elasticsearch使用

加上允许跨域设置：

http.cors.enabled: true
http.cors.allow-origin: "*"

 然后去elasticsearch-head-master文件中，cmd，启动控制es(elasticsearch)的网页，类似navicat软件一样。

• npm install
• npm run start

 然后再启动kibana，这个就是一个专门查询，添加es的项目：

这个更简单，直接点击启动：

不过启动后时英文的，可以配置为中文：

i18n.locale: "zh-CN" 

 ik分词器：

下载下来后解压到plugins目录中：

然后运行：kibana

ik分词器两种操作：

1、ik_max_word 最细粒度

GET _analyze
{
  "analyzer": "ik_max_word",
  "text": "我爱中国共产党"
}
 

2、ik_smart 最粗粒度

#插入数据
POST /sys_user1/_doc
{
  "name":"qx",
  "age":18
}

#创建索引规则（建库）
PUT /sys_user1
{
  "mappings": {
    "properties": {
      "user_type": {
        "type": "text"
      },
      "user_name":{
        "type": "text"
      },
      "user_age":{
        "type":"long"
      }
    }
  }
}

GET /sys_user1

PUT /test3/_doc/1
{
"name":"qx1",
"age":20
}

GET /test3

#修改1
PUT /shujuku/type1/t3
{
  "name":"qx2",
  "age":182,
  "gender":12
}
#修改2
POST /shujuku/_update/t3
{
  "doc": {
    "name": "qx942"
  }
}
#删除
DELETE /shujuku/_doc/t3


GET /shujuku/type1/_search
{
  "query": {
    "match": {
      "name": "qx"
    }
  },
  指定显示字段
  "_source": ["name","age"],
  排序
  "sort": [
    {
      "age": {
        "order": "desc"
      }
    }
  ],
  分页
  "from": 0,
  "size": 2
}


GET shujuku/type1/_search
{
  "query": {
    "bool": {
      or查询
      "should": [
        {
          "match": {
            "name": "qx"
          }
        },
        {
          "match": {
            "age": 20
          }
        }
      ]
    }
  }
}



GET shujuku/type1/_search
{
  "query": {
    "bool": {
      and查询
      "must": [
        {
          "match": {
            "name": "qx"
          }
        },
        {
          "match": {
            "age": 20
          }
        }
      ]
    }
  }
}



GET shujuku/type1/_search
{
  "query": {
    "bool": {
范围查询，age大于20，小于300
      "filter": {
        "range": {
          "age": {
            "gt": 20,
            "lt": 300
          }
        }
      }
    }
  },
  "_source": [
    "age"
  ]
}



match查询时text类型会被分词器解析，
GET querytest/_search
{
  "query": {
    "match": {
      "name":"瞿肖"
    }
  }
}

match查询时keyword类型也是精确查询
GET querytest/_search
{
  "query": {
    "match": {
      "desc":"你说得没错"
    }
  }
}

term只能和keyword配合
GET querytest/_search
{
  "query": {
    "term": {
      "desc":"你说得没错"
    }
  }
}



GET querytest/_search
{
  "query": {
    "match": {
      "age":20
    }
  },
  "highlight": {
    "fields": {
      "name": {}，
      "age":P{
    },
    高亮前缀
        "pre_tags": "<span style='color: red'>",
    高亮后缀
    "post_tags": "</span>"
  }
}



GET querytest/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "match": {
            "desc": "你说得没错"
          }
        },
        {
          "match": {
            "name": "瞿肖"
          }
        }
      ]
    }
  },
  "highlight": {
    "fields": {
      "desc": {},
      "name": {}
    },
    "pre_tags": "<span style='color: red'>",
    "post_tags": "</span>"
  }
}

jav

a集成es操作：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>elasticsearchDom</artifactId>
    <version>1.0-SNAPSHOT</version>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <elasticsearch.version>7.6.1</elasticsearch.version>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--        java 操作es框架-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>2.0.25</version>
        </dependency>
        <!--        生成uuid数字工具包-->
        <!--        UUID.fromString(Generators.timeBasedGenerator().generate().toString()).node()-->
        <dependency>
            <groupId>com.fasterxml.uuid</groupId>
            <artifactId>java-uuid-generator</artifactId>
            <version>3.1.4</version>
        </dependency>

    </dependencies>
</project>

然后直接将客户端配置到bean中，然后使用它：

package com.es.server;

import com.es.entity.ItemES;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @program: elasticsearchDom
 * @author: quxiao
 * @create: 2024-04-04 09:55
 **/
@Service
public interface ItemServer extends ElasticsearchRepository<ItemES, String> {
    /**
     * 查询名称或描述
     */
    List<ItemES> findByNameOrDesc(String name, String desc);

    /**
     * 查询名称 并且分页
     */
    Page<ItemES> findByName(String name, Pageable pageable);

    /**
     * 查询价格在min-max之间的商品
     */
    List<ItemES> findByPriceBetween(Double min, Double max);

    /**
     * 查询价格在min-max之间的商品，并且按照价格降序
     */
    List<ItemES> findByPriceBetweenOrderByPriceDesc(Double min, Double max);
}

基础的增删改查也实现了：

springBoot约定大于配置又开始了，只要我们按照Date Elasticsearch 框架约定的方法名方式，就可以快速的写好对es的操作代码。

​​​​​​​官方文档：​​​​​​​Query methods :: Spring Data Elasticsearch