SpringBoot+Elasticsearch

發布時間：2020-08-09 04:24:29 來源：網絡閱讀：2577 作者：小楊Java 欄目：大數據

前言
1.1. 集成方式
Spring Boot中集成Elasticsearch有4種方式：
本文用后面兩種方式來分別連接并操作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
/etc/security/limits.conf
/etc/sysctl.conf
1.3. 版本
Spring Boot 2.0.5默認的elasticsearch版本很低，這里我們用最新版本6.4.1
如果啟動過程中出現
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
依賴
<?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/> 
</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>
application.properties
也許，大家會疑惑，配置文件中明明寫的端口是9200，為何這里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
操作
4.1. 使用Spring Data Elasticsearch Repositories操作Elasticsearch
首先，定義一個實體類
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;
這里定義了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。這里，一個Commodity代表一個商品，同時代表一條索引記錄。
類比關系型數據庫的話，Index相當于表，Document相當于記錄
然后，需要自己定義一個接口，并繼承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
這里的Repository相當于DAO，操作mysql還是elasticsearch都是一樣的
接下來，定義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);
實現類
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
return commodityRepository.findAll();@Override
br/>@Override
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
br/>@Override
SearchQuery searchQuery = new NativeSearchQueryBuilder()
.withQuery(QueryBuilders.matchPhraseQuery("name", kw))
.withPageable(PageRequest.of(pageNo, pageSize))
.build();
return commodityRepository.search(searchQuery);
在這個Service中演示了增刪查改操作，還有分頁查詢
最后，寫一個測試類測試其中的方法
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
br/>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
Commodity commodity = new Commodity();commodity.setSkuId("1501009002");
commodityService.delete(commodity);
@Test
br/>commodity.setSkuId("1501009002");
commodityService.delete(commodity);
@Test
Iterable<Commodity> iterable = commodityService.getAll();iterable.forEach(e->System.out.println(e.toString()));
@Test
br/>iterable.forEach(e->System.out.println(e.toString()));
@Test
List<Commodity> list = commodityService.getByName("面包");System.out.println(list);
@Test
br/>System.out.println(list);
@Test
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)
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片裝）");
commodity.setCategory("101");
commodity.setPrice(160);
commodity.setBrand("良品鋪子");
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<Commodity> list = elasticsearchTemplate.queryForList(searchQuery, Commodity.class);
System.out.println(list);
ElasticsearchTemplate是自動配置的
演示
工程結構
參考
https://docs.spring.io/spring-data/elasticsearch/docs/3.1.0.RELEASE/reference/html/#repositories.query-methods.details