2.28. Spring boot with Elasticsearch TransportClient

2.28. Spring boot with Elasticsearch TransportClient
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Spring data 目前還不支持 Elasticsearch 5.5.x 所以需要通過注入 TransportClient 這就意味着使用 5.5.x 版本你無法使用 ElasticsearchRepository 這種特性，只能通過官方的 TransportClient 操作 Elasticsearch。

2.28.1. Maven

Elasticsearch 依賴下來四個包

			
		<dependency>
			<groupId>org.elasticsearch</groupId>
			<artifactId>elasticsearch</artifactId>
			<version>5.5.1</version>
		</dependency>
		<dependency>
			<groupId>org.elasticsearch.client</groupId>
			<artifactId>transport</artifactId>
			<version>5.5.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-api</artifactId>
			<version>2.8.2</version>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-core</artifactId>
			<version>2.8.2</version>
		</dependency>

下面是我的完整例子

			
<?xml version="1.0" encoding="UTF-8"?>
<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>com.example</groupId>
	<artifactId>api</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>api</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.3.1.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-security</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> 
			</dependency> -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
		</dependency>
		<!-- https://mvnrepository.com/artifact/javax.persistence/persistence-api -->
		<dependency>
			<groupId>javax.persistence</groupId>
			<artifactId>persistence-api</artifactId>
			<version>1.0.2</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.json/json -->
		<dependency>
			<groupId>org.json</groupId>
			<artifactId>json</artifactId>
		</dependency>
		<dependency>
			<groupId>org.elasticsearch</groupId>
			<artifactId>elasticsearch</artifactId>
			<version>5.5.1</version>
		</dependency>
		<dependency>
			<groupId>org.elasticsearch.client</groupId>
			<artifactId>transport</artifactId>
			<version>5.5.1</version>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-api</artifactId>
			<version>2.8.2</version>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>
			<artifactId>log4j-core</artifactId>
			<version>2.8.2</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-surefire-plugin</artifactId>
				<configuration>
					<skip>true</skip>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

2.28.2. Application

               
package cn.netkiller;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan
@EnableMongoRepositories
@EnableJpaRepositories
@EnableScheduling
public class Application {

       public static void main(String[] args) {
               SpringApplication.run(Application.class, args);
       }
}

2.28.3. application.properties

注意：Elasticsearch 連接地址是 9300，而不是 9200

               
spring.data.elasticsearch.cluster-nodes=172.0.0.1:9300
spring.data.elasticsearch.local=false
spring.data.elasticsearch.properties.transport.tcp.connect_timeout=60s

2.28.4. ElasticsearchConfiguration

               
package com.example.api.config;

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.elasticsearch.common.settings.Settings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;

@Configuration
public class ElasticsearchConfiguration implements FactoryBean<TransportClient>, InitializingBean, DisposableBean {
	private static final Logger logger = LoggerFactory.getLogger(ElasticsearchConfiguration.class);

	@Value("${spring.data.elasticsearch.cluster-nodes}")
	private String clusterNodes;

	private TransportClient transportClient;
	private PreBuiltTransportClient preBuiltTransportClient;

	@Override
	public void destroy() throws Exception {
		try {
			logger.info("Closing elasticSearch client");
			if (transportClient != null) {
				transportClient.close();
			}
		} catch (final Exception e) {
			logger.error("Error closing ElasticSearch client: ", e);
		}
	}

	@Override
	public TransportClient getObject() throws Exception {
		return transportClient;
	}

	@Override
	public Class<TransportClient> getObjectType() {
		return TransportClient.class;
	}

	@Override
	public boolean isSingleton() {
		return false;
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		buildClient();
	}

	protected void buildClient() {
		try {
			preBuiltTransportClient = new PreBuiltTransportClient(settings());

			String InetSocket[] = clusterNodes.split(":");
			String address = InetSocket[0];
			Integer port = Integer.valueOf(InetSocket[1]);
			transportClient = preBuiltTransportClient.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(address), port));

		} catch (UnknownHostException e) {
			logger.error(e.getMessage());
		}
	}

	/**
	 * 初始化預設的client
	 */
	private Settings settings() {
//		Settings settings = Settings.builder().put("cluster.name", clusterName).put("client.transport.sniff", true).build();
		Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();
		return settings;
	}
}

2.28.5. RestController

            
package com.example.api.restful;

import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/restful/search")
public class SearchRestController {

	@Autowired
	private TransportClient client;

	@RequestMapping(value = "/client/{articleId}")
	public GetResponse test(@PathVariable String articleId) {
		GetResponse response = client.prepareGet("information", "article", articleId).get();
		return response;
	}
}

使用 Curl 測試 restful 介面

	        
MacBook-Pro:~ neo$ curl -k https://test:test@localhost:8443/restful/search/client/1093.json
{"fields":{},"id":"1093","type":"article","source":{"@timestamp":"2017-07-31T05:41:00.248Z","author":"test","@version":"1","description":"test","ctime":"2017-07-31T05:40:35.000Z","id":1093,"source":"test","title":"test11111","content":"<p>test</p><p>aaaaaaaaaaaaaa</p>"},"version":3,"index":"information","sourceAsBytes":"eyJAdGltZXN0YW1wIjoiMjAxNy0wNy0zMVQwNTo0MTowMC4yNDhaIiwiYXV0aG9yIjoidGVzdCIsIkB2ZXJzaW9uIjoiMSIsImRlc2NyaXB0aW9uIjoidGVzdCIsImN0aW1lIjoiMjAxNy0wNy0zMVQwNTo0MDozNS4wMDBaIiwiaWQiOjEwOTMsInNvdXJjZSI6InRlc3QiLCJ0aXRsZSI6InRlc3QxMTExMSIsImNvbnRlbnQiOiI8cD50ZXN0PC9wPjxwPmFhYWFhYWFhYWFhYWFhPC9wPiJ9","sourceInternal":{"childResources":[]},"sourceAsString":"{\"@timestamp\":\"2017-07-31T05:41:00.248Z\",\"author\":\"test\",\"@version\":\"1\",\"description\":\"test\",\"ctime\":\"2017-07-31T05:40:35.000Z\",\"id\":1093,\"source\":\"test\",\"title\":\"test11111\",\"content\":\"<p>test</p><p>aaaaaaaaaaaaaa</p>\"}","sourceEmpty":false,"sourceAsMap":{"@timestamp":"2017-07-31T05:41:00.248Z","author":"test","@version":"1","description":"test","ctime":"2017-07-31T05:40:35.000Z","id":1093,"source":"test","title":"test11111","content":"<p>test</p><p>aaaaaaaaaaaaaa</p>"},"exists":true,"sourceAsBytesRef":{"childResources":[]},"fragment":false}

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