elasticsearch java客户端

1.引用maven配置

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

2.定义elasticsearch的配置文件到springboot的application.properties

#dev
#config.es.address=127.0.0.1:9200

3.将application.properties配置文件中的配置抽取到配置文件解析类ElasticSearchProperty中

ElasticSearchProperty.java

@Data
@Configuration
@PropertySource(value = "classpath:config/application.properties")
@ConfigurationProperties(prefix = "config.es")
public class ElasticSearchProperty {

    /**
     * 连接地址,格式：IP:端口
     * 多个逗号分隔
     * 示例：127.0.0.1:9201,127.0.0.1:9202,127.0.0.1:9203
     */
    private String address="";

    /**
     * 用户名
     */
    private String userName;

    /**
     * 密码
     */
    private String password;

    /**
     * 连接超时时间
     * 默认10s
     */
    private int connectTimeout = 10000;

    /**
     * socket超时时间
     * 默认10s
     */
    private int socketTimeout = 60000;

    /**
     * 请求连接超时时间
     * 默认10s
     */
    private int connectionRequestTimeout = 10000;

    /**
     * 最大分页size
     * 默认10000
     */
    private int maxPageSize;
}

4.elasticsearch配置类中，加载es客户端

import net.bytebuddy.implementation.bytecode.Throw;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.logging.log4j.util.Strings;
import org.elasticsearch.client.Node;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

import javax.annotation.Resource;

/**
 * ElasticSearch Rest client 配置
 */
@Configuration
public class ElasticSearchConfig {
    private static final Logger log = LoggerFactory.getLogger(ElasticSearchConfig.class);


    @Resource
    private ElasticSearchProperty elasticSearchProperty;

    public ElasticSearchProperty getElasticSearchProperty() {
        return elasticSearchProperty;
    }

    public void setElasticSearchProperty(ElasticSearchProperty elasticSearchProperty) {
        this.elasticSearchProperty = elasticSearchProperty;
    }
    
    // 定义restClient生成的相关builder
    @Bean
    public RestClientBuilder restClientBuilder() {
        Assert.notNull(elasticSearchProperty, "elasticSearchProperty cannot null ");
        Assert.notNull(elasticSearchProperty.getAddress(), "address hosts  cannot null ");

        //ElasticSearch 连接地址地址
        HttpHost[] httpHosts = this.getElasticSearchHttpHosts();
        return RestClient.builder(httpHosts).setRequestConfigCallback(requestConfigBuilder -> {
            //设置连接超时时间
            requestConfigBuilder.setConnectTimeout(elasticSearchProperty.getConnectTimeout());
            requestConfigBuilder.setSocketTimeout(elasticSearchProperty.getSocketTimeout());
            requestConfigBuilder.setConnectionRequestTimeout(elasticSearchProperty.getConnectionRequestTimeout());
            return requestConfigBuilder;
        }).setHttpClientConfigCallback(httpClientBuilder -> {
            //Commented by Allen 启用Auth的话，此属性会导致认证不通过
            //httpClientBuilder.disableAuthCaching();
            //设置账密
            return getHttpAsyncClientBuilder(httpClientBuilder);
        });
    }
    /**
     * ElasticSearch Rest client 配置,单例client并引用上面定义的clientBuilder
     *
     * @return RestHighLevelClient
     */
    @Bean
    public RestHighLevelClient restHighLevelClient(@Qualifier("restClientBuilder") RestClientBuilder restClientBuilder) {
        return new RestHighLevelClient(restClientBuilder);
    }

    /**
     * ElasticSearch 连接地址
     * 多个逗号分隔,es都连接都连接
     * 示例：127.0.0.1:9201,127.0.0.1:9202,127.0.0.1:9203
     */
    private HttpHost[] getElasticSearchHttpHosts() {
        String[] hosts = elasticSearchProperty.getAddress().split(",");
        HttpHost[] httpHosts = new HttpHost[hosts.length];
        for (int i = 0; i < httpHosts.length; i++) {
            String host = hosts[i];
            host = host.replaceAll("http://", "").replaceAll("https://", "");
            Assert.isTrue(host.contains(":"), String.format("your host:[%s] format error , Please refer to [ 127.0.0.1:9200 ] ,", host));
            httpHosts[i] = new HttpHost(host.split(":")[0], Integer.parseInt(host.split(":")[1]), "http");
        }
        return httpHosts;
    }

    private HttpAsyncClientBuilder getHttpAsyncClientBuilder(HttpAsyncClientBuilder httpClientBuilder) {
        if (Strings.isBlank(elasticSearchProperty.getUserName()) || Strings.isBlank(elasticSearchProperty.getPassword())) {
            return httpClientBuilder;
        }
        //账密设置
        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        //es账号密码（一般使用,用户elastic）
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(elasticSearchProperty.getUserName(), elasticSearchProperty.getPassword()));
        httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
        return httpClientBuilder;
    }
}

5.使用highLevelApi的client(ElasticSearchRestApiClient 引用了RestHighLevelClient)

ElasticSearchRestApiClient

@Slf4j
@Component
public class ElasticSearchRestApiClient {
    private static final String SEARCH_BY_AGG_UMPKEY = "delta.dao.es.searchByAgg";
    public static final String SCROLL_UMPKEY = "delta.dao.es.scroll";

    @Resource
    private ElasticSearchProperty elasticSearchProperty;

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    public RestHighLevelClient getRestHighLevelClient() {
        return restHighLevelClient;
    }


    public AsyncSearchClient getAsyncClient() {
        return restHighLevelClient.asyncSearch();
    }

    public void setRestHighLevelClient(RestHighLevelClient restHighLevelClient) {
        this.restHighLevelClient = restHighLevelClient;

    }

    /**
     * 默认主分片数
     */
    private static final int DEFAULT_SHARDS = 5;
    /**
     * 默认副本分片数
     */
    private static final int DEFAULT_REPLICAS = 1;

    /**
     * 判断索引是否存在
     *
     * @param index 索引
     * @return 返回 true，表示存在
     */
    public boolean existsIndex(String index) throws ElasticSearchRuntimeException {
        try {
            GetIndexRequest request = new GetIndexRequest(index);
            request.local(false);
            request.humanReadable(true);
            request.includeDefaults(false);

            return restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
        } catch (IOException e) {
            log.error("[ elasticsearch ] >> get index exists exception ,index:{} ", index, e);
            throw new ElasticSearchRuntimeException("[ elasticsearch ] >> get index exists exception:" + e.getMessage(), e);
        }
    }
}