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作者:废物大师兄

cnblogs.com/cjsblog/p/9756978.html

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

201910131002\_1.png


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

201910131002\_2.png


4. 操作

4.1. 使用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,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。

201910131002\_3.png

    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,还有分页查询

最后,写一个测试类测试其中的方法

    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,便是使用Elasticsearch Repositories的方式

4.2. 使用ElasticsearchTemplate方式操作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是自动配置的

201910131002\_4.png


5. 演示

201910131002\_5.png


6. 工程结构

201910131002\_6.png


7. 参考

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

- END -


来源:https://cloud.tencent.com/developer/column/2205/tag-10712

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