java创建es索引,二、ElasticSearch 使用java接口创建索引及操作文档
ElasticSearch (2)使用java接口创建索引及操作文档
所有Elasticsearch操作都是使用Client对象执行的。Client 定义的所有API都是异步执行的(要么使用事件监听器回调或者使用Future模式)。此外，客户端上的操作可以批量累积和执行。
Elasticsearch官方计划在Elasticsearch 7.0中弃TransportClient，并在8.0中完全删除它。故，应该使用Java高级REST client，rest client执行HTTP请求来执行操作，无需再序列化的Java请求。Java高级REST Client API目前支持更常用的api，但还需要添加更多的api。
1、连接ElasticSearch
新建一个maven项目，在pom.xml文件中添加依赖： (注意版本对应)
org.elasticsearch.client
transport
5.5.2
com.google.code.gson
gson
2.8.2
连接的代码：
package com.asiainfo.test;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import java.net.InetAddress;
public class ConnTest {
// elasticsearch的端口和ip
private static String host = "10.21.13.48";
private static int port = 9300;
public static void main(String[] args) throws Exception {
@SuppressWarnings({ "resource", "unchecked" })
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), port));
System.out.println(client);
client.close();
}
}
输出：
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...
org.elasticsearch.transport.client.PreBuiltTransportClient@783f6c
前面的 ERROR 是没有配置 Log4j2 的问题。
2、创建索引、并操作文档
import com.google.gson.JsonObject;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
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 java.net.InetAddress;
/**
* @author: LIJY
* @Description: ElasticSearch客户端连接服务器测试
* @Date: 2020/9/25 21:26
*/
public class IndexTest {
private static String host = "10.21.13.48";
private static int port = 9300;
private TransportClient client = null;
/**
* 获取连接
* @throws Exception
*/
@SuppressWarnings({"resource", "unchecked"})
@Before
public void getClient() throws Exception {
client = new PreBuiltTransportClient(Settings.EMPTY)
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), port));
}
/**
* 关闭连接
*/
@After
public void close() {
if (client != null) {
client.close();
}
}
/**
* 创建索引、 添加文档
* @throws Exception
*/
@Test
public void testIndex() throws Exception {
JsonObject object = new JsonObject();
object.addProperty("name", "java think");
object.addProperty("price", 100.0);
object.addProperty("date", "2015-09-14");
IndexResponse indexResponse = client.prepareIndex("book", "java", "1")
.setSource(object.toString(), XContentType.JSON).get();
System.out.println("索引名称：" + indexResponse.getIndex());
System.out.println("类型：" + indexResponse.getType());
System.out.println("文档ID：" + indexResponse.getId());
System.out.println("当前实例状态：" + indexResponse.status());
}
/**
* 根据id获取文档
* ElasticSearch提供了根据索引名称，类别，文档ID来获取数据
* @throws Exception
*/
@Test
public void testGet() throws Exception {
GetResponse fields = client.prepareGet("book", "java", "1").get();
System.out.println(fields.getSourceAsString());
}
/**
* 根据id修改文档
* ElasticSearch提供了根据索引名称，类别，文档ID来修改数据，修改的设置数据可以是Map，Json串，自带工具。
* 实际开发一般用Json
* @throws Exception
*/
@Test
public void testUpdate() throws Exception {
JsonObject object = new JsonObject();
object.addProperty("name", "python doc");
object.addProperty("price", 99.99);
object.addProperty("date", "2020-09-14");
UpdateResponse response = client.prepareUpdate("book", "java", "1")
.setDoc(object.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());
System.out.println("当前实例状态：" + response.status());
}
/**
* 根据id删除文档
* ElasticSearch提供了根据索引名称，类别，文档ID来删除数据
* @throws Exception
*/
@Test
public void testDelete() throws Exception {
DeleteResponse response = client.prepareDelete("book", "java", "1").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());
System.out.println("当前实例状态：" + response.status());
}
}