Lucene其他查询方式

1. 指定项范围查询TermRangeQuery

2. 指定数字范围查询NumericRangeQuery

3. 指定字符串开头搜索PrefixQuery

4. 组合查询BooleanQuery

New maven project ->
Create a simple project ->
    Group Id: com.andrew.lucene
    Artifact Id: Lucene04
    Version: 0.0.1-SNAPSHOT
    Packaging: jar

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.andrew.lucene</groupId>
  <artifactId>Lucene04</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <dependencies>
      <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-core</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-queryparser</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.lucene</groupId>
        <artifactId>lucene-analyzers-common</artifactId>
        <version>5.3.1</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
  </dependencies>
</project>

Indexer.java代码

package com.andrew.lucene;

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.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class Indexer {
    private Integer ids[] = { 1, 2, 3 };
    private String citys[] = { "aingdao", "banjing", "changhai" };
    private String descs[] = { "Qingdao is b beautiful city.", "Nanjing is c city of culture.",
            "Shanghai is d bustling city." };
    private Directory dir;
    // 获取IndexWriter实例
    private IndexWriter getWriter() throws Exception {
        Analyzer analyzer = new StandardAnalyzer(); // 标准分词器
        IndexWriterConfig iwc = new IndexWriterConfig(analyzer);
        IndexWriter writer = new IndexWriter(dir, iwc);
        return writer;
    }
    // 生成索引
    private void index(String indexDir) throws Exception {
        dir = FSDirectory.open(Paths.get(indexDir));
        IndexWriter writer = getWriter();
        for (int i = 0; i < ids.length; i++) {
            Document doc = new Document();
            doc.add(new IntField("id", ids[i], Field.Store.YES));
            doc.add(new StringField("city", citys[i], Field.Store.YES));
            doc.add(new TextField("desc", descs[i], Field.Store.YES));
            writer.addDocument(doc); // 添加文档
        }
        writer.close();
    }
    public static void main(String[] args) throws Exception {
        new Indexer().index("E:\\lucene5");
    }
}

SearchTest.java代码

package com.andrew.lucene;

import java.nio.file.Paths;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
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.TermRangeQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.BytesRef;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class SearchTest {
    private Directory dir;
    private IndexReader reader;
    private IndexSearcher is;
    @Before
    public void setUp() throws Exception {
        dir = FSDirectory.open(Paths.get("E:\\lucene5"));
        reader = DirectoryReader.open(dir);
        is = new IndexSearcher(reader);
    }
    @After
    public void tearDown() throws Exception {
        reader.close();
    }
    // 指定项范围搜索
    @Test
    public void testTermRangeQuery() throws Exception {
        TermRangeQuery query = new TermRangeQuery("desc", new BytesRef("b".getBytes()), new BytesRef("c".getBytes()), true, true);
        TopDocs hits = is.search(query, 10);
        for (ScoreDoc scoreDoc : hits.scoreDocs) {
            Document doc = is.doc(scoreDoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
        }
    }
    // 指定数字范围
    @Test
    public void testNumericRangeQuery() throws Exception {
        NumericRangeQuery<Integer> query = NumericRangeQuery.newIntRange("id", 1, 2, true, true);
        TopDocs hits = is.search(query, 10);
        for (ScoreDoc scoreDoc : hits.scoreDocs) {
            Document doc = is.doc(scoreDoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
        }
    }
    // 指定字符串开头搜索
    @Test
    public void testPrefixQuery() throws Exception {
        PrefixQuery query = new PrefixQuery(new Term("city", "a"));
        TopDocs hits = is.search(query, 10);
        for (ScoreDoc scoreDoc : hits.scoreDocs) {
            Document doc = is.doc(scoreDoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
        }
    }
    // 多条件查询
    @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 = is.search(booleanQuery.build(), 10);
        for (ScoreDoc scoreDoc : hits.scoreDocs) {
            Document doc = is.doc(scoreDoc.doc);
            System.out.println(doc.get("id"));
            System.out.println(doc.get("city"));
            System.out.println(doc.get("desc"));
        }
    }
}

运行结果：

1
aingdao
Qingdao is b beautiful city.
2
banjing
Nanjing is c city of culture.
3
changhai
Shanghai is d bustling city.

1
aingdao
Qingdao is b beautiful city.
2
banjing
Nanjing is c city of culture.

1
aingdao
Qingdao is b beautiful city.

1
aingdao
Qingdao is b beautiful city.