[学习笔记]IK分词器的学习

本文介绍: ik_max_word最细切分，占用内存多，但是分词多ik_sm art最少切分，占用内存少，但是分词少standard 中文没用`id` bi g int(20) NOT NULL COMMENT ‘酒店id‘,`name` v ar char(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT ‘酒店名称’,

IK分词器有几种模式

# 测试分词器
POST /_analyze
{
  "text":"黑马程序员学习java太棒了",
  "analyzer": "standard"
}

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# 测试分词器
POST /_analyze
{
  "text":"黑马程序员学习java太棒了",
  "analyzer": "ik_max_word"
}

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# 测试分词器
POST /_analyze
{
  "text":"黑马程序员学习java太棒了",
  "analyzer": "ik_smart"
}

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总结

ik_max_word最细切分，占用内存多，但是分词多
ik_smart最少切分，占用内存少，但是分词少
stand ar d 中文没用

IK分词器如何拓展词条？如何停用词条

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配置你的ext.dic和stopword.dic
ext.dic

map ping 属性

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文档 操作

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分词 规则 总结

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CREATE TABLE `tb_hotel`  (
  `id` bigint(20) NOT NULL COMMENT '酒店id',
  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '酒店名称',
  `address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '酒店地址',
  `price` int(10) NOT NULL COMMENT '酒店价格',
  `score` int(2) NOT NULL COMMENT '酒店评分',
  `brand` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '酒店品牌',
  `city` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '所在城市',
  `star_name` varchar(16) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '酒店星级，1星到5星，1钻到5钻',
  `business` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '商圈',
  `latitude` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '纬度',
  `longitude` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '经度',
  `pic` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '酒店图片',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Compact;

# 酒店的mapping
PUT /hotel
{
  "mappings": {
      "properties": {
        "id":{
          "type": "keyword"
        },
        "name":{
          "type": "text",
          "analyzer": "ik_max_word",
          "copy_to": "all"
        },
        "address":{
          "type":"keyword",
          "index": false
        },
        "price":{
          "type":"integer"
        },
        "score":{
          "type":"integer"
        },
        "brand":{
          "type": "keyword"
        },
        "city":{
          "type":"keyword"
        },
        "star_name":{
          "type": "keyword"
        },
        "business":{
          "type": "keyword",
          "copy_to": "all"
        },
        "location":{
          "type":"geo_point"
        },
        "pic":{
          "type": "keyword",
          "index": false
        },
        "all":{
          "type": "text",
          "analyzer": "ik_max_word"
        }
      }
  }

Java的测试代码

package cn.itcast.hotel.constants;

public class HotelIndexConstants {
    public static final String MAPPING_TEMPLATE = "{n" +
            "  "mappings": {n" +
            "      "properties": {n" +
            "        "id":{n" +
            "          "type": "keyword"n" +
            "        },n" +
            "        "name":{n" +
            "          "type": "text",n" +
            "          "analyzer": "ik_max_word",n" +
            "          "copy_to": "all"n" +
            "        },n" +
            "        "address":{n" +
            "          "type":"keyword",n" +
            "          "index": falsen" +
            "        },n" +
            "        "price":{n" +
            "          "type":"integer"n" +
            "        },n" +
            "        "score":{n" +
            "          "type":"integer"n" +
            "        },n" +
            "        "brand":{n" +
            "          "type": "keyword"n" +
            "        },n" +
            "        "city":{n" +
            "          "type":"keyword"n" +
            "        },n" +
            "        "star_name":{n" +
            "          "type": "keyword"n" +
            "        },n" +
            "        "business":{n" +
            "          "type": "keyword",n" +
            "          "copy_to": "all"n" +
            "        },n" +
            "        "location":{n" +
            "          "type":"geo_point"n" +
            "        },n" +
            "        "pic":{n" +
            "          "type": "keyword",n" +
            "          "index": falsen" +
            "        },n" +
            "        "all":{n" +
            "          "type": "text",n" +
            "          "analyzer": "ik_max_word"n" +
            "        }n" +
            "      }n" +
            "  }n" +
            "  ";
}

package cn.itcast.hotel;

import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.service.impl.HotelService;
import com.alibaba.fastjson.JSON;
import org.apache.http.HttpHost;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.common.xcontent.XContentType;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.IOException;

import static cn.itcast.hotel.constants.HotelIndexConstants.MAPPING_TEMPLATE;

/**
 * @author lst
 * @date 2023年11月23日 13:38
 */
@SpringBootTest
public class HotelT {
    private RestHighLevelClient restHighLevelClient;
    @Autowired
    HotelService hotelService;

    @BeforeEach
    public void before() {
        restHighLevelClient = new RestHighLevelClient(RestClient.builder(HttpHost.create("http://localhost:9200")));
    }

    @AfterEach
    void tearDown() throws IOException {
        restHighLevelClient.close();
    }

    @Test
    public void testCreateIndex() throws IOException {
        CreateIndexRequest request = new CreateIndexRequest("hotel");
        request.source(MAPPING_TEMPLATE, XContentType.JSON);
        restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
    }

    @Test
    public void testDeleteIndex() throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest("hotel");
        restHighLevelClient.indices().delete(request, RequestOptions.DEFAULT);
    }
}