Elasticsearch8.1-ElasticsearchClient-Java客户端简单增删查改-随笔

1. 环境准备
   1. Springboot 基本环境
      1. 自行前往https://start.spring.io/ 构建一个即可
   2. Elasticsearch服务端
      1. 简单说下windows版本的安装  https://www.elastic.co/cn/downloads/elasticsearch   下载最新版8.1.0，之后解压 不要放到中文目录下，进入bin目录双击运行elasticsearch.bat.
2. 相关依赖

   1. pom.xml   ELasticsearch相关的依赖

      <dependency>
          <groupId>co.elastic.clients</groupId>
          <artifactId>elasticsearch-java</artifactId>
          <version>8.1.0</version>
      </dependency>
      <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>2.13.2</version>
      </dependency>

   2. application.yml

      elasticsearch:
        host: 127.0.0.1
        port: 9200

3. 代码逻辑解释
   1. 创建Elasticsearch 客户端 的bean 对象
      
      查看代码

      package cn.daimao.TestTryProject.bean;
      import co.elastic.clients.elasticsearch.ElasticsearchClient;
      import co.elastic.clients.json.jackson.JacksonJsonpMapper;
      import co.elastic.clients.transport.ElasticsearchTransport;
      import co.elastic.clients.transport.rest_client.RestClientTransport;
      import org.apache.http.HttpHost;
      import org.elasticsearch.client.RestClient;
      import org.elasticsearch.client.RestClientBuilder;
      import org.springframework.beans.factory.annotation.Value;
      import org.springframework.context.annotation.Bean;
      import org.springframework.stereotype.Component;
      @Component
      public class ElasticClient {
          @Value("${elasticsearch.host}")
          private String host;
          @Value("${elasticsearch.port}")
          private Integer port;
          @Bean
          public ElasticsearchClient getClient(){
              RestClientBuilder builder = RestClient.builder(
                      new HttpHost(host, port));
              ElasticsearchTransport transport = new RestClientTransport(builder.build(),new JacksonJsonpMapper());
              return new ElasticsearchClient(transport);
          }
      }
      

   2. 准备测试对象
      1. 创建测试商品表

         SET NAMES utf8mb4;
         SET FOREIGN_KEY_CHECKS = 0;
         
         -- ----------------------------
         -- Table structure for t_product
         -- ----------------------------
         DROP TABLE IF EXISTS `t_product`;
         CREATE TABLE `t_product`  (
           `product_id` bigint(0) NOT NULL AUTO_INCREMENT,
           `product_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '商品名称',
           `product_price` decimal(10, 2) NULL DEFAULT NULL COMMENT '商品价格',
           `product_category` bigint(0) NULL DEFAULT NULL COMMENT '商品分类',
           `product_imgurl` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '商品图片地址',
           `product_num` int(0) NULL DEFAULT NULL COMMENT '商品库存',
           `product_description` varchar(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '商品简单描述',
           `sale` bigint(0) NULL DEFAULT NULL COMMENT '销量',
           `quill` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL COMMENT '详细描述',
           `product_status` int(0) NULL DEFAULT NULL COMMENT '状态',
           `create_time` datetime(0) NULL DEFAULT NULL COMMENT '创建时间',
           `create_id` bigint(0) NULL DEFAULT NULL COMMENT '创建人',
           PRIMARY KEY (`product_id`) USING BTREE
         ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;
         
         SET FOREIGN_KEY_CHECKS = 1;

         2.使用mybatis-plus 生成商品相应对象、service、mapper等

         <dependency>
             <groupId>com.baomidou</groupId>
             <artifactId>mybatis-plus-boot-starter</artifactId>
             <version>3.5.1</version>
         </dependency>

         查看代码

         package cn.daimao.TestTryProject.domain;
         
         import com.baomidou.mybatisplus.annotation.IdType;
         import com.baomidou.mybatisplus.annotation.TableField;
         import com.baomidou.mybatisplus.annotation.TableId;
         import com.baomidou.mybatisplus.annotation.TableName;
         import java.io.Serializable;
         import java.math.BigDecimal;
         import java.util.Date;
         import lombok.Data;
         
         /**
          *
          * @TableName t_product
          */
         @TableName(value ="t_product")
         @Data
         public class TProduct implements Serializable {
             /**
              *
              */
             @TableId(type = IdType.AUTO)
             private Long productId;
         
             /**
              * 商品名称
              */
             private String productName;
         
             /**
              * 商品价格
              */
             private BigDecimal productPrice;
         
             /**
              * 商品分类
              */
             private Long productCategory;
         
             /**
              * 商品图片地址
              */
             private String productImgurl;
         
             /**
              * 商品库存
              */
             private Integer productNum;
         
             /**
              * 商品简单描述
              */
             private String productDescription;
         
             /**
              * 销量
              */
             private Long sale;
         
             /**
              * 详细描述
              */
             private String quill;
         
             /**
              * 状态
              */
             private Integer productStatus;
         
             /**
              * 创建时间
              */
             private Date createTime;
         
             /**
              * 创建人
              */
             private Long createId;
         
             @TableField(exist = false)
             private static final long serialVersionUID = 1L;
         
             @Override
             public boolean equals(Object that) {
                 if (this == that) {
                     return true;
                 }
                 if (that == null) {
                     return false;
                 }
                 if (getClass() != that.getClass()) {
                     return false;
                 }
                 TProduct other = (TProduct) that;
                 return (this.getProductId() == null ? other.getProductId() == null : this.getProductId().equals(other.getProductId()))
                     && (this.getProductName() == null ? other.getProductName() == null : this.getProductName().equals(other.getProductName()))
                     && (this.getProductPrice() == null ? other.getProductPrice() == null : this.getProductPrice().equals(other.getProductPrice()))
                     && (this.getProductCategory() == null ? other.getProductCategory() == null : this.getProductCategory().equals(other.getProductCategory()))
                     && (this.getProductImgurl() == null ? other.getProductImgurl() == null : this.getProductImgurl().equals(other.getProductImgurl()))
                     && (this.getProductNum() == null ? other.getProductNum() == null : this.getProductNum().equals(other.getProductNum()))
                     && (this.getProductDescription() == null ? other.getProductDescription() == null : this.getProductDescription().equals(other.getProductDescription()))
                     && (this.getSale() == null ? other.getSale() == null : this.getSale().equals(other.getSale()))
                     && (this.getQuill() == null ? other.getQuill() == null : this.getQuill().equals(other.getQuill()))
                     && (this.getProductStatus() == null ? other.getProductStatus() == null : this.getProductStatus().equals(other.getProductStatus()))
                     && (this.getCreateTime() == null ? other.getCreateTime() == null : this.getCreateTime().equals(other.getCreateTime()))
                     && (this.getCreateId() == null ? other.getCreateId() == null : this.getCreateId().equals(other.getCreateId()));
             }
         
             @Override
             public int hashCode() {
                 final int prime = 31;
                 int result = 1;
                 result = prime * result + ((getProductId() == null) ? 0 : getProductId().hashCode());
                 result = prime * result + ((getProductName() == null) ? 0 : getProductName().hashCode());
                 result = prime * result + ((getProductPrice() == null) ? 0 : getProductPrice().hashCode());
                 result = prime * result + ((getProductCategory() == null) ? 0 : getProductCategory().hashCode());
                 result = prime * result + ((getProductImgurl() == null) ? 0 : getProductImgurl().hashCode());
                 result = prime * result + ((getProductNum() == null) ? 0 : getProductNum().hashCode());
                 result = prime * result + ((getProductDescription() == null) ? 0 : getProductDescription().hashCode());
                 result = prime * result + ((getSale() == null) ? 0 : getSale().hashCode());
                 result = prime * result + ((getQuill() == null) ? 0 : getQuill().hashCode());
                 result = prime * result + ((getProductStatus() == null) ? 0 : getProductStatus().hashCode());
                 result = prime * result + ((getCreateTime() == null) ? 0 : getCreateTime().hashCode());
                 result = prime * result + ((getCreateId() == null) ? 0 : getCreateId().hashCode());
                 return result;
             }
         
             @Override
             public String toString() {
                 StringBuilder sb = new StringBuilder();
                 sb.append(getClass().getSimpleName());
                 sb.append(" [");
                 sb.append("Hash = ").append(hashCode());
                 sb.append(", productId=").append(productId);
                 sb.append(", productName=").append(productName);
                 sb.append(", productPrice=").append(productPrice);
                 sb.append(", productCategory=").append(productCategory);
                 sb.append(", productImgurl=").append(productImgurl);
                 sb.append(", productNum=").append(productNum);
                 sb.append(", productDescription=").append(productDescription);
                 sb.append(", sale=").append(sale);
                 sb.append(", quill=").append(quill);
                 sb.append(", productStatus=").append(productStatus);
                 sb.append(", createTime=").append(createTime);
                 sb.append(", createId=").append(createId);
                 sb.append(", serialVersionUID=").append(serialVersionUID);
                 sb.append("]");
                 return sb.toString();
             }
         }

         查看代码

         package cn.daimao.TestTryProject.service;
         
         import cn.daimao.TestTryProject.domain.TProduct;
         import com.baomidou.mybatisplus.extension.service.IService;
         
         /**
         * @author 毛明辉
         * @description 针对表【t_product】的数据库操作Service
         * @createDate 2022-04-06 14:40:35
         */
         public interface TProductService extends IService<TProduct> {
         
         }
         

         package cn.daimao.TestTryProject.service.impl;
         
         import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
         import cn.daimao.TestTryProject.domain.TProduct;
         import cn.daimao.TestTryProject.service.TProductService;
         import cn.daimao.TestTryProject.mapper.TProductMapper;
         import org.springframework.stereotype.Service;
         
         /**
         * @author 毛明辉
         * @description 针对表【t_product】的数据库操作Service实现
         * @createDate 2022-04-06 14:40:35
         */
         @Service
         public class TProductServiceImpl extends ServiceImpl<TProductMapper, TProduct>
             implements TProductService{
         
         }
         
         

         <?xml version="1.0" encoding="UTF-8"?>
         <!DOCTYPE mapper
                 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
                 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
         <mapper namespace="cn.daimao.TestTryProject.mapper.TProductMapper">
         
             <resultMap id="BaseResultMap" type="cn.daimao.TestTryProject.domain.TProduct">
                     <id property="productId" column="product_id" jdbcType="BIGINT"/>
                     <result property="productName" column="product_name" jdbcType="VARCHAR"/>
                     <result property="productPrice" column="product_price" jdbcType="DECIMAL"/>
                     <result property="productCategory" column="product_category" jdbcType="BIGINT"/>
                     <result property="productImgurl" column="product_imgurl" jdbcType="VARCHAR"/>
                     <result property="productNum" column="product_num" jdbcType="INTEGER"/>
                     <result property="productDescription" column="product_description" jdbcType="VARCHAR"/>
                     <result property="sale" column="sale" jdbcType="BIGINT"/>
                     <result property="quill" column="quill" jdbcType="VARCHAR"/>
                     <result property="productStatus" column="product_status" jdbcType="INTEGER"/>
                     <result property="createTime" column="create_time" jdbcType="TIMESTAMP"/>
                     <result property="createId" column="create_id" jdbcType="BIGINT"/>
             </resultMap>
         
             <sql id="Base_Column_List">
                 product_id,product_name,product_price,
                 product_category,product_imgurl,product_num,
                 product_description,sale,quill,
                 product_status,create_time,create_id
             </sql>
         </mapper>
         

      2. Elasticsearch相关
         
         1. 创建索引product,可以手动创建，客户端API方法如下，indexName传product即可，简单创建一下就行。

            @Autowired
            private ElasticsearchClient elasticsearchClient;
            @PostMapping("/createIndex")
            public ResultJson createIndex(@RequestParam String indexName) throws IOException {
                elasticsearchClient.indices().create(createIndex -> createIndex.index(indexName));
                return ResultJson.success();
            }

         2. product 增删改  直接上代码 ，毕竟简单

            package cn.daimao.TestTryProject.service;
            
            import cn.daimao.TestTryProject.common.ResultJson;
            import cn.daimao.TestTryProject.domain.TProduct;
            import co.elastic.clients.elasticsearch.ElasticsearchClient;
            import co.elastic.clients.elasticsearch.core.DeleteRequest;
            import co.elastic.clients.elasticsearch.core.IndexRequest;
            import co.elastic.clients.elasticsearch.core.UpdateRequest;
            import org.springframework.beans.factory.annotation.Autowired;
            import org.springframework.stereotype.Service;
            
            import java.io.IOException;
            
            @Service
            public class ElasticSearchService {
                @Autowired
                private ElasticsearchClient elasticsearchClient;
            
                /**
                 * 上传商品相关数据到Elasticsearch
                 * @param tProduct
                 */
                public ResultJson uploadProduct(TProduct tProduct)  {
                    IndexRequest<TProduct> req ;
                    req = IndexRequest.of( b->
                            b.index("product").id(tProduct.getProductId()+"").document(tProduct));
                    try {
                        elasticsearchClient.index(req);
                        return ResultJson.success();
                    } catch (IOException e) {
                        return ResultJson.failure(e.toString());
                    }
                }
            
                /**
                 * 修改
                 * @param tProduct
                 * @return
                 */
                public ResultJson updateDocument(TProduct tProduct){
                    UpdateRequest<TProduct,TProduct> req;
                    req = UpdateRequest.of(
                            b-> b.index("product").id(tProduct.getProductId()+"")
                                            .doc(tProduct)
                    );
                    try {
                        elasticsearchClient.update(req,TProduct.class);
                        return ResultJson.success();
                    } catch (IOException e) {
                        return ResultJson.failure(e.toString());
                    }
                }
            
                /**
                 * 删除
                 * @param productId
                 * @return
                 */
                public ResultJson deleteDocument(Long productId){
                    DeleteRequest req ;
                    req = DeleteRequest.of(
                            b-> b.index("product").id(productId+"")
                    );
            
                    try {
                        elasticsearchClient.delete(req);
                        return ResultJson.success();
                    } catch (IOException e) {
                        return ResultJson.failure(e.toString());
                    }
                }
            }
            

            在商品操作的时候调用一下即可

            package cn.daimao.TestTryProject.controller;
            
            import cn.daimao.TestTryProject.common.ResultJson;
            import cn.daimao.TestTryProject.domain.TProduct;
            import cn.daimao.TestTryProject.service.ElasticSearchService;
            import cn.daimao.TestTryProject.service.TProductService;
            import org.springframework.beans.factory.annotation.Autowired;
            import org.springframework.web.bind.annotation.*;
            
            import java.util.Date;
            
            @RestController
            @RequestMapping("/api/product")
            public class ProductController {
                @Autowired
                private TProductService tProductService;
                @Autowired
                private ElasticSearchService elasticSearchService;
            
                @PostMapping("/save")
                public ResultJson save(@RequestBody TProduct tProduct){
                    tProduct.setCreateTime(new Date());
                    tProductService.save(tProduct);
                    return elasticSearchService.uploadProduct(tProduct);
                }
                @PostMapping("/update")
                public ResultJson update(@RequestBody TProduct tProduct){
                    tProductService.updateById(tProduct);
                    return elasticSearchService.updateDocument(tProduct);
                }
                @PostMapping("/delete")
                public ResultJson delete(@RequestParam Long productId){
                    tProductService.removeById(productId);
                    return elasticSearchService.deleteDocument(productId);
                }
            
            }
            

            漏发了一个通用类，比较简单， 不发了。

4. 成果展示
   1. 数据我update过，总之是已经传到Elasticsearch上面了。
5. 查询，后面再补，这个才是关键。