SpringBoot+Elasticsearch-创新互联

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
   
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
   http://maven.apache.org/xsd/maven-4.0.0.xsd">
   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
   transport
   ${elasticsearch.version}
   
   
   org.elasticsearch.client
   elasticsearch-rest-client
   ${elasticsearch.version}
   
   
   org.elasticsearch.plugin
   transport-netty4-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
   br/>@Data
   public class Commodity implements Serializable {@Id
   br/>@Id
   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
   br/>@Repository
   {
   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
   br/>@Service
   br/>@Autowired
   br/>@Override
   return commodityRepository.count();@Override
   br/>@Override
   return commodityRepository.save(commodity);@Override
   br/>@Override
   commodityRepository.delete(commodity);
   // commodityRepository.deleteById(commodity.getSkuId());@Override
   br/>@Override
   getAll() {
   return commodityRepository.findAll();@Override
   br/>@Override
   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
   br/>@Override
   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)
   br/>@RunWith(SpringRunner.class)
   public class CjsElasticsearchExampleApplicationTests {@Autowired
   br/>@Autowired
   br/>@Test
   @Test
   br/>System.out.println(commodityService.count());
   @Test
   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
   br/>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
   Commodity commodity = new Commodity();commodity.setSkuId("1501009002");
   commodityService.delete(commodity);
   @Test
   br/>commodity.setSkuId("1501009002");
   commodityService.delete(commodity);
   @Test
   Iterable iterable = commodityService.getAll();iterable.forEach(e->System.out.println(e.toString()));
   @Test
   br/>iterable.forEach(e->System.out.println(e.toString()));
   @Test
   List list = commodityService.getByName("面包");System.out.println(list);
   @Test
   br/>System.out.println(list);
   @Test
   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)
   br/>@RunWith(SpringRunner.class)
   public class ElasticsearchTemplateTest {@Autowired
   br/>@Autowired
   br/>@Test
   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
   br/>elasticsearchTemplate.index(indexQuery);
   @Test
   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
   https://docs.spring.io/spring-data/elasticsearch/docs/3.1.0.RELEASE/reference/html/#repositories.query-methods.details

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