Spring boot + elasticsearch的最简单实践

之所以说是最简单，是因为这样能搭建出一个能跑出来结果的框架，而更高级的功能往往就是在最简单的框架的基础上建设的，对吧。

客户端环境：spring boot 1.4.1

ElasticSearch环境：Elasticsearch2.4.0 on Windows 2008R2 100.2.92.100:9300

POM：

    4.0.0

    miku.ltd
    esl
    1.0-SNAPSHOT

    
        org.springframework.boot
        spring-boot-starter-parent
        1.4.1.RELEASE
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter
        
        
            org.springframework.boot
            spring-boot-starter-data-elasticsearch
        
        
            org.springframework.data
            spring-data-elasticsearch
            2.0.4.RELEASE
        
    

为了更简单的在spring boot中使用es，直接依赖spring-boot-starter-data-elasticsearch就可以了。

application.properties

server.port=12001
logging.level.org.springframework=INFO
spring.data.elasticsearch.cluster-name=elasticsearch
spring.data.elasticsearch.cluster-nodes=100.2.92.100:9300
spring.data.elasticsearch.local=false
spring.data.elasticsearch.repositories.enabled=true

AppMain.java

package ltd.miku.esl;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;

@SpringBootApplication
//@EnableElasticsearchRepositories(basePackages = {"ltd.miku.esl.dao"})
public class AppMain implements CommandLineRunner
{
    public static ConfigurableApplicationContext ctx;

    private static final Logger LOG = LoggerFactory.getLogger(AppMain.class);

    @Override
    public void run(String... strings) throws Exception
    {

    }

    public static void main(String[] args)
    {
        ctx = SpringApplication.run(AppMain.class, args);
        LOG.info(" application running...");

    }

}

EslController.java

package ltd.miku.esl.controller;

import ltd.miku.esl.service.EslService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(value = "/esl/")
public class EslController
{
    @Autowired
    private EslService esl;

    private static final Logger LOG = LoggerFactory.getLogger(EslController.class);

    @RequestMapping(value = "test", method = RequestMethod.POST)
    public Object test(@RequestBody String id)
    {
        return esl.findCliente(id);
    }
}

ClienteRepository.java

package ltd.miku.esl.dao;

import ltd.miku.esl.model.Cliente;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;

public interface ClienteRepository extends ElasticsearchRepository
{
}

跟JPA或者mongo的DAO差不多是一样的。

Cliente.java

package ltd.miku.esl.model;

import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;

/**
 * the bean of customer
 */
@Document(indexName = "customer", type = "external", shards = 1, replicas = 0, refreshInterval = "-1")
public class Cliente
{
    @Id
    private String id;

    private long account_number;

    private long balance;

    private String firstname;

    private String lastname;

    private int age;

    private String gender;

    private String address;

    private String employer;

    private String email;

    private String city;

    private String state;

    public String getId()
    {
        return id;
    }

    public void setId(String id)
    {
        this.id = id;
    }

    public long getAccount_number()
    {
        return account_number;
    }

    public void setAccount_number(long account_number)
    {
        this.account_number = account_number;
    }

    public long getBalance()
    {
        return balance;
    }

    public void setBalance(long balance)
    {
        this.balance = balance;
    }

    public String getFirstname()
    {
        return firstname;
    }

    public void setFirstname(String firstname)
    {
        this.firstname = firstname;
    }

    public String getLastname()
    {
        return lastname;
    }

    public void setLastname(String lastname)
    {
        this.lastname = lastname;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }

    public String getGender()
    {
        return gender;
    }

    public void setGender(String gender)
    {
        this.gender = gender;
    }

    public String getAddress()
    {
        return address;
    }

    public void setAddress(String address)
    {
        this.address = address;
    }

    public String getEmployer()
    {
        return employer;
    }

    public void setEmployer(String employer)
    {
        this.employer = employer;
    }

    public String getEmail()
    {
        return email;
    }

    public void setEmail(String email)
    {
        this.email = email;
    }

    public String getCity()
    {
        return city;
    }

    public void setCity(String city)
    {
        this.city = city;
    }

    public String getState()
    {
        return state;
    }

    public void setState(String state)
    {
        this.state = state;
    }

    @Override
    public String toString()
    {
        return "Cliente{" + "id='" + id + '\'' + ", account_number=" + account_number + ", balance=" + balance + ", firstname='" + firstname + '\'' + ", lastname='" + lastname + '\'' + ", age=" + age + ", gender='" + gender + '\'' + ", address='" + address + '\'' + ", employer='" + employer + '\'' + ", email='" + email + '\'' + ", city='" + city + '\'' + ", state='" + state + '\'' + '}';
    }
}

EslService.java

package ltd.miku.esl.service;

import ltd.miku.esl.model.Cliente;

public interface EslService
{
    Cliente findCliente(String id);
}

EslServiceImpl.java

package ltd.miku.esl.service.impl;

import ltd.miku.esl.dao.ClienteRepository;
import ltd.miku.esl.model.Cliente;
import ltd.miku.esl.service.EslService;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class EslServiceImpl implements EslService
{
    @Autowired
    private ClienteRepository clienteDao;

    private static final org.slf4j.Logger LOG = LoggerFactory.getLogger(EslServiceImpl.class);

    @Override
    public Cliente findCliente(String id)
    {

        Cliente cliente = clienteDao.findOne(id);
        LOG.info(" get cliente by id {} is {}", id, cliente);
        return cliente;
    }
}

执行结果：

记录问题：

1，在开发环境搭建的过程中，总是报错：

Field clienteDao in ltd.miku.esl.service.impl.EslServiceImpl required a bean named 'elasticsearchTemplate' that could not be found

然后看看代码和POM，貌似配置也没问题，后来发现了maven依赖有问题：

spring-data-elasticsearch-2.0.4.RELEASE.jar里点名的依赖是2.2.0，但是idea的依赖中说缺少2.4.0

虽然不知道为啥但是在私服中加上2.4.0版本的就好用了。

2，早起开发的时候一直遇到连接不到ES节点的异常，但是用ES服务器的9200端口进行http访问就能正常连接，异常信息如下：

16:33:54.196 [elasticsearch[Shuma-Gorath][generic][T#2]] INFO  org.elasticsearch.client.transport.internalInfo:124 - [Shuma-Gorath] failed to get node info for [#transport#-1][clauspc][inet[/100.2.92.100:9300]], disconnecting...
org.elasticsearch.transport.NodeDisconnectedException: [][inet[/100.2.92.100:9300]][cluster:monitor/nodes/info] disconnected
16:33:59.221 [elasticsearch[Shuma-Gorath][generic][T#2]] INFO  org.elasticsearch.client.transport.internalInfo:124 - [Shuma-Gorath] failed to get node info for [#transport#-1][clauspc][inet[/100.2.92.100:9300]], disconnecting...
org.elasticsearch.transport.NodeDisconnectedException: [][inet[/100.2.92.100:9300]][cluster:monitor/nodes/info] disconnected
16:34:04.245 [elasticsearch[Shuma-Gorath][generic][T#2]] INFO  org.elasticsearch.client.transport.internalInfo:124 - [Shuma-Gorath] failed to get node info for [#transport#-1][clauspc][inet[/100.2.92.100:9300]], disconnecting...
org.elasticsearch.transport.NodeDisconnectedException: [][inet[/100.2.92.100:9300]][cluster:monitor/nodes/info] disconnected

原因是Spring boot elasticsearch的版本跟100.2.92.100上的es版本相差太多导致的，升级spring的es版本为2.4.1就可以了。