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    Web 2.0时代RSS的.Net实现

    2018-04-16 10:57:55 次阅读 稿源:互联网
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      Web2.0时是以Blog,Wike,Tag,RSS等技术为代表的以个性化为中心的新一代互联网模式,RSS比起Blog等名词似乎还不算太热。但打开网页仍是遍布了RSS,Xml等醒目的图标,打开页面Mathon浏览器也是一个劲的提示有新的RSS连接,前一段一个项

      目需要,自己写了一个.Net下面生成RSS信息的类,如下:

      
        1using System;
        2using System.Xml;
        3using System.Collections;
        4using System.Globalization;
        5using System.Web;
        6
        7namespace BLRL
        8{
        9    /// <summary>
       10    /// Summary description for Rss.
       11    /// </summary>
       12    public class Rss
       13    {
       14        const string dublinCoreNamespaceUri = @"http://purl.org/dc/elements/1.1/";
       15        const string slashNamespaceUri = @"http://purl.org/rss/1.0/modules/slash/";
       16        const string syndicationNamespaceUri = @"http://purl.org/rss/1.0/modules/syndication/";
       17        //RSS频道结构
       18        struct RssChannel
       19        {
       20            public string title;//标题
       21            public string link;//连接
       22            public string language;//语言           
       23            public string description;//描述
       24            public string webMaster;//发布者
       25        }
       26
       27        //RSS图片信息
       28        struct RssImage
       29        {
       30            public string url;//地址
       31            public string title;//标题
       32            public int height ;//高度
       33            public int width;//长度
       34        }
       35       
       36        //RSS项结构
       37        struct RssItem
       38        {
       39            public string title;//标题
       40            public string catalog;//类别
       41            public string link;//连接
       42            public DateTime pubDate;//发布日期
       43            public string description;//描述
       44
       45        }
       46        public Rss()
       47        {
       48            //
       49            // TODO: Add constructor logic here
       50            //
       51        }
       52        /// <summary>
       53        ///添加rss版本信息
       54        /// </summary>
       55        /// <param name="xmlDocument"></param>
       56        /// <returns></returns>
       57        public static XmlDocument  AddRssPreamble( XmlDocument xmlDocument)
       58        {
       59            //声明创建1.0版本得xml
       60            XmlDeclaration xmlDeclaration = xmlDocument.CreateXmlDeclaration("1.0", "utf-8", null);
       61            xmlDocument.InsertBefore(xmlDeclaration, xmlDocument.DocumentElement);
       62
       63            XmlElement rssElement = xmlDocument.CreateElement("rss");
       64
       65            XmlAttribute rssVersionAttribute = xmlDocument.CreateAttribute("version");
       66            rssVersionAttribute.InnerText = "2.0";
       67            rssElement.Attributes.Append(rssVersionAttribute);
       68            xmlDocument.AppendChild(rssElement);
       69
       70          
       71            XmlAttribute dublicCoreNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:dc");
       72            dublicCoreNamespaceUriAttribute.InnerText = dublinCoreNamespaceUri;
       73            rssElement.Attributes.Append(dublicCoreNamespaceUriAttribute);
       74
       75            XmlAttribute slashNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:slash");
       76            slashNamespaceUriAttribute.InnerText = slashNamespaceUri;
       77            rssElement.Attributes.Append(slashNamespaceUriAttribute);
       78
       79            XmlAttribute syndicationNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:sy");
       80            syndicationNamespaceUriAttribute.InnerText = syndicationNamespaceUri;
       81            rssElement.Attributes.Append(syndicationNamespaceUriAttribute);
       82
       83
       84            return xmlDocument;
       85        }
       86       
       87        /// <summary>
       88        /// 添加频道
       89        /// </summary>
       90        /// <param name="xmlDocument"></param>
       91        /// <param name="channel"></param>
       92        /// <returns></returns>
       93        private static XmlDocument AddRssChannel( XmlDocument xmlDocument, RssChannel channel)
       94        {
       95            XmlElement channelElement = xmlDocument.CreateElement("channel");
       96            XmlNode rssElement = xmlDocument.SelectSingleNode("rss");
       97
       98            rssElement.AppendChild(channelElement);
       99
      100            //添加标题
      101            XmlElement channelTitleElement = xmlDocument.CreateElement("title");
      102            channelTitleElement.InnerText = channel.title;
      103            channelElement.AppendChild(channelTitleElement);
      104
      105            //添加连接
      106            XmlElement channelLinkElement = xmlDocument.CreateElement("link");
      107            channelLinkElement.InnerText = channel.link;
      108            channelElement.AppendChild(channelLinkElement);
      109
      110            //添加描述
      111            XmlElement channelDescriptionElement = xmlDocument.CreateElement("description");
      112            XmlCDataSection cDataDescriptionSection = xmlDocument.CreateCDataSection(channel.description);
      113            channelDescriptionElement.AppendChild(cDataDescriptionSection);
      114            channelElement.AppendChild(channelDescriptionElement);
      115           
      116            //添加语言
      117            XmlElement languageElement = xmlDocument.CreateElement("language");
      118            languageElement.InnerText = channel.language;
      119            channelElement.AppendChild(languageElement);
      120
      121            //添加发布者
      122            XmlElement webMasterElement = xmlDocument.CreateElement("webMaster");
      123            webMasterElement.InnerText = channel.webMaster;
      124            channelElement.AppendChild(webMasterElement);
      125
      126            return xmlDocument;
      127        }
      128
      129
      130        //添加RssImage
      131        private static XmlDocument AddRssImage(XmlDocument xmlDocument, RssImage img)
      132        {
      133            XmlElement imgElement = xmlDocument.CreateElement("image");
      134            XmlNode channelElement = xmlDocument.SelectSingleNode("rss/channel"); 
      135
      136            //创建标题
      137            XmlElement imageTitleElement = xmlDocument.CreateElement("title");
      138            imageTitleElement.InnerText = img.title;
      139            imgElement.AppendChild(imageTitleElement);
      140
      141            //创建地址
      142            XmlElement imageUrlElement = xmlDocument.CreateElement("url");
      143            imageUrlElement.InnerText = img.url;
      144            imgElement.AppendChild(imageUrlElement);
      145
      146            //创建高度
      147            XmlElement imageHeightElement = xmlDocument.CreateElement("height");
      148            imageHeightElement.InnerText = img.height.ToString();
      149            imgElement.AppendChild(imageHeightElement);
      150
      151            //创建长度
      152            XmlElement imageWidthElement = xmlDocument.CreateElement("width");
      153            imageWidthElement.InnerText = img.width.ToString();
      154            imgElement.AppendChild(imageWidthElement);
      155
      156            //将图像节点添加到频道节点里面
      157            channelElement.AppendChild(imgElement);
      158            return xmlDocument;
      159         
      160        }
      161
      162
      163        /// <summary>
      164        /// 添加项信息
      165        /// </summary>
      166        /// <param name="xmlDocument"></param>
      167        /// <param name="item"></param>
      168        /// <returns></returns>
      169        private static XmlDocument AddRssItem (XmlDocument xmlDocument, RssItem item)
      170        {
      171            XmlElement itemElement = xmlDocument.CreateElement("item");
      172            XmlNode channelElement = xmlDocument.SelectSingleNode("rss/channel");
      173
      174            //创建标题
      175            XmlElement itemTitleElement = xmlDocument.CreateElement("title");           
      176            XmlCDataSection cDataTitleSection = xmlDocument.CreateCDataSection(item.title);
      177            itemTitleElement.AppendChild(cDataTitleSection);           
      178            itemElement.AppendChild(itemTitleElement);
      179
      180            //创建日期
      181            XmlElement pubDateElement = xmlDocument.CreateElement("pubDate");
      182            pubDateElement.InnerText = XmlConvert.ToString(item.pubDate.ToUniversalTime(), "yyyy-MM-ddTHH:mm:ss");
      183            itemElement.AppendChild(pubDateElement);
      184           
      185            //添加连接
      186            XmlElement itemLinkElement = xmlDocument.CreateElement("link");
      187            itemLinkElement.InnerText = item.link;
      188            itemElement.AppendChild(itemLinkElement);
      189
      190            //创建描述
      191            XmlElement itemDescriptionElement = xmlDocument.CreateElement("description");
      192            XmlCDataSection cDataDescriptionSection = xmlDocument.CreateCDataSection(item.description);           
      193            itemDescriptionElement.AppendChild(cDataDescriptionSection);
      194            itemElement.AppendChild(itemDescriptionElement);
      195
      196
      197            //创建类型
      198            XmlElement itemcatalogElement = xmlDocument.CreateElement("catalog");
      199            itemcatalogElement.InnerText = item.catalog;
      200            itemElement.AppendChild(itemcatalogElement);
      201
      202            //将RssItem添加到频道节点里面
      203            channelElement.AppendChild(itemElement);
      204
      205            return xmlDocument;
      206        }
      207   }
      208}
      根据特定的需要,可以先将数据读取到列表里面,然后遍历列表,调用上述方法,生成Xml字符串。
      这个字符串就是RS用到XML字符串了。也可以入aspx文件,然后用 <link type="application/rss+xml" rel="alternate" href="rssfeed.aspx">调用下RSS文件,马桶等软件就会自动提示有RRS信息了

      http://jillzhang.cnblogs.com/archive/2006/06/11/423086.html

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