來源：https://www.cnblogs.com/cjsblog/p/9756978.html
1. 前言
1.1. 集成方式
Spring Boot中集成Elasticsearch有4種方式：
- REST Client
- Jest
- Spring Data
- Spring Data Elasticsearch Repositories
本文用後面兩種方式來分別連接並操作Elasticsearch
1.2. 環境與配置
服務端：elasticsearch-6.3.2 1臺
客戶端：elasticsearch 6.4.1
服務端配置文件：elasticsearch.yml
<code>cluster.name: my-application
network.host: 192.168.1.134
http.port: 9200/<code>
/etc/security/limits.conf
<code>cheng soft nofile 65536
cheng hard nofile 65536/<code>
/etc/sysctl.conf
<code>vm.max_map_count=262144/<code>
1.3. 版本
Spring Boot 2.0.5默認的elasticsearch版本很低，這裡我們用最新版本6.4.1
如果啟動過程中出現
java.lang.NoClassDefFoundError: org/elasticsearch/common/transport/InetSocketTransportAddress
則說明，elasticsearch依賴的jar包版本不一致，統一改成6.4.1即可
另外，Spring Boot 2.0.5依賴的spring-data-elasticsearch版本是3.0.1，需要升級到3.1.0
2. 依賴
3. application.properties
<code>spring.data.elasticsearch.cluster-name=my-application
spring.data.elasticsearch.cluster-nodes=192.168.1.134:9300/<code>
也許，大家會疑惑，配置文件中明明寫的端口是9200，為何這裡配置文件中連接的時候寫的端口是9300呢？
因為，配置9200是通過HTTP連接的端口，9300是TCP連接的端口
4. 操作
4.1. 使用Spring Data Elasticsearch Repositories操作Elasticsearch
首先，定義一個實體類
<code>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;
}/<code>
這裡定義了Commodity實例，表示商品。在Elasticsearch 6.X 版本中，不建議使用type，而且在7.X版本中將會徹底廢棄type，所以此處我只指定了indexName，沒有指定type。這裡，一個Commodity代表一個商品，同時代表一條索引記錄。
類比關係型數據庫的話，Index相當於表，Document相當於記錄
然後，需要自己定義一個接口，並繼承ElasticsearchRepository
<code>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> {
}/<commodity>/<code>
這裡的Repository相當於DAO，操作mysql還是elasticsearch都是一樣的
接下來，定義service接口
<code>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);
}/<commodity>/<commodity>/<commodity>/<code>
實現類
<code>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);
}
}/<commodity>/<commodity>/<commodity>/<commodity>/<commodity>/<code>
在這個Service中演示了增刪查改操作，還有分頁查詢
最後，寫一個測試類測試其中的方法
<code>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片裝）");
commodity.setCategory("101");
commodity.setPrice(880);
commodity.setBrand("良品鋪子");
commodityService.save(commodity);
commodity = new Commodity();
commodity.setSkuId("1501009002");
commodity.setName("原味切片面包（6片裝）");
commodity.setCategory("101");
commodity.setPrice(680);
commodity.setBrand("良品鋪子");
commodityService.save(commodity);
commodity = new Commodity();
commodity.setSkuId("1501009004");
commodity.setName("元氣吐司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("麵包");
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());
}
}/<commodity>/<commodity>/<commodity>/<code>
以上，便是使用Elasticsearch Repositories的方式
4.2. 使用ElasticsearchTemplate方式操作Elasticsearch
<code>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("葡萄吐司麵包（10片裝）");
commodity.setCategory("101");
commodity.setPrice(160);
commodity.setBrand("良品鋪子");
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);
}
}/<commodity>/<code>
ElasticsearchTemplate是自動配置的
5. 演示
6. 工程結構
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