lucene--索引工具類

建立索引的步驟:

0.建立分詞器

Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_36);

1.建立Directory,索引存放的位置

Directory directory = FSDirectory.open(new File("E:/Lucene/demo"));

2.建立IndexWrite,索引寫入器

IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_36,analyzer);

IndexWrite write = new IndexWriter(directory,iwc);

3.建立Document對象

Document doc = new Document();

4.給Document添加Field

doc.add(new Field("name",names[i],Store.YES,Index.ANALYZED)); --添加字元串

doc.add(new NumericField("attach",Store.YES,true).setIntValue(23));  --添加整數

doc.add(new NumericField("attach",Store.YES,true).setDoubleValue(2.5d)); --添加雙精度浮點

doc.add(new NumericField("attach",Store.YES,true).setFloatValue(3.6f)); --添加單精度浮點

doc.add(new NumericField("attach",Store.YES,true).setLongValue(44));  --添加長整型

doc.add(new NumericField("date",Store.YES,true).setLongValue(201254221)); --添加日期

doc.setBoost(2.5); --權重

5.添加文檔到索引

writer.addDocument(doc);

6.送出或者關閉IndexWrite寫入器(隻有這樣,索引才會正常建立)

writer.commit();

writer.close();

知識點

一、第0步驟的分詞器(可以自定義分詞器,重難點)

二、第1步驟建立索引檔案目錄(單例模式建立)

三、給Document添加域(不同資料類型的域值操作)

單例模式建立Directory、IndexReader、IndexSearcher代碼：

private static IndexReader reader;

private static Directory directory;

static{

try {

directory = FSDirectory.open(new File("E:/Lucene/demo"));

reader = IndexReader.open(directory);

} catch (IOException e) {

e.printStackTrace();

}

}

public static Directory getDictionary(){

return directory;

}

public static IndexReader getIndexReader(){

return reader;

}

public static IndexSearcher getIndexSearcher(){

try {

if(reader != null){

reader = IndexReader.open(directory);

}else{

IndexReader ir = IndexReader.openIfChanged(reader);

if(ir != null){

reader.close();

reader = ir;

}

}

return new IndexSearcher(reader);

} catch (CorruptIndexException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

public static void closeSearcher(IndexSearcher searcher){

try {

if(searcher != null){

searcher.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

public void closeWrite(IndexWriter indexWriter){

try {

if(indexWriter != null){

indexWriter.close();

}

} catch (CorruptIndexException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}