1. 项目准备

1.1 前端资源

一个html页面+css+js；从京东商城爬取简单页面

1.2 ElasticSearch 7.6.2 环境安装

我的前两篇博客可以参考一下：https://www.cnblogs.com/qi-chao/p/15179254.html

1.3 创建Springboot工程

1、导入依赖（注意ElasticSearch版本）

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.76</version>
</dependency>
<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.13.1</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<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.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <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-test</artifactId>
    <scope>test</scope>
    <exclusions>
        <exclusion>
            <groupId>org.junit.vintage</groupId>
            <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
    </exclusions>
</dependency>

2、配置yml

spring:
  thymeleaf:
    cache: false
server:
  port: 9090

3、引入静态资源

4、写个 IndexController 测试下项目正常运行

@Controller
public class IndexController {

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

输入：localhost:9090

2. 爬取京东数据到ES中

2.1 爬取数据

2.1.1 分析网页，得到相应标签

2.1.2 设计Content实体类

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

2.1.3 写个工具类 HtmlParseUtil 测试一下

@Component
public class HtmlParseUtil {

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

    public ArrayList<Content> parseJD(String keywords) throws IOException {
        // 获取请求,前提需要联网，ajax不能获取到！
        String url = "https://search.jd.com/Search?keyword=" + keywords + "&enc=utf-8";
        // 解析网页.（Jsoup返回的Document就是页面对象）
        Document document = Jsoup.connect(url).userAgent("Mozilla/5.0 (Windows NT 5.1; zh-CN) AppleWebKit/535.12 (KHTML, like Gecko) Chrome/22.0.1229.79 Safari/535.12").timeout(30000).get();
        // 所有你在js中可以使用的方法
        Element element = document.getElementById("J_goodsList");
        // 获取所有的li元素
        Elements elements = element.getElementsByTag("li");
        // 获取元素中的内容,el代表每一个li标签

        ArrayList<Content> goodsList = new ArrayList<>();

        for (Element el : elements) {
            // 关于这种图片特别多的网站，都是延迟加载的
            String image = 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.setTitle(title);
            content.setImg(image);
            content.setPrice(price);
            goodsList.add(content);
        }

        return goodsList;
    }
}

可以发现，我们成功拿到了网页内容

2.2 数据入库

2.2.1 ContentService

@Service
public class ContentService {
    @Autowired
    private RestHighLevelClient restHighLevelClient;

    // 1.解析数据 放入ES索引库
    public Boolean parseContent(String keywords) throws IOException {
        List<Content> contents = new HtmlParseUtil().parseJD(keywords);
        // 2.查询的数据批量插入ES中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("3m");
        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();
    }
}

2.2.2 ContentController

@RestController
public class ContentController {
    @Autowired
    private ContentService contentService;

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

2.2.3 创建索引库 jd_goods,测试执行搜索 java 入库

1、输入：localhost:9090/parse/java

2、查看ES数据库,发现成功入库

3. 搜索功能【关键词非高亮】

3.1 ContentController

// 不带高亮
@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.searchPage(keyword, pageNo, pageSize);
}

3.2 ContentService实现搜索功能

 // 2.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 jd_goods = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

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

        // 精准查询
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title",keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        // 执行
        jd_goods.source(sourceBuilder);
        SearchResponse response = restHighLevelClient.search(jd_goods, RequestOptions.DEFAULT);

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

3.4 测试，从数据库拿数据

输入：localhost:9090/search/java/1/10

3.5 前端 Vue

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

<head>
    <meta charset="utf-8"/>
    <title>ES仿京东</title>
    <link rel="stylesheet" th:href="@{/css/style.css}"/>
    <script th:src="@{/js/jquery.min.js}"></script>
</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>java</a></li>
                                <li><a>python</a></li>
                                <li><a>linux</a></li>
                                <li><a>springboot</a></li>
                                <li><a>elasticsearch</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="#"> 阿里巴巴 </a></li>
                                        <li><a href="#"> 字节跳动 </a></li>
                                        <li><a href="#"> 腾讯 </a></li>
                                        <li><a href="#"> 网易 </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><b>¥</b>{{result.price}}</em>
                            </p>
                            <!--标题-->
                            <p class="productTitle">
                                <a> {{result.title}}} </a>
                            </p>
                            <!-- 店铺名 -->
                            <div class="productShop">
                                <span>店铺：神秘商店 </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完成前后端分离-->
<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(){
                let keyword = this.keyword;
                console.log(keyword);
                //对接后端的接口
                axios.get('/search/'+keyword+"/1/10").then(response=>{
                    console.log(response);
                    this.results = response.data;   //绑定数据
                })
            }
        }
    })
</script>

</body>
</html>

测试搜索功能，输入java

4. 关键词高亮

4.1 ContentService 实现搜索高亮功能

// 3.实现搜索高亮功能
public List<Map<String,Object>> searchHighLightPage(String keyword,int pageNo, int pageSize) throws IOException {
    if (pageNo <= 1) {
        pageNo = 1;
    }
    // 条件搜索
    SearchRequest jd_goods = new SearchRequest("jd_goods");
    SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

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

    // 精准查询
    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");
    // 多个高亮
    highlightBuilder.requireFieldMatch(false);
    highlightBuilder.preTags("<span style='color:red'>");
    highlightBuilder.postTags("</span>");
    sourceBuilder.highlighter(highlightBuilder);


    // 执行
    jd_goods.source(sourceBuilder);
    SearchResponse response = restHighLevelClient.search(jd_goods, RequestOptions.DEFAULT);

    ArrayList<Map<String,Object>> list = new ArrayList<>();
    for (SearchHit documentFields : response.getHits().getHits()) {
        // 解析高亮字段
        Map<String, HighlightField> highlightFields = documentFields.getHighlightFields();
        HighlightField title = highlightFields.get("title");
        Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();
        // 原来的字段替换为高亮字段
        if (title!=null){
            Text[] fragments = title.fragments();
            String n_title = "";
            for (Text text : fragments){
                n_title += text;
            }
            sourceAsMap.put("title",n_title);
        }
        list.add(sourceAsMap);
    }
    return list;
}

4.2 修改ContentController

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

4.3 重启测试,发现标题变成html

4.4 在 index.html 中解析title

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

4.5 重启测试成功高亮

5. 项目地址