Java操作ElasticSearch之创建客户端连接

Java操作ElasticSearch之创建客户端连接

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

Java操作ElasticSearch之创建客户端连接

 

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());

    }

     

}