快速入門Java爬蟲、全文搜索引擎Elasticsearch，分析實戰專案：仿京東搜索（二）-有解無憂

hi大家好，今天我把上周的內容繼續講完！！

接著上次的部分，今天我們分享的是Elaticsearch全文搜索引擎，Elasticsearch是基于Lucene做了一些封裝和增強，

首先我們先介紹一下Elasticsearch，簡稱es是一個開源的高擴展的分布式全文搜索引擎，它可以近乎實時的存盤、檢索資料；本身它擴展性很好，可以擴展到上百臺服務器，處理PB級別(大資料時代)的資料，es也使用java開發并使用Lucene作為其核心來實作所有索引和搜索的功能，但是它的目的是通過簡單的Restful API 來隱藏Luncene的復雜性，從而讓全文搜索變得簡單，

首先大家先去下載好Elaticsearch，訪問 Elasticsearch 官網下載安裝包Download Elasticsearch | Elastichttps://www.elastic.co/cn/downloads/elasticsearch得到下載的檔案后，在bin目錄下打開cmd，start elasticsearch，再用瀏覽器打開9200埠，出現以下界面代表運行成功，

在這里進行一些小擴展，這里我們可以使用一些擴展插件如head和Kibana，Kibana是一個針對Elasticsearch的開源分析及及可視化平臺，用來搜索、查看互動存盤在Elasticsearch索引中的資料，簡單的來說，這些擴展插件是可以用來幫助我們具體學習Elaticsearch的，畢竟是可視化，

如果大家想具體了解Elaticesearch的功能，可以去看官網的開發檔案，像里面的·IK分詞器、高亮都是需要掌握的，

我今天是展示專案所以不多說，首先我們需要把上篇文章的爬蟲包裝成一個類，方便我們呼叫，畢竟我們在使用es前必須保證里面有資料才對，

專案的所有檔案都如圖所示， yaml檔案我配置的埠是8081；在用之前得保證你有相關的jsoup和es得maven依賴，上周已經提供，以下是上周的爬蟲類utils下的jsoupService

package com.liu.utils;

import com.liu.pojo.goodJD;
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;

@Component
public class jsouputils {
//    public static void main(String[] args) throws Exception {
        https://search.jd.com/Search?keyword=java
//        new jsouputils().parsJD("java").forEach(System.out::println);
//    }
    public List<goodJD> parsJD(String keywords) throws Exception {
            String url ="https://search.jd.com/Search?keyword="+keywords;
            Document document = Jsoup.parse(new URL(url), 900000000);
            Element element = document.getElementById("J_goodsList");
            Elements elements = element.getElementsByTag("li");
        ArrayList<goodJD> goodJDlist = new ArrayList<>();
        for (Element el : elements) {
           String img = el.getElementsByTag("img").eq(0).attr("data-lazy-img");
           String price = el.getElementsByClass("p-price").eq(0).text();
           String title = el.getElementsByClass("p-name").eq(0).text();
           String shopnum = el.getElementsByClass("p-shop").eq(0).text();
            goodJD goodJD = new goodJD();
                goodJD.setTitle(title);
                goodJD.setImg(img);
                goodJD.setPrice(price);
                goodJD.setShopnum(shopnum);
            goodJDlist.add(goodJD);
            }
        return goodJDlist;
    }
}

接下來我們需要在config目錄下加一個ESconfig類，目的是為了連接上我們的ES，127.0.0.1：9200代表本地路徑加埠，具體代碼如下所示：

package com.liu.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 ESconfig {

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

接下來就是最難的service層了，具體代碼如下：

package com.liu.service;

import com.alibaba.fastjson.JSON;
import com.liu.pojo.goodJD;
import com.liu.utils.jsouputils;
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.QueryBuilder;
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 javax.naming.directory.SearchResult;
import javax.swing.text.Highlighter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Service
public class JsoupService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    public Boolean parseContent(String keywords) throws Exception {
        List<goodJD> goodJDS = new jsouputils().parsJD(keywords);

        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");

        for (int i = 0; i < goodJDS.size(); i++) {
            bulkRequest.add((new IndexRequest("jd_good")
            .source(JSON.toJSONString(goodJDS.get(i)), XContentType.JSON)
            ));
        }
 BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);

        return !bulk.hasFailures();
    }

    public List<Map<String,Object>> seachPage(String keywords,
                                              int pageNo,
                                              int pageSize) throws IOException {
        if(pageNo<=1){
            pageNo=1;
        }

        SearchRequest searchRequest = new SearchRequest("jd_good");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        searchSourceBuilder.from(pageNo);
        searchSourceBuilder.size(pageSize);

        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keywords);

        searchSourceBuilder.query(termQueryBuilder);

        searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        ArrayList<Map<String,Object>>list = new ArrayList<>();
        for (SearchHit documentFields : searchResponse.getHits()) {
            list.add(documentFields.getSourceAsMap());
        }
        return  list;
    }

    public List<Map<String,Object>> seachPagehighlighter(String keywords,
                                              int pageNo,
                                              int pageSize) throws IOException {
        if(pageNo<=1){
            pageNo=1;
        }

        SearchRequest searchRequest = new SearchRequest("jd_good");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        searchSourceBuilder.from(pageNo);
        searchSourceBuilder.size(pageSize);

        TermQueryBuilder termQueryBuilder =
                QueryBuilders.termQuery("title", keywords);

        searchSourceBuilder.query(termQueryBuilder);

        searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.requireFieldMatch(false);
        highlightBuilder.preTags("<span style='color:red'>");
        highlightBuilder.postTags("</span>");
        searchSourceBuilder.highlighter(highlightBuilder);

        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse =
                restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

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




        for (SearchHit documentFields : searchResponse.getHits()) {
            Map<String, HighlightField> highlightFields =
                    documentFields.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();




            if(title!=null){
                Text[] fragments = title.fragments();
                String ntitle="";
                for (Text text : fragments) {
                    ntitle +=text;
                }
                sourceAsMap.put("title",ntitle);
            }
            list.add(sourceAsMap);
        }
        return  list;
    }
}

對應service層我來進行一下簡單的分析，

BulkRequest是插入多個資料時候使用，連接2分鐘

高亮操作：

接著是controllerr層

JsoupController類：

package com.liu.controller;

import com.liu.service.JsoupService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
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 JsoupController {

    @Autowired
    private JsoupService jsoupService;

    @CrossOrigin
    @GetMapping("/parse/{keywords}")
    public  Boolean parse(@PathVariable String keywords) throws Exception {
        return jsoupService.parseContent(keywords);
    }

    @CrossOrigin
    @GetMapping("/search/{keywords}/{pageNo}/{pageSize}")
    public  List<Map<String,Object>> search(
                                         @PathVariable  String keywords,
                                         @PathVariable   int pageNo,
                                         @PathVariable    int pageSize) throws IOException {

        return jsoupService.seachPagehighlighter(keywords,pageNo,pageSize);

    }
}

indexjion類：

package com.liu.controller;


import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class indexjion {

    @GetMapping({"/", "/index"})
    public String toindex(){

        return "index";
    }
}

前端界面

index.html：

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

<head>
    <meta charset="utf-8"/>
    <title>Java-ES仿京東實戰</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>京東搜索</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  @click.prevent="searchkey" type="submit" id="searchbtn">搜索</button>
                                    </div>
                                </fieldset>
                            </form>
                            <ul class="relKeyTop">
                                <li><a>java</a></li>
                                <li><a>Vue</a></li>
                                <li><a>Rdeis</a></li>
                                <li><a>Docker</a></li>
                                <li><a>spring</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="#"> 實惠 </a></li>
                                        <li><a href="#"> 人人 </a></li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </form>

                <!-- 排序規則 -->
                <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>{{result.price}}</em>
                            </p>
                            <!--標題-->
                            <p class="productTitle">
                                <a v-html="result.title"></a>
                            </p>
                            <!-- 店鋪名 -->
                            <div class="productShop">
                                <span>{{result.shopnum}}</span>
                            </div>
                            <!-- 成交資訊 -->
                            <p class="productStatus">
                                <span>月成交<em>999筆</em></span>
                                <span>評價 <a>3</a></span>
                            </p>
                        </div>
                    </div>
                </div>
                <div class="filter clearfix" >
                    <a class="fSort fSort-cur"><button @click.prevent="pageone" type="submit" >1</button ><i class="f-ico-arrow-d"></i></a>
                    <a class="fSort" ><button @click.prevent="pagetwo" type="submit" >2</button ><i class="f-ico-arrow-d"></i></a>
                    <a class="fSort"><button @click.prevent="pagethree" type="submit" >3</button ><i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">4<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">5<i class="f-ico-triangle-mt"></i><i class="f-ico-triangle-mb"></i></a>
                </div>
            </div>
        </div>
    </div>
</div>


<script src="https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.min.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<!--<script th:src="@{/js/vue.min.js}"></script>-->
<!--<script th:src="@{/js/axios.min.js}"></script>-->
<script>

    new Vue({
        el: '#app',
        data: {
            keyword: '',
            results: []
        },
        methods: {
            searchkey: function (){
               var keyword= this.keyword;
               axios.get('search/'+keyword+"/1/10").then(response=>{
                   console.log(response.data);
                   this.results=response.data;

               })
            },
            pageone :function (){
                var keyword= this.keyword;
                axios.get('search/'+keyword+"/1/10").then(response=>{
                    console.log(response.data);
                    this.results=response.data;
                })
            },
            pagetwo :function (){
                var keyword= this.keyword;
                axios.get('search/'+keyword+"/2/10").then(response=>{
                    console.log(response.data);
                    this.results=response.data;
                })
            },
            pagethree :function (){
                var keyword= this.keyword;
                axios.get('search/'+keyword+"/3/10").then(response=>{
                    console.log(response.data);
                    this.results=response.data;
                })
            }

        }
    })
</script>

</body>
</html>

最終實作結果：

首頁：

輸入java之后：（爬蟲爬的java資料！！！）

可以按下一頁調節：

轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/394193.html

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