Lucene 是apache软件基金会一个开放源代码的全文检索引擎工具包,是一个全文检索引擎的架构,提供了完整的查询引擎和索引引擎,部分文本分析引擎。 Lucene的目的是为软件开发人员提供一个简单易用的工具包,以方便的在目标系统中实现全文检索的功能,或者是以此为基础建立起完整的全文检索引擎。
下载地址:
http://www.apache.org/dyn/closer.cgi/lucene/java/4.10.1
1.建立lucene索引模块示例
package luceneL; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Date; import java.util.List; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.document.Field; import org.apache.lucene.document.StringField; import org.apache.lucene.document.TextField; import org.apache.lucene.index.CorruptIndexException; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.util.Version; public class Index { public static void main(String[] args) throws Exception { // String str1 = "e:/luc2"; String str2 = "e:/q"; // String str1 = args[0]; // String str2 = args[1]; Index in = new Index(); in.index(str1, str2); } public void index(String str1, String str2) throws Exception{ IndexWriter writer = null; try { // (1)创建Directory new RAMDirectory();建立在内存中 // Directory directory = new RAMDirectory(); Directory directory = FSDirectory.open(new File(str1)); // (2)创建IndexWriter,通过它来写索引 IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_4_9, new StandardAnalyzer(Version.LUCENE_4_9)); iwc.setUseCompoundFile(false); writer = new IndexWriter(directory, iwc); // (3)创建Document对象,大小,路径、内容等信息作为Field存在在Document里面 Document document = null; // (4)为Document文档添加Field List<String> list = new ArrayList<String>(); File f = new File(str2); long startTime=new Date().getTime(); for(File file : f.listFiles()){ System.out.println("开始建立索引,请稍等"); // 先存储路径、名字、内容 list=getContent(file); System.out.println("文件有"+list.size()+"条数据"); for(int i=0;i<list.size();i++){ String[] con=list.get(i).split(" 01"); document = new Document(); //System.out.println(co1.get(i)); for(int j=0;j<con.length;j++){ document.add(new TextField("c"+j, con[j],Field.Store.YES)); } // Field.Store.YES是否把这个文件的全名存储到硬盘中 // Field.Index.NOT_ANALYZED没有必要分词 document.add(new StringField("file_name", file.getName(), Field.Store.YES)); document.add(new StringField("path", file.getAbsolutePath(), Field.Store.YES)); // (5)通过IndexWriter添加文档到索引中 writer.addDocument(document); con =null; } list.clear(); } long endTime=new Date().getTime(); System.out.println("共花了"+(endTime-startTime)+"毫秒将文档增加到索引中"+str1); } catch (IOException e) { e.printStackTrace(); }finally{ if(writer!=null){ try { writer.close(); } catch (CorruptIndexException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 获取文本内容 */ public List<String> getContent(File file) throws Exception{ BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(file),"UTF-8")); //StringBuffer sb=new StringBuffer(); String line=br.readLine(); List<String> contents = new ArrayList<String>(); while(line!=null){ //sb.append(line); contents.add(line); //sb=null; line=br.readLine(); } br.close(); //return sb.toString(); return contents; } }
2 检索模块示例
import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.Date; import java.util.List; //import org.apache.lucene.analysis.core.WhitespaceAnalyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.index.IndexReader; import org.apache.lucene.queryparser.classic.ParseException; 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.apache.lucene.queryparser.classic.QueryParser; public class Search { public static void main(String[] args) throws Exception { String str1 = "e:\luc2"; String str2 = "mokdis旗舰店"; String str3 = "c2"; int in4 = 10; // String str1 = args[0]; // String str2 = args[1]; // String str3 = args[2]; // int in4 = Integer.parseInt(args[3]);//检索出多少条数据 Search hl = new Search(); hl.search(str1, str2, str3, in4); } @SuppressWarnings("deprecation") public void search(String str1, String str2, String str3, int in4) { Directory directory = null; IndexReader reader = null; long startTime = new Date().getTime(); try { directory = FSDirectory.open(new File(str1));// (1)创建Directory,要去什么地方搜索 reader = IndexReader.open(directory); // (2)创建IndexReader,通过它来读取索引 IndexSearcher searcher = new IndexSearcher(reader);// (3)根据IndexReader来创建IndexSearcher // (4)创建搜索的Query,创建parser来确定要搜索文件的内容,创建搜索的域,创建索引时设置的值 QueryParser parser = new QueryParser(Version.LUCENE_4_9, str3, new StandardAnalyzer(Version.LUCENE_4_9)); // QueryParser parser = new QueryParser(Version.LUCENE_4_9, str3, // new WhitespaceAnalyzer(Version.LUCENE_4_9)); Query query; try { query = parser.parse(str2); TopDocs tds = searcher.search(query, in4); // (5)根据Searcher搜索并返回TopDocs System.out.println("共为您查找到" + tds.totalHits + "条结果"); ScoreDoc[] sds = tds.scoreDocs; // (6)根据TopDocs获取ScoreDoc对象//这是获取一个属性 long midTime = new Date().getTime(); System.out.println("访问索引时间Tindex-1 = " + (midTime - startTime) + "毫秒"); int[] docCount = new int[in4]; int i = 0; for (ScoreDoc sd : sds) { docCount[i] = sd.doc; i++; System.out.println("sd.doc " + sd.doc);// (7)根据Searcher和ScoreDoc对象获取具体的Document对象 Document document = searcher.doc(sd.doc); // -Xmx // (8)根据Document对象获取需要的值 // System.out.println(document.get("c0")); System.out.println(document.get(str3)); // System.out.println(document.get("file_name") + "][ " // + document.get("path")); document = null; } long endTime = new Date().getTime(); System.out.println("访问Lucene数据时间Tlocal = " + (endTime - midTime) + "毫秒"); System.out.println("总检索时间TLucene = " + (endTime - startTime) + "毫秒"); // DocId序列至少涵盖顺序、逆序、随机等情况 List<Integer> list = new ArrayList<Integer>(); for (int j = 0; j < docCount.length; j++) { list.add(docCount[j]); } List<Integer> list1 = new ArrayList<Integer>();// 存原序列 List<Integer> list2 = new ArrayList<Integer>();// 存顺序排列 List<Integer> list3 = new ArrayList<Integer>();// 存倒序排列 list1 = list;// 原序列 System.out.println("原序列为:" + list1); Collections.sort(list); // 顺序排列 list2 = list;// list2存顺序序列 System.out.println("顺序序列为:" + list2); Collections.reverse(list); // 倒序排列 list3 = list;// list3存倒序排列 System.out.println("倒序序列为:" + list3); Collections.shuffle(list); // 随机排列 System.out.println("随机序列为:" + list);// list存随机序列 } catch (ParseException e) { e.printStackTrace(); } } catch (IOException e) { e.printStackTrace(); } finally { // (9)关闭Reader if (reader != null) { try { reader.close(); } catch (IOException e) { e.printStackTrace(); } } } } }