springboot 整合Elasticsearch7.6.2

版本对应

本次整合的elasticsearch版本为7.6.2，对应springboot版本号为2.3.3

pom文件

pom.xml

<?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>2.3.3.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.sunyuqi</groupId>
	<artifactId>springboot-elasticsearch</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot-elasticsearch</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>9</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.elasticsearch.client</groupId>
			<artifactId>elasticsearch-rest-high-level-client</artifactId>
			<version>7.6.2</version>
		</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-web</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>

application.yml

spring: 
	elasticsearch:
		rest.uris: http://127.0.0.1:9200

实体类

package com.sunyuqi.es.entity;

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;

//索引库名为index_name，类型为article，分片为5，每片备份1片
@Document(indexName = "index_name", type = "article",shards = 5,replicas = 1)
public class Article {
    
    
    @Id
    @Field(type = FieldType.Long, store = true)
    private long id;
    @Field(type = FieldType.Text, store = true, analyzer = "ik_smart")
    private String title;
    @Field(type = FieldType.Text, store = true, analyzer = "ik_smart")
    private String content;

    public long getId() {
    
    
        return id;
    }

    public void setId(long id) {
    
    
        this.id = id;
    }

    public String getTitle() {
    
    
        return title;
    }

    public void setTitle(String title) {
    
    
        this.title = title;
    }

    public String getContent() {
    
    
        return content;
    }

    public void setContent(String content) {
    
    
        this.content = content;
    }

    @Override
    public String toString() {
    
    
        return "Article{" +
                "id=" + id +
                ", title='" + title + '\'' +
                ", content='" + content + '\'' +
                '}';
    }
}

ElasticsearchRepository接口

自定义接口需要继承ElasticsearchRepository接口，接口方法命名规则类似spring data jpa，无需实现具体接口方法

package com.sunyuqi.es.repositories;


import com.sunyuqi.es.entity.Article;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;

import java.util.List;

public interface ArticleRepository extends ElasticsearchRepository<Article, Long> {
    
    
    List<Article> findByTitle(String title);
    List<Article> findByContent(String content);
    List<Article> findByTitleOrContent(String title, String content);
    List<Article> findByTitleOrContent(String title, String content, Pageable pageable);

}

springboot引导类

package com.sunyuqi;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootElasticsearchApplication {
    
    

	public static void main(String[] args) {
    
    
		SpringApplication.run(SpringbootElasticsearchApplication.class, args);
	}

}

测试类

package com.sunyuqi;

import com.sunyuqi.es.entity.Article;
import com.sunyuqi.es.repositories.ArticleRepository;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.aggregations.metrics.ParsedAvg;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
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.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.data.elasticsearch.core.SearchHit;
import org.springframework.data.elasticsearch.core.SearchHits;
import org.springframework.data.elasticsearch.core.query.NativeSearchQuery;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootElasticsearchApplication.class)
class SpringbootElasticsearchApplicationTests {
    
    

	@Autowired
	private ArticleRepository articleRepository;

	@Autowired
	private ElasticsearchRestTemplate template;

	//添加文档
	@Test
	public void addDocument() throws Exception {
    
    
		for (int i = 0; i <= 20; i++) {
    
    
			//创建一个Article对象
			Article article = new Article();
			article.setId(i);
			article.setTitle("测试的标题" + i);
			article.setContent("测试的内容"+i);
			//把文档写入索引库
			articleRepository.save(article);
		}
	}

	@Test
	public void deleteDocumentById() throws Exception {
    
    
		articleRepository.deleteById(1l);
		//全部删除
//		articleRepository.deleteAll();
	}

	//查询所有文档
	@Test
	public void findAll() throws Exception {
    
    
		Iterable<Article> articles = articleRepository.findAll();
        for (Article article : articles) {
    
    
            System.out.println(article);
        }
    }
    //根据ID查询
	@Test
	public void testFindById() throws Exception {
    
    
		Article article = template.get("14", Article.class);
		System.out.println(article);
	}
	//匹配标题，精准匹配
	@Test
	public void testFindByTitle() throws Exception {
    
    
		List<Article> list = articleRepository.findByTitle("标题");
		for (Article article : list) {
    
    
			System.out.println(article);
		}
	}
	//匹配标题或者内容
	@Test
	public void testFindByTitleOrContent() throws Exception {
    
    
		Pageable pageable = PageRequest.of(1, 5);
		List<Article> articles = articleRepository.findByTitleOrContent("maven", "内容", pageable);
		for (Article article : articles) {
    
    
			System.out.println(article);
		}
	}

	//分词查询
	@Test
	public void testNativeSearchQuery() throws Exception {
    
    
		//创建一个查询对象
		NativeSearchQuery query = new NativeSearchQueryBuilder()
				.withQuery(QueryBuilders.queryStringQuery("内容包含").defaultField("content"))
				.withPageable(PageRequest.of(0, 15))
				.build();
		//执行查询
		SearchHits<Article> search = template.search(query, Article.class);
		List<SearchHit<Article>> searchHits = search.getSearchHits();
		for (SearchHit<Article> searchHit : searchHits) {
    
    
			System.out.println(searchHit.getContent());
		}

		//获取聚合结果
		if (search.hasAggregations()) {
    
    
			ParsedAvg parsedAvg = search.getAggregations().get("avg_price");
			Assertions.assertNotNull(parsedAvg, "无聚合结果");
			System.out.println(parsedAvg.getValue());
		}
	}
}

添加文档时如果索引库不存在则会自动创建