Java操作ElasticSearch之创建客户端连接

发布时间：『 2017-09-11 17:02』博客类别：elasticsearch 阅读(3157)

ElasticSearch提供了主流开发语言的连接开发包

新建的maven项目添加如下依赖即可：

注意几点：客户端版本号要与服务端的es版本号保持一致。

    <dependencies>
       <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>3.8.1</version>
           <scope>test</scope>
       </dependency>
       <dependency>
           <groupId>org.elasticsearch.client</groupId>
           <artifactId>transport</artifactId>
           <version>6.2.4</version>
       </dependency>
       <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>4.12</version>
           <scope>test</scope>
       </dependency>
       <dependency>
           <groupId>com.google.code.gson</groupId>
           <artifactId>gson</artifactId>
           <version>2.8.2</version>
       </dependency>
   </dependencies>

连接代码：

package com.java1234.es;

import java.net.InetAddress;

import org.elasticsearch.client.transport.TransportClient;

import org.elasticsearch.common.settings.Settings;

import org.elasticsearch.common.transport.InetSocketTransportAddress;

import org.elasticsearch.transport.client.PreBuiltTransportClient;

public class Test {

private static String host="192.168.1.108"; // 服务器地址

private static int port=9300; // 端口

public static void main(String[] args) throws Exception{

TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)

.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(Test.host), Test.port));

System.out.println(client);

client.close();

}

这里有个Setting 等后面讲到集群再详解；

Java操作ElasticSearch之创建索引（索引的名称--库，类型--表名称，文档id--数据）

client.prepareIndex ("qq", "tweet","1")创建索引

client.prepareGet("qq", "tweet","1") 获取文档

ElasticSearch客户端提供了多种方式的数据创建方式，包括json串,map,内置工具；我们正式开始一般用json格式，借助json工具框架，比如gson ,json-lib,fastjson等等；

我们给下实例：

package com.java1234.es;

import java.net.InetAddress;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

import org.elasticsearch.action.index.IndexResponse;

import org.elasticsearch.client.transport.TransportClient;

import org.elasticsearch.common.settings.Settings;

import org.elasticsearch.common.transport.InetSocketTransportAddress;

import org.elasticsearch.common.xcontent.XContentFactory;

import org.elasticsearch.common.xcontent.XContentType;

import org.elasticsearch.transport.client.PreBuiltTransportClient;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import com.google.gson.JsonObject;

/**

* ElasticSearch客户端连接服务器测试

* @author Administrator

*

*/

public class EsTest {

private static String host="192.168.1.108"; // 服务器地址

private static int port=9300; // 端口

private TransportClient client=null;

/**

* 获取连接

* @return

*/

@SuppressWarnings({ "unchecked", "resource" })

@Before

public void getCient()throws Exception{

client = new PreBuiltTransportClient(Settings.EMPTY)

.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(EsTest.host), EsTest.port));

}

/**

* 关闭连接

* @param client

*/

@After

public void close(){

if(client!=null){

client.close();

}

/**

* 添加索引

*/

@Test

public void testIndex()throws Exception{

IndexResponse response =client.prepareIndex("twitter", "tweet", "1")

.setSource(XContentFactory.jsonBuilder()

.startObject()

.field("user", "kimchy")

.field("postDate", new Date())

.field("message", "trying out Elasticsearch")

.endObject()

)

.get();

System.out.println("索引名称："+response.getIndex());

System.out.println("类型："+response.getType());

System.out.println("文档ID："+response.getId()); // 第一次使用是1

System.out.println("当前实例状态："+response.status());

}

/**

* 添加索引

*/

@Test

public void testIndex2()throws Exception{

String json = "{" +

"\"user\":\"kimchy\"," +

"\"postDate\":\"2013-01-30\"," +

"\"message\":\"trying out Elasticsearch\"" +

"}";

IndexResponse response =client.prepareIndex("weibo", "tweet")

.setSource(json,XContentType.JSON)

.get();

System.out.println("索引名称："+response.getIndex());

System.out.println("类型："+response.getType());

System.out.println("文档ID："+response.getId()); // 第一次使用是1

System.out.println("当前实例状态："+response.status());

}

/**

* 添加索引

*/

@Test

public void testIndex3()throws Exception{

Map<String, Object> json = new HashMap<String, Object>();

json.put("user","kimchy");

json.put("postDate",new Date());

json.put("message","trying out Elasticsearch");

IndexResponse response =client.prepareIndex("qq", "tweet")

.setSource(json)

.get();

System.out.println("索引名称："+response.getIndex());

System.out.println("类型："+response.getType());

System.out.println("文档ID："+response.getId()); // 第一次使用是1

System.out.println("当前实例状态："+response.status());

}

/**

* 添加索引

*/

@Test

public void testIndex4()throws Exception{

JsonObject jsonObject=new JsonObject();

jsonObject.addProperty("user", "kimchy");

jsonObject.addProperty("postDate", "1989-11-11");

jsonObject.addProperty("message", "trying out Elasticsearch");

IndexResponse response =client.prepareIndex("qq", "tweet")

.setSource(jsonObject.toString(),XContentType.JSON)

.get();

System.out.println("索引名称："+response.getIndex());

System.out.println("类型："+response.getType());

System.out.println("文档ID："+response.getId()); // 第一次使用是1

System.out.println("当前实例状态："+response.status());

}