ElasticSearch的三大客户端比较

小鱼儿 2021-11-22 09:26 312阅读 0赞

## 一、TransportClient ##

**pom.xml**

<dependency>
                <groupId>org.elasticsearch</groupId>
                <artifactId>elasticsearch</artifactId>
                <version>${elasticsearch.version}</version>
            </dependency>
    
            <dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>transport</artifactId>
                <version>${elasticsearch.version}</version>
            </dependency>
    
            <dependency>
                <groupId>org.elasticsearch.plugin</groupId>
                <artifactId>transport-netty4-client</artifactId>
                <version>${elasticsearch.version}</version>
            </dependency>

**demo**

public static void main(String[] args) throws Exception {
            // 设置集群名称
            Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();
            // 创建client
            TransportClient client = new PreBuiltTransportClient(settings).addTransportAddress(new TransportAddress(InetAddress.getByName("node1"), 9300));
            // 搜索数据
            GetResponse response = client.prepareGet("你好", "测试", "1").execute().actionGet();
            client.close();
    }

## 二、JestClient ##

**pom.xml**

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
            </dependency>
    
            <dependency>
                <groupId>io.searchbox</groupId>
                <artifactId>jest</artifactId>
                <version>${elasticsearch.version}</version>
            </dependency>

**demo**

public static void main(String[] args) throws Exception {
         try {
            String index = "你好";
            JestResult jestResult = jestClient.execute(new CreateIndex.Builder(index).build());
            System.out.println("createIndex:{}" + jestResult.isSucceeded());
        } catch (IOException e) {
            e.printStackTrace();
        }   
    }

## 三、RestClient ##

**pom.xml**

<dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>rest</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>

**demo**

public static void main(String[] args) throws Exception {
            RestClient restClient = RestClient.builder(new HttpHost("localhost", 9200, "http")).build();
            String method = "GET";
            String endpoint = "/book";
            Response response = restClient.performRequest(method, endpoint);
            System.out.println(EntityUtils.toString(response.getEntity()));
    }

## 四、区分优缺点 ##

<table> 
 <thead> 
  <tr> 
   <th></th> 
   <th>TransportClient</th> 
   <th>JestClient</th> 
   <th>RestClient</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>优点</td> 
   <td>启动速度快，轻量级，可创建极多连接，与应用程序解耦；推荐使用原生的，ES本身就很简单，灵活性很高。</td> 
   <td>提供Restful API， 原生ES API不具备；若ES集群使用不同的ES版本，使用原生ES API会有问题，而Jest不会；更安全（可以在Http层添加安全处理）；JestClient是ElasticSearch的Java HTTP Rest客户端； JestClient填补了 ElasticSearch缺少HttpRest接口客户端的空白; JestClient可以跨版本。</td> 
   <td>RestClient 使用HTTP API elasticsearch代替内部协议。这需要更少依赖关系。你也不需要关注那么多版本；RestClient可以跨版本，但是也是要这个api版本都支持 才可以跨。</td> 
  </tr> 
  <tr> 
   <td>缺点</td> 
   <td>分发或查询数据速度较慢，不能获取指定节点数据。</td> 
   <td>暂时未发现</td> 
   <td>HttpClient和Jsoup都不直接支持发送DELETE方法带参数的请求。</td> 
  </tr> 
 </tbody> 
</table>