全文检索工具elasticsearch：第三章： Java程序中的应用

搭建模块

创建二个项目

gmall-list-service的appliction.properties:

server.port=8073
spring.datasource.url=jdbc:mysql://localhost:3306/gmall?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=rootmybatis.configuration.map-underscore-to-camel-case=true
mybatis.mapper-locations=classpath:mapper/*Mapper.xmlspring.dubbo.registry.protocol=zookeeper
spring.dubbo.registry.address=192.168.0.100:2181spring.dubbo.application.name=gmall-list-service
spring.dubbo.protocol.name=dubbo
spring.dubbo.base-package=com.javawxidspring.elasticsearch.jest.uris=http://192.168.0.100:9200logging.level.root=info

gmall-list-service的pom.xml:

<?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><parent><groupId>com.javawxid.gmall</groupId><artifactId>gmall-parent</artifactId><version>1.0-SNAPSHOT</version></parent><groupId>com.javawxid.gmall</groupId><artifactId>gmall-list-service</artifactId><version>0.0.1-SNAPSHOT</version><name>gmall-list-service</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>com.javawxid.gmall</groupId><artifactId>gmall-service-util</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>com.javawxid.gmall</groupId><artifactId>gmall-api</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-elasticsearch</artifactId></dependency><!-- 导入Jest依赖 --><!-- https://mvnrepository.com/artifact/io.searchbox/jest --><dependency><groupId>io.searchbox</groupId><artifactId>jest</artifactId><version>5.3.3</version></dependency><!-- https://mvnrepository.com/artifact/net.java.dev.jna/jna --><dependency><groupId>net.java.dev.jna</groupId><artifactId>jna</artifactId><version>4.5.1</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

其中jest和jna请将版本号，部分纳入gmall-parent中管理。spring-boot-starter-data-elasticsearch不用管理版本号，其版本跟随springboot的1.5.10大版本号。

gmall-list-web的appliction.properties:

server.port=8083spring.dubbo.registry.address=192.168.0.100:2181spring.dubbo.protocol.name=dubbo
spring.dubbo.application.name=gmall-list-web
spring.dubbo.base-package=com.javawxidspring.dubbo.consumer.timeout=600000
spring.dubbo.consumer.check=falsespring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.cache=falselogging.level.root=info

gmall-list-web的pom.xml:

<?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><parent><groupId>com.javawxid.gmall</groupId><artifactId>gmall-parent</artifactId><version>1.0-SNAPSHOT</version></parent><groupId>com.javawxid.gmall</groupId><artifactId>gmall-list-web</artifactId><version>0.0.1-SNAPSHOT</version><name>gmall-list-web</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>com.javawxid.gmall</groupId><artifactId>gmall-api</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>com.javawxid.gmall</groupId><artifactId>gmall-web-util</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

2、关于es 的java 客户端的选择

目前市面上有两类客户端

一类是TransportClient 为代表的ES原生客户端，不能执行原生dsl语句必须使用它的Java api方法。

另外一种是以Rest Api为主的missing client，最典型的就是jest。这种客户端可以直接使用dsl语句拼成的字符串，直接传给服务端，然后返回json字符串再解析。

两种方式各有优劣，但是最近elasticsearch官网，宣布计划在7.0以后的版本中废除TransportClient。以RestClient为主。

所以在官方的RestClient 基础上，进行了简单包装的Jest客户端，就成了首选，而且该客户端也与springboot完美集成。

3、插入数据

PUT /movie_chn/movie/1

{ "id":1,

"name":"红海行动",

"doubanScore":8.5,

"actorList":[

{"id":1,"name":"张译"},

{"id":2,"name":"海清"},

{"id":3,"name":"张涵予"}

]

}

PUT /movie_chn/movie/2

{

"id":2,

"name":"湄公河行动",

"doubanScore":8.0,

"actorList":[

{"id":3,"name":"张涵予"}

]

}

PUT /movie_chn/movie/3

{

"id":3,

"name":"红海事件",

"doubanScore":5.0,

"actorList":[

{"id":4,"name":"张晨"}

]

}

4、在测试类中测试ES

package com.javawxid;import io.searchbox.client.JestClient;
import io.searchbox.core.Search;
import io.searchbox.core.SearchResult;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;@RunWith(SpringRunner.class)
@SpringBootTest
public class GmallListServiceApplicationTests {@AutowiredJestClient jestClient;@Testpublic void testEs() throws IOException {String query="{\n" +"  \"query\": {\n" +"    \"match\": {\n" +"      \"actorList.name\": \"张译\"\n" +"    }\n" +"  }\n" +"}";Search search = new Search.Builder(query).addIndex("movie_chn").addType("movie").build();SearchResult result = jestClient.execute(search);List<SearchResult.Hit<HashMap, Void>> hits = result.getHits(HashMap.class);for (SearchResult.Hit<HashMap, Void> hit : hits) {HashMap source = hit.source;System.err.println("source = " + source);}}}

打印结果：

source = {doubanScore=8.5, es_metadata_id=1, name=红海行动, actorList=[{id=1.0, name=张译}, {id=2.0, name=海清}, {id=3.0, name=张涵予}], id=1.0}
source = {doubanScore=5.0, es_metadata_id=3, name=红海事件, actorList=[{id=4.0, name=张晨}], id=3.0}
source = {doubanScore=8.0, es_metadata_id=2, name=湄公河行动, actorList=[{id=3.0, name=张涵予}], id=2.0}

以上技术方面的准备就做好了。