SpringBoot integrates elasticsearch

Before starting this article, you need to install an ElasticSearch first. If you are mac or linux, you can refer to https://www.jianshu.com/p/e47b451375ea , if you are windows, you can customize Baidu.

The following is the official formula to introduce elasticsearch:

ElasticSearch is a Lucene-based search server. It provides a distributed multi-user capable full-text search engine based on a RESTful web interface. Developed in Java and released as open source under the terms of the Apache License, Elasticsearch is the current popular enterprise search engine. Designed for use in cloud computing, it can achieve real-time search, stable, reliable, fast, and easy to install and use.
We build a website or application and want to add a search function, but it is very difficult to create a search job. We want our search solution to be fast, we want a zero configuration and a completely free search mode, we want to be able to simply use JSON to index data over HTTP, we want our search server to be always available, we want to be able to Starting with one and scaling to hundreds, we want real-time search, we want simple multi-tenancy, we want to build a cloud solution. So we use Elasticsearch to solve all these problems and many more that may arise.

For specific elasticsearch-related issues, you can go to the elastic Chinese community to view.

This article will introduce how springboot can easily integrate elasticsearch.

1. Start elasticsearch.
2. Create a new project and add elasticsearch dependencies to the pom file. The complete pom is as follows:

<?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.dalaoyang</groupId>
    <artifactId>springboot_elasticsearch</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot_elasticsearch</name>
    <description>springboot_elasticsearch</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.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>
    </properties>

    <dependencies>
        <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.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </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>

The configuration file is as follows:

##端口号
server.port=8888

##es地址
spring.data.elasticsearch.cluster-nodes = 127.0.0.1:9300

Create a new commodity entity class GoodsInfo, which needs attention:
indexName: The index name can be understood as the database name must be lowercase, otherwise an org.elasticsearch.indices.InvalidIndexNameException exception will be reported
type: The type can be understood as the table name

package com.dalaoyang.entity;

import org.springframework.data.elasticsearch.annotations.Document;

import java.io.Serializable;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.entity
 * @email [email protected]
 * @date 2018/5/4
 */
@Document(indexName = "testgoods",type = "goods")
//indexName索引名称 可以理解为数据库名 必须为小写 不然会报org.elasticsearch.indices.InvalidIndexNameException异常
//type类型 可以理解为表名
public class GoodsInfo implements Serializable {
    private Long id;
    private String name;
    private String description;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public GoodsInfo(Long id, String name, String description) {
        this.id = id;
        this.name = name;
        this.description = description;
    }

    public GoodsInfo() {
    }
}

Create GoodsRepository, inherit ElasticsearchRepository, the code is as follows:

package com.dalaoyang.repository;

import com.dalaoyang.entity.GoodsInfo;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Component;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.repository
 * @email [email protected]
 * @date 2018/5/4
 */
@Component
public interface GoodsRepository extends ElasticsearchRepository<GoodsInfo,Long> {
}

Finally, create a new controller for testing, which includes simple additions, deletions, and changes and a search. The additions, deletions, and changes are not explained here. It should be noted that the first page number of es is 0

package com.dalaoyang.controller;

import com.dalaoyang.entity.GoodsInfo;
import com.dalaoyang.repository.GoodsRepository;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.data.elasticsearch.core.query.SearchQuery;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.controller
 * @email [email protected]
 * @date 2018/5/4
 */
@RestController
public class GoodsController {

    @Autowired
    private GoodsRepository goodsRepository;

    //http://localhost:8888/save
    @GetMapping("save")
    public String save(){
        GoodsInfo goodsInfo = new GoodsInfo(System.currentTimeMillis(),
                "商品"+System.currentTimeMillis(),"这是一个测试商品");
        goodsRepository.save(goodsInfo);
        return "success";
    }

    //http://localhost:8888/delete?id=1525415333329
    @GetMapping("delete")
    public String delete(long id){
        goodsRepository.delete(id);
        return "success";
    }

    //http://localhost:8888/update?id=1525417362754&name=修改&description=修改
    @GetMapping("update")
    public String update(long id,String name,String description){
        GoodsInfo goodsInfo = new GoodsInfo(id,
                name,description);
        goodsRepository.save(goodsInfo);
        return "success";
    }

    //http://localhost:8888/getOne?id=1525417362754
    @GetMapping("getOne")
    public GoodsInfo getOne(long id){
        GoodsInfo goodsInfo = goodsRepository.findOne(id);
        return goodsInfo;
    }


    //每页数量
    private Integer PAGESIZE=10;

    //http://localhost:8888/getGoodsList?query=商品
    //http://localhost:8888/getGoodsList?query=商品&pageNumber=1
    //根据关键字"商品"去查询列表，name或者description包含的都查询
    @GetMapping("getGoodsList")
    public List<GoodsInfo> getList(Integer pageNumber,String query){
        if(pageNumber==null) pageNumber = 0;
        //es搜索默认第一页页码是0
        SearchQuery searchQuery=getEntitySearchQuery(pageNumber,PAGESIZE,query);
        Page<GoodsInfo> goodsPage = goodsRepository.search(searchQuery);
        return goodsPage.getContent();
    }


    private SearchQuery getEntitySearchQuery(int pageNumber, int pageSize, String searchContent) {
        FunctionScoreQueryBuilder functionScoreQueryBuilder = QueryBuilders.functionScoreQuery()
                .add(QueryBuilders.matchPhraseQuery("name", searchContent),
                        ScoreFunctionBuilders.weightFactorFunction(100))
                .add(QueryBuilders.matchPhraseQuery("description", searchContent),
                        ScoreFunctionBuilders.weightFactorFunction(100))
                //设置权重分 求和模式
                .scoreMode("sum")
                //设置权重分最低分
                .setMinScore(10);

        // 设置分页
        Pageable pageable = new PageRequest(pageNumber, pageSize);
        return new NativeSearchQueryBuilder()
                .withPageable(pageable)
                .withQuery(functionScoreQueryBuilder).build();
    }

}

Start the project, first call the http://localhost:8888/save method, insert a few pieces of data, and then go to the es management page http://localhost:9200/_plugin/head/ , as shown below

Visit http://localhost:8888/getGoodsList?query=Goods , as shown in the figure:

Source code download: Da Lao Yang Code Cloud

Personal website: https://www.dalaoyang.cn

SpringBoot integrates elasticsearch

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