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关于java:4种Spring-Boot中集成Elasticsearch的方法实战

jiezi

1.  前言

1.1.  集成形式

Spring Boot 中集成 Elasticsearch 有 4 种形式：

  1. REST Client
  2. Jest
  3. Spring Data
  4. Spring Data Elasticsearch Repositories

篇幅所限，本文就只用前面两种形式来别离连贯并操作 Elasticsearch，对于 spring boot 的更多学习材料能够点击我整顿的 Spring Boot 学习笔记 支付，解锁更多 spring 全家桶的骚操作玩法。😼

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，这里咱们用最新版本 6.4.1

如果启动过程中呈现

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

则阐明，elasticsearch 依赖的 jar 包版本不统一，对立改成 6.4.1 即可

另外，Spring Boot 2.0.5 依赖的 spring-data-elasticsearch 版本是 3.0.1，须要降级到 3.1.0

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

兴许，大家会纳闷，配置文件中明明写的端口是 9200，为何这里配置文件中连贯的时候写的端口是 9300 呢？

因为，配置 9200 是通过 HTTP 连贯的端口，9300 是 TCP 连贯的端口

4.  操作

4.1.  应用 Spring Data Elasticsearch Repositories 操作 Elasticsearch

首先，定义一个实体类

package com.cjs.example.entity;

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，示意商品。在 Elasticsearch 6.X 版本中，不倡议应用 type，而且在 7.X 版本中将会彻底废除 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

而后，须要本人定义一个接口，并继承 ElasticsearchRepository

package com.cjs.example.dao;

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

package com.cjs.example.service;

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

package com.cjs.example.service.impl;

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，还有分页查问

最初，写一个测试类测试其中的办法

package com.cjs.example;

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，便是应用 Elasticsearch Repositories 的形式

4.2.  应用 ElasticsearchTemplate 形式操作 Elasticsearch

package com.cjs.example;

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 是主动配置的

5.  演示

6. 工程构造

 

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