import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.apache.lucene.analysis.Analyzer;import org.apache.lucene.analysis.standard.StandardAnalyzer;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;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.index.IndexWriter.MaxFieldLength;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.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.util.Version;import org.junit.Test;import cn.itcast._domain.Article;public class HelloWorld {	private static Directory directory; // 索引库文件夹	private static Analyzer analyzer; // 分词器	static {		try {			directory = FSDirectory.open(new File("./indexDir"));			analyzer = new StandardAnalyzer(Version.LUCENE_30);		} catch (IOException e) {			throw new RuntimeException(e);		}	}	// 建立索引	@Test	public void testCreateIndex() throws Exception {		// 准备数据		Article article = new Article();		article.setId(1);		article.setTitle("准备Lucene的开发环境");		article.setContent("假设信息检索系统在用户发出了检索请求后再去互联网上找答案，根本无法在有限的时间内返回结果。");		// 放到索引库中		// 1, 把Article转为Document		Document doc = new Document();		String idStr = article.getId().toString();		doc.add(new Field("id", idStr, Store.YES, Index.NOT_ANALYZED));		doc.add(new Field("title", article.getTitle(), Store.YES, Index.ANALYZED));		doc.add(new Field("content", article.getContent(), Store.NO, Index.ANALYZED));		// 2, 把Document放到索引库中		IndexWriter indexWriter = new IndexWriter(directory, analyzer,  MaxFieldLength.UNLIMITED);		indexWriter.addDocument(doc);		indexWriter.close();	}	// 搜索	@Test	public void testSearch() throws Exception {		// 准备查询条件		String queryString = "lucene";		// String queryString = "hibernate";		// 运行搜索		List
     
       list = new ArrayList
      
       ();		// ==========================================================================================		// 1，把查询字符串转为Query对象（默认仅仅从title中查询）		QueryParser queryParser = new QueryParser(Version.LUCENE_30, "title", analyzer);		Query query = queryParser.parse(queryString);		// 2，运行查询，得到中间结果		IndexSearcher indexSearcher = new IndexSearcher(directory); // 指定所用的索引库		TopDocs topDocs = indexSearcher.search(query, 100); // 最多返回前n条结果		int count = topDocs.totalHits;		ScoreDoc[] scoreDocs = topDocs.scoreDocs;		// 3，处理结果		for (int i = 0; i < scoreDocs.length; i++) {			ScoreDoc scoreDoc = scoreDocs[i];			float score = scoreDoc.score; // 相关度得分			int docId = scoreDoc.doc; // Document的内部编号			// 依据编号拿到Document数据			Document doc = indexSearcher.doc(docId);			// 把Document转为Article			String idStr = doc.getField("id").toString(); //doc.get("id"); 			String title = doc.get("title");			String content = doc.get("content"); // 等价于 doc.getField("content").stringValue();			Article article = new Article();			article.setId(Integer.parseInt(idStr));			article.setTitle(title);			article.setContent(content);			list.add(article);		}		indexSearcher.close();		// ==========================================================================================		// 显示结果		System.out.println("总结果数：" + list.size());		for (Article a : list) {			System.out.println("------------------------------");			System.out.println("id = " + a.getId());			System.out.println("title = " + a.getTitle());			System.out.println("content = " + a.getContent());		}	}}
      
     

public class Article {	private Integer id;	private String title;	private String content;	public Integer getId() {		return id;	}	public void setId(Integer 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;	}}