（六）lucene之其他查询方式（组合查询，制定数字范围、指定字符串开头）

• 本章使用的是lucene5.3.0

• 指定数字范围查询

package com.shyroke.test;

import java.io.IOException;
import java.nio.file.Paths;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.IntField;
import org.apache.lucene.document.StringField;
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.index.Term;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.NumericRangeQuery;
import org.apache.lucene.search.PrefixQuery;
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.junit.Before;
import org.junit.Test;

public class IndexTest {

    private Integer ids[]={1,2,3};
    private String citys[]={"aingdao","banjing","changhai"};
    private String descs[]={
            "Qingdao is a beautiful city.",
            "Nanjing is a city of culture.",
            "Shanghai is a bustling city."
    };

    private IndexReader reader;
    private IndexSearcher searcher;
    private String indexDir="E:\\lucene5\\index";

    @Before
    public void setUp() throws IOException {
        IndexWriter indexWriter = getIndexWiter();

        for (int i = 0; i < ids.length; i++) {
            Document document = new Document();
            document.add(new IntField("id", ids[i], Field.Store.YES));
            document.add(new StringField("city", citys[i], Field.Store.YES));
            document.add(new StringField("desc", descs[i], Field.Store.NO));
            indexWriter.addDocument(document);
        }

        indexWriter.close();

        Directory dir=FSDirectory.open(Paths.get(indexDir));
        reader=DirectoryReader.open(dir);
        searcher=new IndexSearcher(reader);

    }

    /**
     * 实例化IndexWiter
     *
     * @return
     * @throws IOException
     */
    private IndexWriter getIndexWiter() throws IOException {
        Directory dir = FSDirectory.open(Paths.get(indexDir));
        Analyzer analyzer = new StandardAnalyzer();
        IndexWriterConfig conf = new IndexWriterConfig(analyzer);
        IndexWriter indexWriter = new IndexWriter(dir, conf);

        return indexWriter;
    }

    /**
     * 指定数字范围,其中id必须是整型的，如：document.add(new IntField("id", ids[i], Field.Store.YES));
     * newIntRange方法第二、三个参数是查询的起点值和终点值，即区间，最后两个参数是指是否包含起点值和终点值。
     * @throws Exception
     */
    @Test
    public void testNumericRangeQuery()throws Exception{
        NumericRangeQuery<Integer> query=NumericRangeQuery.newIntRange("id", 1, 2, true, true);
        TopDocs hits=searcher.search(query, 10);
        for(ScoreDoc scoreDoc:hits.scoreDocs){
            Document doc=searcher.doc(scoreDoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
            System.out.println("---------------------");
        }
    }

}

• 结果：

解析：newIntRange("id", 1, 2, true, true); 该方法查询出id值为1和2之间的document，且包含1和2.因为desc设置为“Field.Store.NO”所以这里的值为null

• 指定字符串开头搜索

    /**
     * 指定字符串开头搜索
     * @throws Exception
     */
    @Test
    public void testPrefixQuery()throws Exception{
        PrefixQuery query=new PrefixQuery(new Term("city","a"));
        TopDocs hits=searcher.search(query, 10);
        for(ScoreDoc scoreDoc:hits.scoreDocs){
            Document doc=searcher.doc(scoreDoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
        }
    }
    

结果：

解：查询出city中以a为开头的document

• 多条件查询

    /**
     * 多条件查询
     * @throws Exception
     */
    @Test
    public void testBooleanQuery()throws Exception{
        NumericRangeQuery<Integer> query1=NumericRangeQuery.newIntRange("id", 1, 2, true, true);
        PrefixQuery query2=new PrefixQuery(new Term("city","a"));
        BooleanQuery.Builder booleanQuery=new BooleanQuery.Builder();
        booleanQuery.add(query1,BooleanClause.Occur.MUST);
        booleanQuery.add(query2,BooleanClause.Occur.MUST);
        TopDocs hits=searcher.search(booleanQuery.build(), 10);
        for(ScoreDoc scoreDoc:hits.scoreDocs){
            Document doc=searcher.doc(scoreDoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
        }
    }

解：查询出id值为1和2之间且city值以a开头的document