C#实现类似新浪微博长URL转短地址的方法

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。