Lucence 4.0的入门示例

几年前学了2.2版本的，一直没有机会有使用到Lucense。给忘了差不多了，只留下一些简单印象。现在重新学习！

 

自己的测试用例：

 

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.LongField;
import org.apache.lucene.document.StoredField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.SimpleFSDirectory;
import org.apache.lucene.util.Version;
import org.junit.Test;

public class HelloWorld {

	private static String filePath = "D:\\workspace-java\\lucence\\data_sources\\20121212.txt";

	private static String indexDir = "D:\\workspace-java\\lucence\\index_dir";

	private static StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_40);

	@Test
	public void createIndex() {
		File f = new File(filePath);
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		StringField name = new StringField("name", f.getName(), Store.YES);
		TextField content = new TextField("content", File2DocumentUtils.readFileContent(filePath), Store.YES);
		StringField path = new StringField("path", f.getAbsolutePath(), Store.YES);
		// StringField date = new StringField("date",df.format(new Date()),Store.YES);
		// 表示只存储，不进行索引
		StoredField date = new StoredField("date", df.format(new Date()));
		LongField size = new LongField("size", f.length(), Store.YES);
		Document doc = new Document();
		doc.add(name);
		doc.add(content);
		doc.add(path);
		doc.add(date);
		doc.add(size);
		Directory directory = null;
		try {
			directory = new SimpleFSDirectory(new File(indexDir));
			IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_40, analyzer);
			config.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);
			IndexWriter indexWriter = new IndexWriter(directory, config);
			indexWriter.addDocument(doc);
			indexWriter.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	@Test
	public void searchText() {
		// MultiPhraseQuery q = new MultiPhraseQuery();
		// q.add(new Term("bride"));
		//term表示查询条件。第一参数为将要查询的字段；第二参数为要查询的语句
		TermQuery q = new TermQuery(new Term("content", "dresses"));
		Directory directory = null;
		IndexReader indexReader = null;
		try {
			directory = new SimpleFSDirectory(new File(indexDir));
			indexReader = DirectoryReader.open(directory);

			IndexSearcher indexSearcher = new IndexSearcher(indexReader);
			Filter filter = null;
			TopDocs results = indexSearcher.search(q, filter, 100);
			System.out.println("Total hits:" + results.totalHits);
			ScoreDoc[] hits = results.scoreDocs;

			for (ScoreDoc hit : hits) {
				Document d = indexSearcher.doc(hit.doc);
				System.out.println(d.getField("name").stringValue() + ",score:" + hit.score);
			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (indexReader != null) {
				try {
					indexReader.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

	}
}

 

 

 

从其他网看到的示例：

http://www.cnblogs.com/sunxucool/archive/2012/12/03/2799805.html

 

import java.io.File;
import java.io.IOException;
import java.io.StringReader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryparser.classic.MultiFieldQueryParser;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.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.search.TopScoreDocCollector;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.InvalidTokenOffsetsException;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
import org.wltea.analyzer.lucene.IKAnalyzer;

public class IndexTools {
	/**
	 * 获得indexwriter对象
	 * 
	 * @param dir
	 * @return
	 * @throws IOException
	 * @throws Exception
	 */
	private IndexWriter getIndexWriter(Directory dir, Analyzer analyzer) throws IOException {
		IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_40, analyzer);
		return new IndexWriter(dir, iwc);
	}

	/**
	 * 关闭indexwriter对象
	 * 
	 * @throws IOException
	 * 
	 * @throws Exception
	 */
	private void closeWriter(IndexWriter indexWriter) throws IOException {
		if (indexWriter != null) {
			indexWriter.close();
		}
	}

	/**
	 * 创建索引
	 * 
	 * @throws InvalidTokenOffsetsException
	 */
	public void createIndex() throws InvalidTokenOffsetsException {
		String indexPath = "D://luceneindex"; // 建立索引文件的目录
		// 默认IKAnalyzer()-false:实现最细粒度切分算法,true:分词器采用智能切分
		Analyzer analyzer = new IKAnalyzer(true);
		IndexWriter indexWriter = null;
		Directory directory = null;
		try {
			directory = FSDirectory.open(new File(indexPath));
			indexWriter = getIndexWriter(directory, analyzer);
		} catch (Exception e) {
			System.out.println("索引打开异常！");
		}
		// 添加索引
		try {
			Document document = new Document();
			document.add(new TextField("filename", "标题:起点", Store.YES));
			document.add(new TextField("content", "内容：我是一名程序员", Store.YES));
			indexWriter.addDocument(document);
			Document document1 = new Document();
			document1.add(new TextField("filename", "标题:终点", Store.YES));
			document1.add(new TextField("content", "内容：我不再只是程序员", Store.YES));
			indexWriter.addDocument(document1);
			indexWriter.commit();
		} catch (IOException e1) {
			System.out.println("索引创建异常！");
		}
		try {
			closeWriter(indexWriter);
		} catch (Exception e) {
			System.out.println("索引关闭异常！");
		}
	}

	/**
	 * 搜索
	 * 
	 * @throws ParseException
	 * @throws IOException
	 * @throws InvalidTokenOffsetsException
	 */
	@SuppressWarnings("deprecation")
	public void searchIndex() throws ParseException, IOException, InvalidTokenOffsetsException {
		String indexPath = "D://luceneindex"; // 建立索引文件的目录
		// 默认IKAnalyzer()-false:实现最细粒度切分算法,true:分词器采用智能切分
		Analyzer analyzer = new IKAnalyzer(true);
		Directory directory = null;
		try {
			directory = FSDirectory.open(new File(indexPath));
		} catch (Exception e) {
			System.out.println("索引打开异常！");
		}
		IndexReader ireader = null;
		IndexSearcher isearcher = null;
		try {
			ireader = IndexReader.open(directory);
		} catch (IOException e) {
			System.out.println("打开索引文件！");
		}
		isearcher = new IndexSearcher(ireader);
		String keyword = "程序员";
		// 使用QueryParser查询分析器构造Query对象
		// eg:单个字段查询
		// String fieldName = "content";
		// QueryParser qp = new QueryParser(Version.LUCENE_40, fieldName, analyzer);
		String[] fields = { "filename", "content" };
		QueryParser qp = new MultiFieldQueryParser(Version.LUCENE_40, fields, analyzer);
		qp.setDefaultOperator(QueryParser.AND_OPERATOR);
		Query query = qp.parse(keyword);
		// 搜索相似度最高的5条记录
		TopDocs topDocs = isearcher.search(query, 25);
		System.out.println("命中：" + topDocs.totalHits);
		// 输出结果
		ScoreDoc[] scoreDocs = topDocs.scoreDocs;
		for (int i = 0; i < topDocs.totalHits; i++) {
			Document targetDoc = isearcher.doc(scoreDocs[i].doc);
			System.out.println("内容：" + targetDoc.toString());
		}
		// 分页，高亮显示
		higherIndex(analyzer, isearcher, query, topDocs);
	}

	public static void main(String[] args) {
		IndexTools tool = new IndexTools();
		try {
			tool.searchIndex();
		} catch (ParseException e) {
			System.out.println("解析错误");
		} catch (IOException e) {
			System.out.println("读取文件流错误");
		} catch (InvalidTokenOffsetsException e) {
			System.out.println("查询失败");
		}
	}

	/**
	 * 分页，高亮显示
	 * 
	 * @param analyzer
	 * @param isearcher
	 * @param query
	 * @param topDocs
	 * @throws IOException
	 * @throws InvalidTokenOffsetsException
	 */
	public void higherIndex(Analyzer analyzer, IndexSearcher isearcher, Query query, TopDocs topDocs) throws IOException, InvalidTokenOffsetsException {
		TopScoreDocCollector results = TopScoreDocCollector.create(topDocs.totalHits, false);
		isearcher.search(query, results);
		// 分页取出指定的doc(开始条数, 取几条)
		ScoreDoc[] docs = results.topDocs(1, 2).scoreDocs;
		for (int i = 0; i < docs.length; i++) {
			Document targetDoc = isearcher.doc(docs[i].doc);
			System.out.println("内容：" + targetDoc.toString());
		}
		// 关键字高亮显示的html标签，需要导入lucene-highlighter-3.5.0.jar
		SimpleHTMLFormatter simpleHTMLFormatter = new SimpleHTMLFormatter("<font color='red'>", "</font>");
		Highlighter highlighter = new Highlighter(simpleHTMLFormatter, new QueryScorer(query));
		for (int i = 0; i < docs.length; i++) {
			Document doc = isearcher.doc(docs[i].doc);
			// 标题增加高亮显示
			TokenStream tokenStream1 = analyzer.tokenStream("filename", new StringReader(doc.get("filename")));
			String title = highlighter.getBestFragment(tokenStream1, doc.get("filename"));
			// 内容增加高亮显示
			TokenStream tokenStream2 = analyzer.tokenStream("content", new StringReader(doc.get("content")));
			String content = highlighter.getBestFragment(tokenStream2, doc.get("content"));
			System.out.println(doc.get("filename") + " : " + title + " : " + content);
		}
	}
}

 

 

 

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