詳解Elastic Search搜索引擎在SpringBoot中的實踐

2024-07-13 10:16:36

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實驗環境

ES版本：5.3.0
spring bt版本：1.5.9

首先當然需要安裝好elastic search環境，最好再安裝上可視化插件 elasticsearch-head來便于我們直觀地查看數據。

當然這部分可以參考本人的帖子：《centos7上elastic search安裝填坑記》

我的ES安裝在http://113.209.119.170:9200/這個地址（該地址需要配到springboot項目中去）

Spring工程創建

這部分沒有特殊要交代的，但有幾個注意點一定要當心

注意在新建項目時記得勾選web和NoSQL中的Elasticsearch依賴，來張圖說明一下吧：

SpringBoot,Elastic,Search,搜索引擎

創建工程時勾選Nosql中的es依賴選項

項目自動生成以后pom.xml中會自動添加spring-boot-starter-data-elasticsearch的依賴：

    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-data-elasticsearch</artifactId>    </dependency>

本項目中我們使用開源的基于restful的es java客戶端jest，所以還需要在pom.xml中添加jest依賴：

    <dependency>      <groupId>io.searchbox</groupId>      <artifactId>jest</artifactId>    </dependency>

除此之外還必須添加jna的依賴：

    <dependency>      <groupId>net.java.dev.jna</groupId>      <artifactId>jna</artifactId>    </dependency>

否則啟動spring項目的時候會報JNA not found. native methods will be disabled.的錯誤：

SpringBoot,Elastic,Search,搜索引擎

JNA not found. native methods will be disabled.

項目的配置文件application.yml中需要把es服務器地址配置對

server: port: 6325spring: elasticsearch:  jest:   uris:   - http://113.209.119.170:9200 # ES服務器的地址！   read-timeout: 5000

代碼組織

我的項目代碼組織如下：

SpringBoot,Elastic,Search,搜索引擎

項目代碼組織

各部分代碼詳解如下，注釋都有：

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<Entity> entityList);  List<Entity> 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());    }  }  /**   * 批量保存內容到ES   */  @Override  public void saveEntity(List<Entity> 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中搜索內容   */  @Override  public List<Entity> 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<Entity> addList = new ArrayList<Entity>();      addList.add(newEntity);      cityESService.saveEntity(addList);      return "OK";    }else {      return "Bad input value";    }  }  @RequestMapping(value="/search", method=RequestMethod.GET)  public List<Entity> save(String name) {    List<Entity> entityList = null;    if(StringUtils.isNotEmpty(name)) {      entityList = cityESService.searchEntity(name);    }    return entityList;  }}

實際實驗

增加幾條數據，可以使用postman工具，也可以直接在瀏覽器中輸入，如增加以下5條數據：

http://localhost:6325/entityController/save?id=1&name=南京中山陵http://localhost:6325/entityController/save?id=2&name=中國南京師范大學http://localhost:6325/entityController/save?id=3&name=南京夫子廟http://localhost:6325/entityController/save?id=4&name=杭州也非常不錯http://localhost:6325/entityController/save?id=5&name=中國南邊好像沒有叫帶京字的城市了

數據插入效果如下（使用可視化插件elasticsearch-head觀看）：

SpringBoot,Elastic,Search,搜索引擎