SpringBoot -- 集成Elasticsearch

前置工作

• 當前服務器爲CentOS6.5+ 64bit

• 新建 elasticsearch用戶，ES無法用root啓動

• useradd -d /usr/elasticsearch -g elastic -m elasticsearch

獲取elasticsearch，本文用的v2.3.4 找到要獲取的版本

• ES已經有5.x版本,然而Spring data目前還只支持ES2.x版本，Springdata支持ES版本說明

瞭解ES與mysql的對應關係

• index –> DB
  
• type –> Table
  
• Document –> row

安裝Elasticsearch

用wget命令 獲取elasticsearch後，直接解壓到對應的目錄中

修改 config下的elasticsearch.yml
配置 cluster.name、network.host

cluster.name:nini
network.host 0.0.0.0 #爲任意都可連接

啓動ES,bin目錄下

sh elasticsearch

Springboot集成ES

新建ES module，引入 spring-boot-starter-data-elasticsearch、spring-data-elasticsearch

build.gradle

apply plugin: 'org.springframework.boot'

dependencyManagement{
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:" + springCloudVersion
        mavenBom "org.springframework.boot:spring-boot-starter:"+ springBootVersion
    }
}

repositories {
    mavenCentral()
}

dependencies {

    compile ('org.springframework.data:spring-data-redis')
    compile ('org.springframework.boot:spring-boot-starter-data-mongodb:'+springBootVersion)
    compile ('org.springframework.boot:spring-boot-starter-web:'+springBootVersion)
    compile('org.springframework.cloud:spring-cloud-starter-eureka')
    compile ('mysql:mysql-connector-java:'+mysqlVersion)
    compile ('com.alibaba:druid:'+druidVersion)
    compile ('org.mybatis:mybatis-spring:'+mybatisSpringBootVersion)
    compile ('org.mybatis:mybatis:'+mybatisVersion)
    compile('org.springframework.boot:spring-boot-starter-log4j2')
    compile ('org.springframework.boot:spring-boot-starter-thymeleaf')
    compile ('net.sourceforge.nekohtml:nekohtml:'+nekoHtmlVersion)
    compile('org.apache.logging.log4j:log4j-1.2-api:'+ log4jAPIVersion)
    compile('org.springframework.boot:spring-boot-starter-jdbc')
    compile('org.springframework.boot:spring-boot-starter-aop')
    compile ('com.alibaba:fastjson:'+fastjsonVersion)
    compile ('redis.clients:jedis')
    compile ('org.springframework.boot:spring-boot-starter-data-elasticsearch:'+springBootVersion)
    compile ('org.springframework.data:spring-data-elasticsearch')

    testCompile ('org.springframework.boot:spring-boot-starter-test')
    testCompile group: 'junit', name: 'junit', version: '4.11'
}

configurations {
    all*.exclude module: 'spring-boot-starter-logging'
    all*.exclude module: 'logback-classic'
    all*.exclude module: 'log4j-over-slf4j'
    all*.exclude module: 'snappy-java'
}

jar {
    baseName = 'es-server-bootcwenao'
}

在application.yml中配置ES信息

application.yml

spring:
    data:
        elasticsearch:
            cluster-name: nini
            cluster-nodes: 192.168.21.1:9300
            local: false
            repositories:
                enable: true

創建 ES bean

用來查詢獲取對象，與mybatis差不多，唯獨多了@Document與@Id 註解

AccountInfo.java

/**
 * @author cwenao
 * @version $Id AccountInfo.java, v 0.1 2017-02-06 10:28 cwenao Exp $$
 */
@Document(indexName = "cwenao",type = "accountinfo", shards = 1,replicas = 0, refreshInterval = "-1")
public class AccountInfo {

    @Id
    private String id;
    @Field
    private String accountName;
    @Field
    private String nickName;

    //getter setter ...
}

創建 Repository

用於數據查詢，需要extends ElasticsearchRepository

ElasticAccountInfoRepository.java

/**
 * @author cwenao
 * @version $Id ElasticAccountInfoRepository.java, v 0.1 2017-02-06 10:26 cwenao Exp $$
 */
@Component("elasticAccountInfoRepository")
public interface ElasticAccountInfoRepository extends ElasticsearchRepository<AccountInfo,String> {
    //TODO define the search
    AccountInfo findByAccountName(String accountName);
}

創建 service

ESAccountInfoService.java

/**
 * @author cwenao
 * @version $Id ESAccountInfoService.java, v 0.1 2017-02-06 10:36 cwenao Exp $$
 */
public interface ESAccountInfoService {

    AccountInfo queryAccountInfoById(String id);

    AccountInfo queryAccountInfoByName(String accountName);
}

ESAccountInfoServiceImpl.java

/**
 * @author cwenao
 * @version $Id ESAccountInfoServiceImpl.java, v 0.1 2017-02-06 10:38 cwenao Exp $$
 */
@Service("esAccountInfoServiceImpl")
public class ESAccountInfoServiceImpl implements ESAccountInfoService {

    @Autowired
    private ElasticAccountInfoRepository elasticAccountInfoRepository;

    public AccountInfo queryAccountInfoById(String id) {
        return elasticAccountInfoRepository.findOne(id);
    }

    @Override
    public AccountInfo queryAccountInfoByName(String accountName) {
        return elasticAccountInfoRepository.findByAccountName(accountName);
    }
}

創建controller

ESController.java

/**
 * @author cwenao
 * @version $Id ESController.java, v 0.1 2017-02-06 10:44 cwenao Exp $$
 */
@Controller
public class ESController {

    @Autowired
    private ESAccountInfoService esAccountInfoServiceImpl;

    @RequestMapping("/esAccountInfo")
    public String queryAccountInfo(String id, ModelMap modelMap){

        AccountInfo accountInfo = esAccountInfoServiceImpl.queryAccountInfoById(id);
        modelMap.addAttribute("esAccountInfo",accountInfo);
        modelMap.addAttribute("test_elastic","Test the elasticsearch");

        return "accountInfo";
    }

    @RequestMapping("/esAccountInfoName")
    public String queryAccountInfoByAccountName(String accountName, ModelMap modelMap){

        AccountInfo accountInfo = esAccountInfoServiceImpl.queryAccountInfoByName(accountName);
        modelMap.addAttribute("esAccountInfo",accountInfo);
        modelMap.addAttribute("test_elastic","Test the elasticsearch");

        return "accountInfo";
    }
}

在apigateway工程配置path

bootstrap.yml

zuul:
  routes:
    esserver:
      path: /esserver/**
      serviceId: ESSERVER

apigateway/mybatis 等集成參考前面文章

測試

• 依次啓動 discovery、configserver、apigateway、esserver
• 訪問 http://localhost:10002/esserver/esAccountInfo?id=a63126d074f04db587cd76a48c817510

更多的查詢方式

• ElasticsearchRepository提供了很有用的查詢構造器
• 比如查詢 去重distinct ： findDistinctAccountInfoById(String id)
• 比如條件組合 **AND/OR : findAccountInfoByIdAndAccountname(String id,accountname)
• 查詢構造器會忽略 find..By 等前綴

---

代碼

代碼請移步 Github參考地址

如有疑問請加公衆號（K171），如果覺得對您有幫助請 github start