html中的表格一般都存儲着比較重要的信息，雖然現在css+div已是主流，但筆者還是不建議把信息添加到div中，過度的使用div標籤一樣是一場災難^_^。下面的代碼可以解析html table，感興趣的朋友可以看看。
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using System; using System.Collections.Generic; using System.Xml; using System.Text; using Sgml; using System.IO; using System.Netpdf; using System.ComponentModel; namespace Freemouse.Base.parser { /// <summary> /// html table 解析器 /// </summary> { private List<HTMLTable> table; private XmlDocument doc; private Encoding objEncoding; private SgmlReader reader; private byte[] htmlBytes; private bool disposed = false; private Component component = new Component(); /// <summary> /// 文本的編碼格式 /// </summary> public Encoding Encode { get { return objEncoding; } set { objEncoding = value; } } /// <summary> /// 文檔中的表格 pdfv /// </summary> public List<HTMLTable> Tables { get { return table; } } /// <summary> /// 提供文檔中表格的索引訪問pdfv /// </summary> /// <param name="index">index</param> /// <returns>HTMLTable</returns> public HTMLTable this[int index] { get { try { return table[index]; } catch (Exception e) { throw e; } } } /// <summary> /// 提供文檔中表格的索引訪問 /// </summary> /// <param name="index">table index</param> /// <param name="subindex">tr index</param> /// <returns>HTMLTr</returns> public HTMLTr this[int index, int subindex] { get { try { return table[index].Rows[subindex]; } catch (Exception e) { throw e; } } } /// <summary> /// 提供文檔中表格的索引訪問 /// </summary> /// <param name="index">table index</param> /// <param name="subindex">tr index</param> /// <param name="subindex">td index</param> /// <returns>HTMLTd</returns> public HTMLTd this[int index, int subindex, int ssubindex] { get { try { return table[index].Rows[subindex].Cells[ssubindex]; } catch (Exception e) { throw e; } } } private Stream outStream; /// <summary> /// 提供格式化後的標準html文檔流，以供保存 /// </summary> public Stream OutputStream { get { return outStream; } set { outStream = value; } } /// <summary> /// 構造函數 /// </summary> public HTMLTableReader() { doc = new XmlDocument(); table = new List<HTMLTable>(); reader = new SgmlReader(); reader.DocType = "strict"; objEncoding = Encoding.Default; outStream = new MemoryStream(); } /// <summary> /// 析構函數 /// </summary> ~HTMLTableReader() { try { if (reader != null) { reader.Close(); } if (outStream != null) { outStream.Close(); } } catch (Exception e) { throw e; } } /// <summary> /// 釋放所有資源 /// </summary> public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } private void Dispose(bool disposing) { if (!this.disposed) { if (disposing) { component.Dispose(); } disposed = true; } } /// <summary> /// 從文件或URL中獲取加載dom /// </summary> /// <param name="filename">文件名或URL</param> /// <param name="encoding">編碼</param> public void Load(string filename,Encoding encoding) { Stream readstream = new MemoryStream(); if (Uri.IsWellFormedUriString(filename, UriKind.Absolute)) { using (WebClient web = new WebClient()) { try { web.Encoding = encoding; readstream = web.OpenRead(filename); Load(readstream, encoding); } catch (Exception e) { throw e; } finally { readstream.Close(); web.Dispose(); } } } else if (File.Exists(filename)) { using (FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read)) { try { Load(fs, encoding); } catch (Exception e) { throw e; } finally { fs.Close(); } } } else { throw new Exception("試圖訪問不存在的文件"); } } /// <summary> /// 從流設備中加載dom /// </summary> /// <param name="stream">流</param> /// <param name="encode">編碼</param> public void Load(Stream stream,Encoding encode) { using( StreamWriter output = new StreamWriter(outStream, encode) ){ using (XmlTextWriter writer = new XmlTextWriter(outStream, encode)) { try { reader.InputStream = new StreamReader(stream, encode); reader.WhitespaceHandling = WhitespaceHandling.None; writer.Formatting = Formatting.Indented; writer.WriteStartDocument(); //設置一個根節點 writer.WriteStartElement("root"); while (reader.Read()) { //獲取html節點 if (reader.NodeType == XmlNodeType.Element && reader.Name == "html") { XmlReader r = reader.ReadSubtree(); } else { if (reader.Name == null) { continue; } //寫入所有table節點 switch (reader.Name.ToLower()) { case "table": if(reader.NodeType == XmlNodeType.Element) writer.WriteNode(reader, true); break; case "": default: continue; } } } writer.WriteEndElement(); writer.WriteEndDocument(); writer.Flush(); writer.Close(); htmlBytes = ((MemoryStream)outStream).GetBuffer(); //編碼轉換 if (objEncoding != encode) { htmlBytes = Encoding.Convert(encode, objEncoding, htmlBytes, 0, htmlBytes.Length); } string xmltext = ReplaceLowOrderASCIICharacters(htmlBytes); doc.LoadXml(xmltext); getTable(); } catch (Exception e) { throw e; } finally { writer.Close(); output.Close(); } } } } /// <summary> /// 從字符串中加載dom /// </summary> /// <param name="xmltext">文本</param> /// <param name="encode">編碼</param> public void LoadXml(string xmltext,Encoding encode) { try { MemoryStream inputStream = new MemoryStream(encode.GetBytes(xmltext)); Load(inputStream, encode); } catch (Exception e) { throw e; } } /// <summary> /// 查找table /// </summary> private void getTable() { XmlNodeList tablelist = doc.GetElementsByTagName("table"); foreach (XmlNode _table in tablelist) { table.Add( new HTMLTable( _table)); } } /// <summary> /// 修復xml低位字符串無法解析的問題 /// </summary> /// <param name="buffer"></param> /// <returns></returns> private string ReplaceLowOrderASCIICharacters(byte[] buffer) { string tmp = objEncoding.GetString(buffer); StringBuilder info = new StringBuilder(); foreach (char cc in tmp) { int ss = (int)cc; if (((ss >= 0) && (ss <= 8)) || ((ss >= 11) && (ss <= 12)) || ((ss >= 14) && (ss <= 32))) info.AppendFormat(" ", ss);//&#x{0:X}; else info.Append(cc); } return info.ToString(); } } /// <summary> /// 代表一個html表格 /// </summary> public class HTMLTable : HTMLTag { private List<HTMLTr> tr; /// <summary> /// 代表表格中的行，tr /// </summary> public List<HTMLTr> Rows{ get{ return tr; } } /// <summary> /// 構造函數 /// </summary> /// <param name="node">xmlnode</param> public HTMLTable(XmlNode node) :base(node) { tr = new List<HTMLTr>(); getSubElement(node, Tag.tr); getDeep = false; foreach (XmlNode snode in subnodelist) { tr.Add(new HTMLTr(snode)); } } } /// <summary> /// 代表一個table中的行 /// </summary> public class HTMLTr : HTMLTag{ private List<HTMLTd> td; /// <summary> /// 代表行中的單元格，td /// </summary> public List<HTMLTd> Cells{ get{ return td; } } /// <summary> /// 構造函數 /// </summary> /// <param name="node">xmlnode</param> public HTMLTr(XmlNode node): base(node) { td = new List<HTMLTd>(); getSubElement(node, Tag.td); getDeep = false; foreach (XmlNode snode in subnodelist) { td.Add(new HTMLTd(snode)); } } } /// <summary> /// 代表一個table中的單元格 /// </summary> public class HTMLTd : HTMLTag{ public HTMLTd(XmlNode node):base(node) { } } /// <summary> /// 代表一個html標籤節點 /// </summary> public class HTMLTag : IDisposable { protected XmlNode node; protected bool getDeep = true; protected List<XmlNode> subnodelist; /// <summary> /// 標籤中的文字 /// </summary> public string Value { get { try { return node.InnerText; } catch (Exception) { return ""; } } } /// <summary> /// 標籤中的html文本 /// </summary> public string innerHTML { get { try { return node.InnerXml; } catch (Exception) { return ""; } } } /// <summary> /// 屬性索引器 /// </summary> /// <param name="attribute">指定屬性名</param> /// <returns>屬性值</returns> public string this[string attribute] { get { try { return node.Attributes[attribute].Value; } catch (Exception) { return ""; } } } /// <summary> /// 查找指定標籤名的子節點 /// </summary> /// <param name="tagname">標籤名</param> /// <returns>List<HTMLTag></returns> public virtual List<HTMLTag> this[Tag tagname] { get { try { getSubElement(node, tagname); List<HTMLTag> tags = new List<HTMLTag>(); foreach (XmlNode _node in subnodelist) { tags.Add(new HTMLTag(_node)); } return tags; } catch (Exception) { return new List<HTMLTag>(); } } } /// <summary> /// 根據tagname查找元素 /// </summary> /// <param name="tagname">標籤名</param> /// <returns>List<HTMLTag></returns> public virtual List<HTMLTag> GetElementsByTagName(Tag tagname) { return this[tagname]; } private XmlNode nodecopy; /// <summary> /// 根據id查找元素 /// </summary> /// <param name="id">id</param> /// <returns>HTMLTag</returns> public virtual HTMLTag GetElementByID(string id) { HTMLTag ht = new HTMLTag(nodecopy); foreach (XmlNode subnode in nodecopy.ChildNodes) { try { string nodeid = subnode.Attributes["id"].Value; { if (nodeid.ToLower() == id.ToLower()) { nodecopy = node; return new HTMLTag(subnode); } else { nodecopy = subnode; return GetElementByID(id); } } } catch (Exception) { continue; } } return ht; } /// <summary> /// 構造函數 /// </summary> /// <param name="node">節點</param> public HTMLTag(XmlNode node) { this.node = node; this.nodecopy = node; subnodelist = new List<XmlNode>(); } /// <summary> /// 查找子結點 /// </summary> /// <param name="parentnode">父節點</param> /// <param name="tagname">標籤名</param> protected void getSubElement(XmlNode parentnode,Tag tagname) { foreach (XmlNode subnode in parentnode.ChildNodes) { if (subnode.Name == tagname.ToString()) { subnodelist.Add(subnode); } if(getDeep && subnode.HasChildNodes) { getSubElement(subnode,tagname); } } } private bool disposed = false; private Component component = new Component(); /// <summary> /// 釋放所有資源 /// </summary> public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } private void Dispose(bool disposing) { if (!this.disposed) { if (disposing) { component.Dispose(); } disposed = true; } } } /// <summary> /// html標籤名枚舉 /// </summary> public enum Tag { a, abbr, acronym, address, applet, area, b, Base, basefont, bdo, big, blockquote, body, br, button, caption, center, cite, code, col, colgroup, dd, del, dfn, dir, div, dl, dt, em, fieldset, font, form, frame, frameset, h1, h2, h3, h4, h5, h6, head, hr, html, i, iframe, img, input, ins, isindex, kbd, label, legend, li, link, listing, map, menu, meta, noframes, noscript, Object, ol, optgroup, option, p, param, plaintext, pre, q, rb, rbc, rp, rt, rtc, ruby, s, samp, script, select, small, span, strike, strong, style, sub, sup, table, tbody, td, textarea, tfoot, th, thead, title, tr, tt, u, ul, var, xmp, nextid } |