Elasticsearch基础（三）索引和文档操作

1、api种类

1.1 TransportClient

是Elasticsearch官方的api

TransportClient可以支持2.x，5.x版本，TransportClient将会在Elasticsearch 7.0弃用并在8.0中完成删除。

 

1.2 RestClient

也是Elasticsearch官方的api。

官方地址：https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/index.html

替代TransportClient，它使用HTTP请求而不是Java序列化请求。

 

1.3 Jest

Jest是Java社区开发的，是Elasticsearch的Java Http Rest客户端

 

1.4 Spring Data Elasticsearch

spring集成的Elasticsearch开发包

 

2、 RestClient-索引和文档操作 

pom:

        
            org.elasticsearch
            elasticsearch
            7.6.2
        
		
		    org.elasticsearch.client
		    elasticsearch-rest-high-level-client
		    7.6.2
		
		
		    junit
		    junit
		    4.13
		

java代码：

import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpHost;
import org.elasticsearch.action.DocWriteResponse;
import org.elasticsearch.action.admin.indices.alias.Alias;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.admin.indices.open.OpenIndexRequest;
import org.elasticsearch.action.admin.indices.open.OpenIndexResponse;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CloseIndexRequest;
import org.elasticsearch.client.indices.CloseIndexResponse;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.common.settings.Settings;
import org.junit.Before;
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runners.MethodSorters;

@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class RestHighLevelClientDemo {

	private RestHighLevelClient client;
	
	/**
	 * 创建客户端
	 * 
	 * @return
	 */
	@Before
	public void buildClient() {
		client = new RestHighLevelClient(
				RestClient.builder(new HttpHost("192.168.1.1.5", 9200, "http")));
	}
	/**
	 * 创建索引
	 * @throws IOException
	 */
	@Test
	public void test001createIndex() throws IOException {
		deleteIndex();
		CreateIndexRequest request = new CreateIndexRequest("person_index");//索引名不能有大写字母，必须全部小写，否则es无法创建索引
		// 分片配置
		request.settings(Settings.builder().put("index.number_of_shards", 1).put("index.number_of_replicas", 0));
		// mapping配置
		Map name = new HashMap();
		name.put("type", "text");
		Map age = new HashMap();
		age.put("type", "text");

		Map properties = new HashMap();
		properties.put("name", name);
		properties.put("age", age);

		Map mapping = new HashMap();
		mapping.put("properties", properties);
		request.mapping(mapping);

		// 为索引设置一个别名
		request.alias(new Alias("person_alias"));

		CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
		System.out.println(request.index()+"创建索引"+createIndexResponse.isAcknowledged());
	}
	/**
	 * 判断索引是否存在
	 * @throws IOException
	 */
	@Test
	public void test002existsIndex() throws IOException {
		GetIndexRequest request = new GetIndexRequest("person_index");
		request.includeDefaults(true);
		request.indicesOptions(IndicesOptions.lenientExpandOpen());
		boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
		if (exists) {
			System.out.println("索引存在");
		} else {
			System.out.println("索引不存在");
		}
		assertTrue(exists);
	}
	/**
	 * 打开索引
	 */
	@Test
	public void test003openIndex() {
		OpenIndexRequest request = new OpenIndexRequest("person_index");
		try {
			OpenIndexResponse openIndexResponse = client.indices().open(request, RequestOptions.DEFAULT);
			boolean acknowledged = openIndexResponse.isAcknowledged();
			System.out.println("openIndex:"+acknowledged);
			
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
	/***
	 * 关闭索引
	 */
	@Test
	public void test004closeIndex() {
		CloseIndexRequest request = new CloseIndexRequest("person_index"); 
		try {
			CloseIndexResponse closeIndexResponse = client.indices().close(request, RequestOptions.DEFAULT);
			boolean acknowledged = closeIndexResponse.isAcknowledged(); 
			System.out.println("closeIndex:"+acknowledged);
			test003openIndex();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
	/**
	 * 删除索引
	 */
	public void deleteIndex() {
		DeleteIndexRequest request = new DeleteIndexRequest("person_index"); 
		AcknowledgedResponse deleteIndexResponse;
		try {
			deleteIndexResponse = client.indices().delete(request, RequestOptions.DEFAULT);
			boolean acknowledged = deleteIndexResponse.isAcknowledged(); 
			System.out.println("deleteIndex:"+acknowledged);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	// doc 操作#########################################################################
	/**
	 * 新增文档
	 * @throws IOException
	 */
	@Test
	public void test006insertDoc() throws IOException {
		Map jsonMap = new HashMap<>();
		jsonMap.put("user", "kimchy");
		jsonMap.put("id", new Date().getTime());
		jsonMap.put("postDate", new Date());
		jsonMap.put("message", "trying out Elasticsearch22");
		IndexRequest indexRequest = new IndexRequest("person_index").id("2").source(jsonMap);

		IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
		System.out.println("insertDoc:"+indexResponse.getId());

	}
	/**
	 * 查询文档
	 * @throws IOException
	 */
	@Test
	public void test007queryDoc() throws IOException {
		GetRequest getRequest = new GetRequest("person_index", "2");
		GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
		System.out.println("queryDoc:"+getResponse.getSourceAsString());
	}
	/**
	 * 更新文档
	 */
	@Test
	public void test008updateDoc() {
		Map jsonMap = new HashMap<>();
		jsonMap.put("updated", new Date());
		jsonMap.put("car", "BMW");
		jsonMap.put("message", "daily update");
		UpdateRequest request = new UpdateRequest("person_index", "2").doc(jsonMap);
		try {
			UpdateResponse updateResponse = client.update(request, RequestOptions.DEFAULT);
			System.out.println("updateDoc:");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 删除文档
	 */
	@Test
	public void test009deleteDoc() {
		DeleteRequest request = new DeleteRequest("person_index", "a06KsXEBRH_WDXoYCFbn");
		try {

			DeleteResponse deleteResponse = client.delete(request, RequestOptions.DEFAULT);
			if (deleteResponse.getResult() == DocWriteResponse.Result.NOT_FOUND) {
				System.out.println("文档删除成功");
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void test010deleteIndex2() {
		//deleteIndex();
	}
}