springboot2.2+整合elasticsearch 7.x

1.导入依赖

 <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf.extras</groupId>
            <artifactId>thymeleaf-extras-springsecurity5</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.59</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

2.进行环境配置

1.application.properties

# ServerProperties
server.port=8080
server.servlet.context-path=/es

# ThymeleafProperties
spring.thymeleaf.cache=false

# DataSourceProperties
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/es?characterEncoding=utf-8&useSSL=false&serverTimezone=Hongkong
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.hikari.maximum-pool-size=15
spring.datasource.hikari.minimum-idle=5
spring.datasource.hikari.idle-timeout=30000

# MybatisProperties
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=com.boot.es.pojo
mybatis.configuration.useGeneratedKeys=true
mybatis.configuration.mapUnderscoreToCamelCase=true

# ElasticsearchProperties
# spring.data.elasticsearch.cluster-name=my-application
# spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300
elasticSearch.url=101.35.83.200:9200

2.config 配置

package com.boot.es.config;

import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.client.ClientConfiguration;
import org.springframework.data.elasticsearch.client.RestClients;

@Configuration
public class  EsConfig{
    @Value("${elasticSearch.url}")
    private String esUrl;

    //localhost:9200 写在配置文件中就可以了 配置es客户端
    @Bean
    RestHighLevelClient client() {
        ClientConfiguration clientConfiguration = ClientConfiguration.builder()
                .connectedTo(esUrl)//elasticsearch地址
                .build();

        return RestClients.create(clientConfiguration).rest();
    }
}

3 继承ElasticsearchRepository 成springBean

package com.nowcoder.community.dao.elasticsearch;

import com.nowcoder.community.entity.DiscussPost;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;

/*
ElasticsearchRepository<DiscussPost, Integer>
DiscussPost：接口要处理的实体类
Integer：实体类中的主键是什么类型
ElasticsearchRepository：父接口，其中已经事先定义好了对es服务器访问的增删改查各种方法。Spring会给它自动做一个实现，我们直接去调就可以了。
 */
@Repository
public interface DiscussPostRepository extends ElasticsearchRepository<DiscussPost, Integer> {

}

4.实体类以及数据库操作

4.1 实体映射

package com.boot.es.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;

import java.util.Date;

@Data
@AllArgsConstructor
@NoArgsConstructor
@Document(indexName = "elastic-test", /*type = "_doc",*/ shards = 6, replicas = 3)
public class DiscussPost {

    @Id
    private int id;

    @Field(type = FieldType.Integer)
    private int userId;

    
    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String title;

    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")
    private String content;

    @Field(type = FieldType.Integer)
    private int type;

    @Field(type = FieldType.Integer)
    private int status;

    @Field(type = FieldType.Date)
    private Date createTime;

    @Field(type = FieldType.Integer)
    private int commentCount;

    @Field(type = FieldType.Double)
    private double score;
}

4.2 dao 和mapper

package com.nowcoder.community.dao;

import com.nowcoder.community.entity.DiscussPost;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;


@Mapper
@Repository
public interface DiscussPostMapper {

    List<DiscussPost> selectDiscussPosts(int userId, int offset, int limit);

    // @Param注解用于给参数取别名,
    // 如果只有一个参数,并且在<if>里使用,则必须加别名.
    int selectDiscussPostRows(@Param("userId") int userId);

    int insertDiscussPost(DiscussPost discussPost);

    DiscussPost selectDiscussPostById(int id);

    int updateCommentCount(int id, int commentCount);
}

mapper.xml

<?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.boot.es.dao.DiscussPostMapper">

    <sql id="selectFields">
        id, user_id, title, content, type, status, create_time, comment_count, score
    </sql>

    <sql id="insertFields">
        user_id, title, content, type, status, create_time, comment_count, score
    </sql>

    <select id="selectDiscussPosts" resultType="DiscussPost">
        select <include refid="selectFields"></include>
        from discuss_post
        where status != 2
        <if test="userId!=0">
            and user_id = #{userId}
        </if>
        order by type desc, create_time desc
        limit #{offset}, #{limit}
    </select>

    <select id="selectDiscussPostRows" resultType="int">
        select count(id)
        from discuss_post
        where status != 2
        <if test="userId!=0">
            and user_id = #{userId}
        </if>
    </select>

    <insert id="insertDiscussPost" parameterType="DiscussPost" keyProperty="id">
        insert into discuss_post(<include refid="insertFields"></include>)
        values(#{userId},#{title},#{content},#{type},#{status},#{createTime},#{commentCount},#{score})
    </insert>

    <select id="selectDiscussPostById" resultType="DiscussPost">
        select <include refid="selectFields"></include>
        from discuss_post
        where id = #{id}
    </select>

    <update id="updateCommentCount">
        update discuss_post set comment_count = #{commentCount} where id = #{id}
    </update>

</mapper>

4.3 数据库脚本

CREATE DATABASE /*!32312 IF NOT EXISTS*/`es` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `es`;

/*Table structure for table `discuss_post` */

DROP TABLE IF EXISTS `discuss_post`;

CREATE TABLE `discuss_post` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` varchar(45) DEFAULT NULL COMMENT '哪个用户发布的',
  `title` varchar(100) DEFAULT NULL,
  `content` text,
  `type` int(11) DEFAULT NULL COMMENT '0-普通; 1-置顶;',
  `status` int(11) DEFAULT NULL COMMENT '0-正常; 1-精华; 2-拉黑;',
  `create_time` timestamp NULL DEFAULT NULL,
  `comment_count` int(11) DEFAULT NULL,
  `score` double DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `index_user_id` (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=281 DEFAULT CHARSET=utf8;

/*Data for the table `discuss_post` */

insert  into `discuss_post`(`id`,`user_id`,`title`,`content`,`type`,`status`,`create_time`,`comment_count`,`score`) values (109,'101','因特网求职暖春计划','今年的就业形势，确实不容乐观。过了个年，仿佛跳水一般，整个讨论区哀鸿遍野！19届真的没人要了吗？！18届被优化真的没有出路了吗？！大家的“哀嚎”与“悲惨遭遇”牵动了每日潜伏于讨论区的牛客小哥哥小姐姐们的心，于是牛客决定：是时候为大家做点什么了！为了帮助大家度过“寒冬”，牛客网特别联合60+家企业，开启互联网求职暖春计划，面向18届&19届，拯救0 offer！',0,0,'2019-04-04 11:53:36',0,0),(275,'11','我是管理员','我是管理员，你们都老实点！',1,1,'2019-05-16 18:58:44',12,1751.2900346113624),(276,'149','新人报道','新人报道，请多关照！',0,0,'2019-05-17 15:50:18',6,1751.806179973984),(277,'149','Spring Cache','Spring Cache RedisCacheManager',0,0,'2019-05-17 17:06:54',38,1752.5797835966168),(280,'149','事务','事务的4个特性，包括原子性、一致性、隔离性、持久性。',0,0,'2019-05-20 17:41:30',16,1755.2095150145426);

3.api调用

package org.example;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.boot.es.App;

import com.boot.es.dao.DiscussPostMapper;
import com.boot.es.dao.DiscussPostRepository;
import com.boot.es.pojo.DiscussPost;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ContextConfiguration;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

@SpringBootTest
@ContextConfiguration(classes = App.class)
public class ElasticsearchTests {

    @Autowired
    private DiscussPostMapper discussMapper;

    @Autowired
    private DiscussPostRepository discussRepository;

    @Qualifier("client")
    @Autowired
    private RestHighLevelClient restHighLevelClient;

    //判断某id的文档（数据库中的行）是否存在
    @Test
    public void testExist(){
        boolean exists =discussRepository.existsById(1);
        System.out.println(exists);
    }

    //一次保存一条数据
    @Test
    public void testInsert() {
        //把id为241的DiscussPost的对象保存到elastic-test索引（es的索引相当于数据库的表）
        /**
         * 不能插入空数据 报错
         */
        DiscussPost save = discussRepository.save(discussMapper.selectDiscussPostById(109));
        System.out.println(save.getContent());
    }

    //一次保存多条数据
    @Test
    public void testInsertList() {
        //把id为101的用户发的前100条帖子（List<DiscussPost>）存入es的discusspost索引（es的索引相当于数据库的表）
        Iterable<DiscussPost> discussPosts = discussRepository.saveAll(discussMapper.selectDiscussPosts(149, 0, 100));
    }

    //通过覆盖原内容，来修改一条数据
    @Test
    public void testUpdate() {
        DiscussPost post = discussMapper.selectDiscussPostById(109);
        post.setContent("我是新人,使劲灌水。");
        post.setTitle(null);//es中的title会设为null
        discussRepository.save(post);
    }

    //修改一条数据
    //覆盖es里的原内容 与 修改es中的内容 的区别：String类型的title被设为null，覆盖的话，会把es里的该对象的title也设为null；UpdateRequest，修改后该对象的title不变
    @Test
    void testUpdateDocument() throws IOException{
        UpdateRequest request = new UpdateRequest("elastic-test", "109");
        request.timeout("1s");
        DiscussPost post = discussMapper.selectDiscussPostById(230);
        post.setContent("我是新人,使劲灌水.");
        post.setTitle(null);//es中的title会保存原内容不变
        request.doc(JSON.toJSONString(post), XContentType.JSON);
        UpdateResponse updateResponse = restHighLevelClient.update(request, RequestOptions.DEFAULT);
        System.out.println(updateResponse.status());
    }

    //删除一条数据和删除所有数据
    @Test
    public void testDelete() {
        //通过索引id删除
        discussRepository.deleteById(109);//删除一条数据
        //discussRepository.deleteAll();//删除所有数据
    }

    //不带高亮的查询
    @Test
    public void noHighlightQuery() throws IOException {
        SearchRequest searchRequest = new SearchRequest("elastic-test");//discusspost是索引名，就是表名

        //构建搜索条件
//        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder()
//                .query(QueryBuilders.multiMatchQuery("互联网寒冬","title","content"))
//                .sort(SortBuilders.fieldSort("type").order(SortOrder.DESC))
//                .sort(SortBuilders.fieldSort("score").order(SortOrder.DESC))
//                .sort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC))
//                .from(0)
//                .size(10);

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder()
                //在discusspost索引的title和content字段中都查询“互联网寒冬”
                .query(QueryBuilders.multiMatchQuery("新人", "title", "content"))
                // matchQuery是模糊查询，会对key进行分词：searchSourceBuilder.query(QueryBuilders.matchQuery(key,value));
                // termQuery是精准查询：searchSourceBuilder.query(QueryBuilders.termQuery(key,value));
                .sort(SortBuilders.fieldSort("type").order(SortOrder.DESC))
                .sort(SortBuilders.fieldSort("score").order(SortOrder.DESC))
                .sort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC))
                //一个可选项，用于控制允许搜索的时间：searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
                .from(0)// 指定从哪条开始查询
                .size(10);// 需要查出的总记录条数

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

        System.out.println(JSONObject.toJSON(searchResponse));

        List<DiscussPost> list = new LinkedList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            DiscussPost discussPost = JSONObject.parseObject(hit.getSourceAsString(), DiscussPost.class);
            System.out.println(discussPost);
            list.add(discussPost);
        }
    }

    //带高亮的查询
    @Test
    public void highlightQuery() throws Exception{
        SearchRequest searchRequest = new SearchRequest("elastic-test");//discusspost是索引名，就是表名

        //高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.field("content");
        highlightBuilder.requireFieldMatch(false);
        highlightBuilder.preTags("");
        highlightBuilder.postTags("");

        //构建搜索条件
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder()
                .query(QueryBuilders.multiMatchQuery("新人", "title", "content"))
                .sort(SortBuilders.fieldSort("type").order(SortOrder.DESC))
                .sort(SortBuilders.fieldSort("score").order(SortOrder.DESC))
                .sort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC))
                .from(0)// 指定从哪条开始查询
                .size(10)// 需要查出的总记录条数
                .highlighter(highlightBuilder);//高亮

        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        System.out.println(JSONObject.toJSON(searchResponse));

        List<DiscussPost> list = new LinkedList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            DiscussPost discussPost = JSONObject.parseObject(hit.getSourceAsString(), DiscussPost.class);

            // 处理高亮显示的结果
            HighlightField titleField = hit.getHighlightFields().get("title");
            if (titleField != null) {
                discussPost.setTitle(titleField.getFragments()[0].toString());
            }
            HighlightField contentField = hit.getHighlightFields().get("content");
            if (contentField != null) {
                discussPost.setContent(contentField.getFragments()[0].toString());
            }
            System.out.println(discussPost);
            list.add(discussPost);
        }
    }
}

完成springboot 整合 7.x的基本操作。