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)
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());
}
} |