Lucene官方一个简单的实例

Lucene 是一个基于 Java 的全文信息检索工具包，它不是一个完整的搜索应用程序，而是为你的应用程序提供索引和搜索功能。Lucene 目前是 Apache家族中的一个开源项目。也是目前最为流行的基于 Java 开源全文检索工具包。

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官方简单的例子：版本(lucene 4.1.0)

导入lucene-core-4.1.0.jar、lucene-analyzers-common-4.1.0.jar、lucene-queries-4.1.0.jar、lucene-queryparser-4.1.0.jar

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1.IndexWriter建立索引的类；

2.IndexSearcher搜索索引的类

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package com.mei.testlucene;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.document.Document;import org.apache.lucene.document.Field;import org.apache.lucene.document.TextField;import org.apache.lucene.index.DirectoryReader;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.index.IndexWriterConfig;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.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.store.RAMDirectory;import org.apache.lucene.util.Version;public class HelloLucene {  public static void main(String[] args) throws IOException, ParseException {Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT); // Store the index in memory:    Directory directory = new RAMDirectory();    // To store an index on disk, use this instead:    //Directory directory = FSDirectory.open(new File("H:/luceneIndex"));    IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_CURRENT, analyzer);    IndexWriter iwriter = new IndexWriter(directory, config);    Document doc = new Document();    String text = "This is the text to be indexed.";    doc.add(new Field("fieldname", text, TextField.TYPE_STORED));    iwriter.addDocument(doc);    iwriter.close();    System.out.println("建立索引 ok");        // Now search the index:    DirectoryReader ireader = DirectoryReader.open(directory);    IndexSearcher isearcher = new IndexSearcher(ireader);    // Parse a simple query that searches for "text":    QueryParser parser = new QueryParser(Version.LUCENE_CURRENT, "fieldname", analyzer);    Query query = parser.parse("text");    ScoreDoc[] hits = isearcher.search(query, null, 1000).scoreDocs;    System.out.println(hits.length == 1);    // Iterate through the results:    for (int i = 0; i < hits.length; i++) {      Document hitDoc = isearcher.doc(hits[i].doc);      System.out.println(hitDoc.get("fieldname"));    }    ireader.close();    directory.close();}}

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