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lucene同义词的索引-创新互联

public interface SynonymEngine {     String[] getSynonyms(String key); } public class SynonymEngineImpl implements SynonymEngine {          private static HashMap map = new HashMap();     static {         map.put("quick",new String[]{"fast","speedy"});         map.put("jumps",new String[]{"leaps","hops"});         map.put("over",new String[]{"above"});         map.put("lazy",new String[]{"apathetic","sluggish"});         map.put("dog",new String[]{"canine","pooch"});     }     @Override     public String[] getSynonyms(String key) {         // TODO Auto-generated method stub         return map.get(key);     } } public class SynonymFilter extends TokenFilter {     private SynonymEngine engine;     private CharTermAttribute ct;     private PositionIncrementAttribute pt;     private Stack stack;     private AttributeSource.State current;     protected SynonymFilter(TokenStream input,SynonymEngine engine) {         super(input);         this.engine = engine;         ct = this.addAttribute(CharTermAttribute.class);         pt = this.addAttribute(PositionIncrementAttribute.class);         stack  = new Stack();     }     @Override     public boolean incrementToken() throws IOException {         if(stack.size()>0) {             this.restoreState(current);             String p = stack.pop();             ct.setEmpty();             ct.append(p);             pt.setPositionIncrement(0);             return true;         }         System.out.println("++++++"+ct);         if(!input.incrementToken()) return false;         System.out.println("------"+ct);                  if(addSynonym(ct.toString())) {             current = this.captureState();                      }                                             return true;     }          private boolean addSynonym(String name) {         String[] sa = engine.getSynonyms(name);         if(sa != null && sa.length>0) {             for(String s:sa) {                 stack.push(s);             }             return true;         } else {             return false;         }     } } public class SynonymAnalyzer extends Analyzer {     private SynonymEngine engine;          public SynonymAnalyzer(SynonymEngine engine) {         this.engine = engine;     }     @Override     public TokenStream tokenStream(String s, Reader reader) {         // TODO Auto-generated method stub         return new SynonymFilter(new StopFilter(Version.LUCENE_35,                 new LowerCaseFilter(Version.LUCENE_35,                         new StandardFilter(Version.LUCENE_35,                                 new StandardTokenizer(Version.LUCENE_35,reader)))                 ,StopAnalyzer.ENGLISH_STOP_WORDS_SET),engine);     } } public class TestSynonym {     private RAMDirectory directory;     @Test     public void init() {         directory = new RAMDirectory();         SynonymEngine engine = new SynonymEngineImpl();         IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_35,new SynonymAnalyzer(engine));         String content = "The quick brown fox jumps over the lazy dog";                  try {             IndexWriter writer = new IndexWriter(directory,config);             Document doc = new Document();             doc.add(new Field("content",content,Field.Store.YES,Field.Index.ANALYZED));             writer.addDocument(doc);             writer.close();                          IndexReader reader = IndexReader.open(directory);             IndexSearcher searcher = new IndexSearcher(reader);             TopDocs docs = searcher.search(new TermQuery(new Term("content","pooch")),10);             for(ScoreDoc sd:docs.scoreDocs) {                 Document d = searcher.doc(sd.doc);                 System.out.println(d.get("content"));             }                      } catch (CorruptIndexException e) {             // TODO Auto-generated catch block             e.printStackTrace();         } catch (LockObtainFailedException e) {             // TODO Auto-generated catch block             e.printStackTrace();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     } }

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