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SpringBoot+Elasticsearch

  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

    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
    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;@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
    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;@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
    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

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