• *创建索引初步


    在全文检索工具中,是由这样的三个部分组成:

    1.索引部分,

    2.分词部分,

    3.搜索部分。

    【创建索引】

    步骤:

    1.创建Directory(索引建立在什么地方?内存or硬盘)

    2.创建IndexWriter.(通过IndexWriter来写索引)

    3.创建Document对象。

    4.位Document添加Field
       注:Filed是Document中的子元素。


    5.通过IndexWriter添加文档到索引中

    【实践】

    创建索引代码:

    HelloLucene.java:

     1 package com.hk.test;
     2 
     3 import java.io.File;
     4 import java.io.FileReader;
     5 import java.io.IOException;
     6 import java.io.Reader;
     7 import org.apache.lucene.analysis.TokenStream;
     8 import org.apache.lucene.analysis.standard.StandardAnalyzer;
     9 import org.apache.lucene.document.Document;
    10 import org.apache.lucene.document.Field;
    11 import org.apache.lucene.document.Fieldable;
    12 import org.apache.lucene.index.CorruptIndexException;
    13 import org.apache.lucene.index.IndexWriter;
    14 import org.apache.lucene.index.IndexWriterConfig;
    15 import org.apache.lucene.index.FieldInfo.IndexOptions;
    16 import org.apache.lucene.store.Directory;
    17 import org.apache.lucene.store.FSDirectory;
    18 import org.apache.lucene.store.LockObtainFailedException;
    19 import org.apache.lucene.store.RAMDirectory;
    20 import org.apache.lucene.util.Version;
    21 
    22 public class HelloLucene {
    23     /*
    24      * 建立索引
    25      */
    26     public void index() {
    27         IndexWriter writer = null;
    28         
    29         try {
    30             //1.创建Directory(索引建立在什么地方?内存or硬盘)
    31             //Directory directory = new RAMDirectory();//建立在内存中
    32             Directory directory = FSDirectory.open(new File("D:/lucene/index01"));//创建在磁盘上
    33             
    34             //2.创建IndexWriter.(通过IndexWriter来写索引)
    35             IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_35, new StandardAnalyzer(Version.LUCENE_35));
    36             
    37             writer = new IndexWriter(directory, iwc);
    38             
    39             //3.创建Document对象。
    40             Document doc = null;
    41             //4.为Document添加Field
    42             File f = new File("D:/lucene");
    43             for(File file:f.listFiles()){
    44                 doc = new Document();
    45                 doc.add(new Field("content",new FileReader(file)));
    46                 //Field.Store.YES是否把这个文件的全名存储在硬盘中
    47                 //Field.Index.ANALYZED.NOT_ANALYZED对文件名不需要分词,因为它本来就是一个词
    48                 doc.add(new Field("fileName",file.getName(),Field.Store.YES,Field.Index.ANALYZED.NOT_ANALYZED));
    49                 doc.add(new Field("path",file.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));
    50                 
    51             }
    52             //5.通过IndexWriter添加文档到索引中
    53             
    54             
    55         } catch (CorruptIndexException e) {
    56             // TODO Auto-generated catch block
    57             e.printStackTrace();
    58         } catch (LockObtainFailedException e) {
    59             // TODO Auto-generated catch block
    60             e.printStackTrace();
    61         } catch (IOException e) {
    62             // TODO Auto-generated catch block
    63             e.printStackTrace();
    64         }finally{
    65             if(writer != null)
    66                 try {
    67                     writer.close();
    68                 } catch (CorruptIndexException e) {
    69                     // TODO Auto-generated catch block
    70                     e.printStackTrace();
    71                 } catch (IOException e) {
    72                     // TODO Auto-generated catch block
    73                     e.printStackTrace();
    74                 }
    75         }
    76     }
    77 }

    测试索引

    testIndex.java:

     1 package com.hk.test;
     2 
     3 import org.junit.Test;
     4 
     5 public class TestLucene {
     6     @Test
     7     public void testIndex(){
     8         HelloLucene hello = new HelloLucene();
     9         hello.index();
    10     }
    11 
    12 }

    运行结果:

  • 相关阅读:
    mongodb基本操作,CRUD
    java客户端验证https连接(忽略证书验证和证书验证两种方式)
    学习计划
    Javascript中Generator(生成器)
    JS
    mysql把一字段拆分为多行
    5个最优秀的微信小程序UI组件库
    rhel6 mysql skip-grant-tables 添加用户报错 ERROR 1290
    centos7.2 apache开启.htaccess
    centos 7.2 安装apache,mysql,php5.6
  • 原文地址:https://www.cnblogs.com/zhzcode/p/9849787.html
Copyright © 2020-2023  润新知