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1.以下是封装了ES常用的基本方法,可以用来做一些简单的测试。
如:获取ES的TransportClient/IndicesAdminClient、判定索引是否存在、创建索引、设置mapping、删除索引、插入文档。
package com.bas.util;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexResponse;
import org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsResponse;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.IndicesAdminClient;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
* ES工具类
*/
public class ESUtil {
//集群名,默认值elasticsearch
private static final String CLUSTER_NAME = "TestCluster";
//ES集群中某个节点
private static final String HOSTNAME = "localhost";
//连接端口号
private static final int TCP_PORT = 9300;
//构建Settings对象
private static Settings settings = Settings.builder().put("cluster.name", CLUSTER_NAME).build();
//TransportClient对象,用于连接ES集群
private static volatile TransportClient client;
/**
* 同步synchronized(*.class)代码块的作用和synchronized static方法作用一样,
* 对当前对应的*.class进行持锁,static方法和.class一样都是锁的该类本身,同一个监听器
* @return
* @throws UnknownHostException
*/
public static TransportClient getClient(){
if(client==null){
synchronized (TransportClient.class){
try {
client=new PreBuiltTransportClient(settings)
.addTransportAddress(new TransportAddress(InetAddress.getByName(HOSTNAME), TCP_PORT));
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
}
return client;
}
/**
* 获取索引管理的IndicesAdminClient
*/
public static IndicesAdminClient getAdminClient() {
return getClient().admin().indices();
}
/**
* 判定索引是否存在
* @param indexName
* @return
*/
public static boolean isExists(String indexName){
IndicesExistsResponse response=getAdminClient().prepareExists(indexName).get();
return response.isExists()?true:false;
}
/**
* 创建索引
* @param indexName
* @return
*/
public static boolean createIndex(String indexName){
CreateIndexResponse createIndexResponse = getAdminClient()
.prepareCreate(indexName.toLowerCase())
.get();
return createIndexResponse.isAcknowledged()?true:false;
}
/**
* 创建索引
* @param indexName 索引名
* @param shards 分片数
* @param replicas 副本数
* @return
*/
public static boolean createIndex(String indexName, int shards, int replicas) {
Settings settings = Settings.builder()
.put("index.number_of_shards", shards)
.put("index.number_of_replicas", replicas)
.build();
CreateIndexResponse createIndexResponse = getAdminClient()
.prepareCreate(indexName.toLowerCase())
.setSettings(settings)
.execute().actionGet();
return createIndexResponse.isAcknowledged()?true:false;
}
/**
* 为索引indexName设置mapping
* @param indexName
* @param typeName
* @param mapping
*/
public static void setMapping(String indexName, String typeName, String mapping) {
getAdminClient().preparePutMapping(indexName)
.setType(typeName)
.setSource(mapping, XContentType.JSON)
.get();
}
/**
* 删除索引
* @param indexName
* @return
*/
public static boolean deleteIndex(String indexName) {
DeleteIndexResponse deleteResponse = getAdminClient()
.prepareDelete(indexName.toLowerCase())
.execute()
.actionGet();
return deleteResponse.isAcknowledged()?true:false;
}
/**
* 插入文档
* @param indexName 索引名
* @param type 类型
* @param doc XContentBuilder
*/
public static void insertDocument(String indexName, String type, XContentBuilder doc) {
IndexResponse response = getClient().prepareIndex(indexName, type)
.setSource(doc)
.get();
System.out.println(response.status());
}
/**
* 插入文档
* @param indexName 索引名
* @param type 类型
* @param json Json格式串
*/
public static void insertDocument(String indexName, String type, String json) {
IndexResponse response = getClient().prepareIndex(indexName, type)
.setSource(json, XContentType.JSON)
.get();
System.out.println(response.status());
}
}
2.结合ESUtil.java ,来做一些测试。首先是创建type为"blog"的Mapping,运行CreateDemo.test():
package com.bas.demo;
import com.bas.util.ESUtil;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.client.IndicesAdminClient;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.junit.jupiter.api.Test;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
public class CreateDemo {
/**
* 创建Index
* @param args
* @throws UnknownHostException
*/
public static void main(String[] args) throws UnknownHostException {
//1.设置集群名称
Settings settings = Settings.builder().put("cluster.name", "TestCluster").build();
//2.创建client
TransportClient client = new PreBuiltTransportClient(settings)
.addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300));
//3.获取IndicesAdminClient对象
IndicesAdminClient indicesAdminClient = client.admin().indices();
//4.创建索引
CreateIndexResponse ciReponse=indicesAdminClient.prepareCreate("app_account").get();
System.out.println(ciReponse.isAcknowledged());
}
/**
* 创建Mapping
*/
@Test
public void test(){
try {
XContentBuilder builder = jsonBuilder()
.startObject()
.startObject("properties")
.startObject("id")
.field("type", "long")
.endObject()
.startObject("title")
.field("type", "text")
.field("analyzer", "ik_max_word")
.field("search_analyzer", "ik_max_word")
.field("boost", 2)
.endObject()
.startObject("content")
.field("type", "text")
.field("analyzer", "ik_max_word")
.field("search_analyzer", "ik_max_word")
.endObject()
.startObject("postdate")
.field("type", "date")
.field("format", "yyyy-MM-dd HH:mm:ss")
.endObject()
.startObject("url")
.field("type", "keyword")
.endObject()
.endObject()
.endObject();
System.out.println(builder.string());
ESUtil.setMapping("app_account", "blog", builder.string());
} catch (IOException e) {
e.printStackTrace();
}
}
}
、3.接下来,以两种方式插入文档到blog:
package com.bas.demo;
import com.bas.util.ESUtil;
import org.elasticsearch.common.xcontent.XContentBuilder;
import java.io.IOException;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
public class InsertDemo {
public static void main(String[] args) throws IOException {
// 方式一
String json = "{" +
"\"id\":\"1\"," +
"\"title\":\"Java連接ES\"," +
"\"content\":\"abcdefg。\"," +
"\"postdate\":\"2019-03-24 14:38:00\"," +
"\"url\":\"bas.com\"" +
"}";
System.out.println(json);
ESUtil.insertDocument("app_account", "blog", json);
// 方式二
XContentBuilder doc = jsonBuilder()
.startObject()
.field("id","2")
.field("title","Java插入数据到ES")
.field("content","abcedfasdasd")
.field("postdate","2019-03-24 14:38:00")
.field("url","bas.com")
.endObject();
ESUtil.insertDocument("app_account", "blog", doc);
}
}
结果如图: