Lucene 研究 1 座

     搜索是神奇的，世界上的知识对于个人来讲是无限的，也没有必要去追求完美。然而搜索似乎可以改变人们的生活一样，深深的扎根在现代人的生活中。因为项目原因接触了这方面的知识，于是想再走近看看清楚，作为入门，lucene似乎很被推荐。

 

献给刚刚对lucene感兴趣的人们！

 

附上我对搜索的感想： 我觉得也是蛮好理解的事情，对于所有的文件，资料，用不同的解析器对他们用不同的分词器进行分词建立索引，而搜索时建立在索引的基础上的，只要有索引，搜索变得异常简单。

 

-----------1，建立索引

注意点：不同的lucene jar包是不一样的，方法会有很大的不同，我在这里用的是2.40版

 

 

遍历文件夹下的所有文件：

 

package tool;import java.io.*;public class FileList {private static final String SEP = "/";private static StringBuffer sb = new StringBuffer();//返回数组public static String[] getFiles(File f){if(f.isDirectory()){File[] fs = f.listFiles();for(int i=0;i<fs.length;i++){getFiles(fs[i]);}}else{sb.append(f.getPath()+SEP);}String s=sb.toString();String[] list =s.split(SEP);return list;}public static String[]getFile(String t)throws IOException{File f = new File(t);if(f.isDirectory()){File[] fs = f.listFiles();for (int i = 0; i < fs.length; i++) {getFiles(fs[i]);}}else{sb.append(f.getPath()+SEP);}String s = sb.toString();String[] lists = s.split(SEP);return lists;}public static void main(String[] args)throws IOException{String s[]=FileList.getFile("D:/test");for (int i = 0; i < s.length; i++) {System.out.println(s[i]);}}}

 

 

建立文件夹下所有文件的索引：

package tool;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.index.CorruptIndexException;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.store.LockObtainFailedException;public class LoopIndexer {public static void main(String[] args) throws CorruptIndexException, LockObtainFailedException, IOException{String indexPath="d:/loop";Analyzer analyzer = new StandardAnalyzer();IndexWriter writer = new IndexWriter(indexPath,analyzer,true,IndexWriter.MaxFieldLength.UNLIMITED);String[] files = FileList.getFile("d:/test");for (int i = 0; i < files.length; i++) {Document doc = new Document();File f = new File(files[i]);//创建Field -nameString name = f.getName();Field field = new Field("name",name,Field.Store.YES,Field.Index.ANALYZED);doc.add(field);//创建Field -contentString content = FileText.getText(f);field = new Field("content",content,Field.Store.YES,Field.Index.ANALYZED);doc.add(field);//创建 -PathString path = f.getPath();field = new Field("path",path,Field.Store.YES,Field.Index.ANALYZED);doc.add(field);System.out.println("Field"+name+"Indexed");//添加documentwriter.addDocument(doc);}writer.close();System.out.print("Loop Index Created");}}

利用索引进行简单的查询：

package tool;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.index.CorruptIndexException;import org.apache.lucene.index.Term;import org.apache.lucene.queryParser.ParseException;import org.apache.lucene.queryParser.QueryParser;import org.apache.lucene.search.Hits;import org.apache.lucene.search.IndexSearcher;import org.apache.lucene.search.Query;import org.apache.lucene.search.ScoreDoc;import org.apache.lucene.search.TermQuery;import org.apache.lucene.search.TopDocCollector;import org.apache.lucene.search.TopDocs;public class BasicShearcher {public static void main(String[] args) throws CorruptIndexException, IOException, ParseException {String indexPath = "d:/loop";String searchField = "name";String searchValue ="马其顿";Analyzer analyzer = new StandardAnalyzer();IndexSearcher is = new IndexSearcher(indexPath);QueryParser q = new QueryParser(searchField,analyzer);org.apache.lucene.search.Query query = q.parse(searchValue);StringBuffer sb = new StringBuffer();if(is!=null){TopDocCollector collector = new TopDocCollector(8);is.search(query,collector);TopDocs top = collector.topDocs();ScoreDoc[] docs =top.scoreDocs;System.out.println(docs.length+"----------------");for (int i=0;i<docs.length;i++) {int docId = docs[i].doc; Document document = is.doc(docId);Field field1 = document.getField("name");sb.append("name"+"/n");sb.append(field1.stringValue()+"/n");Field field2 = document.getField("content");sb.append("content:"+"/n");sb.append(field2.stringValue());sb.append("=================================="+"/n");}}is.close();System.out.println(sb);}}

 

以上就是简单搜索功能的全部代码，以实现。