Lucene 6.5.0 入门Demo

Lucene 6.5.0 要求jdk 1.8

1.目录结构;

2.数据库环境;

private int id;
private String name;
private float price;
private String pic;
private String description

3.

LuceneApache的一个全文检索引擎工具包,它不能独立运行不能单独对外提供服务

 

 

/**
 * Created by  on 2017/4/25.
 */
public class IndexManager {
    @Test
    public void createIndex() throws Exception {
        // 采集数据
        BookDao dao = new BookDaoImpl();
        List<Book> list = dao.queryBooks();

        // 将采集到的数据封装到Document对象中
        List<Document> docList = new ArrayList<Document>();
        Document document;
        for (Book book : list) {
            document = new Document();
            // store:如果是yes,则说明存储到文档域中
            // 图书ID
            // Field id = new TextField("id", book.getId().toString(), Store.YES);

            Field id = new TextField("id", Integer.toString(book.getId()), Field.Store.YES);
            // 图书名称
            Field name = new TextField("name", book.getName(), Field.Store.YES);
            // 图书价格
            Field price = new TextField("price", Float.toString(book.getPrice()), Field.Store.YES);
            // 图书图片地址
            Field pic = new TextField("pic", book.getPic(), Field.Store.YES);
            // 图书描述
            Field description = new TextField("description", book.getDescription(), Field.Store.YES);

            // 将field域设置到Document对象中
            document.add(id);
            document.add(name);
            document.add(price);
            document.add(pic);
            document.add(description);

            docList.add(document);
        }
        //JDK 1.7以后 open只能接收Path/////////////////////////////////////////////////////

        // 创建分词器,标准分词器
        Analyzer analyzer = new StandardAnalyzer();

        // 创建IndexWriter
        // IndexWriterConfig cfg = new IndexWriterConfig(Version.LUCENE_6_5_0,analyzer);
        IndexWriterConfig cfg = new IndexWriterConfig(analyzer);

        // 指定索引库的地址
//         File indexFile = new File("D:\\L\a\Eclipse\\lecencedemo\\");
//         Directory directory = FSDirectory.open(indexFile);
        Directory directory = FSDirectory.open(FileSystems.getDefault().getPath("D:\\Lpj\\JetBrains\\lucenceIndex1\\"));

        IndexWriter writer = new IndexWriter(directory, cfg);
      writer.deleteAll(); //清除以前的index
        // 通过IndexWriter对象将Document写入到索引库中
        for (Document doc : docList) {
            writer.addDocument(doc);
        }

        // 关闭writer
        writer.close();
    }

}

  

 

/**
 * Created by  on 2017/4/25.
 */
public class IndexSearch {
    private void doSearch(Query query) {
        // 创建IndexSearcher
        // 指定索引库的地址
        try {
//			File indexFile = new File("D:\\Lpj\\Eclipse\\lecencedemo\\");
//			Directory directory = FSDirectory.open(indexFile);
            // 1、创建Directory
            //JDK 1.7以后 open只能接收Path
            Directory directory = FSDirectory.open(FileSystems.getDefault().getPath("D:\\Lpj\\JetBrains\\lucenceIndex1\\"));
            IndexReader reader = DirectoryReader.open(directory);
            IndexSearcher searcher = new IndexSearcher(reader);
            // 通过searcher来搜索索引库
            // 第二个参数:指定需要显示的顶部记录的N条
            TopDocs topDocs = searcher.search(query, 10);

            // 根据查询条件匹配出的记录总数
            int count = topDocs.totalHits;
            System.out.println("匹配出的记录总数:" + count);
            // 根据查询条件匹配出的记录
            ScoreDoc[] scoreDocs = topDocs.scoreDocs;

            for (ScoreDoc scoreDoc : scoreDocs) {
                // 获取文档的ID
                int docId = scoreDoc.doc;

                // 通过ID获取文档
                Document doc = searcher.doc(docId);
                System.out.println("商品ID:" + doc.get("id"));
                System.out.println("商品名称:" + doc.get("name"));
                System.out.println("商品价格:" + doc.get("price"));
                System.out.println("商品图片地址:" + doc.get("pic"));
                System.out.println("==========================");
                // System.out.println("商品描述:" + doc.get("description"));
            }
            // 关闭资源
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Test
    public void indexSearch() throws Exception {
        // 创建query对象
        Analyzer analyzer = new StandardAnalyzer();
        // 使用QueryParser搜索时,需要指定分词器,搜索时的分词器要和索引时的分词器一致
        // 第一个参数:默认搜索的域的名称
        QueryParser parser = new QueryParser("description", analyzer);

        // 通过queryparser来创建query对象
        // 参数:输入的lucene的查询语句(关键字一定要大写)
        Query query = parser.parse("description:java AND lucene");

        doSearch(query);

    }

  

posted @ 2017-04-25 16:02  个子  阅读(3947)  评论(0编辑  收藏  举报