springboot整合elasticsearch

1. 在idea中新建项目，选择spring模板。

2. 选择elasticsearch依赖。

3. 项目的pom文件是这样的。

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.mujl</groupId>
    <artifactId>springelasticsearch</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springelasticsearch</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

4. application.properties文件的内容

spring.elasticsearch.uris=http://101.43.8.200:9200,http://47.104.165.141:9200,http://82.156.163.91:9200

5. javaBean类

package com.mujl.springelasticsearch.bean;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
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.io.Serializable;
import java.math.BigDecimal;

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Document(indexName = "shop",shards=5,replicas = 1,createIndex = false)
public class Goods implements Serializable {
    /**
     * 商品ID
     */
    @Id
    private Integer goodsId;

    /**
     * 商品名称
     */
    @Field(type = FieldType.Text,analyzer = "ik_max_word")
    private String goodsName;

    /**
     * 市场价
     */
    @Field(type = FieldType.Double)
    private BigDecimal marketPrice;

    /**
     * 商品上传原始图
     */
    @Field(type=FieldType.Keyword)
    private String originalImg;

    private static final long serialVersionUID = 1L;
}

javaBean内容解释

6. GoodsRepository类

package com.mujl.springelasticsearch.dao;

import com.mujl.springelasticsearch.bean.Goods;
import org.springframework.data.elasticsearch.annotations.Query;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;

import java.util.List;

public interface GoodsRepository extends ElasticsearchRepository<Goods,Integer> {

    /**
     * 根据商品名称查询商品
     * @return
     */
    List<Goods> findByGoodsName(String goodsName);

    /**
     * 根据id查询商品,自己写查询语句，问号是占位符，0是第一个
     * @param id
     * @return
     */
    @Query("{\"match\":{\"goodsId\":{\"query\":\"?0\"}}}")
    Goods findByIdValue(Integer id);
}

GoodsRepository类内容解释

7. 测试方法(//注释的方法也是可用的，只是为了测试效果注释掉了一些其他效果)

package com.mujl.springelasticsearch;

import com.mujl.springelasticsearch.bean.Goods;
import com.mujl.springelasticsearch.dao.GoodsRepository;
import lombok.val;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
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.boot.test.context.SpringBootTest;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.data.elasticsearch.core.IndexOperations;
import org.springframework.data.elasticsearch.core.SearchHit;
import org.springframework.data.elasticsearch.core.SearchHits;
import org.springframework.data.elasticsearch.core.document.Document;
import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
import org.springframework.data.elasticsearch.core.query.NativeSearchQuery;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@SpringBootTest
class SpringelasticsearchApplicationTests {

    @Autowired
    private ElasticsearchRestTemplate elasticsearchRestTemplate;

    @Autowired
    private GoodsRepository goodsRepository;

    @Test
    void contextLoads() {
    }

    @Test
    public void testIndex(){
//        //获取索引对象
        IndexOperations indexOperations = elasticsearchRestTemplate.indexOps(Goods.class);
//        //创建索引
//        indexOperations.create();
//        //获取映射,根据Goods类中的@Field注解，生成映射。
//        Document mapping = indexOperations.createMapping(Goods.class);
//        //把映射放入索引中去
//        indexOperations.putMapping(mapping);
//
//        //判断索引是否存在
//        Boolean exists = indexOperations.exists();
//        System.out.println(exists);
        //删除索引
        indexOperations.delete();
    }

    /**
     * 通过repository操作document
     */
    @Test
    public void testRepository(){
        //添加
//        List<Goods> list = new ArrayList<>();
//        list.add(new Goods(150,"测试手机1",new BigDecimal("200"),"png"));
//        list.add(new Goods(151,"测试手机2",new BigDecimal("200"),"png"));
//        goodsRepository.saveAll(list);

        //根据商品名称查询商品
//        List<Goods> goodsList = goodsRepository.findByGoodsName("%测试%");
//        goodsList.forEach(System.out::println);

        Goods goods = goodsRepository.findByIdValue(150);
        System.out.println(goods);
    }

    /**
     * 增删改
     */
    @Test
    public void testCUD(){
        List<Goods> list = new ArrayList<>();
        //添加/更新（id存在就是更新，id不存在就是添加）
        list.add(new Goods(158,"测试手机9",new BigDecimal("200"),"png"));
        list.add(new Goods(159,"测试手机10",new BigDecimal("200"),"png"));
        elasticsearchRestTemplate.save(list);

        //删除
//        elasticsearchRestTemplate.delete("150", IndexCoordinates.of("shop"));

        //删除查询出来的结果
//        NativeSearchQuery query = new NativeSearchQueryBuilder().withQuery(QueryBuilders.matchQuery("goodsName", "测试")).build();
//        elasticsearchRestTemplate.delete(query,Goods.class,IndexCoordinates.of("shop"));
    }

    /**
     * 查询
     */
    @Test
    public void testSearch(){
        NativeSearchQuery query = new NativeSearchQueryBuilder().withQuery(QueryBuilders.matchQuery("goodsName", "测试")).build();
        SearchHits<Goods> search = elasticsearchRestTemplate.search(query,Goods.class);
        search.getSearchHits().forEach(System.out::println);
    }

    /**
     * 分页，高亮，排序
     */
    @Test
    public void testSearchHigh(){
        NativeSearchQuery query = new NativeSearchQueryBuilder()
                .withQuery(QueryBuilders.multiMatchQuery("测试","goodsName"))
                //分页
//                .withPageable(PageRequest.of(0,5))
                //分页和排序写在一起
                .withPageable(PageRequest.of(0,5,Sort.Direction.DESC,"goodsId","marketPrice"))
                //排序，分数正序
//                .withSort(SortBuilders.scoreSort().order(SortOrder.ASC))
//                .withSort(SortBuilders.fieldSort("goodsId").order(SortOrder.ASC))
                //高亮，默认<em>斜体</em>
//                .withHighlightFields(new HighlightBuilder.Field("goodsName"))
                //指定样式的高亮
                .withHighlightBuilder(new HighlightBuilder().field("goodsName").preTags("<span style='color:red'>").postTags("</span>"))
                .build();
        SearchHits<Goods> searchHits = elasticsearchRestTemplate.search(query,Goods.class);
        for(SearchHit<Goods> searchHit:searchHits){
            float score = searchHit.getScore();
            String id = searchHit.getId();
            List<Object> list = searchHit.getSortValues();
            list.forEach(System.out::println);
            String goodsName = searchHit.getHighlightField("goodsName").get(0);
            Goods goods = searchHit.getContent();
            System.out.println("score:"+score);
            System.out.println("id:"+id);
//            System.out.println("sortValue:"+sortValue);
            System.out.println("goods:"+goods);
            System.out.println("goodsName高亮:"+goodsName);
            System.out.println("==============================");
        }
    }
}

SpringelasticsearchApplicationTests类的相关解释