Lucene

API

Document

Document:文档对象，是一条原始数据

==一条记录就是一个document，document的每一个字段就是一个Field==

Field

创建索引

private final static File INDEX_FILE = new File("E:\\DevelopTools\\indexDir");public static void indexCreate(Document doc) throws Exception { ???// 创建目录对象，指定索引库的存放位置；FSDirectory文件系统；RAMDirectory内存 ???Directory dir = FSDirectory.open(INDEX_FILE); ???// 创建分词器对象 ???Analyzer analyzer = new IKAnalyzer(); ???// 创建索引写入器配置对象，第一个参数版本VerSion.LATEST,第二个参数分词器 ???IndexWriterConfig conf = new IndexWriterConfig(Version.LATEST, analyzer); ???// 创建索引写入器 ???IndexWriter indexWriter = new IndexWriter(dir, conf); ???// 向索引库写入文档对象 ???indexWriter.addDocument(doc); ???// 提交 ???indexWriter.commit(); ???// 关闭 ???indexWriter.close();}

@Testpublic void createTest() throws Exception { ???// ???Document doc = new Document(); ???doc.add(new LongField("id", 1, Store.YES)); ???doc.add(new TextField("title", "谷歌地图之父跳槽FaceBook", Store.YES)); ???doc.add(new TextField("context", "据国外媒体报道，曾先后负责谷歌地图和Wave开发工作的拉斯·拉斯姆森(Lars Rasmussen)已经离开谷歌，并将加盟Facebook。", Store.YES)); ???indexCreate(doc);}

查询索引

public static void indexSearcher(Query query, Integer n) throws IOException { ???// 初始化索引库对象 ???Directory dir = FSDirectory.open(INDEX_FILE); ???// 索引读取工具 ???IndexReader indexReader = DirectoryReader.open(dir); ???// 索引搜索对象 ??????????IndexSearcher indexSeracher = new IndexSearcher(indexReader); ??????// 执行搜索操作，返回值topDocs ???????TopDocs topDocs = indexSeracher.search(query, n); ???// 匹配搜索条件的总记录数 ???System.out.println("一共命中：" + topDocs.totalHits + "条数据"); ???// 获得得分文档数组对象，得分文档对象包含得分和文档编号 ???ScoreDoc[] scoreDocs = topDocs.scoreDocs; ???for (ScoreDoc scoreDoc : scoreDocs) { ???????int docID = scoreDoc.doc; ???????float score = scoreDoc.score; ???????System.out.println("文档编号：" + docID); ???????System.out.println("文档得分：" + score); ???????// 获取文档对象，通过索引读取工具 ???????Document document = indexReader.document(docID); ???????System.out.println("id:" + document.get("id")); ???????System.out.println("title:" + document.get("title")); ???????System.out.println("context:" + document.get("context")); ???} ???indexReader.close();}

@Testpublic void searchTest() throws Exception { ???//单一字段的查询解析器 ???// 创建查询解析器对象 ???QueryParser parser = new QueryParser("title", new IKAnalyzer()); ???// 创建查询对象 ???Query query = parser.parse("谷歌"); ???//根据Query搜索，返回评分最高的n条记录 ???indexSearcher(query, 10); ???????/*多字段的查询解析器 ???MultiFieldQueryParser parser = new MultiFieldQueryParser(new String[]{"id","title"}, new IKAnalyzer()); ???Query query = parser.parse("1");*/}

各种其他查询方式

//词条查询，查询条件必须是最小粒度不可再分割的内容Query query = new TermQuery(new Term("title", "谷歌"));//通配符查询, ?：匹配一个字符, *：匹配多个字符Query query = new WildcardQuery(new Term("title", "*歌*"));//模糊查询, 参数：1-词条，查询字段及关键词，关键词允许写错；2-允许写错的最大编辑距离，并且不能大于2（0~2）Query query = new FuzzyQuery(new Term("title", "facebool"), 1);//数值范围查询,查询非String类型的数据或者说是一些继承Numeric类的对象的查询,参数1-字段；2-最小值；3-最大值；4-是否包含最小值；5-是否包含最大值Query query = NumericRangeQuery.newLongRange("id", 2l, 4l, true, true);//组合查询， 交集： Occur.MUST + Occur.MUST, 并集：Occur.SHOULD + Occur.SHOULD, 非：Occur.MUST_NOTBooleanQuery query = new BooleanQuery();Query query1 = NumericRangeQuery.newLongRange("id", 2l, 4l, true, true);Query query2 = new WildcardQuery(new Term("title", "*歌*"));query.add(query1, Occur.SHOULD);query.add(query2, Occur.SHOULD);

修改索引

//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，修改索引通常要根据唯一字段public static void indexUpdate(Term term, Document doc) throws IOException { ???Directory dir = FSDirectory.open(INDEX_FILE); ???Analyzer analyzer = new IKAnalyzer(); ???IndexWriterConfig conf = new IndexWriterConfig(Version.LATEST, analyzer); ???IndexWriter indexWriter = new IndexWriter(dir, conf); ???indexWriter.updateDocument(term, doc); ???indexWriter.commit(); ???indexWriter.close(); ???}

@Testpublic void updateTest() throws Exception { ???Term term = new Term("title", "facebook"); ???Document doc = new Document(); ???doc.add(new LongField("id", 1L, Store.YES)); ???doc.add(new TextField("title", "谷歌地图之父跳槽FaceBook", Store.YES)); ???doc.add(new TextField("context", "河马程序员加盟FaceBook", Store.YES)); ???indexUpdate(term, doc);}

删除索引

// 执行删除操作(根据词条)，要求id字段必须是字符串类型public static void indexDelete(Term term) throws IOException { ???Directory dir = FSDirectory.open(INDEX_FILE); ???Analyzer analyzer = new IKAnalyzer(); ???IndexWriterConfig conf = new IndexWriterConfig(Version.LATEST, analyzer); ???IndexWriter indexWriter = new IndexWriter(dir, conf); ???indexWriter.deleteDocuments(term); ???indexWriter.commit(); ???indexWriter.close(); ???}public static void indexDeleteAll() throws IOException { ???Directory dir = FSDirectory.open(INDEX_FILE); ???Analyzer analyzer = new IKAnalyzer(); ???IndexWriterConfig conf = new IndexWriterConfig(Version.LATEST, analyzer); ???IndexWriter indexWriter = new IndexWriter(dir, conf); ???indexWriter.deleteAll(); ???indexWriter.commit(); ???indexWriter.close(); ???}

@Testpublic void deleteTest() throws Exception { ???/* ????* Term term = new Term("context", "facebook"); indexDelete(term); ????*/ ???indexDeleteAll();}

Lucene简单总结

原文地址：https://www.cnblogs.com/lifuwei/p/9179493.html