ElasticSearch（三）实战操作

1、项目结果

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从网页中爬取title、price、img，然后存储到es中，并进行搜索vue渲染出来。

2、创建项目

1、创建SpringBoot项目

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将es版本修改成我们自己对应的版本号：

<elasticsearch.version>7.6.1</elasticsearch.version>

在application.properties配置文件中添加：

server.port=8888
spring.thymeleaf.cache=false

下载前端，部署到我们的项目resources下，

我的gitee仓库地址：https://gitee.com/he-ze__-an/elastic-search

添加依赖：

<!--解析网页jsoup-->
<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.13.1</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>2.0.19</version>
</dependency>

编写配置，创建config包，编写ElasticSearchClientConfig.java，连接我们的es

package com.heze.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;

//1.找对象
//2.放到spring中待用    
@Configuration
public class ElasticSearchClientConfig {
    
    
    
    @Bean
    public RestHighLevelClient restHighLevelClient(){
    
    
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("127.0.0.1", 9200, "http")
                )
        );
        return client;
    }
    
}

3、爬虫

创建utils包，编写HtmlParseUtil.java，实现从网站获取资源：title，img，price

创建pojo包，编写Content.java，包含上面三个属性

package com.heze.utils;

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

/**
 * @author 何泽
 * @version 1.0
 */
@Component
public class HtmlParseUtil {
    
    
    
    public List<Content> parseJD(String keywords) throws IOException {
    
    
        // 获取请求 https://search.jd.com/Search?keyword=java
        String url = "https://search.jd.com/Search?keyword=" + keywords;

        //解析网页 (Jsoup返回的Document就是浏览器Document对象）
        Document document = Jsoup.parse(new URL(url), 30000);
        // 所有你在js中可以使用的方法，这里都能用
        Element elementById = document.getElementById("J_goodsList");
        // 获取所有的li元素
        Elements elements = elementById.getElementsByTag("li");

        ArrayList<Content> goodsList = new ArrayList<>();
        // 获取元素中的内容
        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();

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

得到结果：

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4、存放入es中，以及从中搜索出来

创建service文件夹，创建ContentService.java，下面调用我们注入的restHighLevelClient，实现搜索，高亮

package com.heze.service;

import com.alibaba.fastjson.JSON;
import com.heze.pojo.Content;
import com.heze.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 javax.naming.directory.SearchResult;
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.解析数据放在 es 索引中
    public Boolean parseContent(String keywords) throws IOException {
    
    
        List<Content> contents = new HtmlParseUtil().parseJD(keywords);
        // 把查询的数据放入 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.获取这些数据实现搜索功能
    public List<Map<String, Object>> searchPage(String keyword, int pageNo, int pageSize) throws IOException {
    
    
        if (pageNo <= 1){
    
    
            pageNo = 1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        
        // 分页
        searchSourceBuilder.from(pageNo);
        searchSourceBuilder.size(pageSize);
        
        // 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>");
        searchSourceBuilder.highlighter(highlightBuilder);

        // 精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        searchSourceBuilder.query(termQueryBuilder);
        searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
        
        // 执行搜索
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        
        // 解析结果
        ArrayList<Map<String, Object>> list = new ArrayList<>();
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
    
    
            
            Map<String, HighlightField> highlightFields = documentFields.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();
            // 解析高亮的字段
            if (title != null){
    
    
                Text[] fragments = title.fragments();
                String name = "";
                for (Text text : fragments) {
    
    
                    name += text;
                }
                sourceAsMap.put("title", name); // 高亮字段替换掉原来的内容即可
            }

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

5、使用vue进行渲染

到前端看一下搜索情况：

创建controller包，编写ContentController.java，实现搜索显示结果：

package com.heze.controller;

import com.heze.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}")
    public 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.searchPage(keyword, pageNo, pageSize);
        
    }
    
}

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在随便一个文件中创建vue项目，npm install vue | npm install axios

然后将axios.min.js文件和vue.min.js放在项目resources文件下，做前后端分离

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在页面中添加异步访问，实现渲染数据

<!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 @click.prevent="searchPage" type="submit" 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="item in results">
                        <div class="product-iWrap">
                            <!--商品封面-->
                            <div class="productImg-wrap">
                                <a class="productImg">
                                    <img :src="item.img"> 
                                </a>
                            </div>
                            <!--价格-->
                            <p class="productPrice">
                                <em>{
    
    {
    
    item.price}}</em>
                            </p>
                            <!--标题-->
                            <p class="productTitle">
                                <a v-html="item.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>
<script th:src="@{/js/vue.min.js}"></script>
<script th:src="@{/js/axios.min.js}"></script>
<script>
    new Vue({
    
    
        el:'#app',
        data:{
    
    
            keyword:'',  //搜索关键字
            results:[],  //搜索结果
        },
        methods:{
    
    
            searchPage(){
    
    
                var keyword = this.keyword;
                console.log(keyword)
                axios.get("/search/"+keyword+"/1/10").then(res=>{
    
    
                    console.log(res.data)
                    this.results = res.data;
                })
            }
        }
    })
</script>

</body>
</html>

得到结果：

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总结：就是配置类连接es，从网站扒下三个数据然后存入es，再然后从es中search数据，通过vue渲染出来即可。可以将es当成一个索引库（或者叫数据库），存放内容，然后我们从中获取，crud中的内容，实现我们的搜索功能，暂时还没有具体的感觉，但是理论上说，应该是比mysql这种数据库快很多。

ElasticSearch（三）jd实战