全文检索工具elasticsearch：第三章： Java程序中的应用

Java廖志伟

发布于 2022-09-28 14:53:07

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发布于 2022-09-28 14:53:07

文章被收录于专栏：高级开发进阶高级开发进阶

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=root

mybatis.configuration.map-underscore-to-camel-case=true
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

spring.dubbo.registry.protocol=zookeeper
spring.dubbo.registry.address=192.168.0.100:2181

spring.dubbo.application.name=gmall-list-service
spring.dubbo.protocol.name=dubbo
spring.dubbo.base-package=com.javawxid

spring.elasticsearch.jest.uris=http://192.168.0.100:9200

logging.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=8083

spring.dubbo.registry.address=192.168.0.100:2181

spring.dubbo.protocol.name=dubbo
spring.dubbo.application.name=gmall-list-web
spring.dubbo.base-package=com.javawxid

spring.dubbo.consumer.timeout=600000
spring.dubbo.consumer.check=false

spring.thymeleaf.mode=LEGACYHTML5
spring.thymeleaf.cache=false

logging.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 {

    @Autowired
    JestClient jestClient;

    @Test
    public 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。

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原始发表：2021-04-28，如有侵权请联系 cloudcommunity@tencent.com 删除