lucene--索引工具类
创建索引的步骤:
0.创建分词器
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_36);
1.创建Directory,索引存放的位置
Directory directory = FSDirectory.open(new File("E:/Lucene/demo"));
2.创建IndexWrite,索引写入器
IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_36,analyzer);
IndexWrite write = new IndexWriter(directory,iwc);
3.创建Document对象
Document doc = new Document();
4.给Document添加Field
doc.add(new Field("name",names[i],Store.YES,Index.ANALYZED)); --添加字符串
doc.add(new NumericField("attach",Store.YES,true).setIntValue(23)); --添加整数
doc.add(new NumericField("attach",Store.YES,true).setDoubleValue(2.5d)); --添加双精度浮点
doc.add(new NumericField("attach",Store.YES,true).setFloatValue(3.6f)); --添加单精度浮点
doc.add(new NumericField("attach",Store.YES,true).setLongValue(44)); --添加长整型
doc.add(new NumericField("date",Store.YES,true).setLongValue(201254221)); --添加日期
doc.setBoost(2.5); --加权
5.添加文档到索引
writer.addDocument(doc);
6.提交或者关闭IndexWrite写入器(只有这样,索引才会正常创建)
writer.commit();
writer.close();
知识点
一、第0步骤的分词器(可以自定义分词器,重难点)
二、第1步骤创建索引文件目录(单例模式创建)
三、给Document添加域(不同数据类型的域值操作)
单例模式创建Directory、IndexReader、IndexSearcher代码：
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();
}
}
/**
* 获取索引目录
* @return
* @author:qiuchen
*/
public static Directory getDictionary(){
return directory;
}
/**
* 获取读取器
* @return
* @author:qiuchen
*/
public static IndexReader getIndexReader(){
return reader;
}
/**
* 获取查询器
* @return
* @author:qiuchen
*/
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;
}
/**
* 关闭查询器
* @param searcher
* @author:qiuchen
*/
public static void closeSearcher(IndexSearcher searcher){
try {
if(searcher != null){
searcher.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 关闭写入器
* @param indexWriter
* @author:qiuchen
*/
public void closeWrite(IndexWriter indexWriter){
try {
if(indexWriter != null){
indexWriter.close();
}
} catch (CorruptIndexException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}