Elasticsearch 集成---框架集成SpringData-集成测试-索引操作

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 JPAElasticsearch„)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 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 Elasticsearch7.6.2Spring 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
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 {
    @Id
    private 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 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 TransportClientTransportClient 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
    @Override
    public 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 {
    @Id
    private 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 {
    @Autowired
    private ElasticsearchRestTemplate elasticsearchRestTemplate;

    //创建索引并增加映射配置
    @Test
    public void createIndex(){
        System.out.println("创建索引");
    }

    @Test
    public 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 {
    @Autowired
    private ProductDao productDao;
    /**
     * 新增
     */
    @Test
    public 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
    @Test
    public 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
    @Test
    public void findById(){
        Product product = productDao.findById(2L).get();
        System.out.println(product);
    }
    //查询所有

    @Test
    public void findAll(){
        Iterable<Product> products = productDao.findAll();
        for (Product product : products) {
            System.out.println(product);
        }
    }
    //删除
    @Test
    public void delete(){
        Product product = new Product();
        product.setId(1L);
        productDao.delete(product);
    }
    //批量新增
    @Test
    public 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
    @Test
    public 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 {
    @Autowired
    private ProductDao productDao;
    /**
     * term 查询
     * search(termQueryBuilder) 调用搜索方法,参数查询构建器对象
     */
    @Test
    public 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
     */
    @Test
    public 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);
        }
    }
}

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