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Lucene 4.* QueryParser Range Searcher （范围查询）
由于Lucene4.9.1的QueryParser支持类似Solr的范围检索（ FL:[ 111 TO 222] ） 但是实际中会出现不准确的现象。
这是由于QueryParser 把范围查询当做String类型。而无论索引时使用LongField 和 TextField 都会出现不准确问题。
解决办法是手动将范围检索改成long类型或int类型。
1 自定义QueryParser 。
public class RangeQueryParser extends QueryParser { public RangeQueryParser(Version matchVersion, String f, Analyzer a) { super(matchVersion, f, a); } @Override protected Query getRangeQuery(String field, String part1, String part2, boolean arg3, boolean arg4) throws ParseException { try { long num1 = Long.parseLong(part1); long num2 = Long.parseLong(part2); return NumericRangeQuery.newLongRange(field, num1, num2, true, true); } catch (NumberFormatException e) { throw new ParseException(e.getMessage()); } }}
2 使用方法：
package org.bidlink.index;import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import org.apache.lucene.document.Document;import org.apache.lucene.document.Field.Store;import org.apache.lucene.document.LongField;import org.apache.lucene.document.TextField;import org.apache.lucene.index.DirectoryReader;import org.apache.lucene.index.IndexReader;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.index.IndexWriterConfig;import org.apache.lucene.queryparser.classic.QueryParser;import org.apache.lucene.search.IndexSearcher;import org.apache.lucene.search.ScoreDoc;import org.apache.lucene.search.TopDocs;import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;import org.wltea.analyzer.lucene.IKAnalyzer;import com.bidlink.general.index.RangeQueryParser;import com.bidlink.general.index.SearcherCallBack;import com.bidlink.general.index.WordBankConst;public class TestIndex { public void index() throws Exception { Directory d = FSDirectory.open(new File("Index")); IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_4_9, new IKAnalyzer()); IndexWriter iw = new IndexWriter(d, iwc); Document doc = new Document(); doc.add(new TextField("WORD", "测试北京市第102个", Store.YES)); doc.add(new LongField("ENDDATE", 1234556L, Store.YES)); iw.addDocument(doc); iw.commit(); iw.close(); } public void search(String fl, String word, SearcherCallBack callBack) throws Exception { Directory d = FSDirectory.open(new File("Index")); IndexReader r = DirectoryReader.open(d); IndexSearcher s = new IndexSearcher(r); callBack.maxDocs = s.getIndexReader().maxDoc(); callBack.numDocs = s.getIndexReader().numDocs(); QueryParser qp = new RangeQueryParser(Version.LUCENE_4_9, fl, new IKAnalyzer()); qp.setDefaultOperator(QueryParser.Operator.AND); try { TopDocs tdocs = s.search(qp.parse(word), 1000); callBack.numFound = tdocs.totalHits; ScoreDoc scoreDocs[] = tdocs.scoreDocs; for (ScoreDoc sDoc : scoreDocs) { int docNumber = sDoc.doc; Document doc = s.doc(docNumber); callBack.process(doc); } } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) throws Exception { SearcherCallBack s = new SearcherCallBack() { @Override public void process(Document doc) { // System.out.println(doc.getField(WordBankConst.ID).stringValue()); System.out.println(doc.getField(WordBankConst.WORD).stringValue()); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date = sdf.format(new Date(Long.parseLong(doc.getField(WordBankConst.ENDDATE).stringValue()))); System.out.println(Long.parseLong(doc.getField(WordBankConst.ENDDATE).stringValue()) + " " + date); } }; TestIndex index = new TestIndex(); // index.index(); index.search("", "WORD:地铁 AND ENDDATE:[1111 TO 222222222222 ]", s); System.out.println("Doc numFound ： " + s.numFound + " Max Doc num :" + s.maxDocs); }}
Lucene 4.* QueryParser Range Searcher （范围查询）
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