【Lucene实验1】构建索引

一、实验名称：构建索引

二、实验日期：2013/9/21

三、实验目的：

1) 能理解Lucene中的Document-Field结构的数据建模过程；

2) 能编针对特定数据生成索引文件。

四、实验用的仪器和材料：

MyEclipse 10，JDK

五、实验的步骤和方法：

题目一：在指定目录生成表示3本书的索引，要求建立3个document分别存放书名数据。把生成的索引文件截好图（复合索引与一般索引各生成一次）

图1：一般索引的截图

图2：复合索引的截图

题目二：修改题目一的代码，使用多值域在一个文档中存放3本书的书名值。

题目三：针对题目一的三个文档，分别做如下操作：根据书名在索引中删除一个值、修改一个文档的域值。

实验过程：

题目一源代码：

package lab02;
 
import java.io.File;
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.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
 
public class GreatIndex {
    public static void main(String[] args) {
        GreatIndex GreateIndexobj=new GreatIndex();
        try {
             GreateIndexobj.setUp();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }
    private String indexDir="E:/Users/Administrator/Workspaces/MyEclipse 10/mylucene/src/lab02/index";
    private Directory directory; //表示索引存放的目录
    public void setUp()throws Exception {
        //directory =new RAMDirectory(); //索引存放在内存的RAM中
        directory =FSDirectory.open((new File(indexDir))); //索引存放在物理硬盘的文件系统内（就是存放指定路径）
        IndexWriter writer=new IndexWriter(directory,
                new StandardAnalyzer(Version.LUCENE_30),true,IndexWriter.MaxFieldLength.UNLIMITED);
        //write.setUseCompoundFile(false);//设置false就是使用一般索引（有多种文件的）
        //建立3本书的document
        Document doc1=new Document();
        Document doc2=new Document();
        Document doc3=new Document();
        //建立名字叫“bookname”的field并添加域值到文档中，设置国域值存储到索引中，不被分词与加权
        doc1.add(new Field("bookname", "伐清",
                Field.Store.YES,
                Field.Index.NOT_ANALYZED_NO_NORMS));
        doc2.add(new Field("bookname", "奥术神座",
                Field.Store.YES,
                Field.Index.NOT_ANALYZED_NO_NORMS));
        doc1.add(new Field("bookname", "冰与火之歌",
                Field.Store.YES,
                Field.Index.NOT_ANALYZED_NO_NORMS));
        writer.addDocument(doc1);
        writer.addDocument(doc2);
        writer.addDocument(doc3);
        writer.close(); 
    }
}

题目二源代码：

package lab02;
 
import java.io.File;
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.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;
 
public class GreatIndex {
    public static void main(String[] args) {
        GreatIndex GreateIndexobj=new GreatIndex();
        try {
            //GreateIndexobj.setUp();
             GreateIndexobj.setUp2();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }
    private String indexDir="E:/Users/Administrator/Workspaces/MyEclipse 10/mylucene/src/lab02/index";
    private Directory directory; //表示索引存放的目录
    private String[] booknames={"伐清","奥术神座","冰与火之歌"};
    public void setUp2() throws Exception{
        //directory =new RAMDirectory(); //索引存放在内存的RAM中
        directory =FSDirectory.open((new File(indexDir))); //索引存放在物理硬盘的文件系统内（就是存放指定路径）
        IndexWriter writer=new IndexWriter(directory,
                new StandardAnalyzer(Version.LUCENE_30),true,IndexWriter.MaxFieldLength.UNLIMITED);
        //writer.setUseCompoundFile(false);//设置false就是使用一般索引（有多种文件的）
        //建立包含三个域值的document
        Document doc=new Document();
        for (String bookname:booknames) {
            doc.add(new Field("bookname",bookname,Field.Store.YES,
                    Field.Index.NOT_ANALYZED_NO_NORMS));
        }
        writer.addDocument(doc);        
        writer.close();
    }
}

题目三源代码：

  //题目三
    public void DeleteDocument()throws IOException{
        IndexWriter writer=new IndexWriter(directory,
                new StandardAnalyzer(Version.LUCENE_30),true,IndexWriter.MaxFieldLength.UNLIMITED);
        writer.optimize();//使用优化策略删除文档（直接删除，不能回复）
        writer.deleteDocuments(new Trem("bookname", "伐清"));
writer.close();
    }
    public void UpdateDocument() throws IOException{
        IndexWriter writer=new IndexWriter(directory,
                new StandardAnalyzer(Version.LUCENE_30),true,IndexWriter.MaxFieldLength.UNLIMITED);
        //构建一个新的document用与替换
        Document doc=new Document();
        doc.add(new Field("bookname","Lucene实战第二版",
                Field.Store.YES,
                Field.Index.NOT_ANALYZED_NO_NORMS));
        writer.updateDocument(new Term("bookname","官仙"), doc);
        writer.close();
    }