ElasticSearch：项目实战（1）

es环境搭建参考：ElasticSearch：环境搭建步骤_Success___的博客-CSDN博客

需求：

• 用户输入关键可搜索文章列表

• 关键词高亮显示

• 文章列表展示与home展示一样，当用户点击某一篇文章，可查看文章详情

思路：

为了加快检索的效率，在查询的时候不会直接从数据库中查询文章，需要在elasticsearch中进行高速检索。

1、使用postman往虚拟机es中创建索引和映射

put请求 ： http://192.168.200.130:9200/app_info_article

{
    "mappings":{
        "properties":{
            "id":{
                "type":"long"
            },
            "publishTime":{
                "type":"date"
            },
            "layout":{
                "type":"integer"
            },
            "images":{
                "type":"keyword",
                "index": false
            },
            "staticUrl":{
                "type":"keyword",
                "index": false
            },
            "authorId": {
                "type": "long"
            },
            "authorName": {
                "type": "text"
            },
            "title":{
                "type":"text",
                "analyzer":"ik_smart"
            },
            "content":{
                "type":"text",
                "analyzer":"ik_smart"
            }
        }
    }
}

下图为例添加成功

GET请求查询映射：http://192.168.200.130:9200/app_info_article

DELETE请求，删除索引及映射：http://192.168.200.130:9200/app_info_article

GET请求，查询所有文档：http://192.168.200.130:9200/app_info_article/_search

2、将数据从数据库导入到ES索引库中

①创建es-init工程，pom文件如下

    <dependencies>
        <!-- 引入依赖模块 -->
        <dependency>
            <groupId>com.heima</groupId>
            <artifactId>heima-leadnews-common</artifactId>
        </dependency>

        <!-- Spring boot starter -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--elasticsearch-->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-client</artifactId>
            <version>7.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <!-- web项目可以不排除下面的依赖 -->
            <exclusions>
                <exclusion>
                    <groupId>com.google.guava</groupId>
                    <artifactId>guava</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-core</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.dataformat</groupId>
                    <artifactId>jackson-dataformat-smile</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.dataformat</groupId>
                    <artifactId>jackson-dataformat-yaml</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-databind</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.dataformat</groupId>
                    <artifactId>jackson-dataformat-cbor</artifactId>
                </exclusion>
            </exclusions>
            <version>7.4.0</version>
        </dependency>

        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.15.4</version>
        </dependency>

    </dependencies>

②配置application.yml文件

server:
  port: 9999
spring:
  application:
    name: es-article

  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/leadnews_article?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
    username: root
    password: 1234
# 设置Mapper接口所对应的XML文件位置，如果你在Mapper接口中有自定义方法，需要进行该配置
mybatis-plus:
  mapper-locations: classpath*:mapper/*.xml
  # 设置别名包扫描路径，通过该属性可以给包中的类注册别名
  type-aliases-package: com.heima.model.common.article.model.po


#自定义elasticsearch连接配置
elasticsearch:
  host: 192.168.200.130
  port: 9200

③在工程config中创建配置类ElasticSearchConfig用来操作es

package com.heima.es.config;

import lombok.Getter;
import lombok.Setter;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Getter
@Setter
@Configuration
@ConfigurationProperties(prefix = "elasticsearch")
public class ElasticSearchConfig {
    private String host;
    private int port;

    @Bean
    public RestHighLevelClient client(){
        return new RestHighLevelClient(RestClient.builder(
                new HttpHost(
                        host,
                        port,
                        "http"
                )
        ));
    }
}

④在工程pojo中创建实体类SearchArticleVo

需要存储到es索引库中的字段

package com.heima.es.pojo;

import lombok.Data;
import java.util.Date;

@Data
public class SearchArticleVo {

    // 文章id
    private Long id;
    // 文章标题
    private String title;
    // 文章发布时间
    private Date publishTime;
    // 文章布局
    private Integer layout;
    // 封面
    private String images;
    // 作者id
    private Long authorId;
    // 作者名词
    private String authorName;
    //静态url
    private String staticUrl;
    //文章内容
    private String content;

}

⑤在工程mapper中创建方法用来查询对应的数据库字段

package com.heima.es.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.heima.es.pojo.SearchArticleVo;
import com.heima.model.common.article.model.po.ApArticle;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface ApArticleMapper extends BaseMapper<ApArticle> {

    List<SearchArticleVo> loadArticleList();

}

⑥创建mapper.xml动态sql文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.heima.es.mapper.ApArticleMapper">

    <resultMap id="resultMap" type="com.heima.es.pojo.SearchArticleVo">
        <id column="id" property="id"/>
        <result column="title" property="title"/>
        <result column="author_id" property="authorId"/>
        <result column="author_name" property="authorName"/>
        <result column="layout" property="layout"/>
        <result column="images" property="images"/>
        <result column="publish_time" property="publishTime"/>
        <result column="static_url" property="staticUrl"/>
        <result column="content" property="content"/>
    </resultMap>
    <select id="loadArticleList" resultMap="resultMap">
        SELECT
            aa.*, aacon.content
        FROM
            `ap_article` aa,
            ap_article_config aac,
            ap_article_content aacon
        WHERE
            aa.id = aac.article_id
          AND aa.id = aacon.article_id
          AND aac.is_delete != 1
          AND aac.is_down != 1

    </select>

</mapper>

⑦创建test类并执行数据导入代码

package com.heima.es;

import com.alibaba.fastjson.JSON;
import com.heima.es.mapper.ApArticleMapper;
import com.heima.es.pojo.SearchArticleVo;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

@SpringBootTest
@RunWith(SpringRunner.class)
public class ApArticleTest {

    @Autowired
    private ApArticleMapper apArticleMapper;

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    /**
     * 注意：数据量的导入，如果数据量过大，需要分页导入
     * @throws Exception
     */
    @Test
    public void init() throws Exception {
        /*查询符合条件的文章数据*/
        List<SearchArticleVo> searchArticleVos = apArticleMapper.loadArticleList();


        /*批量导入es数据*/
        //索引库名称
        BulkRequest bulkRequest = new BulkRequest("app_info_article");
        for (SearchArticleVo searchArticleVo : searchArticleVos) {
            IndexRequest indexRequest =
                    new IndexRequest()
                            .id(searchArticleVo.getId().toString())
                            .source(JSON.toJSONString(searchArticleVo), XContentType.JSON);
            bulkRequest.add(indexRequest);
        }
        restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
    }

}

⑧使用postman请求查看数据

导入成功

3**、文章搜索功能实现**

①创建heima-leadnews-search搜索工程

pom文件内容如下

        <!--elasticsearch-->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-client</artifactId>
            <version>7.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <!-- web项目可以不排除下面的依赖 -->
            <exclusions>
                <exclusion>
                    <groupId>com.google.guava</groupId>
                    <artifactId>guava</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-core</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.dataformat</groupId>
                    <artifactId>jackson-dataformat-smile</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.dataformat</groupId>
                    <artifactId>jackson-dataformat-yaml</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-databind</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.dataformat</groupId>
                    <artifactId>jackson-dataformat-cbor</artifactId>
                </exclusion>
            </exclusions>
            <version>7.4.0</version>
        </dependency>

②配置nacos

server:
  port: 51804
spring:
  application:
    name: leadnews-search
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.200.130:8848
      config:
        server-addr: 192.168.200.130:8848
        file-extension: yml

③nacos中配置elasticsearch

spring:
  autoconfigure:
    exclude: org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration
elasticsearch:
  host: 192.168.200.130
  port: 9200

④创建controller

package com.heima.search.controller.v1;

import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.search.UserSearchDto;
import com.heima.search.service.ArticleSearchService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;

@RestController
@RequestMapping("/api/v1/article/search")
public class ArticleSearchController {

    @Autowired
    ArticleSearchService articleSearchService;

    @PostMapping("/search")
    public ResponseResult search(@RequestBody UserSearchDto dto) throws IOException {
        return articleSearchService.search(dto);
    }

}

⑤实现service层

package com.heima.search.service.impl;

import com.alibaba.cloud.commons.lang.StringUtils;
import com.alibaba.fastjson.JSON;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.common.search.UserSearchDto;
import com.heima.search.service.ArticleSearchService;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ArticleSearchServiceImpl implements ArticleSearchService {

    @Autowired
    RestHighLevelClient restHighLevelClient;

   /*文章搜索*/
    @Override
    public ResponseResult search(UserSearchDto dto) throws IOException {
        //参数校验
        System.out.println(dto);
        //1.检查参数
        if(dto == null || StringUtils.isBlank(dto.getSearchWords())){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //2.设置查询条件
        SearchRequest searchRequest = new SearchRequest("app_info_article");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        //布尔查询
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

        //关键字的分词之后查询
        QueryStringQueryBuilder queryStringQueryBuilder = QueryBuilders.queryStringQuery(dto.getSearchWords()).field("title").field("content").defaultOperator(Operator.OR);
        boolQueryBuilder.must(queryStringQueryBuilder);

        //查询小于mindate的数据
//        RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("publishTime").lt(dto.getMinBehotTime().getTime());
//        boolQueryBuilder.filter(rangeQueryBuilder);

        //分页查询
        searchSourceBuilder.from(0);
        searchSourceBuilder.size(dto.getPageSize());

        //按照发布时间倒序查询
        searchSourceBuilder.sort("publishTime", SortOrder.DESC);

        //设置高亮  title
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.preTags("<font style='color: red; font-size: inherit;'>");
        highlightBuilder.postTags("</font>");
        searchSourceBuilder.highlighter(highlightBuilder);


        searchSourceBuilder.query(boolQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);


        //3.结果封装返回

        List<Map> list = new ArrayList<>();

        SearchHit[] hits = searchResponse.getHits().getHits();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            Map map = JSON.parseObject(json, Map.class);
            //处理高亮
            if(hit.getHighlightFields() != null && hit.getHighlightFields().size() > 0){
                Text[] titles = hit.getHighlightFields().get("title").getFragments();
                String title = org.apache.commons.lang.StringUtils.join(titles);
                //高亮标题
                map.put("h_title",title);
            }else {
                //原始标题
                map.put("h_title",map.get("title"));
            }
            list.add(map);
        }
        System.out.println(list);
        return ResponseResult.okResult(list);
    }

}

⑥在gateway网关中配置当前项目

        #搜索微服务
        - id: leadnews-search
          uri: lb://leadnews-search
          predicates:
            - Path=/search/**
          filters:
            - StripPrefix= 1

⑦启动项目并测试

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