lucene搜索

reader.undeleteAll();//恢复

package com.firstproject.testindex;

import java.io.IOException;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class UnDeleteDocument {

    public static void main(String[] args) throws IOException {
        String indexDir="d:/luceneindex";
        Directory dir=FSDirectory.getDirectory(indexDir);
        IndexReader reader=IndexReader.open(dir);

        System.out.println("before undelete:"+reader.numDocs());

//      reader.deleteDocuments(new Term("id","1"));


        reader.undeleteAll();//恢复

        System.out.println("after  undelete:"+reader.numDocs());

        reader.close();
        dir.close();

    }

}

设置重要程度
document.setBoost(1.5f);//比较重要
document.setBoost(0.5f);//不重要

package com.firstproject.testindex;

import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class UpdateDocument {
    public static void main(String[] args) throws IOException {
        Analyzer analyzer=new StandardAnalyzer();
        String indexDir="d:/luceneindex";
        Directory dir=FSDirectory.getDirectory(indexDir);
        IndexReader reader=IndexReader.open(dir);
        System.out.println("before delete : "+reader.numDocs());
        reader.deleteDocuments(new Term("id","2"));
        System.out.println("after delete : "+reader.numDocs());
        reader.close();
        IndexWriter writer=new IndexWriter(dir,analyzer,true,IndexWriter.MaxFieldLength.LIMITED);
        Document document=new Document();
        Field field1=new Field("id","2",Field.Store.YES,Field.Index.ANALYZED);
        field1.setBoost(1.5f);
        document.add(field1);
        document.add(new Field("name","Tom",Field.Store.YES,Field.Index.NO));
        document.add(new Field("address","tianjin",Field.Store.YES,Field.Index.ANALYZED));
//      document.setBoost(1.5f);//比较重要
        document.setBoost(0.5f);//不重要
        writer.addDocument(document);
        writer.close();
        reader=IndexReader.open(dir);
        System.out.println("after add : "+reader.numDocs());
        reader.close();
        dir.close();
    }
}

Lucene 的常用检索类
IndexSearcher ：检索操作的核心组件，用于对 IndexWriter 创建的索引执行，只读的检索操作，工作模式为接收 Query 对象而返回 ScoreDoc对象。
Term ：检索的基本单元，标示检索的字段名称和检索对象的值，如Term( “title”, “lucene” )。即表示在 title 字段中搜寻关键词 lucene 。
Query ：表示查询的抽象类，由相应的 Term 来标识。
TermQuery ：最基本的查询类型，用于匹配含有指定值字段的文档。
TopDocs:保存查询结果的类。
ScoreDoc(Hits)：用来装载搜索结果文档队列指针的数组容器。