最近在写一些搜索的东西，用LUCENE.NET2.9，学得不多，但是有进步。好吧，我表示，未来我可以写的更好！
1 using System; 2 using System.IO; 3 using Lucene.Net.QueryParsers; 4 using Lucene.Net.Analysis; 5 using Lucene.Net.Analysis.Standard; 6 using Lucene.Net.Documents; 7 using Lucene.Net.Index; 8 using Lucene.Net.Search; 9 using Lucene.Net.Store; 10 using System.Xml; 11 namespace DianJiangTai.searchEngine 12 { 13 public class SearchTools 14 { 15 //public Analyzer analyzer; 16 // public IndexReader reader; 17 // public TopScoreDocCollector collector; 18 public IndexSearcher isearcher; 19 public static int searchItemCount=1000;//搜索时提取结果中前100条记录 20 public static int startIndex = 0;//每页开始的位置 21 public static int endIndex = 0;//每页结束的位置 22 public static int pageSize =6;//页容量 23 public static string[] resQuee = new string[50]; 24 public static int front = 0, rear = 0,Queelength=0; 25 private int resCount; 26 27 /* private string readIndexPath() 28 { 29 // string path=System.Configuration.ConfigurationSettings.AppSettings.Get("IndexPath"); 30 // return path; 31 XmlDocument xmlDoc = new XmlDocument(); 32 xmlDoc.Load("http://www.cnblogs.com/../searchIndex.xml"); 33 XmlNode root = xmlDoc.SelectSingleNode("indexPath"); 34 XmlNodeList subNode = root.ChildNodes; 35 XmlElement xe2 = (XmlElement)subNode[0]; 36 XmlNode sub = xe2.FirstChild; 37 return sub.InnerText.Trim(); 38 } 39 */ 40 41 public SearchTools() 42 { 43 //string path = readIndexPath(); 44 } 45 private bool push(string res) 46 { 47 if ((rear + 1) % 50 != front) 48 { 49 resQuee[rear] = res; 50 rear=(rear+1)%50; 51 Queelength++; 52 return true; 53 } 54 else 55 return false; 56 } 57 private string pop() 58 { 59 if (rear != front) 60 { 61 string temp= resQuee[front]; 62 front = (front + 1) % 50; 63 Queelength--; 64 return temp; 65 } 66 else 67 return null; 68 } 69 /* 70 private string pop(int id) 71 { 72 if (rear != front) 73 { 74 string temp = resQuee[id]; 75 return temp; 76 } 77 else 78 return null; 79 } 80 private bool ifQueeNULL() 81 { 82 if (Queelength <= 0) 83 return true; 84 else return false; 85 } 86 public static bool ifNeedAnotherRead=false; 87 /* 88 private void searchAll(string[] querystr) 89 { 90 bool ifNULL = true; 91 int length = querystr.Length; 92 if (length <= 0) return; 93 isearcher = new IndexSearcher(reader); 94 ScoreDoc[] hits; 95 int j; 96 97 if(!ifNeedAnotherRead) 98 { 99 BooleanQuery query = new BooleanQuery(); 100 for (j = length; j >= 2; j--) 101 { 102 for (int i = 0; i < j; i++) 103 { 104 TermQuery tempTerm = new TermQuery(new Term("indexItem", querystr[i])); 105 query.Add(tempTerm, BooleanClause.Occur.SHOULD); 106 } 107 collector = TopScoreDocCollector.create(isearcher.MaxDoc(), false); 108 isearcher.Search(query, collector); 109 hits = collector.TopDocs().scoreDocs; 110 if (hits.Length <= 0) 111 continue; 112 else 113 { 114 if (hits.Length <= 3*endIndex) 115 { 116 endIndex = hits.Length; 117 ifNeedAnotherRead = true; 118 WriteIntoCache(isearcher,hits,startIndex,endIndex); 119 startIndex = 0; 120 endIndex = startIndex + pageSize; 121 } 122 else 123 { 124 ifNeedAnotherRead = false; 125 WriteIntoCache(isearcher,hits,startIndex,endIndex * 3); 126 startIndex = endIndex * 3; 127 endIndex = startIndex + pageSize; 128 } 129 ifNULL = false; 130 } 131 } 132 } 133 if(ifNeedAnotherRead || ifNULL) 134 { 135 QueryParser parser = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "indexItem", analyzer);//indexItem 136 for (j = 0; j < length; j++) 137 { 138 if (querystr[j].Trim().Equals("") || querystr[j] == null) 139 continue; 140 Query querySingle = parser.Parse(querystr[j]); 141 collector = TopScoreDocCollector.create(isearcher.MaxDoc(), false); 142 isearcher.Search(querySingle, collector); 143 hits = collector.TopDocs().scoreDocs; 144 if (hits.Length <= 0) 145 { 146 continue; 147 } 148 else 149 { 150 int leftSize=50-Queelength; 151 if (hits.Length >leftSize) 152 { 153 WriteIntoCache(isearcher,hits,startIndex,startIndex+leftSize); 154 startIndex =leftSize;//要记下结束的位置 155 endIndex = startIndex + pageSize; 156 } 157 else 158 { 159 WriteIntoCache(isearcher,hits,startIndex,hits.Length); 160 startIndex = 0;//要记下结束的位置 161 endIndex = startIndex + pageSize; 162 } 163 ifNULL = false; 164 } 165 } 166 } 167 isearcher.Close(); 168 if (ifNULL) 169 { 170 Console.WriteLine("搜索失败！"); 171 } 172 } 173 */ 174 public string[] StartSearch(string[] queryString, int searchType, int currentPage) 175 { 176 if (queryString.Length <= 0) return null; 177 178 // string path = System.Configuration.ConfigurationManager.AppSettings.Get("IndexPath"); 179 // if (path == null || path.Equals("")||!File.Exists(path)) 180 // return null; 181 string path = "G:/project/index"; 182 front = 0; rear = 0; Queelength = 0; resCount = 0; 183 startIndex = (currentPage - 1) * pageSize; 184 endIndex = startIndex + pageSize * 2; 185 Analyzer analyzer=null; 186 IndexReader reader=null; 187 try 188 { 189 190 reader = IndexReader.Open(FSDirectory.Open(new System.IO.DirectoryInfo(path)), true); 191 analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29); 192 isearcher = new IndexSearcher(reader); 193 QueryParser parser = null; 194 switch (searchType) 195 { 196 case 1: parser = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "indexItem", analyzer);//search anthing containing any part of the key word 197 searchByall(queryString, "indexItem"); 198 searchByItem(queryString, parser); 199 break; 200 case 2: parser = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "DrugName", analyzer); //search by product 201 searchByItem(queryString, parser); 202 break; 203 case 3: parser = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "OrgName", analyzer); //search by company 204 searchByItem(queryString, parser); 205 break; 206 } 207 } 208 catch (Exception e) 209 {} 210 211 isearcher.Close(); 212 analyzer.Close(); 213 reader.Clone(); 214 215 string res = null; 216 while (Queelength > 0) 217 { 218 res = res + pop() + "~"; 219 } 220 res = res + resCount.ToString()+"~"+"end"; 221 if (res == null) 222 return null; 223 else 224 return res.Split('~'); 225 } 226 227 private void searchByall(string[] querystr,string fieldName) 228 { 229 int length = querystr.Length; 230 // bool ifNULL = true; 231 ScoreDoc[] hits; 232 int j; 233 BooleanQuery query; 234 TopScoreDocCollector collector; 235 for (j = length-1; j >= 2; j--) 236 { 237 query = new BooleanQuery(); 238 for (int i = 0; i < j; i++) 239 { 240 TermQuery tempTerm = new TermQuery(new Term("indexItem", querystr[i])); 241 BooleanClause clause=new BooleanClause(tempTerm ,BooleanClause.Occur.SHOULD); 242 query.Add(clause); 243 //query.Add(tempTerm, BooleanClause.Occur.SHOULD); 244 } 245 collector = TopScoreDocCollector.create(isearcher.MaxDoc(), false); 246 isearcher.Search(query ,collector); 247 hits = collector.TopDocs().scoreDocs; 248 resCount =resCount+ hits.Length; 249 if (hits.Length < startIndex) 250 { 251 return; 252 } 253 else 254 if (hits.Length <= 0) 255 continue; 256 else 257 { 258 if (hits.Length < endIndex) 259 { 260 WriteIntoCache(isearcher, hits, startIndex, hits.Length); 261 } 262 else 263 { 264 WriteIntoCache(isearcher, hits, startIndex, endIndex); 265 } 266 // ifNULL = false; 267 } 268 } 269 isearcher.Close(); 270 // if (ifNULL) 271 // { 272 // Console.WriteLine("搜索失败！"); 273 // } 274 275 } 276 private void searchByItem(string[] Productstring, QueryParser parser) 277 { 278 int length = Productstring.Length; 279 // bool ifNULL = true; 280 ScoreDoc[] hits; 281 TopScoreDocCollector collector; 282 int j; 283 for (j = 0; j < length; j++) 284 { 285 if (Productstring[j].Trim().Equals("") || Productstring[j] == null) 286 continue; 287 Query querySingle = parser.Parse(Productstring[j]); 288 collector = TopScoreDocCollector.create(isearcher.MaxDoc(), false); 289 isearcher.Search(querySingle, collector); 290 hits = collector.TopDocs().scoreDocs; 291 resCount = resCount + hits.Length; 292 if (hits.Length < startIndex) 293 { 294 return; 295 } 296 else 297 if (hits.Length <= 0) 298 { 299 continue; 300 } 301 else 302 { 303 if (hits.Length > endIndex) 304 { 305 WriteIntoCache(isearcher, hits, startIndex, endIndex); 306 } 307 else 308 { 309 WriteIntoCache(isearcher, hits, startIndex, hits.Length); 310 } 311 // ifNULL = false; 312 } 313 } 314 isearcher.Close(); 315 // if (ifNULL) 316 // { 317 // Console.WriteLine("搜索失败！"); 318 // } 319 } 320 321 private void WriteIntoCache(IndexSearcher isearcher, ScoreDoc[] hits, int start, int end) 322 { 323 string temp = ""; 324 for (int i = start; i < end; i++) 325 { 326 try 327 { 328 Document hitDoc = isearcher.Doc(hits[i].doc); 329 temp = hitDoc.Get("ObjectID") + "^" + hitDoc.Get("Title") + "^" + hitDoc.Get("Summary") + "^" + hitDoc.Get("JingBiaoStartTime") + "^" + hitDoc.Get("CreateTime") + "^" + hitDoc.Get("OrgName") + "^" + hitDoc.Get("Status"); 330 if (!push(temp)) 331 break; 332 } 333 catch(Exception e) 334 { 335 return; 336 } 337 } 338 } 339 /* 340 public static int pageCount; 341 public string[] getSearchResult(string[] query, int page,int ifNextPageOrNewSearch) 342 { 343 344 if (ifQueeNULL() || ifNextPageOrNewSearch == 1) 345 { 346 front = 0; 347 rear = 0; 348 Queelength = 0; 349 searchAll(query); 350 pageCount = Queelength / pageSize; 351 if (Queelength % pageSize != 0) 352 pageCount++; 353 } 354 string res = null; 355 if (page <= pageCount) 356 { 357 // if (page > 5) 358 // search(query); 359 int pos = (front + (page - 1) * pageSize) % 50; 360 for (int i = pos; i < pos + pageSize; i++) 361 { 362 if (i >= Queelength) break; 363 res = res + pop(i) + "~"; 364 } 365 return res.Split('~'); 366 } 367 else 368 return null; 369 }*/ 370 } 371 }