htmlagilitypack解析Html
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一、使用说明:
1、http://htmlagilitypack.codeplex.com/下载类库及API;
2、项目中引用using HtmlAgilityPack。
二、获取上传的文件流并根据文件编码返回html根节点代码展示(不包括htmlagilitypack文档操作代码):
Stream fileStream = context.Request.Files[0].InputStream; //获取上传的文件流 /// <summary> /// 转换stream为HtmlNode并返回HtmlDocument根节点 /// </summary> /// <param name="str"></param> /// <returns></returns> public static HtmlNode streamToHtmlNode(Stream stream) { HtmlDocument doc = new HtmlDocument(); //获取文件流编码 Encoding encode = GetEncodeFromStream(stream); stream.Position = 0; doc.Load(stream,encode); #region 移除html字符串中不必要的脚本、样式、注释代码 foreach (var script in doc.DocumentNode.Descendants("script").ToArray()) script.Remove(); foreach (var style in doc.DocumentNode.Descendants("style").ToArray()) style.Remove(); foreach (var comment in doc.DocumentNode.SelectNodes("//comment()").ToArray()) comment.Remove(); #endregion HtmlNode rootNode = doc.DocumentNode; return rootNode; } /// <summary> /// 给定的文件流,读取文件的二进制数据,判断文件的编码类型 /// </summary> /// <param name="fs"></param> /// <returns></returns> public static System.Text.Encoding GetEncodeFromStream(Stream fs) { byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 }; byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 }; byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM Encoding reVal = Encoding.Default; BinaryReader r = new BinaryReader(fs, System.Text.Encoding.Default); int i; int.TryParse(fs.Length.ToString(), out i); byte[] ss = r.ReadBytes(i); if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF)) { reVal = Encoding.UTF8; } else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00) { reVal = Encoding.BigEndianUnicode; } else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41) { reVal = Encoding.Unicode; } return reVal; } /// <summary> /// 判断字节数组是否是不带BOM的UTF8格式 /// </summary> /// <param name="data"></param> /// <returns></returns> public static bool IsUTF8Bytes(byte[] data) { int charByteCounter = 1; //计算当前正分析的字符应还有的字节数 byte curByte; //当前分析的字节. for (int i = 0; i < data.Length; i++) { curByte = data[i]; if (charByteCounter == 1) { if (curByte >= 0x80) { //判断当前 while (((curByte <<= 1) & 0x80) != 0) { charByteCounter++; } //标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X if (charByteCounter == 1 || charByteCounter > 6) { return false; } } } else { //若是UTF-8 此时第一位必须为1 if ((curByte & 0xC0) != 0x80) { return false; } charByteCounter--; } } if (charByteCounter > 1) { //throw new Exception("非预期的byte格式"); } return true; }
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