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
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
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。
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); } }
lasticsearchTemplate是自动配置的
5. 演示
6. 工程结构
7. 参考
