代码如下：
private string GetHttpStr(string str, string httpStr)
{
bool Ishavevalue = false;
int newlength = httpStr.Length;
string newstr = null;
string httpendString = "<";
if (str.Length >= newlength && str.Contains(httpStr))
{
newstr = str.Substring(str.IndexOf(httpStr, StringComparison.OrdinalIgnoreCase) + newlength);
}
int startindex = 0;
startindex = str.IndexOf(httpStr, StringComparison.OrdinalIgnoreCase);
int lengthindex = 0;
string returnvalue = null;
if (startindex >= 0)
{
if (newstr.IndexOf('"') != -1 && newstr.IndexOf('"') <= newstr.IndexOf(httpendString))
{
lengthindex = newstr.IndexOf('"') + newlength;
}
else if (newstr.IndexOf('"') == -1 && newstr.IndexOf(httpendString) == -1)
{
lengthindex = str.Length;
}
else
{
lengthindex = newstr.IndexOf(httpendString) + newlength;
}
if (lengthindex == (newlength - 1))
{
lengthindex = newstr.IndexOf(httpendString) + newlength;
}
returnvalue = str.Substring(startindex, lengthindex);
Ishavevalue = true;
}
returnvalue = ReplaceSpecialUrl(returnvalue);
return returnvalue + " " + ((startindex + lengthindex) < str.Length && startindex > 0 && Ishavevalue ? GetHttpStr(str.Substring(startindex + lengthindex), httpStr) : null);
}
因为HTTP连接在html都是以"结束或者<结束，所以根据传入的httpStr样式不区分大小写方式把字符串str含有的以递归的方式找出来。