ElasticsearchClient,ElasticsearchAsyncClient,RestClient,ElasticsearchTransport几个客户端的区别
时间: 2023-12-20 08:25:48 浏览: 45
ElasticsearchClient和ElasticsearchAsyncClient是Java客户端,用于与Elasticsearch集群进行交互。其中,ElasticsearchClient是同步客户端,而ElasticsearchAsyncClient是异步客户端。它们提供了一些方法来操作Elasticsearch集群,例如索引、搜索、聚合等。
RestClient是另一种Java客户端,它使用RESTful API与Elasticsearch集群进行交互。它支持同步和异步操作,并提供了多种请求方法,例如GET、POST、PUT、DELETE等。
ElasticsearchTransport是Elasticsearch自带的Java客户端,它使用TCP协议与Elasticsearch集群进行交互。它提供了一些方法来操作Elasticsearch集群,例如索引、搜索、聚合等。与其他Java客户端不同,ElasticsearchTransport仅支持同步操作。
总的来说,ElasticsearchClient、ElasticsearchAsyncClient和ElasticsearchTransport都是Java客户端,用于与Elasticsearch集群进行交互。RestClient是基于RESTful API的Java客户端。它们各有优缺点,可以根据实际需求选择使用。
相关问题
ElasticsearchClient,ElasticsearchAsyncClient,ElasticsearchClient,RestClient,ElasticsearchTransport区别
1. ElasticsearchClient: This is a synchronous client that provides a high-level API for interacting with Elasticsearch. It uses the REST API internally to communicate with Elasticsearch.
2. ElasticsearchAsyncClient: This is an asynchronous client that provides a high-level API for interacting with Elasticsearch. It uses the REST API internally to communicate with Elasticsearch and is designed to provide better performance for applications that require high throughput.
3. RestClient: This is a low-level REST client that provides a simple API for interacting with Elasticsearch. It allows you to send HTTP requests directly to Elasticsearch and receive responses in the form of JSON documents.
4. ElasticsearchTransport: This is a low-level transport client that provides a more efficient way to communicate with Elasticsearch than the REST API. It uses a binary protocol to communicate with Elasticsearch and is optimized for high throughput and low latency.
In summary, ElasticsearchClient and ElasticsearchAsyncClient are high-level clients that provide a simplified API for interacting with Elasticsearch, while RestClient and ElasticsearchTransport are low-level clients that provide more control over the communication with Elasticsearch.
给我写个ElasticsearchClient的工具类
好的,以下是一个简单的ElasticsearchClient工具类,你可以根据自己的需求进行修改和扩展:
```java
import java.io.IOException;
import java.util.List;
import org.apache.http.HttpHost;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
public class ElasticsearchClientUtil {
private static final String INDEX_NAME = "my_index";
private static final String TYPE_NAME = "my_type";
private RestHighLevelClient client;
public ElasticsearchClientUtil(String host, int port) {
client = new RestHighLevelClient(
RestClient.builder(new HttpHost(host, port, "http")));
}
public void close() throws IOException {
client.close();
}
public void indexDocument(String id, String jsonString) throws IOException {
IndexRequest indexRequest = new IndexRequest(INDEX_NAME, TYPE_NAME, id)
.source(jsonString, XContentType.JSON);
client.index(indexRequest, RequestOptions.DEFAULT);
}
public void indexDocument(String id, XContentBuilder source) throws IOException {
IndexRequest indexRequest = new IndexRequest(INDEX_NAME, TYPE_NAME, id).source(source);
client.index(indexRequest, RequestOptions.DEFAULT);
}
public BulkResponse bulkIndexDocuments(List<IndexRequest> requests) throws IOException {
BulkRequest bulkRequest = new BulkRequest();
for (IndexRequest request : requests) {
bulkRequest.add(request);
}
return client.bulk(bulkRequest, RequestOptions.DEFAULT);
}
public SearchResponse search(QueryBuilder queryBuilder, int from, int size) throws IOException {
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder()
.query(queryBuilder)
.from(from)
.size(size);
SearchRequest searchRequest = new SearchRequest(INDEX_NAME).source(sourceBuilder);
return client.search(searchRequest, RequestOptions.DEFAULT);
}
public static void main(String[] args) throws IOException {
ElasticsearchClientUtil clientUtil = new ElasticsearchClientUtil("localhost", 9200);
String jsonString = "{\"name\": \"John Doe\", \"age\": 25}";
XContentBuilder source = XContentFactory.jsonBuilder()
.startObject()
.field("name", "John Doe")
.field("age", 25)
.endObject();
clientUtil.indexDocument("1", jsonString);
clientUtil.indexDocument("2", source);
clientUtil.close();
}
}
```
这个工具类包含了一些基本的 Elasticsearch 操作,包括:
- 创建Elasticsearch客户端:使用给定的主机和端口创建RestHighLevelClient实例,这是与Elasticsearch进行交互的主要入口。
- 关闭Elasticsearch客户端:关闭RestHighLevelClient实例。
- 索引文档:将JSON字符串或XContentBuilder对象索引到指定的Elasticsearch索引和类型中。
- 批量索引文档:将多个索引请求打包成单个批量请求,并将其发送到Elasticsearch进行索引。
- 搜索文档:使用给定的QueryBuilder对象构建查询,然后使用SearchSourceBuilder构建搜索请求,最后使用RestHighLevelClient执行搜索请求并返回响应。
你可以根据自己的需求扩展这个工具类,添加更多的操作,例如删除文档、更新文档等等。