SpringBoot 集成 Elasticsearch 实战

1. 前言

1.1. 集成方式

Spring Boot 中集成 Elasticsearch 有 4 种方式：

• REST Client

• Jest

• Spring Data

• Spring Data Elasticsearch Repositories

本文用后面两种方式来分别连接并操作 Elasticsearch

1.2. 环境与配置

服务端：elasticsearch-6.3.2 1 台

客户端：elasticsearch 6.4.1

服务端配置文件：elasticsearch.yml

cluster.name: my-application
network.host: 192.168.1.134
http.port: 9200

/etc/security/limits.conf

cheng soft nofile 65536
cheng hard nofile 65536

/etc/sysctl.conf

vm.max_map_count=262144

1.3. 版本

Spring Boot 2.0.5 默认的 elasticsearch 版本很低，这里我们用最新版本 6.4.1

如果启动过程中出现

java.lang.NoClassDefFoundError: org/elasticsearch/common/transport/InetSocketTransportAddress

则说明，elasticsearch 依赖的 jar 包版本不一致，统一改成 6.4.1 即可

另外，Spring Boot 2.0.5 依赖的 spring-data-elasticsearch 版本是 3.0.1，需要升级到 3.1.0

2.0.5 依赖

2. 依赖

<?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>

    <groupId>com.cjs.example</groupId>
    <artifactId>cjs-elasticsearch-example</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>cjs-elasticsearch-example</name>
    <description></description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>

        <elasticsearch.version>6.4.1</elasticsearch.version>
        <spring.data.elasticsearch.version>3.1.0.RELEASE</spring.data.elasticsearch.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-client</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.plugin</groupId>
            <artifactId>transport-netty4-client</artifactId>
            <version>${elasticsearch.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-elasticsearch</artifactId>
            <version>${spring.data.elasticsearch.version}</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.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>
    </dependencies>

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

</project>

3. application.properties

spring.data.elasticsearch.cluster-name=my-application
spring.data.elasticsearch.cluster-nodes=192.168.1.134:9300

也许，大家会疑惑，配置文件中明明写的端口是 9200，为何这里配置文件中连接的时候写的端口是 9300 呢？

因为，配置 9200 是通过 HTTP 连接的端口，9300 是 TCP 连接的端口

cmd

4. 操作

4.1. 使用 Spring Data Elasticsearch Repositories 操作 Elasticsearch

首先，定义一个实体类

import lombok.Data;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;

import java.io.Serializable;

@Data
@Document(indexName = "commodity")
public class Commodity implements Serializable {

    @Id
    private String skuId;

    private String name;

    private String category;

    private Integer price;

    private String brand;

    private Integer stock;

}

这里定义了 Commodity 实例，表示商品。在 Elasticsearch 6.X 版本中，不建议使用 type，而且在 7.X 版本中将会彻底废弃 type，所以此处我只指定了 indexName，没有指定 type。这里，一个 Commodity 代表一个商品，同时代表一条索引记录。

类比关系型数据库的话，Index 相当于表，Document 相当于记录

然后，需要自己定义一个接口，并继承 ElasticsearchRepository

类继承图

import com.cjs.example.entity.Commodity;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface CommodityRepository extends ElasticsearchRepository<Commodity, String> {

}

这里的 Repository 相当于 DAO，操作 mysql 还是 elasticsearch 都是一样的

接下来，定义 service 接口

import com.cjs.example.entity.Commodity;
import org.springframework.data.domain.Page;

import java.util.List;

public interface CommodityService {

    long count();

    Commodity save(Commodity commodity);

    void delete(Commodity commodity);

    Iterable<Commodity> getAll();

    List<Commodity> getByName(String name);

    Page<Commodity> pageQuery(Integer pageNo, Integer pageSize, String kw);

}

实现类

import com.cjs.example.entity.Commodity;
import com.cjs.example.dao.CommodityRepository;
import com.cjs.example.service.CommodityService;
import org.elasticsearch.index.query.MatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.data.elasticsearch.core.query.SearchQuery;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class CommodityServiceImpl implements CommodityService {

    @Autowired
    private CommodityRepository commodityRepository;


    @Override
    public long count() {
        return commodityRepository.count();
    }

    @Override
    public Commodity save(Commodity commodity) {
        return commodityRepository.save(commodity);
    }

    @Override
    public void delete(Commodity commodity) {
        commodityRepository.delete(commodity);
//        commodityRepository.deleteById(commodity.getSkuId());
    }

    @Override
    public Iterable<Commodity> getAll() {
        return commodityRepository.findAll();
    }

    @Override
    public List<Commodity> getByName(String name) {
        List<Commodity> list = new ArrayList<>();
        MatchQueryBuilder matchQueryBuilder = new MatchQueryBuilder("name", name);
        Iterable<Commodity> iterable = commodityRepository.search(matchQueryBuilder);
        iterable.forEach(e->list.add(e));
        return list;
    }

    @Override
    public Page<Commodity> pageQuery(Integer pageNo, Integer pageSize, String kw) {
        SearchQuery searchQuery = new NativeSearchQueryBuilder()
                .withQuery(QueryBuilders.matchPhraseQuery("name", kw))
                .withPageable(PageRequest.of(pageNo, pageSize))
                .build();
        return commodityRepository.search(searchQuery);
    }
}

在这个 Service 中演示了增删查改操作，还有分页查询

最后，写一个测试类测试其中的方法

import com.cjs.example.entity.Commodity;
import com.cjs.example.service.CommodityService;
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.test.context.junit4.SpringRunner;

import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
public class CjsElasticsearchExampleApplicationTests {

    @Autowired
    private CommodityService commodityService;

    @Test
    public void contextLoads() {
        System.out.println(commodityService.count());
    }

    @Test
    public void testInsert() {
        Commodity commodity = new Commodity();
        commodity.setSkuId("1501009001");
        commodity.setName("原味切片面包（10片装）");
        commodity.setCategory("101");
        commodity.setPrice(880);
        commodity.setBrand("良品铺子");
        commodityService.save(commodity);

        commodity = new Commodity();
        commodity.setSkuId("1501009002");
        commodity.setName("原味切片面包（6片装）");
        commodity.setCategory("101");
        commodity.setPrice(680);
        commodity.setBrand("良品铺子");
        commodityService.save(commodity);

        commodity = new Commodity();
        commodity.setSkuId("1501009004");
        commodity.setName("元气吐司850g");
        commodity.setCategory("101");
        commodity.setPrice(120);
        commodity.setBrand("百草味");
        commodityService.save(commodity);

    }

    @Test
    public void testDelete() {
        Commodity commodity = new Commodity();
        commodity.setSkuId("1501009002");
        commodityService.delete(commodity);
    }

    @Test
    public void testGetAll() {
        Iterable<Commodity> iterable = commodityService.getAll();
        iterable.forEach(e->System.out.println(e.toString()));
    }

    @Test
    public void testGetByName() {
        List<Commodity> list = commodityService.getByName("面包");
        System.out.println(list);
    }

    @Test
    public void testPage() {
        Page<Commodity> page = commodityService.pageQuery(0, 10, "切片");
        System.out.println(page.getTotalPages());
        System.out.println(page.getNumber());
        System.out.println(page.getContent());
    }
}

以上，便是使用 Elasticsearch Repositories 的方式

4.2. 使用 ElasticsearchTemplate 方式操作 Elasticsearch

import com.cjs.example.entity.Commodity;
import org.elasticsearch.index.query.QueryBuilders;
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.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.query.*;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
public class ElasticsearchTemplateTest {

    @Autowired
    public ElasticsearchTemplate elasticsearchTemplate;

    @Test
    public void testInsert() {
        Commodity commodity = new Commodity();
        commodity.setSkuId("1501009005");
        commodity.setName("葡萄吐司面包（10片装）");
        commodity.setCategory("101");
        commodity.setPrice(160);
        commodity.setBrand("良品铺子");

        IndexQuery indexQuery = new IndexQueryBuilder().withObject(commodity).build();
        elasticsearchTemplate.index(indexQuery);
    }

    @Test
    public void testQuery() {
        SearchQuery searchQuery = new NativeSearchQueryBuilder()
                .withQuery(QueryBuilders.matchQuery("name", "吐司"))
                .build();
        List<Commodity> list = elasticsearchTemplate.queryForList(searchQuery, Commodity.class);
        System.out.println(list);
    }

}

ElasticsearchTemplate 是自动配置的

ElasticsearchTemplate 自动配置

---

5. 演示

演示

演示

6. 工程结构

工程结构

7. 参考

https://docs.spring.io/spring-data/elasticsearch/docs/3.1.0.RELEASE/reference/html/#repositories.query-methods.details

作者 | 废物大师兄

来源 | cnblogs.com/cjsblog/p/9756978.html

   
   
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