Lucene——索引删改

还是那两个java文件

IndexUtil.java

Reader就是一根输入的管道，Writer就是一个输出的管道

IndexWriter.deleteDocument()//可以删除Query也可以删除Term

IndexReader.undeleteAll()

IndexWriter.forceMergeDelere()

IdexWriter.updateDocument()

通过IndexReader.numDocs()、maxDoc()、numDeletedDocs()查看删除情况

 

package org.itat.index;//创建索引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.CorruptIndexException;import org.apache.lucene.index.IndexReader;import org.apache.lucene.index.IndexWriter;import org.apache.lucene.index.IndexWriterConfig;import org.apache.lucene.index.Term;import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.store.LockObtainFailedException;import org.apache.lucene.util.Version;public class IndexUtil {private String[] ids={"1","2","3","4","5","6"};private String[] emails={"[e-mail]","[e-mail]","[e-mail]","dd@@dd.org","[e-mail]","[e-mail]"};private String[] contents={"helloaa","helloboy","hellocc","hellodog","helloegg","hellofox"};private int[] attachs={1,2,3,4,5,6};private String[] names={"zhangsan","lisi","wangwu","zhaoliu","wuba","chenjiu"};private Directory directory=null;public IndexUtil(){try {directory=FSDirectory.open(new File("e:/lucene/index02"));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void query(){try {IndexReader reader=IndexReader.open(directory);System.out.println("numdocs:"+reader.numDocs());System.out.println("maxDocs:"+reader.maxDoc());System.out.println("detelemaxDocs:"+reader.numDeletedDocs());reader.close();} catch (CorruptIndexException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void index(){   IndexWriter writer=null;   Document doc=null;   try {//   writer.deleteAll(); writer =new IndexWriter(directory,new IndexWriterConfig(Version.LUCENE_35,    new StandardAnalyzer(Version.LUCENE_35)));for(int i=0;i<ids.length;i++){doc=new Document();    doc.add(new Field("id",ids[i],Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));    doc.add(new Field("emails",emails[i],Field.Store.YES,Field.Index.NOT_ANALYZED));    doc.add(new Field("contents",contents[i],Field.Store.NO,Field.Index.ANALYZED));    //谷歌搜索前面那个简介就是权值    doc.add(new Field("name",names[i],Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));    writer.addDocument(doc); }} catch (CorruptIndexException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (LockObtainFailedException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}   finally{   if(writer!=null)   {  try {writer.close();} catch (CorruptIndexException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}      }   }}//删除public void delete()          {              IndexWriter writer=null;              try {                  writer=new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_35,                          new StandardAnalyzer(Version.LUCENE_35)));                  //参数是一个选项.可以是一个query，也可以是一个term  term就是一个精确查找的值                   //此时删除的文档并未完全删除，而是存储在回收站中，可以恢复的                   writer.deleteDocuments(new Term("id","1"));              } catch (CorruptIndexException e) {                  e.printStackTrace();              } catch (LockObtainFailedException e) {                  e.printStackTrace();              } catch (IOException e) {                  e.printStackTrace();              }              finally{                  if (writer!=null) {                      try {                          writer.close();                      } catch (CorruptIndexException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      } catch (IOException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      }                  }              }          } //恢复public void undelete()          {              try {                  //恢复时必须把reader的只读设为false                   IndexReader reader=IndexReader.open(directory,false);                  reader.undeleteAll();                                  reader.close();              } catch (CorruptIndexException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              } catch (IOException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              }                        } //清空回收站，强制优化           public void forceDelete()          {              IndexWriter writer=null;              try {                  writer=new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_35,                          new StandardAnalyzer(Version.LUCENE_35)));                  writer.forceMergeDeletes();             } catch (CorruptIndexException e) {                  e.printStackTrace();              } catch (LockObtainFailedException e) {                  e.printStackTrace();              } catch (IOException e) {                  e.printStackTrace();              }              finally{                  if (writer!=null) {                      try {                          writer.close();                      } catch (CorruptIndexException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      } catch (IOException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      }                  }              }          }          public void merge()          {              IndexWriter writer=null;              try {                  writer=new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_35,                          new StandardAnalyzer(Version.LUCENE_35)));                  //将索引合并为两段，建议不实用，开销太大                writer.forceMerge(2);              } catch (CorruptIndexException e) {                  e.printStackTrace();              } catch (LockObtainFailedException e) {                  e.printStackTrace();              } catch (IOException e) {                  e.printStackTrace();              }              finally{                  if (writer!=null) {                      try {                          writer.close();                      } catch (CorruptIndexException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      } catch (IOException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      }                  }              }          }          //更新索引           public void update()          {  //            lucene本身不支持更新 //            通过删除索引然后再建立索引来更新                             IndexWriter writer=null;                 Document doc=null;                 try {                  writer =new IndexWriter(directory,new IndexWriterConfig(Version.LUCENE_35,                              new StandardAnalyzer(Version.LUCENE_35)));                                                         doc=new Document();                      doc.add(new Field("id","111",Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));                      doc.add(new Field("emails",emails[0],Field.Store.YES,Field.Index.NOT_ANALYZED));                      doc.add(new Field("contents",contents[0],Field.Store.NO,Field.Index.ANALYZED));                      doc.add(new Field("name",names[0],Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));                      writer.updateDocument(new Term("id","1"), doc);                                 } catch (CorruptIndexException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              } catch (LockObtainFailedException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              } catch (IOException e) {                  // TODO Auto-generated catch block                   e.printStackTrace();              }                 finally{                     if(writer!=null)                     {                        try {                          writer.close();                      } catch (CorruptIndexException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      } catch (IOException e) {                          // TODO Auto-generated catch block                           e.printStackTrace();                      }                        }                 }              }    }

测试类

package org.itat.test;import org.itat.index.IndexUtil;import org.junit.Test;public class TestIndex {@Testpublic void testIndex(){IndexUtil index=new IndexUtil();index.index();    }@Testpublic void testQuery(){IndexUtil index=new IndexUtil();index.query();}@Testpublic void testDelete(){IndexUtil index=new IndexUtil();index.delete();}@Testpublic void testUnDelete(){IndexUtil index=new IndexUtil();index.undelete();}@Testpublic void testForceDelete(){IndexUtil index=new IndexUtil();index.forceDelete();}@Testpublic void testUpdate(){IndexUtil index=new IndexUtil();index.update();}}