lucene入门DEMO2

简单的JavaBean

package com.pdsu.lucene.simple; /** * 类说明： * * @author 作者: LiuJunGuang * @version 创建时间：2011-12-29 下午04:40:39 */ public class Article { private int id; private String title; private String content; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } public Article(int id, String title, String content) { super(); this.id = id; this.title = title; this.content = content; } public Article() { super(); } @Override public String toString() { return "Article [id=" + id + ", title=" + title + ", content=" + content + "]"; } }
文章工具类：

package com.pdsu.lucene.simple; import org.apache.lucene.document.Document; import org.apache.lucene.document.Field; import org.apache.lucene.document.Field.Index; import org.apache.lucene.document.Field.Store; /** * 类说明： Articlede * * @author 作者: LiuJunGuang * @version 创建时间：2011-12-29 下午05:44:02 */ public class ArticleUtils { public static Document article2Document(Article article) { Document document = new Document(); Field idField = new Field("id", String.valueOf(article.getId()), 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.NOT_ANALYZED); document.add(idField); document.add(titleField); document.add(contentField); return document; } public static Article document2Article(Document document) { return new Article(Integer.parseInt(document.get("id")), document.get("title"), document.get("content")); } } Lucene工具类

package com.pdsu.lucene.simple; import java.io.File; import java.io.IOException; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriter.MaxFieldLength; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.util.Version; /** * 类说明：Lucene工具类 * @author 作者: LiuJunGuang * @version 创建时间：2011-12-29 下午05:49:06 */ public class LuceneUtils { /** * 存储目录 */ private static Directory directory; /** * indexWriter */ private static IndexWriter indexWriter; /** * 分词器 */ private static Analyzer analyzer; static { try { directory = FSDirectory.open(new File("./store")); // 数据存储目录 /* * 内存索引库特点： * 访问数据的速度比较快 * 数据只是暂时的 */ //directory = RAMDirectory.open(); //内存数据存取目录 analyzer = new StandardAnalyzer(Version.LUCENE_30);// 分词器 indexWriter = new IndexWriter(directory, analyzer, MaxFieldLength.LIMITED); } catch (IOException e) { e.printStackTrace(); } } private LuceneUtils() { super(); } /** * 取得存取目录 * @return */ public static Directory getDirectory(){ return directory; } /** * 获得IndexWriter * @return */ public static IndexWriter getIndexWriter(){ return indexWriter; } /** *获得分词器 * @return */ public static Analyzer getAnalyzer(){ return analyzer; } }
Lucene简单的增删改查

package com.pdsu.lucene.simple; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.lucene.document.Document; import org.apache.lucene.index.CorruptIndexException; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.Term; import org.apache.lucene.queryParser.QueryParser; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.ScoreDoc; import org.apache.lucene.search.TopDocs; import org.apache.lucene.util.Version; import org.junit.Test; /** * 类说明： * * @author 作者: LiuJunGuang * @version 创建时间：2011-12-29 下午05:54:29 */ public class LuceneTest { @Test public void add() throws Exception { IndexWriter indexWriter = LuceneUtils.getIndexWriter(); /* * 合并的代码写在添加之前 */ indexWriter.setMergeFactor(2);//当超过两个索引时，就合并成一个 //indexWriter.optimize();//手动合并索引库 indexWriter.addDocument(ArticleUtils.article2Document(new Article(1,"hello world!","hello content!"))); indexWriter.commit(); indexWriter.close(); } @Test public void del() throws Exception { IndexWriter indexWriter = LuceneUtils.getIndexWriter(); Term term = new Term("id", "1"); indexWriter.deleteDocuments(term); indexWriter.commit(); indexWriter.close(); } @Test public void update() throws CorruptIndexException, IOException { IndexWriter indexWriter = LuceneUtils.getIndexWriter(); Term term = new Term("id", "2"); Document doc = ArticleUtils.article2Document(new Article(2,"hello world!","hello content!")); indexWriter.updateDocument(term, doc); indexWriter.commit(); indexWriter.close(); } @Test public void query() throws Exception { IndexSearcher indexSearcher = new IndexSearcher(LuceneUtils.getDirectory()); QueryParser qp = new QueryParser(Version.LUCENE_30, "title", LuceneUtils.getAnalyzer()); Query query = qp.parse("hello"); TopDocs tops = indexSearcher.search(query, 10); //获得记录总条数 int count = tops.totalHits; ScoreDoc []scoreDocs = tops.scoreDocs;//得到目录 List<Article> articles = new ArrayList<Article>(); for (int i = 0; i < scoreDocs.length; i++) { float score = scoreDocs[i].score;//相关度得分 int doc = scoreDocs[i].doc; Document document = indexSearcher.doc(doc); Article article = ArticleUtils.document2Article(document); articles.add(article); } System.out.println(articles); } }