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
    SpringBoot+Elasticsearch
  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
    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
    SpringBoot+Elasticsearch
  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;br/>@Data
    @Document(indexName = "commodity")
    public class Commodity implements Serializable {
    br/>@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
    SpringBoot+Elasticsearch
    package com.cjs.example.dao;
    import com.cjs.example.entity.Commodity;
    import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
    import org.springframework.stereotype.Repository;
    br/>@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;
    br/>@Service
    public class CommodityServiceImpl implements CommodityService {
    br/>@Autowired
    private CommodityRepository commodityRepository;
    br/>@Override
    public long count() {
    return commodityRepository.count();
    br/>@Override
    public Commodity save(Commodity commodity) {
    return commodityRepository.save(commodity);
    br/>@Override
    public void delete(Commodity commodity) {
    commodityRepository.delete(commodity);
    // commodityRepository.deleteById(commodity.getSkuId());
    br/>@Override
    public Iterable<Commodity> getAll() {
    return commodityRepository.findAll();
    br/>@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;
    br/>@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;
    br/>@RunWith(SpringRunner.class)
    @SpringBootTest
    public class CjsElasticsearchExampleApplicationTests {
    br/>@Autowired
    private CommodityService commodityService;
    br/>@Test
    public void contextLoads() {
    br/>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.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
    public void testDelete() {
    Commodity commodity = new Commodity();
    commodityService.delete(commodity);
    @Test
    br/>commodity.setSkuId("1501009002");
    commodityService.delete(commodity);
    @Test
    public void testGetAll() {
    Iterable<Commodity> iterable = commodityService.getAll();
    br/>iterable.forEach(e->System.out.println(e.toString()));
    @Test
    public void testGetByName() {
    List<Commodity> list = commodityService.getByName("面包");
    br/>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;
    br/>@RunWith(SpringRunner.class)
    @SpringBootTest
    public class ElasticsearchTemplateTest {
    br/>@Autowired
    public ElasticsearchTemplate elasticsearchTemplate;
    br/>@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();
    br/>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
    SpringBoot+Elasticsearch
  5. 演示
    SpringBoot+Elasticsearch
  6. 工程结构
    SpringBoot+Elasticsearch
  7. 参考
    https://docs.spring.io/spring-data/elasticsearch/docs/3.1.0.RELEASE/reference/html/#repositories.query-methods.details