lucene的丰富的各种查询

lucene支持十分丰富的查询，这里列写其中一些比较常用的查询的用法。
term查询、queryParser查询 ,booleanQuery

package search;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class Searcher {
    public static void termQuery() throws Exception{
        Directory directory = FSDirectory.getDirectory("./index", false); 
        IndexSearcher searcher = new IndexSearcher(directory);
        Term t = new Term("body","document");
        Query query = new TermQuery(t);
        Hits hits = searcher.search(query);
        System.out.println(hits.length());
    }
    public static void queryParser() throws Exception{
        Directory directory = FSDirectory.getDirectory("./index", false); 
        IndexSearcher searcher = new IndexSearcher(directory);
        Query query = QueryParser.parse("text","body",new StandardAnalyzer());
        Hits hits = searcher.search(query);
        System.out.println(hits.length());
    }
    public static void booleanQuery() throws Exception{
        Query parseQuery = QueryParser.parse("text","body",new StandardAnalyzer());
        Term t = new Term("body","document");
        Query termQuery = new TermQuery(t);
        BooleanQuery boolQuery = new BooleanQuery();
        boolQuery.add(parseQuery,true,false);
        boolQuery.add(termQuery,true,false);
        
        Directory directory = FSDirectory.getDirectory("./index", false); 
        IndexSearcher searcher = new IndexSearcher(directory);
        Hits hits = searcher.search(boolQuery);
        System.out.println(hits.length());
    }
    public static void main(String[] args) throws Exception{
        termQuery();
        queryParser();
        booleanQuery();
    }
}

 

 

和上文一样，列写lucene的查询用法
包括了RangeQuery  prefixQuery  phraseQuery  wildcastQuery   fuzzyQuery
被索引查询的文件，按照需求自己构造即可。
package search;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.PhraseQuery;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.RangeQuery;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.WildcardQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;

public class SearcherShow {
    private static Directory directory = new RAMDirectory();
    public static void preIndex() throws Exception{
        String fileName1 = "./data/searchShow.txt";
        String fileName2 = "./data/searchShow2.txt";
        String fileName3 = "./data/test.txt";
        IndexWriter writer = new IndexWriter(directory,new StandardAnalyzer(),true);
        Document doc1 = getDocument(fileName1);
        Document doc2 = getDocument(fileName2);
        Document doc3 = getDocument(fileName3);
        writer.addDocument(doc1);
        writer.addDocument(doc2);
        writer.addDocument(doc3);
        writer.close();
        
    }
    //先建立索引才能执行
    
    //termQuery   rangeQuery   booleanQuery的查询在Searcher类中
    public static void rangeQuery() throws Exception{
        Term startTerm = new Term("lastmodified","20070620");
        Term endTerm = new Term("lastmodified","20070622");
        RangeQuery query = new RangeQuery(startTerm,endTerm,true);
        IndexSearcher searcher = new IndexSearcher(directory);
        Hits hits = searcher.search(query);
        prtHits(hits);
    }
    public static void prefixQuery() throws Exception{
        Term term = new Term("fileName","searchShow.txt");
        Term prefixterm = new Term("fileName","searchShow");
        IndexSearcher searcher = new IndexSearcher(directory);
        Query query = new TermQuery(term);
        Query prefixQuery = new PrefixQuery(prefixterm);
        Hits hits = searcher.search(query);
        Hits prefixHits = searcher.search(prefixQuery);
        prtHits(hits);
        System.out.println("----------");
        prtHits(prefixHits);
    }
    public static void phraseQuery() throws Exception{
        IndexSearcher searcher = new IndexSearcher(directory);
        PhraseQuery query = new PhraseQuery();
        query.setSlop(2);
        query.add(new Term("contents","quick"));
        query.add(new Term("contents","fox"));
        Hits hits = searcher.search(query);
        prtHits(hits);
    }
    public static void wildcardQuery() throws Exception{
        IndexSearcher searcher = new IndexSearcher(directory);
        Query query = new WildcardQuery(new Term("contents","?ild*"));
        Hits hits = searcher.search(query);
        prtHits(hits);
    }
    public static void fuzzyQuery() throws Exception{
        IndexSearcher searcher = new IndexSearcher(directory);
        Term term = new Term("contents","wuzza");
        FuzzyQuery query = new FuzzyQuery(term);
        Hits hits = searcher.search(query);
        prtHits(hits);
    }
    public static Document getDocument(String fileName) throws Exception{
        File file = new File(fileName);
        Document doc = new Document();
        doc.add(Field.Keyword("fileName",file.getName() ));
        Date modified = new Date(file.lastModified());
        String lastmodified = new SimpleDateFormat("yyyyMMdd").format(modified);
        doc.add(Field.Keyword("lastmodified", lastmodified));
        BufferedReader br = new BufferedReader(new InputStreamReader(
                new FileInputStream(file)));
        StringBuffer sb = new StringBuffer();
        String line = null;
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }
        br.close();
        doc.add(Field.Text("contents",sb.toString() ));
        return doc;
    }
    public static void prtHits(Hits hits) throws Exception{
        for(int i=0;i<hits.length();i++){
            Document doc = hits.doc(i);
            System.out.println(doc.get("fileName"));
            System.out.println(doc.get("lastmodified"));
        }
    }
    public static void main(String[] args) throws Exception{
        preIndex();
//        rangeQuery();
//        prefixQuery();
//        phraseQuery();
//        wildcardQuery();
        fuzzyQuery();
    }
}