/// <summary>
/// 下载指定ＵＲＬ下的所有图片
/// </summary>
public class WebPageImage
{
/// <summary>
/// 获取网页中全部图片
/// </summary>
/// <param name="url">网页地址</param>
/// <param name="charSet">网页编码，为空自动判断</param>
/// <returns>全部图片显示代码</returns>
public string getImages(string url, string charSet)
{
string s = getHtml(url, charSet);
return getPictures(s, url);
}
/// <summary>
/// 获取网页中全部图片
/// </summary>
/// <param name="url">网址</param>
/// <returns>全部图片代码</returns>
public string getImages(string url)
{
return getImages(url, "");
}
string doman(string url)
{
Uri u = new Uri(url);
return u.Host;
}
/// <summary>
/// 获取网页内容
/// </summary>
/// <param name="url">网站地址</param>
/// <param name="charSet">目标网页的编码,如果传入的是null或者"",那就自动分析网页的编码 </param>
/// <returns></returns>
string getHtml(string url, string charSet)
{
WebClient myWebClient = new WebClient();
//创建WebClient实例myWebClient
// 需要注意的：
//有的网页可能下不下来，有种种原因比如需要cookie,编码问题等等
//这是就要具体问题具体分析比如在头部加入cookie
// webclient.Headers.Add("Cookie", cookie);
//这样可能需要一些重载方法。根据需要写就可以了
//获取或设置用于对向 Internet 资源的请求进行身份验证的网络凭据。
myWebClient.Credentials = CredentialCache.DefaultCredentials;
//如果服务器要验证用户名,密码
//NetworkCredential mycred = new NetworkCredential(struser, strpassword);
//myWebClient.Credentials = mycred;
//从资源下载数据并返回字节数组。（加@是因为网址中间有"/"符号）
byte[] myDataBuffer = myWebClient.DownloadData(url);
string strWebData = Encoding.Default.GetString(myDataBuffer);
//获取网页字符编码描述信息
Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)\"", RegexOptions.IgnoreCase | RegexOptions.Multiline);
string webCharSet = charSetMatch.Groups[2].Value.Replace("\"", "");
if (charSet == null || charSet == "")
charSet = webCharSet;
if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)
strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);
return strWebData;
}
string getPictures(string data, string url)
{
MatchCollection ps = Regex.Matches(data, @"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""‘]?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""‘<>]*)[^<>]*?/?[\s\t\r\n]*>");
string s = string.Empty;
for (int i = 0; i < ps.Count; i++)
{
pictures p = new pictures(ps[i].Value, url);
s += p.GetHtml + "<br />" + Environment.NewLine;
}
return s;
}
/// <summary>
/// 图片实体
/// 图片文件属性处理类
/// </summary>
public class pictures
{
public pictures(string strHtml, string baseUrl)
{
_html = strHtml;
Uri u1 = new Uri(baseUrl);
_doman = u1.Host;
_baseUrl = u1.Scheme + "://" + _doman;
setSrc();
}
private string _html = string.Empty;
private string _baseUrl = string.Empty;
private string _doman = string.Empty;
public string GetHtml
{
get { return _html; }
}
public string Alt
{
get
{
return GetAttribute("alt")[0];
}
}
public string Src
{
get
{
string s = GetAttribute("src")[0];
return s;
}
}
/// <summary>
/// 根据基路径把相对路径转换成绝对径
/// </summary>
/// <param name="baseUrl">基础路径</param>
/// <param name="u">待转换的相对路径</param>
/// <returns>绝对路径</returns>
public string absUrl(string baseUrl, string u)
{
Uri ub = new Uri(baseUrl);
Uri ua = new Uri(ub, u);
return ua.AbsoluteUri;
}
private void setSrc()
{
string strPattern = @"src[\s\t\r\n]*=[\s\t\r\n]*[""‘]?\S+[""‘]?";
string src = GetAttribute("src")[0].ToLower();
if (!(src.IndexOf("http://") == 0 || src.IndexOf("https://") == 0) && _baseUrl.Length > 10)
{
src = absUrl(_baseUrl, src);
string s = "src=\"" + src + "\"";
_html = Regex.Replace(_html, strPattern, s);
}
}
/// <summary>
/// 获取HTML代码中标签属性
/// </summary>
/// <param name="strHtml">HTML代码</param>
/// <param name="strAttributeName">属性名称</param>
/// <returns>属性值集合</returns>
private string[] GetAttribute(string strAttributeName)
{
List<string> lstAttribute = new List<string>();
string strPattern = string.Format(
@"{0}[\s\t\r\n]*=[\s\t\r\n]*[""‘]?\S+[""‘]?",
strAttributeName
);
MatchCollection matchs = Regex.Matches(_html, strPattern, RegexOptions.IgnoreCase);
foreach (Match m in matchs)
{
lstAttribute.Add(m.Value.Split(‘=‘)[1].Replace("\"", "").Replace("‘", ""));
}
if (lstAttribute.Count == 0) lstAttribute.Add("");
return lstAttribute.ToArray();
}
}
/// <summary>
/// 取得HTML中所有图片的 URL。
/// </summary>
/// <param name="sHtmlText">HTML代码</param>
/// <returns>图片的URL列表</returns>
public string[] GetHtmlImageUrlList(string sHtmlText)
{
// 定义正则表达式用来匹配 img 标签
Regex regImg = new Regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""‘]?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""‘<>]*)[^<>]*?/?[\s\t\r\n]*>", RegexOptions.IgnoreCase);
// 搜索匹配的字符串
MatchCollection matches = regImg.Matches(sHtmlText);
int i = 0;
string[] sUrlList = new string[matches.Count];
// 取得匹配项列表
foreach (Match match in matches)
sUrlList[i++] = match.Groups["imgUrl"].Value;
return sUrlList;
}
}
调用的自己设定修改
/// <summary>
/// 一键下载
/// </summary>
/// <param name="url">url地址</param>
/// <returns></returns>
[HttpPost]
public ActionResult ImgDow(string url)
{
//System.Drawing.Bitmap img = null;
HttpWebRequest req;
HttpWebResponse res = null;
try
{
Common.WebPageImage model = new WebPageImage();
string v = model.getImages(url, "");
string[] Arrt = model.GetHtmlImageUrlList(v);
foreach (var item in Arrt)
{
string[] file = item.Split(‘/‘);
if(file.Count()>4)
{
//string name = string.IsNullOrEmpty(System.IO.Path.GetFileName(file[0])) ? DateTime.Now.ToFileTime().ToString() : System.IO.Path.GetFileName(file[0]);
//System.Uri httpUrl = new System.Uri(item);
//req = (HttpWebRequest)(WebRequest.Create(httpUrl));
//req.Timeout = 180000; //设置超时值10秒
//req.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
//req.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";
//req.Method = "GET";
//res = (HttpWebResponse)(req.GetResponse());
//Stream strea = res.GetResponseStream();
//img = new Bitmap(strea);//获取图片流
//string[] imgGS = file[3].Split(‘_‘);
//switch (imgGS[1])
//{
// case "gif":
// img.Save(@"E:/" + DateTime.Now.ToFileTime().ToString() + ".gif", ImageFormat.Gif);
// break;
// case "jpg":
// img.Save(@"E:/" + DateTime.Now.ToFileTime().ToString() + ".jpg");
// break;
// case "png":
// img.Save(@"E:/" + DateTime.Now.ToFileTime().ToString() + ".png");
// break;
// default:
// img.Save(@"E:/" + DateTime.Now.ToFileTime().ToString() + ".jpg");
// break;
//}
WebClient my = new WebClient();
byte[] mybyte;
mybyte = my.DownloadData(item);
MemoryStream ms = new MemoryStream(mybyte);
System.Drawing.Image img;
img = System.Drawing.Image.FromStream(ms);
img.Save(@"E:/" + DateTime.Now.ToFileTime().ToString() + ".gif", ImageFormat.Gif); //保存
System.Threading.Thread.Sleep(1000);
}
}
return WriteSuccess("1");
}
catch (Exception ex)
{
return WriteError(ex.Message);
}
finally
{
//res.Close();
}
}
时间： 2024-10-12 15:53:04