zoukankan      html  css  js  c++  java

  • Spring Boot & ES 实战，值得参考！

    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

    https://docs.spring.io/spring-data/elasticsearch/docs/3.1.0.RELEASE/reference/html/#repositories.query-methods.details

    推荐去我的博客阅读更多：

    1.Java JVM、集合、多线程、新特性系列教程

    2.Spring MVC、Spring Boot、Spring Cloud 系列教程

    3.Maven、Git、Eclipse、Intellij IDEA 系列工具教程

    4.Java、后端、架构、阿里巴巴等大厂最新面试题

    觉得不错，别忘了点赞+转发哦！
  • 相关阅读:
    关于C++中如何判断文件，目录存在的若干方法
    AStyle2.02在VS2008下的使用
    opencv与wxwidgets冲突(第三方库jpeg,tiff,png,zlib所引起)
    C和C++获取文件大小的方法总结
    跨平台项目组织2
    md5函数C语言实现
    分享本人自编的一个跨平台项目：伙食管理小软件
    win7 vs2008 release mt.exe停止工作
    跨平台项目组织
    SQL注入语句 (很全)
  • 原文地址：https://www.cnblogs.com/javastack/p/13162636.html
Copyright © 2011-2022 走看看