Java tutorial
package sisTradicional; /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.es.SpanishAnalyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.document.DoubleField; import org.apache.lucene.document.Field; import org.apache.lucene.document.LongField; import org.apache.lucene.document.StringField; import org.apache.lucene.document.TextField; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig.OpenMode; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.index.Term; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.util.Version; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; import crawler.ParserDump; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.net.URI; import java.nio.file.Paths; import java.util.Date; import javax.lang.model.element.Element; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.ParserConfigurationException; /** Index all text files under a directory. * <p> * This is a command-line application demonstrating simple Lucene indexing. * Run it with no command-line arguments for usage information. */ public class IndexFiles { private IndexFiles() { } /** Index all text files under a directory. */ public static void main(String[] args) { String usage = "java org.apache.lucene.demo.IndexFiles" + " [-index INDEX_PATH] [-docs DOCS_PATH] \n\n" + "This indexes the documents in DOCS_PATH, creating a Lucene index" + "in INDEX_PATH that can be searched with SearchFiles"; String indexPath = "index"; String docsPath = "Datos/recordsdc"; //String dump = "Datos/dump"; boolean temporal = false; for (int i = 0; i < args.length; i++) { if ("-index".equals(args[i])) { indexPath = args[i + 1]; i++; } else if ("-dump".equals(args[i])) { //dump = args[i+1]; i++; } } //ParserDump.start(dump); final File docDir = new File(docsPath); if (!docDir.exists() || !docDir.canRead()) { System.out.println("Document directory '" + docDir.getAbsolutePath() + "' does not exist or is not readable, please check the path"); System.exit(1); } Date start = new Date(); try { System.out.println("Indexing to directory '" + indexPath + "'..."); Directory dir = FSDirectory.open((new File(indexPath)).toPath()); Analyzer analyzer = new SpanishAnalyzer(); IndexWriterConfig iwc = new IndexWriterConfig(analyzer); iwc.setOpenMode(OpenMode.CREATE); IndexWriter writer = new IndexWriter(dir, iwc); indexDocs(writer, docDir, temporal); writer.close(); Date end = new Date(); System.out.println(end.getTime() - start.getTime() + " total milliseconds"); } catch (IOException e) { System.out.println(" caught a " + e.getClass() + "\n with message: " + e.getMessage()); } } /** * Indexes the given file using the given writer, or if a directory is given, * recurses over files and directories found under the given directory. * * NOTE: This method indexes one document per input file. This is slow. For good * throughput, put multiple documents into your input file(s). An example of this is * in the benchmark module, which can create "line doc" files, one document per line, * using the * <a href="../../../../../contrib-benchmark/org/apache/lucene/benchmark/byTask/tasks/WriteLineDocTask.html" * >WriteLineDocTask</a>. * * @param writer Writer to the index where the given file/dir info will be stored * @param file The file to index, or the directory to recurse into to find files to index * @throws IOException If there is a low-level I/O error */ static void indexDocs(IndexWriter writer, File file, boolean temporal) throws IOException { // do not try to index files that cannot be read if (file.canRead()) { if (file.isDirectory()) { String[] files = file.list(); // an IO error could occur if (files != null) { for (int i = 0; i < files.length; i++) { indexDocs(writer, new File(file, files[i]), temporal); } } } else { FileInputStream fis; try { fis = new FileInputStream(file); } catch (FileNotFoundException fnfe) { // at least on windows, some temporary files raise this exception with an "access denied" message // checking if the file can be read doesn't help return; } try { // make a new, empty document Document doc = new Document(); // Add the path of the file as a field named "path". Use a // field that is indexed (i.e. searchable), but don't tokenize // the field into separate words and don't index term frequency // or positional information: Field pathField = new StringField("path", file.getName(), Field.Store.YES); doc.add(pathField); //TODO: add url // Add the last modified date of the file a field named "modified". // Use a LongField that is indexed (i.e. efficiently filterable with // NumericRangeFilter). This indexes to milli-second resolution, which // is often too fine. You could instead create a number based on // year/month/day/hour/minutes/seconds, down the resolution you require. // For example the long value 2011021714 would mean // February 17, 2011, 2-3 PM. doc.add(new LongField("modified", file.lastModified(), Field.Store.YES)); // Add the contents of the file to a field named "contents". Specify a Reader, // so that the text of the file is tokenized and indexed, but not stored. // Note that FileReader expects the file to be in UTF-8 encoding. // If that's not the case searching for special characters will fail. //doc.add(new TextField("contents", new BufferedReader(new InputStreamReader(fis, "UTF-8")))); try { DocumentBuilderFactory DBF = DocumentBuilderFactory.newInstance(); DocumentBuilder DB = DBF.newDocumentBuilder(); org.w3c.dom.Document xmlDoc = DB.parse(file); if (xmlDoc.getElementsByTagName("dc:title").item(0) != null) { doc.add(new TextField("title", xmlDoc.getElementsByTagName("dc:title").item(0).getTextContent(), Field.Store.YES)); } NodeList creatorList = xmlDoc.getElementsByTagName("dc:creator"); if (creatorList.item(0) != null) { String creators = creatorList.item(0).getTextContent(); for (int i = 1; i < creatorList.getLength(); i++) { creators = creators + " " + creatorList.item(i).getTextContent(); } doc.add(new TextField("creator", creators, Field.Store.YES)); } if (xmlDoc.getElementsByTagName("dc:date").item(0) != null) { doc.add(new TextField("date", xmlDoc.getElementsByTagName("dc:date").item(0).getTextContent(), Field.Store.YES)); } if (xmlDoc.getElementsByTagName("dc:publisher").item(0) != null) { doc.add(new TextField("publisher", xmlDoc.getElementsByTagName("dc:publisher").item(0).getTextContent(), Field.Store.YES)); } } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } doc.add(new TextField("contents", new BufferedReader(new InputStreamReader(fis, "UTF-8")))); if (writer.getConfig().getOpenMode() == OpenMode.CREATE) { // New index, so we just add the document (no old document can be there): System.out.println("adding " + file.getName()); writer.addDocument(doc); } else { // Existing index (an old copy of this document may have been indexed) so // we use updateDocument instead to replace the old one matching the exact // path, if present: System.out.println("updating " + file); writer.updateDocument(new Term("path", file.getPath()), doc); } } finally { fis.close(); if (temporal) { file.delete(); } } } } } }