Lucene_demo01_FirstProject

Java代码

/**

* 创建一个索引库，把一个信息加入到索引库中、把信息从索引库中检索出来

*/

public class HelloLuceneWorld {

/**

* 创建索引

*/

@Test

public void createIndex() throws Exception {

// 1创建article对象

Article article = new Article();

article.setId(1L);

article.setTitle("NBA总决赛");

article.setContent("LBJ和韦德能带领热火在2013赛季拿到NBA总冠军吗？");

// 创建索引库,创建IndexWriter对象

Directory directory = FSDirectory.open(new File("./indexDir"));

Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);

IndexWriter indexWriter = new IndexWriter(directory, analyzer, MaxFieldLength.LIMITED);

// 把article对象转化成document、把article对象加入到索引库中

Document document = new Document();

Field idField = new Field("id", article.getId().toString(), Store.YES, Index.NOT_ANALYZED);

Field titleField = new Field("title", article.getTitle(), Store.YES, Index.ANALYZED);

Field contentField = new Field("content", article.getContent(), Store.YES, Index.ANALYZED);

document.add(idField);

document.add(titleField);

document.add(contentField);

indexWriter.addDocument(document);// 信息放入到索引库

indexWriter.close();// 关闭indexWriter

}

/**

* 进行检索

*/

@Test

public void searchIndex() throws Exception {

// 创建IndexSearch对象

Directory directory = FSDirectory.open(new File("./indexDir"));

IndexSearcher indexSearcher = new IndexSearcher(directory);

Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);

QueryParser queryParser = new QueryParser(Version.LUCENE_30, "title", analyzer);

Query query = queryParser.parse("总决赛");// 关键词

TopDocs topDocs = indexSearcher.search(query, 5);// 第二个参数为n，提取前n条记录

int count = topDocs.totalHits;// 根据关键词检索出来的总的记录数

ScoreDoc[] scoreDocs = topDocs.scoreDocs;

List<Article> articleList = new ArrayList<Article>();

for (int i = 0; i < scoreDocs.length; i++) {

int index = scoreDocs[i].doc;

Document document = indexSearcher.doc(index);

Article article = new Article();

article.setId(Long.parseLong(document.get("id")));

article.setTitle(document.get("title"));

article.setContent(document.get("content"));

articleList.add(article);

}

// 输出查询到的信息

for (Article article : articleList) {

System.out.println(article.getId());

System.out.println(article.getTitle());

System.out.println(article.getContent());

}

}

}