发布新闻，把外链接的图片下载到本地

Path.GetExtension("string.jpg")    // 获得字符串的扩展名

WebClient wc = new WebClient();  //

wc.DownloadFile("http://img.style.20011212.jpg","Path");  // 此方法将指定的URL资源下载到本地

  

View Code

   
     

    
       1 
    
       
    
      private
    
       
    
      string
    
       SaveUrlPics(
    
      string
    
       strHtml, 
    
      string
    
       path, 
    
      string
    
       nowyymm, 
    
      string
    
       nowdd)

    
       2 
    
       {
   
     
   
     

    
      　　　　　　　　 //strHtml 内容

    
       3 
    
       
    
      string
    
      [] imgurlAry 
    
      =
    
       GetImgTag(strHtml); // 获得内容中的 外链地址 数组

    
       4 　　　　　　　　
    
      

    
       5 
    
       
    
      try
    
      

    
       6 
    
       {

    
       7 
    
       
    
      foreach
    
       (
    
      string
    
       t 
    
      in
    
       imgurlAry)

    
       8 
    
       {

    
       9 
    
       
    
      string
    
       fileName 
    
      =
    
       DateTime.Now.ToString(
    
      "
    
      yyyyMMddhhmmssfffff
    
      "
    
      ).Substring(
    
      0
    
      , 
    
      17
    
      );

    
      10 
    
       var wc 
    
      =
    
       
    
      new
    
       WebClient();

    
      11 
    
       
    
      if
    
       (t 
    
      ==
    
       
    
      ""
    
      ) 
    
      continue
    
      ;

    
      12 
    
       wc.DownloadFile(t, HttpContext.Current.Server.MapPath(path) 
    
      +
    
       
    
      "
    
      /
    
      "
    
       
    
      +
    
       fileName 
    
      +
    
       t.Substring(t.LastIndexOf(
    
      "
    
      .
    
      "
    
      )));

    
      13 
    
      

    
      14 
    
       
    
      //
    
      替换原图片地址
    
      

    
      15 
    
       
    
       
    
      string
    
       imgPath 
    
      =
    
       
    
      "
    
      /FileUpload/
    
      "
    
       
    
      +
    
       nowyymm 
    
      +
    
       
    
      "
    
      /
    
      "
    
       
    
      +
    
       nowdd;
   
     
   
     

    
      　　　　　　　　　　　　　// 替换内容中图片的 外链接 地址


    
      16 
    
       strHtml 
    
      =
    
       strHtml.Replace(t, imgPath 
    
      +
    
       
    
      "
    
      /
    
      "
    
       
    
      +
    
       fileName 
    
      +
    
       t.Substring(t.LastIndexOf(
    
      "
    
      .
    
      "
    
      )));

    
      17 
    
      

    
      18 
    
       }

    
      19 
    
       }

    
      20 
    
       
    
      catch
    
       (Exception ex)

    
      21 
    
       {

    
      22 
    
       
    
      return
    
       ex.Message;

    
      23 
    
       }

    
      24 
    
      

    
      25 
    
       
    
      return
    
       strHtml;

    
      26 
    
      

    
      27 
    
       }
   
     

用正则表达式 匹配 提取内容中的 <img  > 标签    返回  <img src=""  ....>

View Code

   
     

    
       1 
    
       
    
      ///
    
       
    
      <summary>
    
      

    
       2 
    
       
    
      ///
    
       获取内容中的图片信息

    
       3 
    
       
    
      ///
    
       
    
      </summary>
    
      

    
       4 
    
       
    
      ///
    
       
    
      <param name="htmlStr"></param>
    
      

    
       5 
    
       
    
      ///
    
       
    
      <returns></returns>
    
      

    
       6 
    
       
    
       
    
      private
    
       
    
      string
    
      [] GetImgTag(
    
      string
    
       htmlStr)

    
       7 
    
       {

    
       8 
    
       var regObj 
    
      =
    
       
    
      new
    
       Regex(
    
      "
    
      <img.+?>
    
      "
    
      , RegexOptions.Compiled 
    
      |
    
       RegexOptions.IgnoreCase);

    
       9 
    
       var strAry 
    
      =
    
       
    
      new
    
       
    
      string
    
      [regObj.Matches(htmlStr).Count];

    
      10 
    
       
    
      int
    
       i 
    
      =
    
       
    
      0
    
      ;

    
      11 
    
       
    
      foreach
    
       (Match matchItem 
    
      in
    
       regObj.Matches(htmlStr))

    
      12 
    
       {

    
      13 
    
       strAry[i] 
    
      =
    
       GetImgUrl(matchItem.Value);

    
      14 
    
       i
    
      ++
    
      ;

    
      15 
    
       }

    
      16 
    
       
    
      return
    
       strAry;

    
      17 
    
       }
   
     

用正则表达式匹配 传入的  <img  > 标签   获取 链接 地址  返回 http://img.sina.2100.jpg;

View Code

   
     

    
       1 
    
      ///
    
       
    
      <summary>
    
      

    
       2 
    
       
    
      ///
    
       获取图片URL地址 

    
       3 
    
       
    
      ///
    
       
    
      </summary>
    
      

    
       4 
    
       
    
      ///
    
       
    
      <param name="imgTagStr"></param>
    
      

    
       5 
    
       
    
      ///
    
       
    
      <returns></returns>
    
      

    
       6 
    
       
    
       
    
      private
    
       
    
      static
    
       
    
      string
    
       GetImgUrl(
    
      string
    
       imgTagStr)

    
       7 
    
       {

    
       8 
    
       var str 
    
      =
    
       
    
      ""
    
      ;

    
       9 
    
       var regObj 
    
      =
    
       
    
      new
    
       Regex(
    
      "
    
      http://.+.(?:jpg|gif|bmp|png)
    
      "
    
      , RegexOptions.Compiled 
    
      |
    
       RegexOptions.IgnoreCase);

    
      10 
    
       
    
      foreach
    
       (Match matchItem 
    
      in
    
       regObj.Matches(imgTagStr))

    
      11 
    
       {

    
      12 
    
       str 
    
      =
    
       matchItem.Value;

    
      13 
    
       }

    
      14 
    
       
    
      return
    
       str;

    
      15 
    
       }