第131天学习打卡（ElastiSearch 集成SpringBoot）

Posted 2021-05-23 doudoutj

集成SpringBoot

查找官方文档

1.找到原生的依赖

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.12.1</version>
</dependency>

2.找对象

3.分析这个类中的方法即可！

配置基本的项目

创建一个空项目

因为建立的是空项目，所以要配置环境

一定要保证我们的导入的依赖和我们的es版本一致

源码中提供对象！

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-K6xz4dIG-1621430912513)(C:\\Users\\HP\\AppData\\Roaming\\Typora\\typora-user-images\\image-20210519160050681.png)]

虽然这里导入了3个类，静态内部类，核心类只有一个

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

package org.springframework.boot.autoconfigure.data.elasticsearch;

import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.action.support.WriteRequest.RefreshPolicy;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.client.reactive.ReactiveElasticsearchClient;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.data.elasticsearch.core.ReactiveElasticsearchOperations;
import org.springframework.data.elasticsearch.core.ReactiveElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
import org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter;
import org.springframework.data.elasticsearch.core.mapping.SimpleElasticsearchMappingContext;
import org.springframework.web.reactive.function.client.WebClient;

abstract class ElasticsearchDataConfiguration {
    ElasticsearchDataConfiguration() {
    }

    @Configuration(
        proxyBeanMethods = false
    )
    @ConditionalOnClass({WebClient.class, ReactiveElasticsearchOperations.class})
    static class ReactiveRestClientConfiguration {
        ReactiveRestClientConfiguration() {
        }

        @Bean
        @ConditionalOnMissingBean(
            value = {ReactiveElasticsearchOperations.class},
            name = {"reactiveElasticsearchTemplate"}
        )
        @ConditionalOnBean({ReactiveElasticsearchClient.class})
        ReactiveElasticsearchTemplate reactiveElasticsearchTemplate(ReactiveElasticsearchClient client, ElasticsearchConverter converter) {
            ReactiveElasticsearchTemplate template = new ReactiveElasticsearchTemplate(client, converter);
            template.setIndicesOptions(IndicesOptions.strictExpandOpenAndForbidClosed());
            template.setRefreshPolicy(RefreshPolicy.IMMEDIATE);
            return template;
        }
    }

    @Configuration(
        proxyBeanMethods = false
    )
    //RestHighLevelClient 高级客户端
    @ConditionalOnClass({RestHighLevelClient.class})
    static class RestClientConfiguration {
        RestClientConfiguration() {
        }

        @Bean
        @ConditionalOnMissingBean(
            value = {ElasticsearchOperations.class},
            name = {"elasticsearchTemplate"}
        )
        @ConditionalOnBean({RestHighLevelClient.class})
        ElasticsearchRestTemplate elasticsearchTemplate(RestHighLevelClient client, ElasticsearchConverter converter) {
            return new ElasticsearchRestTemplate(client, converter);
        }
    }

    @Configuration(
        proxyBeanMethods = false
    )
    static class BaseConfiguration {
        BaseConfiguration() {
        }

        @Bean
        @ConditionalOnMissingBean
        ElasticsearchConverter elasticsearchConverter(SimpleElasticsearchMappingContext mappingContext) {
            return new MappingElasticsearchConverter(mappingContext);
        }

        @Bean
        @ConditionalOnMissingBean
        SimpleElasticsearchMappingContext mappingContext() {
            return new SimpleElasticsearchMappingContext();
        }
    }
}

具体的API测试

连接java后不需要kibana

config ElasticSearchClientConfig .java

package com.kuang.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;
//spring的两步骤
//1.找对象
//2.放到spring中待用
//3.如果是springboot 就先分析源码
@Configuration  //相当于xml文件 r
public class ElasticSearchClientConfig {
    // spring <beans id = restHighLevelClient class = RestHighLevelClient>
    @Bean
    public RestHighLevelClient restHighLevelClient(){
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("127.0.0.1", 9200, "http")));
        return client;


    }
}

**pojo User.java **

package com.kuang.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.stereotype.Component;
@Data
@AllArgsConstructor
@NoArgsConstructor
@Component //注入到spring中
public class User {
    private String name;
    private int age;
}

1.创建索引

2.判断索引是否存在

3.删除索引

4.创建文档

5.crud文档

在pom.xml中引入依赖：

<!--        引入fastjson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.75</version>
        </dependency>

package com.kuang;

import com.alibaba.fastjson.JSON;
import com.kuang.pojo.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.MatchAllQueryBuilder;
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 KuangshenEsApiApplicationTests {
    //面向对象来操作
    @Autowired //按照类型匹配
    @Qualifier("restHighLevelClient")
    private RestHighLevelClient client;
    //测试索引的创建 request

    @Test
    void testCreateIndex() throws IOException {
        //1.创建索引请求
        CreateIndexRequest request = new CreateIndexRequest("kuang_index");
        //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,只能判断其是否存在
    @Test
    void testExistIndex() throws IOException {
        GetIndexRequest request = new GetIndexRequest("kuang_index");
        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);
        IndexRequest request = new IndexRequest("kuang_index");

        //规则put /kuang_index/_doc/1
        request.id("1");
        request.timeout(TimeValue.timeValueSeconds(1)); //设置过期规则
        request.timeout("1s");

        //将我们的数据放入请求 所有的数据都是json数据
         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", "1");
        //不获取返回的_source的上下文
        //es查询返回的json结果是"hits"下的_source    _source是你查出来的json字符串的一个Key
        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", "1");
        GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);
        System.out.println(getResponse.getSourceAsString());
        System.out.println(getResponse);//返回的全部内容和命令是一样的

    }
    //更新文档信息
    @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", "1");
        request.timeout("1s");
        DeleteResponse deleteResponse = client.delete(request, RequestOptions.DEFAULT);
        System.out.println(deleteResponse.status());
    }

    //特殊的 真实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("qinjiang2", 3));
        userList.add(new User("qinjiang3", 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即可
            bulkRequest.add(
                    new IndexRequest("kuang_index")
                    .id("" + (i + 1))//如果这里不用id  执行的时候就会生成随机id
                    .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就表示没有失败

    }<
以上是关于第131天学习打卡（ElastiSearch  集成SpringBoot）的主要内容，如果未能解决你的问题，请参考以下文章
 
 深度学习----------打卡第13天
 深度学习----------打卡第8天
 第201天学习打卡（幂等性）
 第198天学习打卡（谷粒商城 项目 排错）
 第200天学习打卡（RabbitMQ）
 第160天学习打卡（项目 谷粒商城 2）