ElasticSearch——京东商城搜索项目实战

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技术栈：

SpringBoot 2.5.6

ElasticSearch 7.8.0

Vue

1、项目搭建

1、新建一个Spring Boot 项目

2、导入依赖

​ 2.1、 修改Springboot中的ElasticSearch版本和本地的版本一致

<properties>
    <java.version>1.8</java.version>
    <elasticsearch.version>7.8.0</elasticsearch.version>
</properties>

​ 2.2、导入依赖

<dependencies>
    <!-- jsoup解析网页-->
    <dependency>
        <groupId>org.jsoup</groupId>
        <artifactId>jsoup</artifactId>
        <version>1.10.2</version>
    </dependency>
    <!-- fastjson -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.70</version>
    </dependency>
    <!-- ElasticSearch -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    </dependency>
    <!-- thymeleaf -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <!-- web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- devtools热部署 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <!--  -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>
    <!-- lombok 需要安装插件 -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <!-- test -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

3、编写配置文件

# 更改端口，防止冲突
server.port=9090
# 关闭thymeleaf缓存
spring.thymeleaf.cache=false

4、导入静态资源

链接：pan.baidu.com/s/10EF40UUK… 提取码：ot8j

5、测试访问静态页面

@GetMapping({"/","/index"})
public String test(){
    return "index";
}

访问请求：http://localhost:9090/

项目搭建完成！

2、爬取数据

1、通过请求 search.jd.com/Search?keyw… 查询到页面

检查网页：可以看到元素列表id为 J_goodsList，

每个li标签里面存放了每个商品的具体数据：

2、解析页面，获取数据

编写解析页面工具类，获取商品信息：简易版

package com.cheng.utils;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * @Author wpcheng
 * @Create 2021-11-10-9:46
 */
public class HTMLParseUtil {
    public static void main(String[] args) throws IOException {
        //1.获取请求
        String url = "https://search.jd.com/Search?keyword=java";
        //2、解析网页 这里Jsoup返回的就是浏览器的Document对象，在这里可以用js里的方法
        Document document = Jsoup.parse(new URL(url), 30000);
        //获取"J_goodsList"列表
        Element element = document.getElementById("J_goodsList");
        //获取"J_goodsList"列表中的li标签集合
        Elements elements = element.getElementsByTag("li");
        //将li标签集合中的每一个li标签遍历出来，一个el里有一个商品的信息
        for (Element el : elements) {

            //一般图片特别多的网站，所有的图片都是通过延迟加载的，图片地址放在"data-lazy-img"里面
            String img = el.getElementsByTag("img").eq(0).attr("data-lazy-img");//获取商品图片的地址
            String price = el.getElementsByClass("p-price").eq(0).text();//获取商品的价格
            String title = el.getElementsByClass("p-name").eq(0).text();//获取商品的标题

            System.out.println("=====================================");
            System.out.println(img);
            System.out.println(price);
            System.out.println(title);
        }
    }
}

运行：数据获取成功。

编写商品信息的实体类：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Content implements Serializable {
    private static final long serialVersionUID = -8049497962627482693L;
    private String name;
    private String img;
    private String price;

}

将解析页面工具类 HTMLParseUtil 封装成方法：完整版

package com.cheng.utils;

import com.cheng.pojo.Content;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

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

public class HTMLParseUtil {
    public static void main(String[] args) throws Exception {
        //测试
        new HTMLParseUtil().parseJD("刘同").forEach(System.out::println);

    }

    public  List<Content> parseJD(String keyword) throws Exception {

        String url = "https://search.jd.com/Search?keyword="+keyword;
        //2、解析网页 这里Jsoup返回的就是浏览器的Document对象，在这里可以用js里的方法
        Document document = Jsoup.parse(new URL(url), 30000);
        //获取"J_goodsList"列表
        Element element = document.getElementById("J_goodsList");
        //获取"J_goodsList"列表中的li标签集合
        Elements elements = element.getElementsByTag("li");
        //将li标签集合中的每一个li标签遍历出来，一个el里有一个商品的信息
        // list存储所有li下的内容
        List<Content> contents = new ArrayList<>();
        for (Element el : elements) {
            //一般图片特别多的网站，所有的图片都是通过延迟加载的，图片地址放在"data-lazy-img"里面
            String img = el.getElementsByTag("img").eq(0).attr("data-lazy-img");//获取商品图片的地址
            String price = el.getElementsByClass("p-price").eq(0).text();//获取商品的价格
            String title = el.getElementsByClass("p-name").eq(0).text();//获取商品的标题

            Content content = new Content(img, price, title);
            contents.add(content);
        }

        return contents;
    }
}

运行测试工具类：

爬取数据测试成功！

3、编写业务

1、编写配置文件

@Configuration
public class ESHighClientConfig {

    @Bean
    public RestHighLevelClient restHighLevelClient(){
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("127.0.0.1", 9200, "http")));
        return client;
    }

}

2、编写service层

package com.cheng.service;

import com.alibaba.fastjson.JSON;
import com.cheng.pojo.Content;
import com.cheng.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.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.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

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


@Service
public class ContentService {

    @Autowired
    RestHighLevelClient restHighLevelClient;

    //爬取数据放入索引
    public boolean parseContent(String keyword) throws Exception {
        //用自定义解析工具类解析网页，获取数据
        List<Content> contents = HTMLParseUtil.parseJD(keyword);

        //将解析得到的数据批量加入ES中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");
        for (int i = 0; i < contents.size(); i++) {
            bulkRequest.add(
                    new IndexRequest("jd_goods")
                    .source(JSON.toJSONString(contents.get(i)), XContentType.JSON));

        }
        BulkResponse bulkResponse = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);

        return !bulkResponse.hasFailures();//返回true执行成功
    }


    //搜索文档信息
    public  List<Map<String,Object>> search(String keyword,int pageIndex,int pageSize) throws IOException {

        if (pageIndex < 0){
            pageIndex = 0;
        }

        //针对索引构建查询请求
        SearchRequest request = new SearchRequest("jd_goods");

        //构建搜索条件
        SearchSourceBuilder sourceBuilder = SearchSourceBuilder.searchSource();
        //精确查询关键词
        TermQueryBuilder termQuery = QueryBuilders.termQuery("name", keyword);
        //把精确查询放入搜索条件
        sourceBuilder.query(termQuery).timeout(new TimeValue(60, TimeUnit.SECONDS));

        //分页
        sourceBuilder.from(pageIndex);
        sourceBuilder.size(pageSize);

        //把搜索条件放入请求
        request.source(sourceBuilder);

        //执行查询请求
        SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);

        List<Map<String,Object>> list = new ArrayList<>();

        for (SearchHit documentFields : response.getHits().getHits()) {
            //把每个商品信息当做map取出
            Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();
            //放入list集合
            list.add(sourceAsMap);
        }
        return list;
    }

}

3、编写controller层

package com.cheng.controller;

import com.cheng.service.ContentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

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

@RestController
public class TextController {

   @Autowired
   private ContentService contentService;


    @GetMapping({"/","/index"})
    public String test(){
        return "index";
    }


    @GetMapping("/parse/{keyword}")
    public Boolean parse(@PathVariable("keyword") String keyword) throws Exception {
        return contentService.parseContent(keyword);
    }


    @GetMapping("/search/{keyword}/{pageIndex}/{pageSize}")
    public List<Map<String, Object>> parse(@PathVariable("keyword") String keyword,
                                           @PathVariable("pageIndex") Integer pageIndex,
                                           @PathVariable("pageSize") Integer pageSize) throws IOException {
        return contentService.search(keyword,pageIndex,pageSize);
    }

}

4、进行测试

访问请求：http://localhost:9090/parse/java 添加文档：文档数据已添加进ES中

访问请求：http://localhost:9090/search/java/1/20 查询带有关键字“java”的商品信息，并进行分页：查询成功！

4、前后端交互

1、导入vue和axios依赖

2、引入js到html文件中

<script th:src="@{/js/vue.min.js}"></script>
<script th:src="@{/js/axios.min.js}"></script>

3、渲染后的 index.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="utf-8"/>
    <title>狂神说Java-ES仿京东实战</title>
    <link rel="stylesheet" th:href="@{/css/style.css}"/>
    <script th:src="@{/js/jquery.min.js}"></script>
</head>
<body class="pg">
<div class="page">
    <div id="app" class=" mallist tmall- page-not-market ">
        <!-- 头部搜索 -->
        <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>天猫搜索</legend>
                                    <div class="mallSearch-input clearfix">
                                        <div class="s-combobox" id="s-combobox-685">
                                            <div class="s-combobox-input-wrap">
                                                <input v-model="keyword"  type="text" autocomplete="off" 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>狂神说Java</a></li>
                                <li><a>狂神说前端</a></li>
                                <li><a>狂神说Linux</a></li>
                                <li><a>狂神说大数据</a></li>
                                <li><a>狂神聊理财</a></li>
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- 商品详情页面 -->
        <div id="content">
            <div class="main">
                <!-- 品牌分类 -->
                <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="#"> 狂神说 </a></li>
                                        <li><a href="#"> Java </a></li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </form>
                <!-- 排序规则 -->
                <div class="filter clearfix">
                    <a class="fSort fSort-cur">综合<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">人气<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">新品<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">销量<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">价格<i class="f-ico-triangle-mt"></i><i class="f-ico-triangle-mb"></i></a>
                </div>
                <!-- 商品详情 -->
                <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>
                            <!--价格-->
                            <p class="productPrice">
                                <em v-text="result.price"></em>
                            </p>
                            <!--标题-->
                            <p class="productTitle">
                                <a v-html="result.name"></a>
                            </p>
                            <!-- 店铺名 -->
                            <div class="productShop">
                                <span>店铺： 狂神说Java </span>
                            </div>
                            <!-- 成交信息 -->
                            <p class="productStatus">
                                <span>月成交<em>999笔</em></span>
                                <span>评价 <a>3</a></span>
                            </p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script th:src="@{/js/axios.min.js}"></script>
<script>
    new Vue({
        el:"#app",
        data:{
            keyword: '', // 搜索的关键字
            results:[] // 后端返回的结果
        },
        methods:{
            searchKey(){
                var keyword = this.keyword;
                console.log(keyword);
                axios.get('h_search/'+keyword+'/0/20').then(response=>{
                    console.log(response.data);
                    this.results=response.data;
                })
            }
        }
    });
</script>
</body>
</html>

5、关键字高亮

在ContentService里面加上关键字高亮的方法：

原理：用新的高亮字段值覆盖旧的字段值

public List<Map<String, Object>> highlightSearch(String keyword, Integer pageIndex, Integer pageSize) throws IOException {
    //针对构建查询请求
    SearchRequest searchRequest = new SearchRequest("jd_goods");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    // 精确查询
    TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", keyword);
    searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
    //添加查询
    searchSourceBuilder.query(termQueryBuilder);
    // 分页
    searchSourceBuilder.from(pageIndex);
    searchSourceBuilder.size(pageSize);
    // 关键字高亮 
    HighlightBuilder highlightBuilder = new HighlightBuilder();
    highlightBuilder.field("name");
    highlightBuilder.preTags("<span style='color:red'>");
    highlightBuilder.postTags("</span>");
    searchSourceBuilder.highlighter(highlightBuilder);
    //添加查询条件到查询请求
    searchRequest.source(searchSourceBuilder);
    // 执行查询请求
    SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    // 解析结果
    SearchHits hits = searchResponse.getHits();
    List<Map<String, Object>> results = new ArrayList<>();
    for (SearchHit documentFields : hits.getHits()) {
        // 使用新的高亮字段值覆盖旧的字段值
        Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();
        // 高亮字段
        Map<String, HighlightField> highlightFields = documentFields.getHighlightFields();
        HighlightField name = highlightFields.get("name");
        // 开始替换
        if (name != null){
            Text[] fragments = name.fragments();
            //用StringBuilder效率更高
            StringBuilder new_name = new StringBuilder();
            for (Text text : fragments) {
                new_name.append(text);
            }
            sourceAsMap.put("name",new_name.toString());
        }
        results.add(sourceAsMap);
    }
    return results;
}

在index.html中配置高亮效果：

<!--标题-->
<p class="productTitle">
    <a v-html="result.name"></a>
</p>

6、最终效果