ElasticSearch 5.x Java API

1、添加数据

（1）创建Index

[root@node3 ~]# curl -X PUT 'node3:9200/accounts'
{"acknowledged":true,"shards_acknowledged":true,"index":"accounts"}
[root@node3 ~]# 

（2）插入数据

[[e-mail] conf]# curl -X PUT 'node3:9200/accounts/person/1' -d '
> {
>   "user": "张三",
>   "title": "工程师",
>   "desc": "数据库管理"
> }' 
{"_index":"accounts","_type":"person","_id":"1","_version":1,"result":"created","_shards":{"total":2,"successful":2,"failed":0},"created":true}
[[e-mail] conf]# 

（3）检索数据

[root@node3 ~]# curl -X GET 'node3:9200/accounts'
{"accounts":{"aliases":{},"mappings":{"person":{"properties":{"desc":{"type":"text","fields":{"keyword":{"type":"keyword","ignore_above":256}}},"title":{"type":"text","fields":{"keyword":{"type":"keyword","ignore_above":256}}},"user":{"type":"text","fields":{"keyword":{"type":"keyword","ignore_above":256}}}}}},"settings":{"index":{"creation_date":"1513147834226","number_of_shards":"5","number_of_replicas":"1","uuid":"V4763Q5FRcm10hbWHcD6lg","version":{"created":"5060399"},"provided_name":"accounts"}}}}[root@node3 ~]# 

2、创建Maven项目

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.hadron</groupId>
    <artifactId>elasticSearch</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>elasticSearch</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <elasticsearch.version>5.6.3</elasticsearch.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.elasticsearch.client/transport -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>5.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.7</version>
        </dependency>
    </dependencies>
</project>

说明：实际上我使用的ES版本是5.6.5的，官网https://www.elastic.co/guide/en/x-pack/5.6/api-java.html建议使用

<repositories>
      <!-- add the elasticsearch repo -->
      <repository>
         <id>elasticsearch-releases</id>
         <url>https://artifacts.elastic.co/maven</url>
         <releases>
            <enabled>true</enabled>
         </releases>
         <snapshots>
            <enabled>false</enabled>
         </snapshots>
      </repository>
      ...
   </repositories>
   ...

   <dependencies>
      <!-- add the x-pack jar as a dependency -->
      <dependency>
         <groupId>org.elasticsearch.client</groupId>
         <artifactId>x-pack-transport</artifactId>
         <version>5.6.5</version>
      </dependency>
      ...
   </dependencies>

由于网络问题，这个自定义的Maven创库不能访问。

只好改用

<dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>5.1.1</version>
</dependency>

3、Java API测试程序

package cn.hadron.elasticSearch;

import java.net.InetAddress;
import org.elasticsearch.action.get.GetResponse;
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 Demo {

    public static void main(String[] args) {
        try {

            // 设置集群名称
            Settings settings = Settings.builder().put("cluster.name", "my cluster").build();
            // 创建client
            TransportClient client = new PreBuiltTransportClient(settings)
                    .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("192.168.1.161"), 9300));
            // 搜索数据
            GetResponse response = client.prepareGet("accounts", "person", "1").execute().actionGet();
            // 输出结果
            System.out.println(response.getSourceAsString());
            // 关闭client
            client.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

运行结果