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(); }
六、数据记录和计算:
项目的结构图:
七、实验结果或结论:
总结:通过这次的实验,我基本理解Lucene中的Document-Field结构的数据建模过程, 能编针对特定数据生成索引文件.在这次的实验过程中,实验不是很顺利,这次实验让我感受到了Lucene的强大,增加我对Lucene的兴趣!
八、备注或说明:
九、引用参考文献:
http://lucene.apache.org