lucene的丰富的各种查询(一)

lucene的丰富的各种查询(一)

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();
    }
}