千家信息网

Elastic Search搜索引擎在SpringBoot中的实践

发表于:2024-12-04 作者:千家信息网编辑
千家信息网最后更新 2024年12月04日,实验环境ES版本:5.3.0spring bt版本:1.5.9首先当然需要安装好elastic search环境,最好再安装上可视化插件 elasticsearch-head来便于我们直观地查看数据。
千家信息网最后更新 2024年12月04日Elastic Search搜索引擎在SpringBoot中的实践


实验环境

  • ES版本:5.3.0
  • spring bt版本:1.5.9

首先当然需要安装好elastic search环境,最好再安装上可视化插件 elasticsearch-head来便于我们直观地查看数据。

当然这部分可以参考本人的帖子:
《centos7上elastic search安装填坑记》
https://www.jianshu.com/p/04f4d7b4a1d3

我的ES安装在http://113.209.119.170:9200/这个地址(该地址需要配到springboot项目中去)


Spring工程创建

这部分没有特殊要交代的,但有几个注意点一定要当心

  • 注意在新建项目时记得勾选web和NoSQL中的Elasticsearch依赖,来张图说明一下吧:

项目自动生成以后pom.xml中会自动添加spring-boot-starter-data-elasticsearch的依赖:

                    org.springframework.boot            spring-boot-starter-data-elasticsearch        
  • 本项目中我们使用开源的基于restful的es java客户端jest,所以还需要在pom.xml中添加jest依赖:

                io.searchbox        jest    
  • 除此之外还必须添加jna的依赖:
                net.java.dev.jna        jna    

否则启动spring项目的时候会报JNA not found. native methods will be disabled.的错误:

  • 项目的配置文件application.yml中需要把es服务器地址配置对
    server:port: 6325

spring:
elasticsearch:
jest:
uris:

  • http://113.209.119.170:9200 # ES服务器的地址!
    read-timeout: 5000

代码组织

我的项目代码组织如下:

各部分代码详解如下,注释都有:

  • Entity.java
package com.hansonwang99.springboot_es_demo.entity;import java.io.Serializable;import org.springframework.data.elasticsearch.annotations.Document;public class Entity implements Serializable{    private static final long serialVersionUID = -763638353551774166L;    public static final String INDEX_NAME = "index_entity";    public static final String TYPE = "tstype";    private Long id;    private String name;    public Entity() {        super();    }    public Entity(Long id, String name) {        this.id = id;        this.name = name;    }    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;    }}
  • TestService.java
package com.hansonwang99.springboot_es_demo.service;import com.hansonwang99.springboot_es_demo.entity.Entity;import java.util.List;public interface TestService {    void saveEntity(Entity entity);    void saveEntity(List entityList);    List searchEntity(String searchContent);}
  • TestServiceImpl.java
package com.hansonwang99.springboot_es_demo.service.impl;import java.io.IOException;import java.util.List;import com.hansonwang99.springboot_es_demo.entity.Entity;import com.hansonwang99.springboot_es_demo.service.TestService;import org.elasticsearch.index.query.QueryBuilders;import org.elasticsearch.search.builder.SearchSourceBuilder;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import io.searchbox.client.JestClient;import io.searchbox.client.JestResult;import io.searchbox.core.Bulk;import io.searchbox.core.Index;import io.searchbox.core.Search;@Servicepublic class TestServiceImpl implements TestService {    private static final Logger LOGGER = LoggerFactory.getLogger(TestServiceImpl.class);    @Autowired    private JestClient jestClient;    @Override    public void saveEntity(Entity entity) {        Index index = new Index.Builder(entity).index(Entity.INDEX_NAME).type(Entity.TYPE).build();        try {            jestClient.execute(index);            LOGGER.info("ES 插入完成");        } catch (IOException e) {            e.printStackTrace();            LOGGER.error(e.getMessage());        }    }    /**     * 批量保存内容到ES     */    @Override    public void saveEntity(List entityList) {        Bulk.Builder bulk = new Bulk.Builder();        for(Entity entity : entityList) {            Index index = new Index.Builder(entity).index(Entity.INDEX_NAME).type(Entity.TYPE).build();            bulk.addAction(index);        }        try {            jestClient.execute(bulk.build());            LOGGER.info("ES 插入完成");        } catch (IOException e) {            e.printStackTrace();            LOGGER.error(e.getMessage());        }    }    /**     * 在ES中搜索内容     */    @Override    public List searchEntity(String searchContent){        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();        //searchSourceBuilder.query(QueryBuilders.queryStringQuery(searchContent));        //searchSourceBuilder.field("name");        searchSourceBuilder.query(QueryBuilders.matchQuery("name",searchContent));        Search search = new Search.Builder(searchSourceBuilder.toString())                .addIndex(Entity.INDEX_NAME).addType(Entity.TYPE).build();        try {            JestResult result = jestClient.execute(search);            return result.getSourceAsObjectList(Entity.class);        } catch (IOException e) {            LOGGER.error(e.getMessage());            e.printStackTrace();        }        return null;    }}
  • EntityController.java
package com.hansonwang99.springboot_es_demo.controller;import java.util.ArrayList;import java.util.List;import com.hansonwang99.springboot_es_demo.entity.Entity;import com.hansonwang99.springboot_es_demo.service.TestService;import org.apache.commons.lang.StringUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping("/entityController")public class EntityController {    @Autowired    TestService cityESService;    @RequestMapping(value="/save", method=RequestMethod.GET)    public String save(long id, String name) {        System.out.println("save 接口");        if(id>0 && StringUtils.isNotEmpty(name)) {            Entity newEntity = new Entity(id,name);            List addList = new ArrayList();            addList.add(newEntity);            cityESService.saveEntity(addList);            return "OK";        }else {            return "Bad input value";        }    }    @RequestMapping(value="/search", method=RequestMethod.GET)    public List save(String name) {        List entityList = null;        if(StringUtils.isNotEmpty(name)) {            entityList = cityESService.searchEntity(name);        }        return entityList;    }}

实际实验

增加几条数据,可以使用postman工具,也可以直接在浏览器中输入,如增加以下5条数据:

http://localhost:6325/entityController/save?id=1&name=南京中山陵http://localhost:6325/entityController/save?id=2&name=中国南京师范大学http://localhost:6325/entityController/save?id=3&name=南京夫子庙http://localhost:6325/entityController/save?id=4&name=杭州也非常不错http://localhost:6325/entityController/save?id=5&name=中国南边好像没有叫带京字的城市了

数据插入效果如下(使用可视化插件elasticsearch-head观看):

我们来做一下搜索的测试:例如我要搜索关键字"南京"
我们在浏览器中输入:

http://localhost:6325/entityController/search?name=南京

搜索结果如下:

刚才插入的5条记录中包含关键字"南京"的四条记录均被搜索出来了!

当然这里用的是standard分词方式,将每个中文都作为了一个term,凡是包含"南"、"京"关键字的记录都被搜索了出来,只是评分不同而已,当然还有其他的一些分词方式,此时需要其他分词插件的支持,此处暂不涉及,后文中再做探索。

0