A simple standard test of Lucene (the Lucene package is based on version 3.5), javase3.5

A simple standard test of Lucene (the Lucene package is based on version 3.5), javase3.5

Lucene programming is generally divided into: Index, word segmentation, search

Index source code:

A standard test of package lucene; import java. io. bufferedReader; import java. io. file; import java. io. fileInputStream; import java. io. IOException; import java. io. inputStreamReader; import java. util. date; import org. apache. lucene. analysis. analyzer; import org. apache. lucene. analysis. standard. standardAnalyzer; import org.apache.e.doc ument. document; import org.apache.e.doc ument. field; import org. apache. lucene. index. IndexWriter; import org. apache. lucene. index. indexWriterConfig; import org. apache. lucene. index. indexWriterConfig. openMode; import org. apache. lucene. store. directory; import org. apache. lucene. store. FSDirectory; import org. apache. lucene. util. version; public class TextFileIndexer {public static void main (String [] args) throws Exception {// the location of the source File to be indexed File fileDir = new File ("E: \ Lucene \ source "); // file location for storing Indexes File indexDir = new File ("E: \ Lucene \ index"); // create the index in the hard disk Directory dir = FSDirectory. open (indexDir); // create a standard Analyzer luceneAnalyzer = new StandardAnalyzer (Version. required e_35); // IndexWriterConfig iwc = new IndexWriterConfig (Version. LUCENE_35, luceneAnalyzer); // each execution creates a new index instead of an additional index. setOpenMode (OpenMode. CREATE); // CREATE an IndexWriter indexWriter = new IndexWriter (dir, iwc); // save multiple files in the source File to the array File [] File [] textFiles = fileDir. listFiles (); // index start time long startTime = new Date (). getTime (); // for Loop the objects in the source directory for (int I = 0; I <textFiles. length; I ++) {if (textFiles [I]. isFile () & textFiles [I]. getName (). endsWith (". txt ") {// obtain the relative path ??? System. out. println ("file" + textFiles [I]. getCanonicalPath () + "being indexed... "); // call the custom method to read the file content FileReaderAll () String temp = FileReaderAll (textFiles [I]. getCanonicalPath (), "GBK"); // print the read content System. out. println (temp); // creates a document Object Document document = new Document () for the index information of each file; // file path index: only stores indexes without path creation, because we do not need to query the path Field fieldPath = new Field ("path", textFiles [I]. getPath (), Field. store. YES, Field. index. NO );// File Content Index: Field fieldBody = new Field ("body", temp, Field. store. YES, Field. index. ANALYZED, Field. termVector. WITH_POSITIONS_OFFSETS); // Add each domain to the document Object of the document. add (fieldPath); document. add (fieldBody); // write the document to the index indexWriter. addDocument (document) ;}// disable indexWriter. close (); // test the index time long endTime = new Date (). getTime (); // For the differences between getPath, getAbsolutePath, and getCanonicalPath, refer to the reprinted article System. out. println ("time used:" + (endTi Me-startTime) + "add the document to the index in milliseconds," + fileDir. getPath (); System. out. println ("time used:" + (endTime-startTime) + "millisecond to add the document to the index," + fileDir. getAbsolutePath (); System. out. println ("time used:" + (endTime-startTime) + "millisecond to add the document to the index," + fileDir. getCanonicalPath ();} // custom method for reading file content FileReaderAll () public static String FileReaderAll (String FileName, String charset) throws IOException {BufferedReader reader = new Buffe RedReader (new InputStreamReader (new FileInputStream (FileName), charset); // specify the file reading method charset: GBKString line = new String (); String temp = new String (); while (line = reader. readLine ())! = Null) {temp + = line;} reader. close (); return temp ;}}

Search source code:

A standard test of package lucene; 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. index. indexReader; import org. apache. lucene. queryParser. parseException; import org. apache. lucene. queryParser. queryParser; import org. apache. lucene. search. indexSearcher; import org. apache. lucene. search. query; I Mport org. apache. lucene. search. scoreDoc; import org. apache. lucene. search. topDocs; import org. apache. lucene. store. FSDirectory; import org. apache. lucene. util. version; public class TestQuery {public static void main (String [] args) throws IOException, ParseException {// search index path String index = "E: \ index "; indexReader reader = IndexReader. open (FSDirectory. open (new File (index); // defines the searcherIndexSearch to be queried in the index Library Er searcher = new IndexSearcher (reader); ScoreDoc [] hits = null; // query String queryString = ""; // declare the Query object query = null; // Analyzer analyzer = new StandardAnalyzer (Version. required e_35); try {QueryParser qp = new QueryParser (Version. required e_35, "body", analyzer); query = qp. parse (queryString);} catch (ParseException e) {e. printStackTrace ();} if (searcher! = Null) {TopDocs results = searcher. search (query, 10); hits = results. scoreDocs; if (hits. length> 0) {System. out. println ("find hits. length = "+ hits. length + "Result \ n" + "find results. totalHits = "+ results. totalHits);} searcher. close ();}}}