Lucene_demo01_FirstProject

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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());
}
}
}

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