Lucene Homework

1
Lucene Homework

• Search,
• Corpora Characteristics,
• Lucene Introduction

2
Lucene Intro

• Lucene is an open source library that allows
  indexing and search applications to be built
• It is not a standalone application
• The Lucene demos provide starting points

3
Lucene CLASSPATH variable

• If you installed lucene _at_ c\, your CLASSPATH
  variable is
• . C\lucene-2.4.0\lucene-core-2.4.0.jarC\lucen
  e-2.4.0\lucene-demos-2.4.0.jar

watch the s
watch the periods hyphens
4
Lucene IndexFiles Demo

• Changes I made to IndexFiles.java --
• //package org.apache.lucene.demo lt- COMMENT
  THIS OUT
• import org.apache.lucene.analysis.standard.Standar
  dAnalyzer
• import org.apache.lucene.index.IndexWriter
• import org.apache.lucene.demo.FileDocument lt-
  ADD THIS
• import java.io.File
• import java.io.FileNotFoundException
• import java.io.IOException
• import java.util.Date

5
Changing invoked analyzer
Put different analyzers here

• Date start new Date()
• try
• IndexWriter writer new IndexWriter(INDEX_D
  IR, new StandardAnalyzer(), true,
  IndexWriter.MaxFieldLength.LIMITED)
• System.out.println("Indexing to directory
  '" INDEX_DIR "'...")
• indexDocs(writer, docDir)
• System.out.println("Optimizing...")
• writer.optimize()
• 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())
• ()