本文实例讲述了C#实现类似新浪微博长URL转短地址的方法。分享给大家供大家参考。具体如下：

一、前台判断用户输入URL的JS代码如下。

function CheckInput() { var $txtLength = $("#inp_text").val().length; if ($txtLength > 10) { var url = $("#inp_text").val(); var xx = url.match(RegExp("((news|telnet|nttp|file|http|ftp|https)://){1}(([-A-Za-z0-9]+(\\.[-A-Za-z0-9]+)*(\\.[-A-Za-z]{2,5}))|([0-9]{1,3}(\\.[0-9]{1,3}){3}))(:[0-9]*)?(/[-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]*)*", "gi") || []); if (xx != null) { for (var i = 0; i < xx.length; i++) { var $txtLength = $("#inp_text").val().length; $txtLength = $txtLength - xx[i].length + 11; } } } if ($txtLength < 141) { $("#div_txtlength").html("还能输入<span>" + (140 - $txtLength) + "</span>个字"); } else { $("#div_txtlength").html("超出<span>" + ($txtLength - 140) + "</span>个字"); } } function InsertText() { if ($("#inp_text").val().Trim().length == 0) { art.dialog({ title: '错误', icon: 'error', content: '请输入内容', width: "150px", height: "80px", lock: true }); return; } //长url转换成短url var url = $("#inp_text").val(); var xx = url.match(RegExp("((news|telnet|nttp|file|http|ftp|https)://){1}(([-A-Za-z0-9]+(\\.[-A-Za-z0-9]+)*(\\.[-A-Za-z]{2,5}))|([0-9]{1,3}(\\.[0-9]{1,3}){3}))(:[0-9]*)?(/[-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]*)*", "gi") || []); var $txtLength = $("#inp_text").val().length; if (xx != null) { for (var i = 0; i < xx.length; i++) { $txtLength = $txtLength - xx[i].length + 11; } } if ($txtLength < 141) { $("#div_txtlength").html("还能输入<span>" + (140 - $txtLength) + "</span>个字"); } else { $("#div_txtlength").html("超出<span>" + ($txtLength - 140) + "</span>个字"); } if ($txtLength > 140) { art.dialog({ title: '错误', icon: 'error', content: '字数超出限制', width: "150px", height: "80px", lock: true }); return false; } $.ajax({ type: "POST", url: "../MiniBlog/Handler.ashx", data: { "txt": $("#inp_text").val() }, datatype: "html", beforeSend: function () { $("#div_txtlength").html("正在提交。。。"); }, success: function (data) { if (data.length > 1) { window.location.reload(); } else { art.dialog({ title: '错误', icon: 'error', content: '发布失败，请复制内容后刷新当前页面。', width: "150px", height: "80px", lock: true }); } }, complete: function (XMLHttpRequest, textStatus) { // alert(XMLHttpRequest.responseText); // alert(textStatus); }, error: function () { } }); }

二、前台ASPX的代码如下（部分）

<div class="title_left"> 有什么新鲜事和大家分享？</div> <div class="left_box"> <textarea class="textarea01" id="inp_text" onblur="CheckInput()" onkeyup="CheckInput()"></textarea></div> <div class="left_box"> <div class="insert" style="visibility: hidden"> <ul> <li style="background: url(../images/weibo/icon.jpg) no-repeat -172px 0px;"><a href="#"> 表情</a></li> <li style="background: url(../images/weibo/icon.jpg) no-repeat -115px 0px;"><a href="#"> 图片</a></li> <li style="background: url(../images/weibo/icon.jpg) no-repeat -229px 0px;"><a href="#"> 音乐</a></li> </ul> </div> <div class="Prompt" id="div_txtlength"> 还能输入<span>140</span>字</div> <div class="bottom_gb"> <a href="javascript:void(0)" onclick="InsertText();" class="link1"></a> </div> </div>

三、以上是用来判断用户输入内容里面是否含有网址，下面是后台提交到数据库的时候进行的转换

#region 长url转短url Regex rx = new Regex("((news|telnet|nttp|file|http|ftp|https)://){1}(([-A-Za-z0-9]+(\\.[-A-Za-z0-9]+)*(\\.[-A-Za-z]{2,5}))|([0-9]{1,3}(\\.[0-9]{1,3}){3}))(:[0-9]*)?(/[-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]*)*", RegexOptions.IgnoreCase); string txt_context = context.Request.Form["txt"].ToString(); MatchCollection mc = rx.Matches(txt_context); if (mc.Count > 0) { for (int i = 0; i < mc.Count; i++) { Haedu.Gxt.Model.MINIBLOGURL_Model M_url = new Haedu.Gxt.Model.MINIBLOGURL_Model(); Haedu.Gxt.Bll.MINIBLOGURL B_url = new Haedu.Gxt.Bll.MINIBLOGURL(); M_url.BACKUP1 = Common.md5(mc[i].Value); M_url.BACKUP2 = " "; M_url.CREATETIME = DateTime.Now; M_url.CREATEUSER = User_BaseInfo.GetUserID; M_url.ID = Common.GetGUID; M_url.STATE = 0; M_url.SURL = mc[0].Value; M_url.TURL = MiniBlog.ShortUrl(mc[i].Value); txt_context = txt_context.Replace(mc[i].Value, M_url.TURL); if(!B_url.Exists(M_url.BACKUP1)) { B_url.Add(M_url); } } } #endregion #region 写入微博数据库 --写入微博数据库的代码 #endregion

四、MiniBlog.ShortUrl方法代码

#region 长转短url /// <summary> /// 长url转短url /// </summary> /// <param name="url">原url</param> /// <returns>返回短url</returns> 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 = "Haedu_MiniBlog"; //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 "http://url.cn/" + resUrl[(new Random()).Next(0, 3)]; } #endregion

五、短URL转换成原始URL

#region 短url替换成原始url public static string CheckUrl(string context) { Regex rx = new Regex("((news|telnet|nttp|file|http|ftp|https)://){1}(([-A-Za-z0-9]+(\\.[-A-Za-z0-9]+)*(\\.[-A-Za-z]{2,5}))|([0-9]{1,3}(\\.[0-9]{1,3}){3}))(:[0-9]*)?(/[-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]*)*", RegexOptions.IgnoreCase); MatchCollection mc = rx.Matches(context); if (mc.Count > 0) { for (int i = 0; i < mc.Count; i++) { Haedu.Gxt.Model.MINIBLOGURL_Model M_url = new Haedu.Gxt.Model.MINIBLOGURL_Model(); Haedu.Gxt.Bll.MINIBLOGURL B_url = new Haedu.Gxt.Bll.MINIBLOGURL(); M_url = B_url.GetModel(mc[i].Value); if (M_url != null) { if (int.Parse(M_url.STATE.ToString()) == 2) { context = context.Replace(mc[i].Value, "链接已经被屏蔽"); } else { context = context.Replace(mc[i].Value, "<a href=\"" + M_url.SURL + "\" target=\"_blank\" title=\"" + M_url.SURL + "\" >" + mc[i].Value + "</a>"); } } } } return context; } #endregion

六、数据库结构（oracle）

-- Create table create table MINIBLOGURL ( id VARCHAR2(50) not null, surl VARCHAR2(200) not null, turl VARCHAR2(100) not null, createtime DATE not null, createuser VARCHAR2(50) not null, state NUMBER(1) not null, backup1 VARCHAR2(200) not null, backup2 VARCHAR2(200) not null ) tablespace TAB_GXT pctfree 10 initrans 1 maxtrans 255 storage ( initial 64K next 8K minextents 1 maxextents unlimited ); -- Add comments to the columns comment on column MINIBLOGURL.id is '逻辑ID'; comment on column MINIBLOGURL.surl is '原始url'; comment on column MINIBLOGURL.turl is '转成的短url'; comment on column MINIBLOGURL.createtime is '创建时间'; comment on column MINIBLOGURL.createuser is '创建人ID'; comment on column MINIBLOGURL.state is '状态，0为认证的网址（比较知名的网站域名），1为未认证的网址（小网站），2为锁定不允许点击（广告类的网址）'; comment on column MINIBLOGURL.backup1 is 'MD5值，用来比较网址是否已经存在'; comment on column MINIBLOGURL.backup2 is '备用字段2'; -- Create/Recreate primary, unique and foreign key constraints alter table MINIBLOGURL add constraint PK_ID primary key (ID) using index tablespace TAB_GXT pctfree 10 initrans 2 maxtrans 255 storage ( initial 64K next 1M minextents 1 maxextents unlimited ); -- Create/Recreate indexes create index IX_CREATEUSER on MINIBLOGURL (CREATEUSER) tablespace TAB_GXT pctfree 10 initrans 2 maxtrans 255 storage ( initial 64K next 1M minextents 1 maxextents unlimited ); create unique index IX_MD5 on MINIBLOGURL (BACKUP1) tablespace TAB_GXT pctfree 10 initrans 2 maxtrans 255 storage ( initial 64K next 1M minextents 1 maxextents unlimited ); create index IX_SURL on MINIBLOGURL (SURL) tablespace TAB_GXT pctfree 10 initrans 2 maxtrans 255 storage ( initial 64K next 1M minextents 1 maxextents unlimited ); create index IX_TURL on MINIBLOGURL (TURL) tablespace TAB_GXT pctfree 10 initrans 2 maxtrans 255 storage ( initial 64K next 1M minextents 1 maxextents unlimited );

至此，基于上面的代码即可完成微博的长短URL相互转换，具体应用的时候还需要自己进行调整修改。

希望本文所述对大家的C#程序设计有所帮助。