springboot整合ElasticSearch（restClient&restHighLevelClient CRUD操作演示）

1 根据项目架构选择整合方案

以springboot为例，可选方式有三种：

• JAVA API
  • 整合TransportClient客户端
  • 基于TCP通信
  • 已过时
• RestClient
  • 基于HTTP通信
  • Java Low Level REST Client
    • 兼容所有版本ES
  • Java Hight Level REST Client
    • 基于Low开发，只暴露部分API
• Spring-data-es
  • spring-data-elasticsearch

2 项目实践

考虑到时效性，只作后两种方案尝试

2.1 SpringData整合

• 按ES版本配置相关依赖（注意es与springdata的版本搭配）
• 配置xml，配置集群连接，创建bean对象elasticsearchTemplate
• 使用（CriteriaQuery与SearchQuery）
  • SearchQuery依赖于elasticsearch的原生QueryBuilders；
  • CriteriaQuery而是特定于Spring Data

参考链接：Spring data ES攻略

2.2 RestClient整合

2.2.1 引入依赖

• Java Low Level REST Client

<dependencies>
    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-client</artifactId>
        <version>6.4.0</version>
    </dependency>
</dependencies>

• Java Hight Level REST Client

<dependencies>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>6.0.0</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>6.0.0</version>
    </dependency>
</dependencies>

2.2.2客户端配置

2.2.2.1 Java Low Level REST Client

@Configuration
public class RestConfig {
   
    private String userName;
    private String password;
    private String hostName;
    private Integer port;
    @Bean(destroyMethod="close")
    public RestClient getClient(){
   
        String[] hosts = this.hostName.split(",");
        HttpHost[] httpHosts = new HttpHost[hosts.length];
        for(int i=0;i<hosts.length;i++){
   
            httpHosts[i] = new HttpHost(hiist[i],port,"http");
        }
        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthSope.ANY,
              new UsernamePasswordCredentials(userName,Password));
		RestClientBuilder restClientBuilder = RestClient.build(httpHosts);
        //配置身份验证
        restClientBuilder.setHttpClientConfigCallback(
        	return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
        return restClientBuilder.build();
    }
}

2.2.2.2 Java Hight Level REST Client

@Configuration
public class RestConfig {
   
    private String userName;
    private String password;
    private String hostName;
    private Integer port;
    @Bean()
    public RestHighLevelClient getRestClient(){
   
        String[] hosts = this.hostName.split(",");
        HttpHost[] httpHosts = new HttpHost[hosts.length];
        for(int i=0;i<hosts.length;i++){
   
            httpHosts[i] =