121.【ElasticSearch偽京東搜索】

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(一)、搭建環(huán)境

0.啟動ElasticSearch和head和kblian

(1).啟動EslaticSearch (9200)

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

(2).啟動Es-head (9101)

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

(3).啟動 Kibana (5602)

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

1.項目依賴

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.jsxs</groupId>
    <artifactId>Jsxs-es-JD</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Jsxs-es-JD</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <!--    自己定義es版本依賴，保證和本地一致    -->
        <elasticsearch.version>7.6.2</elasticsearch.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <version>2.7.9</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--   引入我們的JSON包     -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>2.0.26</version>
        </dependency>
        <!--      引入Thymeleaf啟動器  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
            <version>2.7.7</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2.啟動測試

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

(二)、爬蟲

1.數(shù)據(jù)從哪里獲取

數(shù)據(jù)庫獲取。
消息隊列中獲取中。
爬蟲

2.導(dǎo)入爬蟲的依賴

tika包解析電影的.jsoup解析網(wǎng)頁

<!--        jsoup解析網(wǎng)頁-->
<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.10.2</version>
</dependency>

3.編寫爬蟲工具類

(1).實體類

package com.jsxs.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @Author Jsxs
 * @Date 2023/6/30 13:06
 * @PackageName:com.jsxs.pojo
 * @ClassName: Content
 * @Description: TODO
 * @Version 1.0
 */

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Content {
    private String title;
    private String img;
    private String price;

}

(2).工具類編寫 (已廢棄?)

package com.jsxs.utils;

import com.jsxs.pojo.Content;
import org.elasticsearch.common.recycler.Recycler;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.springframework.stereotype.Component;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author Jsxs
 * @Date 2023/6/30 12:40
 * @PackageName:com.jsxs.utils
 * @ClassName: HtmlParseUtil
 * @Description: TODO
 * @Version 1.0
 */
@Component
public class HtmlParseUtil {

    public List<Content> parseJD(String keywords) throws Exception {
        // 1.獲得請求
        String url = "https://search.jd.com/Search?keyword="+keywords;
        // 2.解析網(wǎng)頁 返回的document對象就是瀏覽器的Document對象
        Document document = Jsoup.parse(new URL(url), 3000);
        // 3.利用js的Document對象進(jìn)行操作  ->獲取商品整個html頁面
        Element element = document.getElementById("J_goodsList");
        // 4.獲取所有的li元素 是一個集合。
        Elements elements = element.getElementsByTag("li");

        // 創(chuàng)建一個鏈表,用于存放我們爬取到的信息
        ArrayList<Content> contents = new ArrayList<>();

        // 5.獲取元素中的各個內(nèi)容
        for (Element li : elements) {
            // 獲取圖片  這里面加上attr目的是懶加載。
            String img = li.getElementsByTag("img").eq(0).attr("data-lazy-img"); // 爬取懶加載的圖片
            // 獲取價格
            String price = li.getElementsByClass("p-price").eq(0).text();
            // 獲取上坪的價格
            String title = li.getElementsByClass("p-name").eq(0).text();
            // 存放我們爬取到的信息
            contents.add(new Content(title,img,price));
        }
        return contents;
    }

    public static void main(String[] args) throws Exception {
        for (Content java : new HtmlParseUtil().parseJD("碼出高效")) {
            System.out.println(java);
        }
    }
}

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

(3).工具類編寫 - 解決京東防護(hù)

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

package com.jsxs.utils;

import com.jsxs.pojo.Content;
import org.elasticsearch.common.recycler.Recycler;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.springframework.stereotype.Component;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @Author Jsxs
 * @Date 2023/6/30 12:40
 * @PackageName:com.jsxs.utils
 * @ClassName: HtmlParseUtil
 * @Description: TODO
 * @Version 1.0
 */
@Component
public class HtmlParseUtil {

    public List<Content> parseJD(String keywords) throws Exception {
        // 1.獲得請求
        String url = "https://search.jd.com/Search?keyword="+keywords;
        System.out.println(url);

        // 設(shè)置cookie
        Map<String, String> cookies = new HashMap<String, String>();
        cookies.put("thor", "35C0A430DD191386DC5C6605461B820975545DB4E7B5F6CD3717B58D8F3B4CF548ED5F724A0CFF52528BCC4C1382E38FDD39F7714D356D73C80DBC98E351588E74A77B0CB8B5348847042F8AB08B9D4BC87539F45579E34614217BFD76FCEEBEC829173EEA7B4D51FAA162DD62B98376375C46B24B2FAAC96C7C733BC0F3B6165DB89F97C62170FD0838A7F72212B95CD38FC61DEF2B38C36A1F8C252C2809C8");
        //  2.解析網(wǎng)頁 返回的document對象就是瀏覽器的Document對象
        Document document = Jsoup.connect(url).cookies(cookies).get();
        // 3.利用js的Document對象進(jìn)行操作  ->獲取商品整個html頁面
        Element element = document.getElementById("J_goodsList");
        System.out.println("***************"+element);
        // 4.獲取所有的li元素 是一個集合。
        Elements elements = element.getElementsByTag("li");

        // 創(chuàng)建一個鏈表,用于存放我們爬取到的信息
        ArrayList<Content> contents = new ArrayList<>();

        // 5.獲取元素中的各個內(nèi)容
        for (Element li : elements) {
            // 獲取圖片  這里面加上attr目的是懶加載。
            String img = li.getElementsByTag("img").eq(0).attr("data-lazy-img"); // 爬取懶加載的圖片
            // 獲取價格
            String price = li.getElementsByClass("p-price").eq(0).text();
            // 獲取上坪的價格
            String title = li.getElementsByClass("p-name").eq(0).text();
            // 存放我們爬取到的信息
            contents.add(new Content(title,img,price));
        }
        return contents;
    }

    public static void main(String[] args) throws Exception {
        for (Content java : new HtmlParseUtil().parseJD("java")) {
            System.out.println(java);
        }
    }
}

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

4.導(dǎo)入配置類

package com.jsxs.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;

/**
 * @Author Jsxs
 * @Date 2023/6/30 14:13
 * @PackageName:com.jsxs.config
 * @ClassName: ElasticSearchClientConfig
 * @Description: TODO
 * @Version 1.0
 */
@Configuration
public class ElasticSearchClientConfig {

    @Bean
    public RestHighLevelClient restHighLevelClient(){
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("localhost", 9200, "http")));
        return client;
    }
}

(三)、將爬取到的數(shù)據(jù)存放到ES

1.創(chuàng)建Service層

ContentService.java

package com.jsxs.service;

import com.alibaba.fastjson2.JSON;
import com.jsxs.pojo.Content;
import com.jsxs.utils.HtmlParseUtil;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.common.xcontent.XContentType;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

/**
 * @Author Jsxs
 * @Date 2023/6/30 14:08
 * @PackageName:com.jsxs.service
 * @ClassName: ContentService
 * @Description: TODO
 * @Version 1.0
 */
@Service
public class ContentService {

    @Resource
    RestHighLevelClient client;

    public static void main(String[] args) throws Exception {
        System.out.println(new ContentService().parseContent("java"));
    }

    // 1.解析數(shù)據(jù)放入我們的es索引中
    public Boolean parseContent(String keywords) throws Exception {
        List<Content> list = new HtmlParseUtil().parseJD(keywords);
        // 2. 把查詢到的數(shù)據(jù)批量放入es中去
        BulkRequest bulkRequest = new BulkRequest();
        // 3.設(shè)置超時的時間
        bulkRequest.timeout("2s");
        // 4.創(chuàng)建一個新的索引名字叫做 jd_goods ??運行第二次的時候，要把創(chuàng)建庫的語句給刪除掉
        CreateIndexRequest request = new CreateIndexRequest("jd_goods");
        client.indices().create(request, RequestOptions.DEFAULT);
        // 5.批量插入到數(shù)據(jù)中 并設(shè)置id。
        for (int i = 0; i < list.size(); i++) {
            bulkRequest.add(new IndexRequest("jd_goods")
                            .id(""+i+1)
                            .source(JSON.toJSONString(list.get(i)), XContentType.JSON)

            );
        }
        BulkResponse bulk = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        // 如果沒有失敗就返回成功
        return !bulk.hasFailures();
    }
}

2.進(jìn)行測試 (ES是否存放成功)

package com.jsxs;

import com.jsxs.service.ContentService;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;

@SpringBootTest
class JsxsEsJdApplicationTests {

    @Resource
    ContentService contentService;

    @Test
    void contextLoads() throws Exception {
        System.out.println(contentService.parseContent("java"));
    }

}

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

(四)、從ES中分頁讀取數(shù)據(jù) (關(guān)鍵字不能為中文)

切記我們只能讀取到我們ES中存放的數(shù)據(jù),假如進(jìn)行查詢沒有存放在ES的數(shù)據(jù)，我們就會得到空的數(shù)據(jù)。

1.從ES中讀取數(shù)據(jù)

(1).ContentService 層

package com.jsxs.service;

import com.alibaba.fastjson2.JSON;
import com.jsxs.pojo.Content;
import com.jsxs.utils.HtmlParseUtil;
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.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @Author Jsxs
 * @Date 2023/6/30 14:08
 * @PackageName:com.jsxs.service
 * @ClassName: ContentService
 * @Description: TODO
 * @Version 1.0
 */
@Service
public class ContentService {

    @Resource
    RestHighLevelClient client;

    // 1.解析數(shù)據(jù)放入我們的es索引中
    public Boolean parseContent(String keywords) throws Exception {
        List<Content> list = new HtmlParseUtil().parseJD(keywords);
        // 2. 把查詢到的數(shù)據(jù)批量放入es中去
        BulkRequest bulkRequest = new BulkRequest();
        // 3.設(shè)置超時的時間
        bulkRequest.timeout("2s");
        // 4.創(chuàng)建一個新的索引名字叫做 jd_goods
//        CreateIndexRequest request = new CreateIndexRequest("jd_goods");
//        client.indices().create(request, RequestOptions.DEFAULT);
        // 5.批量插入到數(shù)據(jù)中 并設(shè)置id。
        for (int i = 0; i < list.size(); i++) {
            bulkRequest.add(new IndexRequest("jd_goods")
                            .id(i+1+"")
                            .source(JSON.toJSONString(list.get(i)), XContentType.JSON)
            );
        }
        BulkResponse bulk = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        // 如果沒有失敗就返回成功
        return !bulk.hasFailures();
    }

    // 2. 從ES中進(jìn)行搜索內(nèi)容
    public  List<Map<String,Object>> searchesPage(String keywords,int pageNo,int pageSize) throws IOException {

        if (pageNo<=1){
            pageNo=1;
        }

        // 1.條件搜索  ?
        SearchRequest request = new SearchRequest("jd_goods");
         // 2.構(gòu)建搜索條件  ??
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // 3.分頁  ???
        searchSourceBuilder.from(pageNo);
        searchSourceBuilder.size(pageSize);

        // 4. 精確匹配: 第一個參數(shù)是參數(shù)列名,第二個參數(shù)是 搜索的內(nèi)容 ????
        TermQueryBuilder query = QueryBuilders.termQuery("title", keywords);
        searchSourceBuilder.query(query);
        searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        // 5.執(zhí)行搜索 ?????
        request.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(request, RequestOptions.DEFAULT); //這里會得到一個結(jié)果

        // 6.解析結(jié)果  ??????
        SearchHits hits = searchResponse.getHits(); // 這里會獲取到一個對象，對象里面包含著一個hits數(shù)組
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            list.add(hit.getSourceAsMap());
        }
        System.out.println(list);
        return list;
    }
}

(2).ContentController 控制層

package com.jsxs.controller;

import com.jsxs.service.ContentService;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.io.IOException;
import java.util.List;
import java.util.Map;

/**
 * @Author Jsxs
 * @Date 2023/6/30 14:08
 * @PackageName:com.jsxs.controller
 * @ClassName: ContentController
 * @Description: TODO
 * @Version 1.0
 */
@RestController
public class ContentController {

    @Resource
    private ContentService contentService;

    // 普通查詢數(shù)據(jù)
    @GetMapping("/parse/{keywords}")
    public Boolean parse(@PathVariable("keywords") String keywords) throws Exception {
        return contentService.parseContent(keywords);
    }

    // 分頁查詢數(shù)據(jù)加高亮
    @GetMapping("/search/{keyword}/{pageNo}/{pageSize}")
    public List<Map<String,Object>> search(@PathVariable("keyword") String keyword,@PathVariable("pageNo") int pageNo,@PathVariable("pageSize") int pageSize) throws IOException {
        return contentService.searchesPage(keyword,pageNo,pageSize);
    }

    //


}

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

2.錯誤演示 (讀取es中沒有的數(shù)據(jù))

1. 我們在ES中存放的關(guān)鍵字是 java 而我們讀取的關(guān)鍵字是夏裝
121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)
2. 讀取不到夏裝的數(shù)據(jù)

(五)、前后端交互

1.新增兩個js

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

2.修改原本的頁面信息

（1）.修改的前端頁面

index.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">

<head>
    <meta charset="utf-8"/>
    <title>狂神說Java-ES仿京東實戰(zhàn)</title>
    <link rel="stylesheet" th:href="@{/css/style.css}"/>
</head>

<body class="pg">
<div class="page" id="app">
    <div id="mallPage" class=" mallist tmall- page-not-market ">

        <!-- 頭部搜索 -->
        <div id="header" class=" header-list-app">
            <div class="headerLayout">
                <div class="headerCon ">
                    <!-- Logo-->
                    <h1 id="mallLogo">
                        <img th:src="@{/images/jdlogo.png}" alt="">
                    </h1>

                    <div class="header-extra">

                        <!--搜索-->
                        <div id="mallSearch" class="mall-search">
                            <form name="searchTop" class="mallSearch-form clearfix">
                                <fieldset>
                                    <legend>天貓搜索</legend>
                                    <div class="mallSearch-input clearfix">
                                        <div class="s-combobox" id="s-combobox-685">
                                            <div class="s-combobox-input-wrap">
                                                <input v-model="keywords" type="text" autocomplete="off" value="dd" id="mq"
                                                       class="s-combobox-input" aria-haspopup="true">
                                            </div>
                                        </div>
                                        <button type="submit" @click.prevent="searchKey" id="searchbtn">搜索</button>
                                    </div>
                                </fieldset>
                            </form>
                            <ul class="relKeyTop">
                                <li><a>狂神說Java</a></li>
                                <li><a>狂神說前端</a></li>
                                <li><a>狂神說Linux</a></li>
                                <li><a>狂神說大數(shù)據(jù)</a></li>
                                <li><a>狂神聊理財</a></li>
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <!-- 商品詳情頁面 -->
        <div id="content">
            <div class="main">
                <!-- 品牌分類 -->
                <form class="navAttrsForm">
                    <div class="attrs j_NavAttrs" style="display:block">
                        <div class="brandAttr j_nav_brand">
                            <div class="j_Brand attr">
                                <div class="attrKey">
                                    品牌
                                </div>
                                <div class="attrValues">
                                    <ul class="av-collapse row-2">
                                        <li><a href="#"> 狂神說 </a></li>
                                        <li><a href="#"> Java </a></li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </form>

                <!-- 排序規(guī)則 -->
                <div class="filter clearfix">
                    <a class="fSort fSort-cur">綜合<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">人氣<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">新品<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">銷量<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">價格<i class="f-ico-triangle-mt"></i><i class="f-ico-triangle-mb"></i></a>
                </div>

                <!-- 商品詳情 -->
                <div class="view grid-nosku">

                    <div class="product" v-for="result in results">
                        <div class="product-iWrap">
                            <!--商品封面-->
                            <div class="productImg-wrap">
                                <a class="productImg">
                                    <img :src="result.img">
                                </a>
                            </div>
                            <!--價格-->
                            <p class="productPrice">
                                <em><b>￥</b>{{result.price}}</em>
                            </p>
                            <!--標(biāo)題-->
                            <p class="productTitle">
                                <a> {{result.title}} </a>
                            </p>
                            <!-- 店鋪名 -->
                            <div class="productShop">
                                <span>店鋪： 狂神說Java </span>
                            </div>
                            <!-- 成交信息 -->
                            <p class="productStatus">
                                <span>月成交<em>999筆</em></span>
                                <span>評價 <a>3</a></span>
                            </p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<!--前端使用vue,完成前后端分離  ???-->
<script th:src="@{/js/axios.min.js}"></script>
<script th:src="@{/js/vue.js}"></script>
<script>
    new Vue({
        el:'#app',
        data:{
            keywords: '', //搜索的關(guān)鍵字
            results:[] //搜索的結(jié)果
        },
        methods: {
            searchKey() {
                var keyword = this.keywords;
                console.log(keyword);
                //對接后端的接口,異步獲取查詢到的值
                axios.get('search/' + keyword + "/1/10").then(response => {
                    console.log(response);
                    this.results = response.data; // 綁定數(shù)據(jù)
                })
            }
        }
    })
</script>

</body>
</html>

3.在批量插入數(shù)據(jù)的時候把id給注釋掉

121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

4.運行測試成功

讀取的都是es中的數(shù)據(jù),假如es中沒有數(shù)據(jù)的話，就會查不到
121.【ElasticSearch偽京東搜索】,elasticsearch,jenkins,大數(shù)據(jù)

(六)、實現(xiàn)搜索的高亮

1.實現(xiàn)搜索高亮

(1).ContentService 層

package com.jsxs.service;

import com.alibaba.fastjson2.JSON;
import com.jsxs.pojo.Content;
import com.jsxs.utils.HtmlParseUtil;
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.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @Author Jsxs
 * @Date 2023/6/30 14:08
 * @PackageName:com.jsxs.service
 * @ClassName: ContentService
 * @Description: TODO
 * @Version 1.0
 */
@Service
public class ContentService {

    @Resource
    RestHighLevelClient client;

    // 1.解析數(shù)據(jù)放入我們的es索引中
    public Boolean parseContent(String keywords) throws Exception {
        List<Content> list = new HtmlParseUtil().parseJD(keywords);
        // 2. 把查詢到的數(shù)據(jù)批量放入es中去
        BulkRequest bulkRequest = new BulkRequest();
        // 3.設(shè)置超時的時間
        bulkRequest.timeout("2s");
        // 4.創(chuàng)建一個新的索引名字叫做 jd_goods
//        CreateIndexRequest request = new CreateIndexRequest("jd_goods");
//        client.indices().create(request, RequestOptions.DEFAULT);
        // 5.批量插入到數(shù)據(jù)中 并設(shè)置id。
        for (int i = 0; i < list.size(); i++) {
            bulkRequest.add(new IndexRequest("jd_goods")
//                            .id(i+1+"")   盡量去掉id可以
                            .source(JSON.toJSONString(list.get(i)), XContentType.JSON)
            );
        }
        BulkResponse bulk = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        // 如果沒有失敗就返回成功
        return !bulk.hasFailures();
    }

    // 2. 獲取ES數(shù)據(jù)實現(xiàn)基本的搜索功能
    public  List<Map<String,Object>> searchesPage(String keywords,int pageNo,int pageSize) throws IOException {

        if (pageNo<=1){
            pageNo=1;
        }

        // 1.條件搜索
        SearchRequest request = new SearchRequest("jd_goods");
         // 2.構(gòu)建搜索條件
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // 3.分頁
        searchSourceBuilder.from(pageNo);
        searchSourceBuilder.size(pageSize);

        // 4. 精確匹配: 第一個參數(shù)是參數(shù)列名,第二個參數(shù)是 搜索的內(nèi)容
        TermQueryBuilder query = QueryBuilders.termQuery("title", keywords);
        searchSourceBuilder.query(query);
        searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        // 5.執(zhí)行搜索
        request.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(request, RequestOptions.DEFAULT); //這里會得到一個結(jié)果

        // 6.解析結(jié)果
        SearchHits hits = searchResponse.getHits(); // 這里會獲取到一個對象，對象里面包含著一個hits數(shù)組
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            list.add(hit.getSourceAsMap());
        }
        return list;
    }

    // 3.獲取ES數(shù)據(jù)實現(xiàn)高亮+分頁
    public  List<Map<String,Object>> searchesPageHight(String keywords,int pageNo,int pageSize) throws IOException {

        if (pageNo<=1){
            pageNo=1;
        }

        // 1.條件搜索
        SearchRequest request = new SearchRequest("jd_goods");
        // 2.構(gòu)建搜索條件
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // 3.分頁
        searchSourceBuilder.from(pageNo);
        searchSourceBuilder.size(pageSize);


        // 4. 精確匹配: 第一個參數(shù)是參數(shù)列名,第二個參數(shù)是 搜索的內(nèi)容
        TermQueryBuilder query = QueryBuilders.termQuery("title", keywords);
        searchSourceBuilder.query(query);
        searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));


        // 5.配置高亮設(shè)置 ?
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.requireFieldMatch(false); //一個文本中多個關(guān)鍵字只高亮一個關(guān)鍵字
        highlightBuilder.field("title"); //對那個屬性進(jìn)行高亮
        highlightBuilder.preTags("<span style='color:yellow'>"); //文本的前標(biāo)簽
        highlightBuilder.postTags("</span>"); // 文本的后標(biāo)簽
        // 6.執(zhí)行高亮設(shè)置 ??
        searchSourceBuilder.highlighter(highlightBuilder);


        // 7.執(zhí)行搜索
        request.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(request, RequestOptions.DEFAULT); //這里會得到一個結(jié)果

        // 8.將原本文本解析成高亮文本 ???
        SearchHits hits = searchResponse.getHits(); // 這里會獲取到一個對象，對象里面包含著一個hits數(shù)組
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {

            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();  // 原來的結(jié)果
            // 解析高亮的字段,將原來的字段換為我們高亮的字段即可
            if (title!=null){
                Text[] fragments = title.fragments();
                String n_title="";
                for (Text text : fragments) {
                    n_title+=text;
                }
                sourceAsMap.put("title",n_title);  //高亮字段替換掉原來的內(nèi)容即可。
            }
            list.add(sourceAsMap);
        }
        return list;
    }
}

(2).ContentController 層

package com.jsxs.controller;

import com.jsxs.service.ContentService;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.io.IOException;
import java.util.List;
import java.util.Map;

/**
 * @Author Jsxs
 * @Date 2023/6/30 14:08
 * @PackageName:com.jsxs.controller
 * @ClassName: ContentController
 * @Description: TODO
 * @Version 1.0
 */
@RestController
public class ContentController {

    @Resource
    private ContentService contentService;

    // 普通查詢數(shù)據(jù)
    @GetMapping("/parse/{keywords}")
    public Boolean parse(@PathVariable("keywords") String keywords) throws Exception {
        return contentService.parseContent(keywords);
    }

    // 分頁查詢數(shù)據(jù)加高亮
    @GetMapping("/search/{keyword}/{pageNo}/{pageSize}")
    public List<Map<String,Object>> search(@PathVariable("keyword") String keyword,@PathVariable("pageNo") int pageNo,@PathVariable("pageSize") int pageSize) throws IOException {
        return contentService.searchesPageHight(keyword,pageNo,pageSize);
    }
}