C# 添加敏感词

       public class CheckStreamReader

	{

        //使用的数据：

        private static HashSet<string> hash = new HashSet<string>();

        private byte[] fastCheck = new byte[char.MaxValue];

        private BitArray charCheck = new BitArray(char.MaxValue);

        private int maxWordLength = 0;

        private int minWordLength = int.MaxValue;

        private static string[] badwords = { };





        public CheckStreamReader()

        {

            if (hash == null || hash.Count <= 0)

            {

                //添加敏感词

                string path = HttpContext.Current.Server.MapPath("~/config") + "/StreamReader.txt";

                StreamReader sr = new StreamReader(path, Encoding.GetEncoding("utf-8"));

                string strText = sr.ReadToEnd();

                badwords = strText.Split('|');

                InitializationText();

            }

        }





        //初始化数据的代码：将敏感词加入的hash表中

        private void InitializationText()

        {

            foreach (string word in badwords)

            {

                maxWordLength = Math.Max(maxWordLength, word.Length);

                minWordLength = Math.Min(minWordLength, word.Length);



                for (int i = 0; i < 7 && i < word.Length; i++)

                {

                    fastCheck[word[i]] |= (byte)(1 << i);

                }



                for (int i = 7; i < word.Length; i++)

                {

                    fastCheck[word[i]] |= 0x80;

                }



                if (word.Length == 1)

                {

                    charCheck[word[0]] = true;

                }

                else

                {

                    hash.Add(word);

                }

            }

        }



        //判断是否包含脏字的代码：

        public bool HasBadWord(string text)

        {

            if (hash == null || hash.Count<=0)

            {

                string path = HttpContext.Current.Server.MapPath("~/" + ConfigurationManager.AppSettings["ConfigPath"]) + "/StreamReader.txt";

                StreamReader sr = new StreamReader(path, Encoding.GetEncoding("utf-8"));

                string strText = sr.ReadToEnd();

                badwords = strText.Split('|');

                InitializationText();

            }



            int index = 0;



            while (index < text.Length)

            {

                if ((fastCheck[text[index]] & 1) == 0)

                {

                    while (index < text.Length - 1 && (fastCheck[text[++index]] & 1) == 0) ;

                }



                if (minWordLength == 1 && charCheck[text[index]])

                {

                    return true;

                }



                for (int j = 1; j <= Math.Min(maxWordLength, text.Length - index - 1); j++)

                {

                    if ((fastCheck[text[index + j]] & (1 << Math.Min(j, 7))) == 0)

                    {

                        break;

                    }



                    if (j + 1 >= minWordLength)

                    {

                        string sub = text.Substring(index, j + 1);



                        if (hash.Contains(sub))

                        {

                            return true;

                        }

                    }

                }



                index++;

            }



            return false;

        }

	}