Lucene介绍及简单入门案例（集成ik分词器）

<dependency>
    <groupId>org.apache.lucenegroupId>
    <artifactId>lucene-coreartifactId>
    <version>4.10.2version>
dependency>
<dependency>
    <groupId>org.apache.lucenegroupId>
    <artifactId>lucene-queriesartifactId>
    <version>4.10.2version>
dependency>
<dependency>
    <groupId>org.apache.lucenegroupId>
    <artifactId>lucene-test-frameworkartifactId>
    <version>4.10.2version>
dependency>
<dependency>
    <groupId>org.apache.lucenegroupId>
    <artifactId>lucene-analyzers-commonartifactId>
    <version>4.10.2version>
dependency>
<dependency>
    <groupId>org.apache.lucenegroupId>
    <artifactId>lucene-queryparserartifactId>
    <version>4.10.2version>
dependency>
<dependency>
    <groupId>org.apache.lucenegroupId>
    <artifactId>lucene-highlighterartifactId>
    <version>4.10.2version>
dependency>    

public class LuceneIndex {
    public static void main(String[] args) throws IOException {
        //1 创建indexwriter对象
        //1.1 创建索引库
        FSDirectory directory = FSDirectory.open(new File("H:\\test"));
        //1.2 创建写入器配置对象 参数1 版本号, 参数2 分词器
        IndexWriterConfig cOnfig= new IndexWriterConfig(Version.LATEST, new StandardAnalyzer());
        //1.3 创建indexwriter对象
        IndexWriter indexWriter = new IndexWriter(directory, config);

        //2 写入文档
        //2.1 创建文档对象(lucene的document对象)
        Document document = new Document();
        //2.2 添加文档属性(字段)   new xxxField(字段名,字段值,是否保存)
        document.add(new IntField("id", 1, Field.Store.YES));
        document.add(new StringField("title", "Lucene介绍", Field.Store.YES));
        document.add(new TextField("content", "Lucene是一个全文检索的工具包", Field.Store.YES));
        //2.3 写入文档
        indexWriter.addDocument(document);

        //3 提交数据
        indexWriter.commit();

        //释放资源
        indexWriter.close();
    }
}

<dependency>
    <groupId>com.janeluogroupId>
    <artifactId>ikanalyzerartifactId>
    <version>2012_u6version>
dependency>

//1.2 创建写入器配置对象 参数1 版本号, 参数2 分词器
IndexWriterConfig cOnfig= new IndexWriterConfig(Version.LATEST, new IKAnalyzer());

xml version="1.0" encoding="UTF-8"?>
DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">  
<properties>  
    <comment>IK Analyzer 扩展配置comment>
    
    <entry key="ext_dict">ext.dic;entry> 
    
    
    <entry key="ext_stopwords">stopword.dic;entry> 
    
properties>

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//参数值: APPEND CREATE   CREATE_OR_APPEND
/**
 * APPEND: 表示追加, 如果索引库存在, 就会向索引库中追加数据, 如果索引库不存在, 直接报错
 * 
 * CREATE: 表示创建, 不管索引库有没有, 每一次都是重新创建一个新的索引库
 * 
 * CREATE_OR_APPEND: 如果索引库有, 就会追加, 如果没有 就会创建索引库
         默认值也是 CREATE_OR_APPEND
 */
config.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);

    /**
     * 更新索引
     * 本质先删除再添加
     * 先删除所有满足条件的文档，再创建文档
     * 因此，更新索引通常要根据唯一字段
     */
    @Test
    public void testUpdate() throws Exception {

        // 创建更改后的文档对象
        Document document = new Document();
        document.add(new StringField("id", "3", Field.Store.YES));
        document.add(new TextField("title", "更改后的titlek", Field.Store.YES));

        // 索引库对象
        Directory directory = FSDirectory.open(new File("H:\\test"));
        // 索引写入器配置对象
        IndexWriterConfig cOnf= new IndexWriterConfig(Version.LATEST, new IKAnalyzer());
        // 索引写入器对象
        IndexWriter indexWriter = new IndexWriter(directory, conf);

        // 执行更新操作 参数1 要更改的对象, 参数2 更改后的对象
        indexWriter.updateDocument(new Term("id", "1"), document);
        // 提交
        indexWriter.commit();
        // 关闭
        indexWriter.close();

    }

    // 删除索引
    @Test
    public void testDelete() throws Exception {

        // 创建目录对象
        Directory directory = FSDirectory.open(new File("H:\\test"));
        // 创建索引写入器配置对象
        IndexWriterConfig cOnf= new IndexWriterConfig(Version.LATEST, new IKAnalyzer());
        // 创建索引写入器对象
        IndexWriter indexWriter = new IndexWriter(directory, conf);

        // 执行删除操作(根据词条)，要求id字段必须是字符串类型
        indexWriter.deleteDocuments(new Term("id", "5"));
        // 根据查询条件删除
        // indexWriter.deleteDocuments(NumericRangeQuery.newLongRange("id", 2l, 4l, true, false));
        // 删除所有
        //indexWriter.deleteAll();

        // 提交
        indexWriter.commit();
        // 关闭
        indexWriter.close();
    }