asp.net C# 關鍵字過濾程式碼

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上載者:User
 代碼如下 複製代碼

例1

  /// <summary>
        /// 過濾關鍵字
        /// </summary>
        /// <param name="value">過濾字眼,用| 隔開</param>
        /// <param name="text">傳入要過濾的資料</param>
        /// <returns></returns>
        public List<string> FriterText(string value, string text)
        {
            List<string> FriterList = new List<string>();
            String regex = string.Format("({0})", value);
            //String regex = "(插你|企業|企業家)";
            Regex rg = new Regex(regex);
            if (rg.IsMatch(text))
            {
                MatchCollection mc = rg.Matches(text);
                foreach (var item in mc)
                {
                    if (!FriterList.Contains(item.ToString()))
                        FriterList.Add(item.ToString());
                }
            }
            return FriterList;
        }

例1


class Program
{
static void Main(string[] args)
{
string keys = "雲風部落格|並發問題|最爛的方法|記憶體|集合|資料庫|效能";

using (new OperationTimer("keyWords:"))
{
WordSearch ws = new WordSearch(keys);
string str = "看雲風部落格關於解決12306並發問題的啟發:我現在做駿卡介面,可能出現並發問題,就是一個訂單可能向我們的介面發送多個請求,而我現在做的方法是去資料庫中對應的表驗證,看訂單是否存在,如果存在就提示一下,如果不存在按流程走,但是這個樣每來一個訂單我都需要去資料庫查,如果我在記憶體中維護一個訂單集合,這樣就能很快解決判斷訂單是否存在的問題,慣性思維太嚴重了,什麼都去資料庫查,這樣的效能是最差的,其實很多問題在記憶體中就可以搞定的,最近還有一個特別感受,不要做井底之蛙,多看牛人的東西收穫真的比自己埋頭寫代碼進步快很多,其實很多時候我寫的程式效能差,效率低都是因為方法的原因,沒有找到好的方法,沒有靈光一閃的感覺,用了最爛的方法解決問題";
ConsoleColor color = Console.ForegroundColor;
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("原文:");
Console.ForegroundColor = color;
Console.WriteLine(str);
Console.WriteLine();
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("過濾後:");
Console.ForegroundColor = color;
Console.WriteLine(ws.Filter(str));
}
Console.Read();
}
}


例3

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Collections;

namespace BLL.Common
{
    #region 操作類
    public class KeywordsFilter
    {
       

        #region 關鍵字過濾
        /// <summary>
        /// 關鍵字過濾
        ///
        /// </summary>
        /// <param name="keywords"></param>
        /// <returns></returns>
        public static string Filter(string keywords)
        {
 
            //需過濾關鍵字集合
            List<string> badwords = new List<string>();
           
            KeywordsFilterClass kf = new KeywordsFilterClass();
            keywords = kf.BadwordInKeywords(keywords, badwords);
            return keywords;
        }
        #endregion

    }
    #endregion

    #region 關鍵字過濾類
    /// <summary>
    /// 關鍵字過濾類
    /// </summary>
    public class KeywordsFilterClass
    {

        private Dictionary<string, object> hash = new Dictionary<string, object>();
        //髒字字典 開頭髒字儲存
        private BitArray firstCharCheck = new BitArray(char.MaxValue);
        //髒字字典 單個char儲存
        private BitArray allCharCheck = new BitArray(char.MaxValue);
        private int maxLength = 0;

        /// <summary>
        /// 初始化 已儲存的 過濾字串
        /// </summary>
        /// <param name="words"></param>
        private void InitHash(List<string> badwords)
        {
            foreach (string word in badwords)
            {
                //儲存字典內不存在的髒字
                if (!hash.ContainsKey(word))
                {
                    hash.Add(word, null);
                    //設定髒字計算長度
                    this.maxLength = Math.Max(this.maxLength, word.Length);
                    firstCharCheck[word[0]] = true;
                    foreach (char c in word)
                    {
                        allCharCheck[c] = true;
                    }
                }
            }

        }
        /// <summary>
        /// 替換字串中的髒字為指定的字元
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public string BadwordInKeywords(string text, List<string> badwords)
        {
            //初始化 髒字字典
            this.InitHash(badwords);
            int index = 0;

            while (index < text.Length)
            {
                //判斷開頭髒字
                if (!firstCharCheck[text[index]])
                {
                    //未找到開頭髒字 則索引累加
                    while (index < text.Length - 1 && !firstCharCheck[text[++index]]) ;
                }
                for (int j = 1; j <= Math.Min(maxLength, text.Length - index); j++)
                {
                    if (!allCharCheck[text[index + j - 1]])
                    {
                        break;
                    }
                    string sub = text.Substring(index, j);

                    if (hash.ContainsKey(sub))
                    {
                        text = text.Replace(sub, "**");
                        //this.InitHash(badwords);
                        index += j;
                        break;
                    }
                }

                index++;
            }
            return text;
        }


    }
    #endregion
}

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