spring boot 集成 elasticsearch 7.x (一）

我会带着你远行 2023-03-13 05:54 12阅读 0赞

spring boot 版本 2.2.1  
elasticsearch 版本：7.4

使用 java api 的 high level client

## 1、Maven 配置 pom.xml ##

<dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>7.4.0</version>
        <exclusions>
            <exclusion>
                <groupId>org.elasticsearch</groupId>
                <artifactId>elasticsearch</artifactId>
            </exclusion>
            <exclusion>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>elasticsearch-rest-client</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-client</artifactId>
        <version>7.4.0</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>7.4.0</version>
    </dependency>

> 注意：这里需要加上 exclusions

applicaton.yml 配置

es:
        host: 127.0.0.1
        port: 9200
        scheme: http

## 2、创建索引 ##

@Autowired
        RestHighLevelClient restHighLevelClient;
        /** * @param idxName 索引名称 * @param idxSQL 索引描述 * @return void */
        public void createIndex(String idxName, String idxSQL) { 
            try { 
                if (!this.indexExist(idxName)) { 
                    log.error(" idxName={} 已经存在,idxSql={}", idxName, idxSQL);
                    return;
                }
                CreateIndexRequest request = new CreateIndexRequest(idxName);
                buildSetting(request);
                request.mapping(idxSQL, XContentType.JSON);
                CreateIndexResponse res = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
                if (!res.isAcknowledged()) { 
                    throw new RuntimeException("初始化失败");
                }
            } catch (Exception e) { 
                e.printStackTrace();
                System.exit(0);
            }
        }
    
     /** * 断某个index是否存在 * * @param idxName index名 * @return boolean */
    public boolean indexExist(String idxName) throws Exception { 
        GetIndexRequest request = new GetIndexRequest(idxName);
        request.local(false);
        request.humanReadable(true);
        request.includeDefaults(false);
        request.indicesOptions(IndicesOptions.lenientExpandOpen());
        return restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
    }
    
    
    
    /** * 设置分片 * * @param request * @return void */
    public void buildSetting(CreateIndexRequest request) { 
        request.settings(Settings.builder().put("index.number_of_shards", 3)
                .put("index.number_of_replicas", 2));
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3pocTQyNg_size_16_color_FFFFFF_t_70]  
注：图片来自 pixabay.com

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