elasticSearch-JavaRest 高级客户端入门

6 JavaRest 高级客户端入门

1 JavaRest 高级客户端简介

elasticsearch 存在三种Java客户端。

1. Transport Client
2. Java Low Level Rest Client（低级rest客户端）
3. Java High Level REST Client（高级rest客户端）
   这三者的区别是：
   TransportClient没有使用RESTful风格的接口，而是二进制的方式传输数据。
   ES官方推出了Java Low Level REST Client,它支持RESTful。但是缺点是因为
   TransportClient的使用者把代码迁移到Low Level REST Client的工作量比较大。
   ES官方推出Java High Level REST Client,它是基于Java Low Level REST Client的封装，并且API接收参数和返回值和TransportClient是一样的，使得代码迁移变得容易并且支持了RESTful的风格，兼容了这两种客户端的优点。强烈建议ES5及其以后的版本使用Java High Level REST Client。

2 准备工作：新建工程，引入依赖

    
        org.elasticsearch.client
        elasticsearch-rest-high-level-client
        6.5.3
    

3 快速入门

1 新增和修改数据

插入单条数据：
HttpHost : url地址封装
RestClientBuilder： rest客户端构建器
RestHighLevelClient： rest高级客户端
IndexRequest： 新增或修改请求
IndexResponse：新增或修改的响应结

package cn.laixueit.demo;

import org.apache.http.HttpHost;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class ElasticSearchDemo {
    public static void main(String[] args) throws IOException {
        // 1 建立连接
        HttpHost http = new HttpHost("127.0.0.1", 9200, "http");
        RestClientBuilder clientBuilder = RestClient.builder(http);
        RestHighLevelClient client = new RestHighLevelClient(clientBuilder);
        // 2 发送数据

        IndexRequest indexRequest = new IndexRequest("sku","doc","3");
        Map skuMap = new HashMap();
        skuMap.put("name","华为p30pro");
        skuMap.put("brandName","华为");
        skuMap.put("categoryName","手机");
        skuMap.put("price",1010221);
        skuMap.put("createTime","2019-05-01");
        skuMap.put("saleNum",101021);
        skuMap.put("commentNum",10102321);
        Map spec=new HashMap();
        spec.put("网络制式","移动4G");
        spec.put("屏幕尺寸","5");
        skuMap.put("spec",spec);
        indexRequest.source(skuMap);
        // 3 返回响应
        IndexResponse response = client.index(indexRequest, RequestOptions.DEFAULT);
        int status = response.status().getStatus();
        System.out.println(status);
    }
}

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如果ID不存在则新增，如果ID存在则修改。
批处理请求：
BulkRequest： 批量请求（用于增删改操作）
BulkResponse：批量请求（用于增删改操作）
修改测试：源代码修改字段属性继续提交
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2 批量请求（用于增删改操作）

package cn.laixueit.demo;

import org.apache.http.HttpHost;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;

import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class ElasticSearchDemo {
    public static void main(String[] args) throws IOException {
        // 1 建立连接
        HttpHost http = new HttpHost("127.0.0.1", 9200, "http");
        RestClientBuilder clientBuilder = RestClient.builder(http);
        RestHighLevelClient client = new RestHighLevelClient(clientBuilder);
        // 2 发送数据
        BulkRequest bulkRequest = new BulkRequest();

        IndexRequest indexRequest = new IndexRequest("sku","doc","5");

        Map skuMap = new HashMap();
        skuMap.put("name","华为p5");
        skuMap.put("brandName","华为");
        skuMap.put("categoryName","手机");
        skuMap.put("price",1010221);
        skuMap.put("createTime",new Date());
        skuMap.put("saleNum",101021);
        skuMap.put("commentNum",10102321);
        Map spec=new HashMap();
        spec.put("网络制式","移动4G");
        spec.put("屏幕尺寸","5");
        skuMap.put("spec",spec);
        indexRequest.source(skuMap);

        IndexRequest indexRequest2 = new IndexRequest("sku","doc","6");
        Map skuMap2 = new HashMap();
        skuMap2.put("name","华为p6 ");
        skuMap2.put("brandName","华为");
        skuMap2.put("categoryName","手机");
        skuMap2.put("price",1010221);
        skuMap2.put("createTime",new Date());
        skuMap2.put("saleNum",101021);
        skuMap2.put("commentNum",10102321);
        Map spec2=new HashMap();
        spec2.put("网络制式","移动4G");
        spec2.put("屏幕尺寸","5");
        skuMap2.put("spec",spec2);
        indexRequest2.source(skuMap2);

        bulkRequest.add(indexRequest);
        bulkRequest.add(indexRequest2);
        // 3 返回响应
//        IndexResponse response = client.index(indexRequest, RequestOptions.DEFAULT);
        BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        int status = bulkResponse.status().getStatus();
        System.out.println(status);

        client.close();
    }
}

3 匹配查询

SearchRequest： 查询请求对象
SearchResponse：查询响应对象
SearchSourceBuilder：查询源构建器
MatchQueryBuilder：匹配查询构建器

package cn.laixueit.demo;

import org.apache.http.HttpHost;
import org.apache.http.client.config.RequestConfig;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.MatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class Test2 {
    public static void main(String[] args) throws IOException {
        // 1 建立连接
        HttpHost http = new HttpHost("127.0.0.1", 9200, "http");
        RestClientBuilder clientBuilder = RestClient.builder(http);
        RestHighLevelClient client = new RestHighLevelClient(clientBuilder);
        // 2 发送数据
        SearchRequest searchRequest = new SearchRequest("sku");
        searchRequest.types("doc");

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        MatchQueryBuilder queryBuilder = QueryBuilders.matchQuery("name", "小米");
        SearchSourceBuilder query = sourceBuilder.query(queryBuilder);

        searchRequest.source(sourceBuilder);


        // 3 返回响应
        SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
        SearchHit[] hits = response.getHits().getHits();
        Arrays.stream(hits).forEach((r)->{
            System.out.println(r.getSourceAsString());
        });

        client.close();
    }
}

4 布尔与词条查询

BoolQueryBuilder：布尔查询构建器
TermQueryBuilder：词条查询构建器
QueryBuilders：查询构建器工厂

package cn.laixueit.demo;

import org.apache.http.HttpHost;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.MatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;
import java.util.Arrays;

/**
 * BoolQueryBuilder：布尔查询构建器
 * TermQueryBuilder：词条查询构建器
 * QueryBuilders：查询构建器工厂
 */
public class Test3 {
    public static void main(String[] args) throws IOException {
        // 1 建立连接
        HttpHost http = new HttpHost("127.0.0.1", 9200, "http");
        RestClientBuilder clientBuilder = RestClient.builder(http);
        RestHighLevelClient client = new RestHighLevelClient(clientBuilder);
        // 2 发送数据

        SearchRequest searchRequest = new SearchRequest("sku");
        searchRequest.types("doc");

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("name", "华为");
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("brandName", "小米");

        boolQuery.must(matchQueryBuilder);
        boolQuery.must(termQueryBuilder);

        searchSourceBuilder.query(boolQuery);

        searchRequest.source(searchSourceBuilder);


        // 3 返回响应
        SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
        SearchHit[] hits = response.getHits().getHits();
        Arrays.stream(hits).forEach((r)->{
            System.out.println(r.getSourceAsString());
        });

        client.close();
    }
}

5 过滤查询

package cn.laixueit.demo;

import org.apache.http.HttpHost;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.MatchQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;
import java.util.Arrays;

public class Test4 {
    public static void main(String[] args) throws IOException {
        // 1 建立连接
        HttpHost http = new HttpHost("127.0.0.1", 9200, "http");
        RestClientBuilder clientBuilder = RestClient.builder(http);
        RestHighLevelClient client = new RestHighLevelClient(clientBuilder);
        // 2 发送数据

        SearchRequest searchRequest = new SearchRequest("sku");
        searchRequest.types("doc");

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("brandName", "小米");

        boolQuery.filter(termQueryBuilder);

        searchSourceBuilder.query(boolQuery);

        searchRequest.source(searchSourceBuilder);


        // 3 返回响应
        SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
        SearchHit[] hits = response.getHits().getHits();
        Arrays.stream(hits).forEach((r)->{
            System.out.println(r.getSourceAsString());
        });

        client.close();
    }
}