
	 //可以自定义生成MD5加密字符传前的混合KEY
	 string key = "Leejor";
	 //要使用生成URL的字符
	 string[] chars = new string[]{
	 "a","b","c","d","e","f","g","h",
	 "i","j","k","l","m","n","o","p",
	 "q","r","s","t","u","v","w","x",
	 "y","z","0","1","2","3","4","5",
	 "6","7","8","9","A","B","C","D",
	 "E","F","G","H","I","J","K","L",
	 "M","N","O","P","Q","R","S","T",
	 "U","V","W","X","Y","Z"

	 };
	 //对传入网址进行MD5加密
	 string hex = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(key + url, "md5");

	 string[] resUrl = new string[4];

	 for (int i = 0; i < 4; i++)
	 {
	 //把加密字符按照8位一组16进制与0x3FFFFFFF进行位与运算
	 int hexint = 0x3FFFFFFF & Convert.ToInt32("0x" + hex.Substring(i * 8, 8), 16);
	 string outChars = string.Empty;
	 for (int j = 0; j < 6; j++)
	 {
	 //把得到的值与0x0000003D进行位与运算，取得字符数组chars索引
	 int index = 0x0000003D & hexint;
	 //把取得的字符相加
	 outChars += chars[index];
	 //每次循环按位右移5位
	 hexint = hexint >> 5;
	 }
	 //把字符串存入对应索引的输出数组
	 resUrl[i] = outChars;
	 }

	 return resUrl;
	 }

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　短网址　

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