SpringBoot2.3.4整合Elasticsearch7.6.2

概述

全文检索是程序员开发过程中常见的需求之一，开源的Elasticsearch是目前全文搜索引擎的首选，常用于快速存储、搜索和分析海量数据，Elasticsearch封装了Lucene，提供REST API操作接口，使用方便，本文介绍SpringBoot2.3.0整合Elasticsearch7.6.2，为了方便测试，持久层使用Mybatis-Plus，测试使用Swagger3.0。若需要了解SpringBoot整合Mybtis-Plus相关内容，请阅读另一篇SpringBoot2.3.0整合MyBatis-Plus3.4.0和Swagger3.0
springboot中访问elasticsearch有以下几种方式：

1. JestClient：非官方，更新慢
2. RestTemplate：模拟HTTP请求，ES很多操作需要自己封装，较麻烦
3. HttpClient：同上
4. Elasticsearch-Rest-Client：官方RestClient，封装了ES操作，API层次分明，上手简单

引入相关依赖

核心依赖如下：

<dependency>
    <groupId>org.elasticsearch.clientgroupId>
    <artifactId>elasticsearch-rest-high-level-clientartifactId>
    <version>7.6.2version>
dependency>

配置文件

@Configuration
public class ElasticsearchConfig {
     
    public static final RequestOptions COMMON_OPTIONS;
    static {
     
        RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
        COMMON_OPTIONS = builder.build();
    }
    @Bean
    public RestHighLevelClient restClient() {
     
        RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.108.11", 9200, "http")));
        return client;
    }
}

业务层代码

public DocWriteResponse.Result indexElasticsearchData(String index, List<SysUser> userList) {
     
    IndexRequest request = new IndexRequest(index);
    DocWriteResponse.Result result = null;
    try {
     
        for (SysUser user : userList) {
     
            request.id(String.valueOf(user.getId()));
            String esStr = JSON.toJSONString(user);
            request.source(esStr, XContentType.JSON);
            IndexResponse response = restHighLevelClient.index(request, ElasticsearchConfig.COMMON_OPTIONS);
            result = response.getResult();
        }
    } catch (IOException e) {
     
        e.printStackTrace();
    }
    return result;
}

控制层代码

@PostMapping("/indexElasticsearchData")
@ApiOperation(value = "将用户信息保存进es中")
public AjaxResult indexElasticsearchData() throws IOException {
     
    List<SysUser> userList = userService.list(null);
    DocWriteResponse.Result result = userService.indexElasticsearchData("sysuser", userList);
    return AjaxResult.ok().data("result", result);
}

完整代码请参考码云地址