官网：https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-high-search.html

JSON工具在线：https://www.bejson.com/

package com.atguigu.gulimall.search;

import com.alibaba.fastjson.JSON;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import lombok.Data;
import lombok.ToString;
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.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.aggregations.metrics.Avg;
import org.elasticsearch.search.aggregations.metrics.AvgAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;
import java.io.IOException;

@RunWith(SpringRunner.class)
@SpringBootTest
public class GulimallSearchApplicationTests {
    @Resource private RestHighLevelClient client;

    @Test
    public void searchData() throws IOException {
        //1.创建检索请求
        SearchRequest searchRequest=new SearchRequest();
        searchRequest.indices("bank");//指定从bank索引下检索数据
        //指定 dsl，检索条件，
        //dsl（uri+请求体的语法，程序Query DSL (domain-specific language)领域特定语言）
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //1.1 构造检索条件
//        searchSourceBuilder.query();
//        searchSourceBuilder.from();
//        searchSourceBuilder.size();
//        searchSourceBuilder.aggregation();
        searchSourceBuilder.query(QueryBuilders.matchQuery("address","mill"));
        //1.2 按照年龄值分布聚合
        TermsAggregationBuilder ageAgg = AggregationBuilders.terms("ageAgg").field("age").size(10);
        searchSourceBuilder.aggregation(ageAgg);
        //1.3 计算平均薪资
        AvgAggregationBuilder balanceAvg = AggregationBuilders.avg("balanceAvg").field("balance");
        searchSourceBuilder.aggregation(balanceAvg);


        System.out.println("检索条件"+searchSourceBuilder.toString());
        searchRequest.source(searchSourceBuilder);

        //2.执行检索
        SearchResponse searchResponse = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
        //3.分析结果
        System.out.println(searchResponse.toString());
//        Map map = JSON.parseObject(searchResponse.toString(), Map.class);
        //3.1 获取所有查到的数据
        SearchHits hits = searchResponse.getHits();
        SearchHit[] searchHits = hits.getHits();
        for (SearchHit hit : searchHits) {
           /* "_index" : "bank",
                    "_type" : "account",
                    "_id" : "970",
                    "_score" : 5.4032025,
                    "_source" : */
//            hit.getIndex();hit.getType();hit.getId();
            String string = hit.getSourceAsString();
            Account account = JSON.parseObject(string, Account.class);
            System.out.println("account:"+account);
        }
        //3.2 获取这次检索到的分析信息

        Aggregations aggregations = searchResponse.getAggregations();
        Terms ageAgg1 = aggregations.get("ageAgg");
        for (Terms.Bucket bucket : ageAgg1.getBuckets()) {
            System.out.println("年龄："+bucket.getKeyAsString()+"==>"+bucket.getDocCount());
        }
        Avg balanceAvg1 = aggregations.get("balanceAvg");
        System.out.println("平均薪资："+balanceAvg1.getValueAsString());
    }
    /**
     * 测试存储数据到es
     */
    @Test
    public void indexData() throws IOException {
        IndexRequest indexRequest = new IndexRequest("users");//向users下存数据
        indexRequest.id("1");//不设会自动生成
//        indexRequest.source("userName", "zhangsan","age", 18,"gender", "男");//数据内容形式，k-v形式
        User user= new User();
        user.setUserName("zhangsan");
        user.setAge(18);
        user.setGender("男");
        String jsonString = JSON.toJSONString(user);
        indexRequest.source(jsonString, XContentType.JSON);//数据内容形式，json形式
        //执行操作。索引数据不存在数据就生成，存在就更新
        IndexResponse index = client.index(indexRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
        System.out.println(index);
    }
    @Data
    static
    class User{
        private String userName;
        private Integer age;
        private String gender;
    }
    @Test
    public void contextLoads() {
        System.out.println(client);
    }

    /**
     * Copyright 2021 bejson.com
     */
    @Data
    @ToString
    static
    class Account {
        private int account_number;
        private int balance;
        private String firstname;
        private String lastname;
        private int age;
        private String gender;
        private String address;
        private String employer;
        private String email;
        private String city;
        private String state;
    }
}

 

打印：

检索条件{"query":{"match":{"address":{"query":"mill","operator":"OR","prefix_length":0,"max_expansions":50,"fuzzy_transpositions":true,"lenient":false,"zero_terms_query":"NONE","auto_generate_synonyms_phrase_query":true,"boost":1.0}}},"aggregations":{"ageAgg":{"terms":{"field":"age","size":10,"min_doc_count":1,"shard_min_doc_count":0,"show_term_doc_count_error":false,"order":[{"_count":"desc"},{"_key":"asc"}]}},"balanceAvg":{"avg":{"field":"balance"}}}}
{"took":11,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":4,"relation":"eq"},"max_score":5.4032025,"hits":[{"_index":"bank","_type":"account","_id":"970","_score":5.4032025,"_source":{"account_number":970,"balance":19648,"firstname":"Forbes","lastname":"Wallace","age":28,"gender":"M","address":"990 Mill Road","employer":"Pheast","email":"forbeswallace@pheast.com","city":"Lopezo","state":"AK"}},{"_index":"bank","_type":"account","_id":"136","_score":5.4032025,"_source":{"account_number":136,"balance":45801,"firstname":"Winnie","lastname":"Holland","age":38,"gender":"M","address":"198 Mill Lane","employer":"Neteria","email":"winnieholland@neteria.com","city":"Urie","state":"IL"}},{"_index":"bank","_type":"account","_id":"345","_score":5.4032025,"_source":{"account_number":345,"balance":9812,"firstname":"Parker","lastname":"Hines","age":38,"gender":"M","address":"715 Mill Avenue","employer":"Baluba","email":"parkerhines@baluba.com","city":"Blackgum","state":"KY"}},{"_index":"bank","_type":"account","_id":"472","_score":5.4032025,"_source":{"account_number":472,"balance":25571,"firstname":"Lee","lastname":"Long","age":32,"gender":"F","address":"288 Mill Street","employer":"Comverges","email":"leelong@comverges.com","city":"Movico","state":"MT"}}]},"aggregations":{"lterms#ageAgg":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":38,"doc_count":2},{"key":28,"doc_count":1},{"key":32,"doc_count":1}]},"avg#balanceAvg":{"value":25208.0}}}
account:GulimallSearchApplicationTests.Account(account_number=970, balance=19648, firstname=Forbes, lastname=Wallace, age=28, gender=M, address=990 Mill Road, employer=Pheast, email=forbeswallace@pheast.com, city=Lopezo, state=AK)
account:GulimallSearchApplicationTests.Account(account_number=136, balance=45801, firstname=Winnie, lastname=Holland, age=38, gender=M, address=198 Mill Lane, employer=Neteria, email=winnieholland@neteria.com, city=Urie, state=IL)
account:GulimallSearchApplicationTests.Account(account_number=345, balance=9812, firstname=Parker, lastname=Hines, age=38, gender=M, address=715 Mill Avenue, employer=Baluba, email=parkerhines@baluba.com, city=Blackgum, state=KY)
account:GulimallSearchApplicationTests.Account(account_number=472, balance=25571, firstname=Lee, lastname=Long, age=32, gender=F, address=288 Mill Street, employer=Comverges, email=leelong@comverges.com, city=Movico, state=MT)
年龄：38==>2
年龄：28==>1
年龄：32==>1
平均薪资：25208.0