Springboot结合ElasticSearch7.6.X实战

A:我的环境

ElasticSearch7.6.2，Springboot2.2.6,idea,JDK1.8，es的高级客户端

B:搭建项目

搭建空项目kone-es-learn,新建模块kone-es-learn,引入依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.kone.wang</groupId>
	<artifactId>kone-es-learn</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>kone-es-learn</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

但是可以在下图中看到springboot2.2.6默认引用的elasticSearch竟然是6.8.7，
这样就和我们要使用的版本不一致了，

保持ElasticSearch版本一致：

<properties>
		<java.version>1.8</java.version>
		<!--自定义es版本，保证和我们安装的版本一致-->
		<elasticsearch.verison>7.6.2</elasticsearch.verison>
</properties>

C:配置

新建ElasticSearchClientConfig配置类

package com.kone.wang.config;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
 * User:kone.wang
 * Time:2020/4/13
 * @author kone.wang*/
// XML
@Configuration
public class ElasticSearchClientConfig {
    @Bean
    public RestHighLevelClient restHighLevelClient(){
        RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("106.14.62.203", 9200,"http")
                )
        );
        return restHighLevelClient;
    }
}

实体类

package com.kone.wang.enty;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.ToString;

@Data
@AllArgsConstructor
@ToString
public class User {
    String name;
    int age;
}

D:测试CURD

package com.kone.wang;

import com.alibaba.fastjson.JSON;
import com.kone.wang.enty.User;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.IOException;
import java.util.ArrayList;
import java.util.concurrent.TimeUnit;

@SpringBootTest
class KoneEsLearnApplicationTests {

    @Autowired
    @Qualifier("restHighLevelClient")
    RestHighLevelClient client;


    // 测试索引的创建 Request PUT kuang_index
    @Test
    void testCreateIndex() throws IOException {
		// 1、创建索引请求
        CreateIndexRequest request = new CreateIndexRequest("kuang_index");
        request.setTimeout(TimeValue.timeValueSeconds(5));
		// 2、客户端执行请求 IndicesClient,请求后获得响应
        CreateIndexResponse createIndexResponse =
                client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println(createIndexResponse);
    }

    // 测试获取索引,判断其是否存在
    @Test
    void testExistIndex() throws IOException {
        GetIndexRequest request = new GetIndexRequest("kuang_index2");
        boolean exists = client.indices().exists(request,
                RequestOptions.DEFAULT);
        System.out.println(exists);
    }

    // 测试删除索引
    @Test
    void testDeleteIndex() throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest("kuang_index");
		// 删除
        AcknowledgedResponse delete = client.indices().delete(request,
                RequestOptions.DEFAULT);
        System.out.println(delete.isAcknowledged());
    }

    // 测试添加文档
    @Test
    void testAddDocument() throws IOException {
		// 创建对象
        User user = new User("狂神说", 3);
		// 创建请求
        IndexRequest request = new IndexRequest("kuang_index");
		// 规则 put /kuang_index/_doc/1
        request.id("1");
        request.timeout(TimeValue.timeValueSeconds(1));
        request.timeout("1s");
		// 将我们的数据放入请求 json
        request.source(JSON.toJSONString(user), XContentType.JSON);
		// 客户端发送请求 , 获取响应的结果
        IndexResponse indexResponse = client.index(request,
                RequestOptions.DEFAULT);
        System.out.println(indexResponse.toString()); //
        System.out.println(indexResponse.status()); // 对应我们命令返回的状态CREATED
    }

    // 获取文档，判断是否存在 get /index/doc/1
    @Test
    void testIsExists() throws IOException {
        GetRequest getRequest = new GetRequest("kuang_index");
		// 不获取返回的 _source 的上下文了
        getRequest.fetchSourceContext(new FetchSourceContext(false));
        getRequest.storedFields("_none_");
        boolean exists = client.exists(getRequest, RequestOptions.DEFAULT);
        System.out.println(exists);
    }

    // 获得文档的信息
    @Test
    void testGetDocument() throws IOException {
        GetRequest getRequest = new GetRequest("kuang_index");
        GetResponse getResponse = client.get(getRequest,
                RequestOptions.DEFAULT);
        System.out.println(getResponse.getSourceAsString()); // 打印文档的内容
        System.out.println(getResponse); // 返回的全部内容和命令式一样的
    }

    // 更新文档的信息
    @Test
    void testUpdateRequest() throws IOException {
        UpdateRequest updateRequest = new UpdateRequest("kuang_index","","1");
        updateRequest.timeout("1s");
        User user = new User("狂神说Java", 18);
        updateRequest.doc(JSON.toJSONString(user), XContentType.JSON);
        UpdateResponse updateResponse = client.update(updateRequest,
                RequestOptions.DEFAULT);
        System.out.println(updateResponse.status());
    }

    // 删除文档记录
    @Test
    void testDeleteRequest() throws IOException {
        DeleteRequest request = new DeleteRequest("kuang_index");
        request.timeout("1s");
        DeleteResponse deleteResponse = client.delete(request,
                RequestOptions.DEFAULT);
        System.out.println(deleteResponse.status());
    }

    // 特殊的，真的项目一般都会批量插入数据！
    @Test
    void testBulkRequest() throws IOException {
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("10s");
        ArrayList<User> userList = new ArrayList<>();
        userList.add(new User("kuangshen1", 3));
        userList.add(new User("kuangshen2", 3));
        userList.add(new User("kuangshen3", 3));
        userList.add(new User("qinjiang1", 3));
        userList.add(new User("qinjiang1", 3));
        userList.add(new User("qinjiang1", 3));
        // 批处理请求
        for (int i = 0; i < userList.size(); i++) {
// 批量更新和批量删除，就在这里修改对应的请求就可以了
            bulkRequest.add(
                    new IndexRequest("kuang_index")
                            .id("" + (i + 1))
                            .source(JSON.toJSONString(userList.get(i)), XContentType.JSON));
        }
        BulkResponse bulkResponse = client.bulk(bulkRequest,
                RequestOptions.DEFAULT);
        System.out.println(bulkResponse.hasFailures()); // 是否失败，返回 false 代表成功！
    }

    // 查询
	// SearchRequest 搜索请求
	// SearchSourceBuilder 条件构造
	// HighlightBuilder 构建高亮
	// TermQueryBuilder 精确查询
	// MatchAllQueryBuilder
	// xxx QueryBuilder 对应我们刚才看到的命令！
    @Test
    void testSearch() throws IOException {
        SearchRequest searchRequest = new SearchRequest("kuang_index");
		// 构建搜索条件
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.highlighter();
		// 查询条件，我们可以使用 QueryBuilders 工具来实现
		// QueryBuilders.termQuery 精确
		// QueryBuilders.matchAllQuery() 匹配所有
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name",
                "qinjiang1");
		// MatchAllQueryBuilder matchAllQueryBuilder =
        QueryBuilders.matchAllQuery();
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest,
                RequestOptions.DEFAULT);
        System.out.println(JSON.toJSONString(searchResponse.getHits()));
        System.out.println("=================================");
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
            System.out.println(documentFields.getSourceAsMap());
        }
    }
}

E:接下一篇：仿京东搜索

爬取数据->业务编写->前后端交互->数据高亮