SpringBoot+Elasticsearch

1. 前言 1.1. 集成方式 Spring Boot中集成Elasticsearch有4种方式： 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 /etc/security/limits.conf /etc/sysctl.conf 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 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

4.0.0 com.cjs.example cjs-elasticsearch-example 0.0.1-SNAPSHOT jar cjs-elasticsearch-example org.springframework.boot spring-boot-starter-parent 2.0.5.RELEASE UTF-8 UTF-8 1.8 6.4.1 3.1.0.RELEASE org.elasticsearch elasticsearch {elasticsearch.version} org.elasticsearch.client elasticsearch-rest-client {elasticsearch.version} org.springframework.data spring-data-elasticsearch ${spring.data.elasticsearch.version} org.springframework.boot spring-boot-starter-data-elasticsearch org.springframework.boot spring-boot-starter-web org.projectlombok lombok true org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-maven-plugin 3. application.properties 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 { 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 getAll(); List getByName(String name); Page 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 getAll() { return commodityRepository.findAll(); @Override public List getByName(String name) { List list = new ArrayList<>(); MatchQueryBuilder matchQueryBuilder = new MatchQueryBuilder("name", name); Iterable iterable = commodityRepository.search(matchQueryBuilder); iterable.forEach(e->list.add(e)); return list; @Override public Page 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 iterable = commodityService.getAll(); iterable.forEach(e->System.out.println(e.toString())); @Test public void testGetByName() { List list = commodityService.getByName("面包"); System.out.println(list); @Test public void testPage() { Page 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 list = elasticsearchTemplate.queryForList(searchQuery, Commodity.class); System.out.println(list); ElasticsearchTemplate是自动配置的

5. 演示

6. 工程结构

7. 参考 docs.spring.io/spring-data…

转载于:https://juejin.im/post/5bbcaaee6fb9a05cd777603b