Lucene-01:建立索引

咱們在D盤下建一個文件夾叫lucene，lucene內再建兩個文件夾，一個叫example，一個叫index01。example文件夾下三個txt文件，a.txt內容爲hello java,b.txt內容爲hello lucene,c.txt內容爲hello hadoop。

package com.amazing;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;

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.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

public class HelloLucene {

    public void createIndex(){
        IndexWriter writer = null;
        try {
            Directory directory = FSDirectory.open(new File("D:"+File.separator+"lucene"+File.separator+"index01"));
            IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_35,new StandardAnalyzer(Version.LUCENE_35));
            writer = new IndexWriter(directory,iwc);
            Document doc = null;
            File f = new File("D:"+File.separator+"lucene"+File.separator+"example");
            for(File file:f.listFiles()){
                doc = new Document();
                doc.add(new Field("content",new FileReader(file)));
                doc.add(new Field("filename",file.getName(),Field.Store.YES,Field.Index.NOT_ANALYZED));
                doc.add(new Field("path",file.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));
                writer.addDocument(doc);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally{
            if(writer != null){
                try {
                    writer.close();
                } catch (CorruptIndexException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        
    }
}

運行測試類：

package com.amazing;

import org.junit.Test;

public class TestLucene {

    @Test
    public void testCreateIndex(){
        HelloLucene hl = new HelloLucene();
        hl.createIndex();
    }
}

文件夾index01下出現了一些文件：