lucene 7.2版本（之前用的4.0 的。。发现好多都变了。。）—

本文介绍了一个使用Java实现的Lucene示例程序，该程序通过标准分析器创建了一个内存目录RAMDirectory，并向其中添加了四个包含书籍名称的文档。通过IndexWriter进行文档的写入并关闭索引。

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package com.shang.lucene.index.create;

import com.shang.lucene.index.abstracts.IndexAbstract;
import com.shang.lucene.jdbc.DataBase;
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.FieldType;
import org.apache.lucene.index.*;
import org.apache.lucene.store.RAMDirectory;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class CreateRAMIndex extends IndexAbstract {

    RAMDirectory dir = new RAMDirectory();

    public static IndexReader indexReader;
    private Connection conn;
    public void createIndex() {
        try {
            System.out.println("========试试水=====");
            Analyzer analyzer = new StandardAnalyzer(); //分词器（有简体中文分词器）
            IndexWriter indexWriter = new IndexWriter(dir, new IndexWriterConfig(analyzer));
            Document doc = new Document();
            Document doc1 = new Document();
            Document doc2 = new Document();
            Document doc3 = new Document();
            FieldType fieldType = new FieldType();
            fieldType.setStored(true); // 设置为true，存储此字段
            doc.add(new Field("bookName", "白夜行", fieldType));
            doc1.add(new Field("bookName", "时间移民", fieldType));
            doc2.add(new Field("bookName", "假面饭店", fieldType));
            doc3.add(new Field("bookName", "废都", fieldType));
            indexWriter.addDocument(doc);
            indexWriter.addDocument(doc1);
            indexWriter.addDocument(doc2);
            indexWriter.addDocument(doc3);
            indexWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        CreateRAMIndex s = new CreateRAMIndex();
        s.createIndex();
    }
}