一、使用說明:
1、http://htmlagilitypack.codeplex.com/下載類庫及API;
2、項目中引用using HtmlAgilityPack。
二、獲取上傳的文件流並根據文件編碼返回html根節點代碼展示(不包括htmlagilitypack文檔操作代碼):
Stream fileStream = context.Request.Files[0].InputStream; //獲取上傳的文件流
/// <summary>
/// 轉換stream爲HtmlNode並返回HtmlDocument根節點
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static HtmlNode streamToHtmlNode(Stream stream)
{
HtmlDocument doc = new HtmlDocument();
//獲取文件流編碼
Encoding encode = GetEncodeFromStream(stream);
stream.Position = 0;
doc.Load(stream,encode);
#region 移除html字符串中不必要的腳本、樣式、註釋代碼
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>
/// 給定的文件流,讀取文件的二進制數據,判斷文件的編碼類型
/// </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 }; //帶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>
/// 判斷字節數組是否是不帶BOM的UTF8格式
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static bool IsUTF8Bytes(byte[] data)
{
int charByteCounter = 1; //計算當前正分析的字符應還有的字節數
byte curByte; //當前分析的字節.
for (int i = 0; i < data.Length; i++)
{
curByte = data[i];
if (charByteCounter == 1)
{
if (curByte >= 0x80)
{
//判斷當前
while (((curByte <<= 1) & 0x80) != 0)
{
charByteCounter++;
}
//標記位首位若爲非0 則至少以2個1開始 如:110XXXXX...........1111110X
if (charByteCounter == 1 || charByteCounter > 6)
{
return false;
}
}
}
else
{
//若是UTF-8 此時第一位必須爲1
if ((curByte & 0xC0) != 0x80)
{
return false;
}
charByteCounter--;
}
}
if (charByteCounter > 1)
{
//throw new Exception("非預期的byte格式");
}
return true;
}