Spring Boot & ES 实战，值得参考！
时间：2020-06-19 14:01:26
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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);
????}
}
ElasticsearchTemplate是自动配置的
5. 演示
6. 工程结构
7. 参考
推荐去我的博客阅读更多：
2.Spring MVC、Spring Boot、Spring Cloud 系列教程
3.Maven、Git、Eclipse、Intellij IDEA 系列工具教程
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原文：https://www.cnblogs.com/javastack/p/13162636.html
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