ElasticSearch7.6.2

ElasticSearch7.6.2

本文章中的内容，博主学习至B站《狂神说Java》：https://www.bilibili.com/video/BV17a4y1x7zq
最终成果为爬取京东网站商品内容，插入Elasticsearch的索引中，再从索引中查询出并查询关键字高亮显示到本地网页中。

1，创建springboot项目，导入elasticsearch的依赖以及解析网页jsoup依赖和阿里巴巴的fastjson依赖；

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>	
    <version>7.6.2</version>
</dependency>
<!--解析网页-->
<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.10.2</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.62</version>
</dependency>

2，保证本地的版本和依赖版本一致

<properties>
    <java.version>1.8</java.version>
    <!--对照本地ElasticSearch的版本-->
    <elasticsearch.version>7.6.2</elasticsearch.version>
</properties>

3，创建工具类，用来爬取网页信息

package com.qindi.utils;

import com.qindi.pojo.Content;
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.io.IOException;
import java.net.URL;
import java.util.ArrayList;
@Component
public class HtmlParseUtil {
    
    

    //测试可以拿到数据
    public static void main(String[] args) throws IOException {
    
    
        new HtmlParseUtil().parseJD("玩具"+"&enc=utf-8").forEach(System.out::println);

    }

    public ArrayList<Content> parseJD(String keywords) throws IOException {
    
    
        String url = "https://search.jd.com/Search?keyword="+keywords;
        //解析网页（jsoup返回Document就是浏览器的Document对象）
        Document document = Jsoup.parse(new URL(url), 30000);
        //在js中使用的方法都能用
        Element element = document.getElementById("J_goodsList");

        //获取所有的li元素
        Elements elements = element.getElementsByTag("li");

        ArrayList<Content> goodsList = new ArrayList<>();
        //获取元素的内容，le是每一个li标签
        for (Element el : elements) {
    
    
            String img = el.getElementsByTag("img").eq(0).attr("source-data-lazy-img");
            String price = el.getElementsByClass("p-price").eq(0).text();
            String title = el.getElementsByClass("p-name").eq(0).text();

            Content content = new Content();
            content.setImg(img);
            content.setPrice(price);
            content.setTitle(title);
            goodsList.add(content);
        }
        return goodsList;
    }
}

4，创建实体类，只获取了标题，价格，图片

package com.qindi.pojo;

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

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

5，创建elasticsearch对象，连接本地elasticsearch信息

package com.qindi.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;

@Configuration
public class ElasticSearchClientConfig {
    
    

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

6，将爬取到的数据存储到elasticsearch的索引中，并且实现获取数据实现搜索高亮功能

package com.qindi.service;

import com.alibaba.fastjson.JSON;
import com.qindi.pojo.Content;
import com.qindi.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.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.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
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
    private RestHighLevelClient restHighLevelClient;

    //1.解析数据放入es索引中
    public Boolean parseContent(String keywords) throws IOException {
    
    
        List<Content> contents = new HtmlParseUtil().parseJD(keywords);
        //把查询出的数据放入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 bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);

        return  !bulk.hasFailures();
    }
    
     //2.获取数据实现搜索高亮功能
     public List<Map<String,Object>> searchPageHighlightBuilder(String keyword,int pageNo,int pageSize) throws IOException {
    
    
        if (pageNo<=1){
    
    
            pageNo = 1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);
        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.requireFieldMatch(false);//关闭多个高亮
        highlightBuilder.preTags("<span style='color:red'>");
        highlightBuilder.postTags("</span>");

        sourceBuilder.highlighter(highlightBuilder);

        //执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        //解析结果
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
    
    

            //解析高亮的字段
            Map<String, HighlightField> highlightFields = documentFields.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String,Object> sourceAsMap = documentFields.getSourceAsMap();//原来的结果
            //解析高亮字段
            if (title!=null){
    
    
                Text[] fragments = title.fragments();
                String  n_title = "";
                for (Text text : fragments) {
    
    
                    n_title += text;
                }
                sourceAsMap.put("title",n_title); //高亮字段替换掉原来的内容
            }

            list.add(sourceAsMap);
        }
        return list;
    }
}

7.Controller

package com.qindi.controller;

import com.qindi.service.ContentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

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

@RestController
public class ContentController {
    
    

    @Autowired
    private ContentService contentService;


    @GetMapping("/parse/{keywords}")
    private Boolean parse(@PathVariable("keywords") String keywords) throws IOException {
    
    
        return contentService.parseContent(keywords);
    }


    @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.searchPageHighlightBuilder(keyword,pageNo,pageSize);
    }
}

8，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}"/>

</head>

<body class="pg">
<div class="page" id="app">
    <div id="mallPage" 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" 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>{
    
    {
    
    result.price}}</em>
                            </p>
                            <!--标题-->
                            <p class="productTitle">
                                <a v-html="result.title">  </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>
<!--前端使用vue-->
<script th:src="@{/js/axios.min.js}"></script>
<script th:src="@{/js/vue.min.js}"></script>
<script>
    new Vue({
    
    
        el:'#app',
        data:{
    
    
            keyword:"",//搜索关键字
            results:[]  //搜索结果
        },
        methods:{
    
    
            searchKey(){
    
    
                var keyword =  this.keyword;
                console.log(keyword);
                //对接后端接口
                //axios.get("parse/"+keyword+"&enc=utf-8")
                axios.get("search/"+keyword+"/1/10").then(response=>{
    
    
                    console.log(response);
                    this.results = response.data;
                })
            }
        }
    })
</script>

</body>
</html>