springboot+ElasticSearch8开发，实现简单查询
第一次用springboot连接es8，先用了springboot自带的jar做连接，结果失败了，后来才知道es7以后就不支持template的连接方式，自己踩了不少坑，这里参考官方的api做了一个demo，供各位大佬参考，有哪里不对的欢迎各路大神批评指正
api地址：
Connecting | Elasticsearch Java API Client [8.1] | Elastic
版本说明：
springboot：2.1.8-RELEASE
ElasticSearch: 8.1(非集群)
JDK: 1.8
开始代码
springboot和ElasticSearch搭建步骤就省略了
maven依赖：
springboot的2.1.8-RELEASE版本不支持8.1版本的es，因此直接使用官方推荐的maven依赖包
co.elastic.clients
elasticsearch-java
8.1.2
org.elasticsearch.client
elasticsearch-rest-client
8.1.2
org.glassfish
jakarta.json
2.0.1
配置yml：
因为后面要自己写代码连接es，这里配置自己加了一些东西，es再搭建的时候设置了登陆认证
spring:
elasticsearch:
rest:
# 是否启用es
enable: false
uris: 127.0.0.1:9200
host: 127.0.0.1
port: 9200
username: elastic
password: 123456连接es配置文件:
@Configuration
public class ElasticSearchConfig {
@Value("${spring.elasticsearch.rest.host}")
private String host;
@Value("${spring.elasticsearch.rest.enable:true}")
private boolean enable;
@Value("${spring.elasticsearch.rest.port}")
private int port;
@Value("${spring.elasticsearch.rest.username}")
private String userName;
@Value("${spring.elasticsearch.rest.password}")
private String passWord;
//注入IOC容器
@Bean
public ElasticsearchClient elasticsearchClient(){
ElasticsearchClient client = new ElasticsearchClient(null);
if (enable){
final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
//设置账号密码
credentialsProvider.setCredentials(
AuthScope.ANY, new UsernamePasswordCredentials(userName, passWord));
// RestClients restClients =
RestClient restClient = RestClient.builder(new HttpHost(host, port))
.setHttpClientConfigCallback(httpClientBuilder->httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider)).build();
ElasticsearchTransport transport = new RestClientTransport(restClient,new JacksonJsonpMapper());
// And create the API client
client = new ElasticsearchClient(transport);
}
return client;
}
}这时候可以启动代码监控下日志，看是否连接成功es
开发查询接口
新增对象
业务对象实体：
@Data
@Accessors(chain = true)
public class HdiotDecodeDTO {
private String appid;
private String pid;
private String drvid;
private String map_devid;
private String pcode;
private String protocol;
private String devid;
private String sn;
private String imei;
private String messageid;
private Object data;
private String session;
private Date created;
private Date changed;
@Override
public String toString() {
return "HdiotDecodeBean{" +
"appid='" + appid + '\'' +
", pid='" + pid + '\'' +
", drvid='" + drvid + '\'' +
", devid='" + devid + '\'' +
", sn='" + sn + '\'' +
", imei='" + imei + '\'' +
", messageid='" + messageid + '\'' +
", data=" + data +
", session='" + session + '\'' +
", created=" + created +
", changed=" + changed +
'}';
}
}
查询对象实体：
@Data
public class EsQueryDTO {
@ApiModelProperty("索引名称")
private String indexName;
@ApiModelProperty("关键字属性")
private String field;
@ApiModelProperty("关键字")
private String word;
@ApiModelProperty("起始行")
private Integer from;
@ApiModelProperty("页数")
private Integer size;
public Integer getSize() {
return size==0?30:size;
}
}新增查询工具类
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch.core.CountResponse;
import co.elastic.clients.elasticsearch.core.GetResponse;
import co.elastic.clients.elasticsearch.core.SearchResponse;
import co.elastic.clients.elasticsearch.core.search.Hit;
import com.alibaba.fastjson.JSON;
import com.hdkj.hdiot.configure.common.PageData;
import com.hdkj.hdiot.configure.es.bean.EsQueryDTO;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.poi.ss.formula.functions.T;
import java.io.IOException;
import java.util.*;
/**
* @author liuch
* @title: ElasticClientUtils
* @description: TODO
* @date 2022/4/2 9:50
*/
public class ElasticClientUtils {
/**
* @author liuch
* @description 根据关键字分页查询
* @date 2022/4/2 17:15
* @param
* @param client
* @param dto
* @param target
* @return java.util.List
*/
public List queryByFiled(ElasticsearchClient client, EsQueryDTO dto,Class target) throws Exception {
List result = new ArrayList<>();
SearchResponse search = client.search(s -> s
.index(dto.getIndexName())
.query(q -> q.term(t -> t
.field(dto.getField())
.value(dto.getWord())
)).from(dto.getFrom()).size(dto.getSize()),
HashMap.class);
List> hits = search.hits().hits();
Iterator> iterator = hits.iterator();
while (iterator.hasNext()){
Hit decodeBeanHit = iterator.next();
Map docMap = decodeBeanHit.source();
String json = JSON.toJSONString(docMap);
T obj = JSON.parseObject(json,target);
result.add(obj);
}
return result;
}
/**
* @author liuch
* @description 根据关键字查询总条数
* @date 2022/4/2 17:15
* @param
* @param client
* @param dto
* @return long
*/
public long queryCountByFiled(ElasticsearchClient client, EsQueryDTO dto) throws Exception {
CountResponse count = client.count(c -> c.index(dto.getIndexName()).query(q -> q.term(t -> t
.field(dto.getField())
.value(dto.getWord())
)));
long total = count.count();
return total;
}
/**
* @author liuch
* @description 查询分页信息
* @date 2022/4/2 17:16
* @param
* @param client
* @param dto
* @param target
* @return com.hdkj.hdiot.configure.common.PageData
*/
public PageData queryPageByFiled(ElasticsearchClient client, EsQueryDTO dto,Class target) throws Exception {
long total = queryCountByFiled(client,dto);
List result = queryByFiled(client,dto,target);
PageData pageData = new PageData<>(result,total);
return pageData;
}
/**
* @author liuch
* @description 根据文档id查询
* @date 2022/4/2 17:16
* @param
* @param client
* @param dto
* @param target
* @return java.lang.Object
*/
public Object queryByDocumentId(ElasticsearchClient client, EsQueryDTO dto,Class target) throws Exception {
GetResponse getResponse = client.get(s -> s
.index(dto.getIndexName()).id(dto.getWord()),
HashMap.class);
getResponse.source();
Map docMap = getResponse.source();
String json = JSON.toJSONString(docMap);
T obj = JSON.parseObject(json,target);
return obj;
}
}
新增查询service
public interface HdiotDecodeService {
Result getDecodeMsg(EsQueryDTO dto);
}实现类：
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import com.hdkj.hdiot.configure.common.PageData;
import com.hdkj.hdiot.configure.common.Result;
import com.hdkj.hdiot.configure.es.bean.EsQueryDTO;
import com.hdkj.hdiot.configure.es.bean.HdiotDecodeDTO;
import com.hdkj.hdiot.configure.es.bean.HdiotOriginalDTO;
import com.hdkj.hdiot.configure.es.service.HdiotDecodeService;
import com.hdkj.hdiot.configure.es.utils.ElasticClientUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* @author liuch
* @title: HdiotDecodeServiceImpl
* @description: TODO
* @date 2022/4/1 11:39
*/
@Service
public class HdiotDecodeServiceImpl implements HdiotDecodeService {
@Autowired
private ElasticsearchClient client;
/**
* @author liuch
* @description 查询原始数据
* @date 2022/4/2 10:56
* @param
* @param dto
* @return com.hdkj.hdiot.configure.common.Result
*/
@Override
public Result getDecodeMsg(EsQueryDTO dto) {
// decode_data origin_data
try {
dto.setIndexName("decode_data");
dto.setField("devid");
PageData pageData = new ElasticClientUtils().queryPageByFiled(client,dto,HdiotDecodeDTO.class);
return new Result().ok(pageData);
} catch (Exception e) {
e.printStackTrace();
return new Result().error(e.getMessage());
}
}
}
新增查询接口
@Autowired
HdiotDecodeService decodeService;
@PostMapping(value = "/decodeMsg")
public Result getDecodeMsg(@RequestBody EsQueryDTO dto){
return decodeService.getDecodeMsg(dto);
}