Java操作ElasticSearch之创建客户端连接

时间:2021-07-31 03:37:58

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());
    }
     
}