elasticsearch学习（三）

transportclient和restclient区别

使用springboot构建es项目主体方法有两种：transportclient和restclient。

• 方法一：transportclient

transportclient是通过监听es端口的tcp链接进行数据传输，springboot项目可以通过引入spring-boot-starter-data-elasticsearch来实现，是由spring官方所出。但是由于es版本更新较快，而官方内置的es版本更新速度慢，适配的都是较低版本，容易出现版本对应步上的问题。

• 方法二：restclient

restclient是通过http来进行数据传输，相对于transportclient，它的版本兼容性更好，可以通过整合elasticsearch-rest-high-level-client来实现。且在官方说明中transportclient会在es高版本中被弃用，故推荐使用restclient;

elasticsearch项目构建

• spring-boot-starter-data-elasticsearch

导入maven工程，es版本与导入的springboot版本相关

     
     org.springframework.boot
     spring-boot-starter-data-elasticsearch

添加配置文件

spring.data.elasticsearch.client.reactive.endpoints=127.0.0.1:9200
#是否遵守SSL(Secure Sockets Layer 安全套接字协议)协议
spring.data.elasticsearch.client.reactive.use-ssl=false
#连接超时时间
spring.data.elasticsearch.client.reactive.connection-timeout=100000
spring.data.elasticsearch.client.reactive.socket-timeout=500000
#是否开启本地存储
spring.data.elasticsearch.repositories.enabled=true

创建一个实体类

@ApiModel(description = "Goods实体")
@Data
//type已被注释为过失，不传情况下，es会默认创建一个type为：_doc
@Document(indexName = "big_data_center_goods", type = "goods", shards = 2, replicas = 0)
public class Goods implements Serializable {
    @ApiModelProperty(value = "主键ID")
    //指定es中的id
    @Id
    private String id;
    @ApiModelProperty(value = "店铺编码")
    private String shopCode;
    @ApiModelProperty(value = "商品名称")
    private String goodsName;
    @ApiModelProperty(value = "商品价格")
    private BigDecimal price;
    @ApiModelProperty(value = "商品描述")
    private String desc;
    @ApiModelProperty(value = "创建时间")
    private String createTime;
}

创建repository

import cn.pdl.pelasticsearch.entity.Goods;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;

@Repository
//ElasticsearchRepository已继承ElasticsearchCrudRepository，其内置了很多方法实现，类似JPA，通过规范方法命名就能实现查询操作；
public interface GoodsRepository extends ElasticsearchRepository{

    Page findAllByGoodsName(String shopName, Pageable pageable);

    Page findAllByShopCodeContains(String shopCode, Pageable pageable);

    Page findAllById(String id,Pageable pageable);
}

创建service层即其实现

public interface IGoodsService {

    Optional findById(String id);

    Page getGoods(String id, Pageable pageable);

    Goods save(Goods blog);

    Iterable findAll();

    Page findByShopCode(String shopCode, Pageable pageable);
}

@Slf4j
@Service
public class GoodsServiceImpl implements IGoodsService {

    @Autowired
    @Qualifier("goodsRepository")
    private GoodsRepository goodsRepository;

    @Override
    public Optional findById(String id) {
        Optional optionalShop = null;
        try {
            optionalShop = goodsRepository.findById(id);
        } catch (Exception e) {
            log.error(">>>>>>>>>>>>>>>>>>>>>>", e);
        }
        return optionalShop;
    }

    @Override
    public Page getGoods(String id, Pageable pageable) {
        return goodsRepository.findAllById(id,pageable);
    }

    @Override
    public Goods save(Goods blog) {
        Goods shop = null;
        try {
            shop = goodsRepository.save(blog);
        } catch (Exception e) {
            log.error(">>>>>>>>>>>>>>>>>>>>>>", e);
        }
        return shop;
    }

    @Override
    public Iterable findAll() {
        Iterable shops = null;
        try {
            shops = goodsRepository.findAll();
        } catch (Exception e) {
            log.error(">>>>>>>>>>>>>>>>>>>>>>", e);
        }
        return shops;
    }


    @Override
    public Page findByShopCode(String shopCode, Pageable pageable) {
        Page shopPage = null;
        try {
            shopPage = goodsRepository.findAllByShopCodeContains(shopCode, pageable);
        } catch (Exception e) {
            log.error(">>>>>>>>>>>>>>>>>>>>>>", e);
        }
        return shopPage;
    }
}

创建controller层

@RestController
@RequestMapping("/es/appApi")
@Api(value = "es相关接口",tags = {"es相关"})
public class ESController {
    @Autowired
    IGoodsService goodsService;

    @ApiOperation(value = "查询所有", notes="查询所有", httpMethod = "GET")
    @GetMapping(value = "/findByAll")
    public ResponseEntity> findByAll() {
        Iterable data = goodsService.findAll();
        return new ResponseEntity<>(data, HttpStatus.OK);
    }

    @ApiOperation(value = "新增商品信息", notes="新增商品信息", httpMethod = "POST")
    @PostMapping(value = "/createGoods")
    public ResponseEntity createGoods(@RequestBody Goods goods) {
        String id = UUID.randomUUID().toString().replace("-", "");
        String createTime = LocalDateTime.now().toString();
        goods.setId(id);
        goods.setCreateTime(createTime);
        Goods data = goodsService.save(goods);
        return new ResponseEntity<>(data, HttpStatus.OK);
    }
}

• elasticsearch-rest-high-level-client

导入maven工程，es版本可以自己根据需要来改变

        
            org.elasticsearch.client
            elasticsearch-rest-high-level-client
            7.3.1
        
        
            org.elasticsearch.client
            elasticsearch-rest-client
            7.3.1
        
        
            org.elasticsearch
            elasticsearch
            7.3.1
        

配置文件与上面一致
创建实体类

@Data
public class Goods {
    private String goodsName;
    private String goodsCode;
    private String desc;
    private String id;
//索引名称
    private String indexName;
}

封装es方法，实现对数据的增删改查操作，对他入参可根据需要替换成扩展性更高的数据类型

import cn.pdl.pelasticsearch2.entity.Goods;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequest;
import org.elasticsearch.action.admin.indices.create.CreateIndexResponse;
import org.elasticsearch.action.admin.indices.get.GetIndexRequest;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
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.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.ml.PostDataRequest;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.MatchAllQueryBuilder;
import org.elasticsearch.index.query.MatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.reindex.BulkByScrollResponse;
import org.elasticsearch.index.reindex.DeleteByQueryRequest;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.awt.print.Pageable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

@Component
@Slf4j
public class ESUtil {
    @Autowired
    private RestHighLevelClient restHighLevelClient;

  //创建索引
    public  String createIndex(String indexName) throws IOException {
        CreateIndexRequest createIndexRequest = new CreateIndexRequest();
        createIndexRequest.index(indexName).settings(Settings.builder()
                .put("index.number_of_shards",3)//设置分片数量，默认为5个
                .put("index.number_of_replicas",2).build());//设置主分片数量
        CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(createIndexRequest, RequestOptions.DEFAULT);
        return createIndexRequest.index();
    }
  //判断索引是否存在
    public boolean exists(String indexName) throws IOException {
        GetIndexRequest getIndexRequest = new GetIndexRequest();
        getIndexRequest.indices(indexName);
        return restHighLevelClient.indices().exists(getIndexRequest, RequestOptions.DEFAULT);
    }
  //插入数据
    public RestStatus insert(String indexName, Object object) throws IOException {
        IndexRequest indexRequest = new IndexRequest();
        // source方法里面需要填写对应数据的类型，默认数据类型为json
        indexRequest.index(indexName).source(JSON.toJSONString(object), XContentType.JSON);
        IndexResponse response = restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
        return response.status();
    }
  //查询索引下的所有数据
    public List  search(Goods goods) throws IOException {
        SearchRequest searchRequest = new SearchRequest();
        SearchSourceBuilder source = new SearchSourceBuilder();
        source.from(0);
        source.size(10);
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery();
        boolQueryBuilder.should(matchAllQueryBuilder);
        searchRequest.indices(goods.getIndexName()).source(source);
        SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        List list=new ArrayList<>();
        response.getHits().iterator().forEachRemaining(hit-> {
            list.add(JSON.parseObject(hit.getSourceAsString(), Goods.class));
        });
        return list;
    }
  //根据条件查询
    public List  searchByParams(Goods goods) throws IOException {
        SearchRequest searchRequest = new SearchRequest();
        SearchSourceBuilder source = new SearchSourceBuilder();
        source.from(0);
        source.size(10);
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        MatchQueryBuilder goodsName = QueryBuilders.matchQuery("goodsName", goods.getGoodsName());
        MatchQueryBuilder desc = QueryBuilders.matchQuery("desc", goods.getDesc());
        boolQueryBuilder.must(desc);
        source.query(boolQueryBuilder);
        searchRequest.indices(goods.getIndexName()).source(source);
        SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        List list=new ArrayList<>();
        response.getHits().iterator().forEachRemaining(hit-> {
            list.add(JSON.parseObject(hit.getSourceAsString(), Goods.class));
        });
        return list;
    }
  //根据条件删除数据
    public Boolean deleteData(Goods goods) throws IOException{
        DeleteByQueryRequest deleteByQueryRequest = new DeleteByQueryRequest();
        SearchSourceBuilder source = new SearchSourceBuilder();
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        MatchQueryBuilder goodsName = QueryBuilders.matchQuery("goodsName", goods.getGoodsName());
        boolQueryBuilder.must(goodsName);
        source.query(boolQueryBuilder);
        deleteByQueryRequest.setQuery(boolQueryBuilder).indices(goods.getIndexName());
        BulkByScrollResponse bulkByScrollResponse = restHighLevelClient.deleteByQuery(deleteByQueryRequest, RequestOptions.DEFAULT);
        return true;
    }
  //根据主键删除数据
    public Boolean deleteById(String indexName,String id) throws IOException{
        DeleteRequest deleteRequest = new DeleteRequest();
        deleteRequest.index(indexName).id(id);
        DeleteResponse delete = restHighLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
        return true;
    }
}

创建controller层

@Slf4j
@RestController
@RequestMapping("/es/2.0")
@Api(value = "es学习",tags = {"es学习"})
public class ESController {
    @Autowired
    private ESUtil esUtil;

    @PostMapping("/createIndex")
    @ApiOperation(value = "创建索引",notes = "创建索引")
    public String createIndex(@RequestBody Goods goods){
        try {
            esUtil.createIndex(goods.getIndexName());
        } catch (IOException e) {
            return e.getMessage();
        }
        return "success";
    }

    @PostMapping("/insertData")
    @ApiOperation(value = "插入数据",notes = "创建索引")
    public String insertData(@RequestBody Goods goods){
        try {
            esUtil.insert("pdl",goods);
        } catch (IOException e) {
            return e.getMessage();
        }
        return "success";
    }

    @PostMapping("/findAll")
    @ApiOperation(value = "查询所有",notes = "查询所有")
    public List findAll(@RequestBody Goods goods){
        List list = null;
        try {
            list = esUtil.search(goods);
        } catch (IOException e) {
            log.error(e.getMessage());
        }
        return list;
    }

    @PostMapping("/findAllByParams")
    @ApiOperation(value = "根据条件查询所有",notes = "根据条件查询所有")
    public List findAllByParams(@RequestBody Goods goods){
        List list = null;
        try {
            list = esUtil.searchByParams(goods);
        } catch (IOException e) {
            log.error(e.getMessage());
        }
        return list;
    }

    @PostMapping("/delete")
    @ApiOperation(value = "删除",notes = "删除")
    public String delete(@RequestBody Goods goods){
        List list = null;
        try {
            esUtil.deleteData(goods);
        } catch (IOException e) {
            log.error(e.getMessage());
            return e.getMessage();
        }
        return "success";
    }
}

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