//索引的读取工具IndexReader
//在Lucene中的index包中有一个重要的工具IndexReader。
//它主要负责对索引的各种读取和维护工作。
//IndexReader本身是一个抽象类。它有一个子类MultiReader&＃xff0c;
//通常&＃xff0c;无须关注其子类的实现&＃xff0c;因为IndexReader本身提供了一个静态方法
//来获取一个它的子类的实现
package index;
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.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
public class IndexWriter {
IndexReader reader &＃61; IndexReader.open(INDEX_STORE_PATH);
//创建索引
IndexWriter writer &＃61; new IndexWriter(INDEX_STORE_PATH, new StandardAnalyzer(), true);
writer.setUseCompoundFile(false);
Document doc1 &＃61; new Document();
Document doc2 &＃61; new Document();
Document doc3 &＃61; new Document();
Field f1 &＃61; new Field("bookname", "钢铁是怎么样炼成的", Field.Store.YES, Field.Index.TOKENIZED);
Field f2 &＃61; new Field("bookname", "英雄儿女", Field.Store.YES, Field.Index.TOKENIZED);
Field f3 &＃61; new Field("bookname", "篱笆女人和狗", Field.Store.YES, Field.Index.TOKENIZED);
doc1.add(f1);
doc2.add(f2);
doc3.add(f3);
writer.addDocument(doc1);
writer.addDocument(doc2);
writer.addDocument(doc3);
writer.close();
//使用IndexReader来读取索引
IndexReader reader&＃61; IndexReader.open(INDEX_STORE_PATH);
//显示索引内所有的Document
System.out.println("索引文档列表: ");
for(int i &＃61; 0; i System.out.println(reader.document(i));
}
//输出当前索引的版本信息
System.out.println("版本: " &＃43; reader.getVersion());
//输出当前索引的文档数量
System.out.println("索内的文档数量: " &＃43; reader.numDocs());
//构造一个词条并在索引中查找
System.out.println();
System.out.println("查找词条 &＃39;女&＃39; ");
Term term1 &＃61; new Term("bookname", "女");
TermDocs docs &＃61; reader.termDocs(term1);
while(docs.next()){
System.out.println("---------------------");
System.out.println("含有所有查找的<" &＃43; term1 &＃43; ">的Docuemnt的编号为" &＃43; docs.doc());
System.out.println("Term在文档中的出现次数" &＃43; docs.freq());
System.out.println("---------------------");
}
reader.close();
//在此向索引目录中添加一个文档
IndexWriter writer2 &＃61; new IndexWriter(INDEX_STORE_PATH, new StandardAnalyzer(), false);
writer2.serUseCompoundFile(false);
Document doc4 &＃61; new Document();
Field f4 &＃61; new Field("bookname", "钢 铁 战 士", Field.Store.YES, Field.Index.TOKENIZED);
doc4.add(f4);
writer2.addDocument(doc4);
writer2.close();
System.out.println("&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;");
//使用IndexReader来读取索引
IndexReader reader2 &＃61; new IndexReader.open(INDEX_STORE_PATH);
//显示索引中的所有文件
for(int i &＃61; 0; i System.out.println(reader2.document(i));
}
//输出当前索引的版本信息
System.out.println("版本" &＃43; reader2.getVersion());
//输出当前索引的文档数量
System.out.println("索内的文的数量" &＃43; reader2.numDocs());
System.out.println("查找词条&＃39;女&＃39;");
Term term2 &＃61; new Term("bookname", "女");
docs &＃61; reader.termDocs(term2);
while(docs.next()){
System.out.println("------------------------");
System.out.println("含有所查找的<" &＃43; term2 &＃43; ">的Document的编号为 " &＃43; docs.doc());
System.out.println("Term在文档中出现的次数" &＃43; docs.freq());
System.out.println("------------------------");
}
System.out.println();
System.out.println("查找词条&＃39;钢&＃39;");
Term term3 &＃61; new Term("bookname","钢");
docs &＃61; reader2.termDocs(term3);
while(docs.next()){
System.out.println("------------------------");
System.out.println("含有所查找的<" &＃43; term3 &＃43; ">的Document的编号为 " &＃43; docs.doc());
System.out.println("Term在文档中出现的次数" &＃43; docs.freq());
System.out.println("------------------------");
}
}
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