3.2节我们已经运行了一个Lucene建立索引的小程序，这一节我们就以这个小程序为例讲解一下Lucene建立索引的过程。
1 import java.nio.charset.StandardCharsets; 2 import java.nio.file.Files; 3 import java.nio.file.Paths; 4 import java.io.*; 5 6 import org.apache.lucene.analysis.standard.StandardAnalyzer; 7 import org.apache.lucene.document.Document; 8 import org.apache.lucene.document.Field; 9 import org.apache.lucene.document.StringField; 10 import org.apache.lucene.document.TextField; 11 import org.apache.lucene.index.IndexWriter; 12 import org.apache.lucene.index.IndexWriterConfig; 13 import org.apache.lucene.store.Directory; 14 import org.apache.lucene.store.FSDirectory; 15 import org.apache.lucene.util.Version; 16 17 /** 18 * @author csl 19 * @description: 20 * 依赖jar：Lucene-core，lucene-analyzers-common，lucene-queryparser 21 * 作用：简单的索引建立 22 */ 23 public class Indexer { 24 public static Version luceneVersion = Version.LATEST; 25 /** 26 * 建立索引 27 */ 28 public static void createIndex(){ 29 IndexWriter writer = null; 30 try{ 31 //1、创建Directory 32 //Directory directory = new RAMDirectory();//创建内存directory 33 Directory directory = FSDirectory.open(Paths.get("index"));//在硬盘上生成Directory00 34 //2、创建IndexWriter 35 IndexWriterConfig iwConfig = new IndexWriterConfig( new StandardAnalyzer()); 36 writer = new IndexWriter(directory, iwConfig); 37 //3、创建document对象 38 Document document = null; 39 //4、为document添加field对象 40 File f = new File("raw");//索引源文件位置 41 for (File file:f.listFiles()){ 42 document = new Document(); 43 document.add(new StringField("path", f.getName(),Field.Store.YES)); 44 System.out.println(file.getName()); 45 document.add(new StringField("name", file.getName(),Field.Store.YES)); 46 InputStream stream = Files.newInputStream(Paths.get(file.toString())); 47 document.add(new TextField("content", new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))));//textField内容会进行分词 48 //document.add(new TextField("content", new FileReader(file))); 如果不用utf-8编码的话直接用这个就可以了 49 writer.addDocument(document); 50 } 51 }catch(Exception e){ 52 e.printStackTrace(); 53 }finally{ 54 //6、使用完成后需要将writer进行关闭 55 try { 56 writer.close(); 57 } catch (IOException e) { 58 e.printStackTrace(); 59 } 60 } 61 } 62 public static void main(String[] args) throws IOException 63 { 64 createIndex(); 65 } 66 }