C#数据采集类

小灰灰 2021-12-22 02:07 327阅读 0赞

using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using MSXML2;
    using System.Text.RegularExpressions;
    namespace EC
    {
        
    /// <summary>
    /// 远程文件抓取类
    /// </summary>
        public class GetRemoteObj
        {
        
    
    #region 构造与析构函数
    public GetRemoteObj()
            {
        
    //
    // TODO: 在此处添加构造函数逻辑
    //
            }
            ~GetRemoteObj()
            {
        
                Dispose();
            }
    #endregion
    
    #region IDisposable 成员
    
    public void Dispose()
            {           
                GC.SuppressFinalize(this);
            }
    
    #endregion
    
    #region 日期随机函数
    /**********************************
             * 函数名称:DateRndName
             * 功能说明:日期随机函数
             * 参    数:ra:随机数
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          Random ra = new Random();
             *          string s = o.DateRndName(ra);
             *          Response.Write(s);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 日期随机函数
    /// </summary>
    /// <param name="ra">随机数</param>
    /// <returns></returns>
            public  string DateRndName(Random ra)
            {
        
                DateTime d = DateTime.Now;
    string s = null, y, m, dd, h, mm, ss;
                y = d.Year.ToString();
                m = d.Month.ToString();
    if (m.Length < 2) m = "0" + m;
                dd = d.Day.ToString();
    if (dd.Length < 2) dd = "0" + dd;
                h = d.Hour.ToString();
    if (h.Length < 2) h = "0" + h;
                mm = d.Minute.ToString();
    if (mm.Length < 2) mm = "0" + mm;
                ss = d.Second.ToString();
    if (ss.Length < 2) ss = "0" + ss;
                s += y + m + dd + h + mm + ss;
                s += ra.Next(100, 999).ToString();
    return s;
            }
    #endregion
    
    #region 取得文件后缀
    /**********************************
             * 函数名称:GetFileExtends
             * 功能说明:取得文件后缀
             * 参    数:filename:文件名称
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string url = @"http://www.baidu.com/img/logo.gif";
             *          string s = o.GetFileExtends(url);
             *          Response.Write(s);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 取得文件后缀
    /// </summary>
    /// <param name="filename">文件名称</param>
    /// <returns></returns>
            public string GetFileExtends(string filename)
            {
        
    string ext = null;
    if (filename.IndexOf('.') > 0)
                {
        
    string[] fs = filename.Split('.');
                    ext = fs[fs.Length - 1];
                }
    return ext;
            }
    #endregion
    
    #region 获取远程文件源代码
    /**********************************
             * 函数名称:GetRemoteHtmlCode
             * 功能说明:获取远程文件源代码
             * 参    数:Url:远程url
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string url = @"http://www.baidu.com/";
             *          string s = o.GetRemoteHtmlCode(url);
             *          Response.Write(s);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 获取远程文件源代码
    /// </summary>
    /// <param name="url">远程url</param>
    /// <returns></returns>
            public string GetRemoteHtmlCode(string Url)
            {
        
    string s = "";
                MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
                _xmlhttp.open("GET", Url, false, null, null);
                _xmlhttp.send("");
    if (_xmlhttp.readyState == 4)
                {
        
                    s = System.Text.Encoding.Default.GetString((byte[])_xmlhttp.responseBody);
                }
    return s;
            }
    
    #endregion
    
    #region 保存远程文件
    /**********************************
             * 函数名称：RemoteSave
             * 功能说明：保存远程文件
             * 参    数：Url:远程url;Path:保存到的路径
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string s = "";
             *          string url = @"http://www.baidu.com/img/logo.gif";
             *          string path =Server.MapPath("Html/");
             *          s = o.RemoteSave(url,path);
             *          Response.Write(s);
             *          o.Dispose();         
             * ******************************/
    /// <summary>
    /// 保存远程文件
    /// </summary>
    /// <param name="Url">远程url</param>
    /// <param name="Path">保存到的路径</param>
    /// <returns></returns>
            public string RemoteSave(string Url, string Path)
            {
        
                Random ra = new Random();
    string StringFileName = DateRndName(ra) + "." + GetFileExtends(Url);
    string StringFilePath = Path + StringFileName;
                MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
                _xmlhttp.open("GET", Url, false, null, null);
                _xmlhttp.send("");
    if (_xmlhttp.readyState == 4)
                {
        
    if (System.IO.File.Exists(StringFilePath))
                        System.IO.File.Delete(StringFilePath);
                    System.IO.FileStream fs = new System.IO.FileStream(StringFilePath, System.IO.FileMode.CreateNew);
                    System.IO.BinaryWriter w = new System.IO.BinaryWriter(fs);
                    w.Write((byte[])_xmlhttp.responseBody);
                    w.Close();
                    fs.Close();
                }
    else
    throw new Exception(_xmlhttp.statusText);
    return StringFileName;
            }
    #endregion
    
    #region 替换网页中的换行和引号
    /**********************************
             * 函数名称:ReplaceEnter
             * 功能说明:替换网页中的换行和引号
             * 参    数:HtmlCode:html源代码
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string Url = @"http://www.baidu.com/";
             *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
             *          string s = o.ReplaceEnter(HtmlCode);
             *          Response.Write(s);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 替换网页中的换行和引号
    /// </summary>
    /// <param name="HtmlCode">HTML源代码</param>
    /// <returns></returns>
            public string ReplaceEnter(string HtmlCode)
            {
        
    string s = "";
    if (HtmlCode == null || HtmlCode == "")
                    s = "";
    else
                    s = HtmlCode.Replace("\"", "");
                s = s.Replace("\r\n", "");
    return s;
            }
    
    #endregion              
    
    #region 执行正则提取出值
    /**********************************
             * 函数名称:GetRegValue
             * 功能说明:执行正则提取出值
             * 参    数:HtmlCode:html源代码
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string Url = @"http://www.baidu.com/";
             *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
             *          string s = o.ReplaceEnter(HtmlCode);
             *          string Reg="<title>.+?</title>";
             *          string GetValue=o.GetRegValue(Reg,HtmlCode)
             *          Response.Write(GetValue);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 执行正则提取出值
    /// </summary>
    /// <param name="RegexString">正则表达式</param>
    /// <param name="RemoteStr">HtmlCode源代码</param>
    /// <returns></returns>
            public string  GetRegValue(string RegexString, string RemoteStr)
            {
        
    string MatchVale = "";
                Regex r = new Regex(RegexString);
                Match m = r.Match(RemoteStr);
    if (m.Success)
                {
        
                    MatchVale = m.Value;
                }
    return MatchVale;
            }
    #endregion       
    
    #region 替换HTML源代码
    /**********************************
             * 函数名称:RemoveHTML
             * 功能说明:替换HTML源代码
             * 参    数:HtmlCode:html源代码
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string Url = @"http://www.baidu.com/";
             *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
             *          string s = o.ReplaceEnter(HtmlCode);
             *          string Reg="<title>.+?</title>";
             *          string GetValue=o.GetRegValue(Reg,HtmlCode)
             *          Response.Write(GetValue);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 替换HTML源代码
    /// </summary>
    /// <param name="HtmlCode">html源代码</param>
    /// <returns></returns>
            public string RemoveHTML(string HtmlCode)
            {
        
    string MatchVale = HtmlCode;          
    foreach (Match s in Regex.Matches(HtmlCode, "<.+?>"))
                {
        
                    MatchVale = MatchVale.Replace(s.Value, "");
                }
    return MatchVale;        
            }
    
    #endregion
    
    #region 匹配页面的链接
    /**********************************
             * 函数名称:GetHref
             * 功能说明:匹配页面的链接
             * 参    数:HtmlCode:html源代码
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string Url = @"http://www.baidu.com/";
             *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
             *          string s = o.GetHref(HtmlCode);
             *          Response.Write(s);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 获取页面的链接正则
    /// </summary>
    /// <param name="HtmlCode"></param>
    /// <returns></returns>
            public string GetHref(string HtmlCode)
            {
        
    string MatchVale = "";
    string Reg = @"(h|H)(r|R)(e|E)(f|F) *= *('|"")?((\w|\\|\/|\.|:|-|_)+)('|""| *|>)?";           
    foreach(Match m in Regex.Matches(HtmlCode,Reg))
                {
        
                    MatchVale += (m.Value).ToLower().Replace("href=", "").Trim() + "||";
                }
    return MatchVale;         
            }
    #endregion
    
    #region 匹配页面的图片地址
    /**********************************
             * 函数名称:GetImgSrc
             * 功能说明:匹配页面的图片地址
             * 参    数:HtmlCode:html源代码;imgHttp:要补充的http.当比如:<img src="bb/x.gif">则要补充http://www.baidu.com/,当包含http信息时,则可以为空
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string Url = @"http://www.baidu.com/";
             *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
             *          string s = o.GetImgSrc(HtmlCode,"http://www.baidu.com/");
             *          Response.Write(s);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 匹配页面的图片地址
    /// </summary>
    /// <param name="HtmlCode"></param>
    /// <param name="imgHttp">要补充的http://路径信息</param>
    /// <returns></returns>
            public string GetImgSrc(string HtmlCode, string imgHttp)
            {
        
    string MatchVale = "";
    string Reg = @"<img.+?>";
    foreach (Match m in Regex.Matches(HtmlCode, Reg))
                {
        
                    MatchVale += GetImg((m.Value).ToLower().Trim(), imgHttp) + "||";
                }
    return MatchVale;
            }
    /// <summary>
    /// 匹配<img src="" />中的图片路径实际链接
    /// </summary>
    /// <param name="ImgString"><img src="" />字符串</param>
    /// <returns></returns>
            public string GetImg(string ImgString, string imgHttp)
            {
        
    string MatchVale = "";
    string Reg = @"src=.+\.(bmp|jpg|gif|png|)";
    foreach (Match m in Regex.Matches(ImgString.ToLower(), Reg))
                {
        
                    MatchVale += (m.Value).ToLower().Trim().Replace("src=","");
                }
    return (imgHttp+MatchVale);
            }
    
    #endregion
    
    #region 替换通过正则获取字符串所带的正则首尾匹配字符串
    /**********************************
             * 函数名称:GetHref
             * 功能说明:匹配页面的链接
             * 参    数:HtmlCode:html源代码
             * 调用示例:
             *          GetRemoteObj o = new GetRemoteObj();
             *          string Url = @"http://www.baidu.com/";
             *          strion HtmlCode = o.GetRemoteHtmlCode(Url);
             *          string s = o.RegReplace(HtmlCode,"<title>","</title>");
             *          Response.Write(s);
             *          o.Dispose();
             * ********************************/
    /// <summary>
    /// 替换通过正则获取字符串所带的正则首尾匹配字符串
    /// </summary>
    /// <param name="RegValue">要替换的值</param>
    /// <param name="regStart">正则匹配的首字符串</param>
    /// <param name="regEnd">正则匹配的尾字符串</param>
    /// <returns></returns>
            public string RegReplace(string RegValue, string regStart,string regEnd)
            {
        
    string s = RegValue;
    if (RegValue != "" && RegValue != null)
                {
        
    if (regStart != "" && regStart != null)
                    {
        
                        s = s.Replace(regStart, "");
                    }
    if (regEnd != "" && regEnd != null)
                    {
        
                        s = s.Replace(regEnd, "");
                    }
                }
    return s;
            }
    #endregion
    
    
        }
    }

转载于:https://www.cnblogs.com/daretodream/archive/2012/02/29/2372829.html