Elasticsearch 集成---框架集成SpringData-集成测试-索引操作-编程知识

1.Spring Data 框架介绍

Spring Data 是一个用于简化数据库、非关系型数据库、索引库访问，并支持云服务的

开源框架。其主要目标是使得对数据的访问变得方便快捷，并支持 map-reduce 框架和云计

算数据服务。 Spring Data 可以极大的简化 JPA （ Elasticsearch „）的写法，可以在几乎不用

写实现的情况下，实现对数据的访问和操作。除了 CRUD 外，还包括如分页、排序等一些

常用的功能。

Spring Data 的官网： https://spring.io/projects/spring-data

Spring Data 常用的功能模块如下：

2.Spring Data Elasticsearch 介绍

Spring Data Elasticsearch 基于 spring data API 简化 Elasticsearch 操作，将原始操作

Elasticsearch 的客户端 API 进行封装。 Spring Data 为 Elasticsearch 项目提供集成搜索引擎。

Spring Data Elasticsearch POJO 的关键功能区域为中心的模型与 Elastichsearch 交互文档和轻

松地编写一个存储索引库数据访问层。

官方网站 : https://spring.io/projects/spring-data-elasticsearch

3.Spring Data Elasticsearch 版本对比

目前最新 springboot 对应 Elasticsearch7.6.2，Spring boot2.3.x 一般可以兼容 Elasticsearch7.x

4.框架集成

1. 创建 Maven 项目

2. 修改 pom 文件，增加依赖关系

<?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><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.6.RELEASE</version><relativePath/></parent><groupId>com.atguigu.es</groupId><artifactId>springdata-elasticsearch</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target></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-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-test</artifactId></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId></dependency></dependencies>
</project>

3.增加配置文件

在 resources 目录中增加 application.properties 文件

# es服务地址
elasticsearch.host=127.0.0.1
# es服务端口
elasticsearch.port=9200
# 配置日志级别,开启debug日志
logging.level.com.atguigu.es=debug

4. SpringBoot 主程序

package es;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringDataElasticSearchMainApplication {public static void main(String[] args) {SpringApplication.run(SpringDataElasticSearchMainApplication.class,args);}
}

5. 数据实体类

package es;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;@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Document(indexName = "product", shards = 3, replicas = 1)
public class Product {@Idprivate Long id;//商品唯一标识@Field(type = FieldType.Text)private String title;//商品名称@Field(type = FieldType.Keyword)private String category;//分类名称@Field(type = FieldType.Double)private Double price;//商品价格@Field(type = FieldType.Keyword, index = false)private String images;//图片地址
}

6. 配置类

ElasticsearchRestTemplate 是 spring-data-elasticsearch 项目中的一个类，和其他 spring 项目中的 template 类似。
在新版的 spring-data-elasticsearch 中，ElasticsearchRestTemplate 代替了原来的 ElasticsearchTemplate。
原因是 ElasticsearchTemplate 基于 TransportClient，TransportClient 即将在 8.x 以后的版本中移除。所以，我们推荐使用 ElasticsearchRestTemplate。
ElasticsearchRestTemplate 基于 RestHighLevelClient 客户端的。需要自定义配置类，继承
AbstractElasticsearchConfiguration，并实现 elasticsearchClient()抽象方法，创建 RestHighLevelClient 对象。

package es;import lombok.Data;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.config.AbstractElasticsearchConfiguration;@ConfigurationProperties(prefix = "elasticsearch")
@Configuration
@Data
public class ElasticsearchConfig extends AbstractElasticsearchConfiguration {private String host ;private Integer port ;//重写父类方法@Overridepublic RestHighLevelClient elasticsearchClient() {RestClientBuilder builder = RestClient.builder(new HttpHost(host, port));RestHighLevelClient restHighLevelClient = new RestHighLevelClient(builder);return restHighLevelClient;}
}

7. DAO 数据访问对象

package es;import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;@Repository
public interface ProductDao extends ElasticsearchRepository<Product,Long> {
}

8. 实体类映射操作

package es;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;@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Document(indexName = "product", shards = 3, replicas = 1)
public class Product {@Idprivate Long id;//商品唯一标识@Field(type = FieldType.Text)private String title;//商品名称@Field(type = FieldType.Keyword)private String category;//分类名称@Field(type = FieldType.Double)private Double price;//商品价格@Field(type = FieldType.Keyword, index = false)private String images;//图片地址
}

9. 索引操作

package es;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.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringDataESIndexTest {@Autowiredprivate ElasticsearchRestTemplate elasticsearchRestTemplate;//创建索引并增加映射配置@Testpublic void createIndex(){System.out.println("创建索引");}@Testpublic void deleteIndex(){//创建索引，系统初始化会自动创建索引boolean flg = elasticsearchRestTemplate.deleteIndex(Product.class);System.out.println("删除索引 = " + flg);}
}

10. 文档操作

package es;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.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringDataESProductDaoTest {@Autowiredprivate ProductDao productDao;/*** 新增*/@Testpublic void save(){Product product = new Product();product.setId(2L);product.setTitle("华为2手机");product.setCategory("手机");product.setPrice(2999.0);product.setImages("http://www.atguigu/hw.jpg");productDao.save(product);}//修改@Testpublic void update(){Product product = new Product();product.setId(2L);product.setTitle("小米 2 手机");product.setCategory("手机");product.setPrice(9999.0);product.setImages("http://www.atguigu/xm.jpg");productDao.save(product);}//根据 id 查询@Testpublic void findById(){Product product = productDao.findById(2L).get();System.out.println(product);}//查询所有@Testpublic void findAll(){Iterable<Product> products = productDao.findAll();for (Product product : products) {System.out.println(product);}}//删除@Testpublic void delete(){Product product = new Product();product.setId(1L);productDao.delete(product);}//批量新增@Testpublic void saveAll(){List<Product> productList = new ArrayList<>();for (int i = 0; i < 10; i++) {Product product = new Product();product.setId(Long.valueOf(i));product.setTitle("["+i+"]红米手机");product.setCategory("手机");product.setPrice(1999.0+i);product.setImages("http://www.atguigu/xm.jpg");productList.add(product);}productDao.saveAll(productList);}//分页查询@Testpublic void findByPageable(){//设置排序(排序方式，正序还是倒序，排序的 id)Sort sort = Sort.by(Sort.Direction.ASC,"id");int currentPage=0;//当前页，第一页从 0 开始，1 表示第二页int pageSize = 5;//每页显示多少条//设置查询分页PageRequest pageRequest = PageRequest.of(currentPage, pageSize,sort);//分页查询Page<Product> productPage = productDao.findAll(pageRequest);for (Product Product : productPage.getContent()) {System.out.println(Product);}}
}

11.文档搜索

package es;import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
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.data.domain.PageRequest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)@SpringBootTest
public class SpringDataESSearchTest {@Autowiredprivate ProductDao productDao;/*** term 查询* search(termQueryBuilder) 调用搜索方法，参数查询构建器对象*/@Testpublic void termQuery(){TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("category", "手机");Iterable<Product> products = productDao.search(termQueryBuilder);for (Product product : products) {System.out.println(product);}}/*** term 查询加分页*/@Testpublic void termQueryByPage(){int currentPage= 0 ;int pageSize = 5;//设置查询分页PageRequest pageRequest = PageRequest.of(currentPage, pageSize);TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("category", "手机");Iterable<Product> products =productDao.search(termQueryBuilder,pageRequest);for (Product product : products) {System.out.println(product);}}
}

整体界面