在线实现RSS阅读器

2025-02-06 技术教程

1、通过XmlDocument类实现RSS信息获取

/// <summary>/// 获得要显示的Feed种子数据/// </summary>/// <param name="RssUrl"></param>/// <param name="showNewsCount"></param>/// <returns></returns>public string LoadRSS(string RssUrl, int showNewsCount){string strRssList = "";string strMsg;try{XmlDocument objXMLDoc = new XmlDocument();objXMLDoc.Load(RssUrl); //加载XML文档XmlNodeList objItems = objXMLDoc.GetElementsByTagName("item");//获取所有匹配的元素if (showNewsCount > 30)showNewsCount = 10; //只显示10条记录if (showNewsCount < 1)showNewsCount = objItems.Count;string title = "";string link = "";int i;if (objXMLDoc.HasChildNodes == true) //该文档有子节点{i = 1;foreach (XmlNode objNode in objItems) //循环所有元素{if (i <= showNewsCount){if (objNode.HasChildNodes == true){XmlNodeList objItemsChild = objNode.ChildNodes; //得到当前元素的所有子节点foreach (XmlNode objNodeChild in objItemsChild){switch (objNodeChild.Name){case "title":title = objNodeChild.InnerText;break;case "link":link = objNodeChild.InnerText;break;}}i = i + 1;strRssList += "<a href=" + link + " target=_blank>" + title + "</a><br>";}}}}strMsg = strRssList;}catch{strMsg = "RSS Feed 源数据出错！";}return strMsg;}

2、通过XMLHTTP无刷新更新在线RSS阅读获取

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>无刷新动态更新的在线RSS阅读获取</title><script type="text/javascript">var oDiv;var xh = null;function getXML() {try {xh = new ActiveXObject("Msxml2.XMLHTTP");}catch (e) {try {xh = new ActiveXObject("Microsoft.XMLHTTP");}catch (oc) {xh = null}}if (!xh && typeof XMLHttpRequest != "undefined") {xh = new XMLHttpRequest();}oDiv = document.getElementById("rssitem");oDiv.style.display = "";try {//如果是本地改成下面语句直接读取xh.open("GET", "03-R***ss.xml", false);xh.send(null);loadData(xh, oDiv);}catch (e) {error(oDiv, xh);}}function loadData(xh, oDiv) //解析XML数据{if (xh.readyState == 4) //已完成{xml = xh.responsexml;var i;var nodes = xml.selectNodes("/rss/channel/item"); //查询子节点var bloglink = xml.selectSingleNode("/rss/channel/link").text; //单个节点oDiv.innerHTML = "";var html;for (i = 0; i < nodes.length; i++) {html += "<div >";html += " <div >";html += " <a class=font1 href='" + nodes[i].selectSingleNode("link").text + "' target='_blank'>" + nodes[i].selectSingleNode("title").text + "</a><BR><BR>";html += " </div>";html += " <div >";html += " " + nodes[i].selectSingleNode("description").text;html += " </div>"html += "</div><hr>";}oDiv.innerHTML = html;}else {error(oDiv, xh);}}function error(oDiv, xh) //错误处理{alert(xh.readyState);if (xh.readyState == 4) {if (xh.status == 200) {oDiv.innerHTML = "完成"}else {oDiv.innerHTML = "抱歉，装载数据失败。原因：" + xh.statusText}}else {oDiv.innerHTML = "载入失败。原因：";}}</script></head><body onload="window.setTimeout('getXML()',200);"><div align="center"><table cellpadding="0" cellspacing="0" border="0" width="80%"><tr><td><div id="rssitem" ></div></td></tr></table></div></body></html>