页面展示如下↓

本demo采用前后端分离服务器的方式完成，首先先从后端开始。

• • 1、后端开发
  • • 1.1 如何爬取到京东的数据？
    • 1.2 相关依赖的导入
    • 1.3 Jsoup工具类的编写
    • 1.4 将返回的list加入到elasticSearch中
    • 1.5 将es中的数据返回到前端
  • 2、前端开发
  • • 2.1 页面的编写

1、后端开发

1.1 如何爬取到京东的数据？

 我们使用的是jsoup来解析浏览器的数据，在爬取数据之前，我们要先明白，我们需要的数据是什么，因此让我们来看看京东的商品搜索页面。

 初步看，如果要完成爬取数据到我们的页面上，至少需要获取到商品的标题，图片以及价格，因此F12查看一下网页源码。

 易知，在J_goodsList标签下，一个个li标签中就有我们想要获取的数据，因此我们可以开始编写后端代码。

1.2 相关依赖的导入

 在pom文件引入jsoup和springboot、elasticSearch的依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>pers.fjl</groupId>
    <artifactId>es-jd</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>es-jd</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <!--		自定义es版本依赖否则会出bug-->
        <elasticsearch.version>7.6.1</elasticsearch.version>
    </properties>
    <dependencies>
<!--        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>1.2.56</version>
        </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-thymeleaf</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>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

1.3 Jsoup工具类的编写

 把获取的数据字段封装到Content实体类，加入到list中后返回。

package pers.fjl.utils;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import pers.fjl.po.Content;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

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

    public List<Content> parseJD(String keyword) throws IOException {
        // 获取请求 https://search.jd.com/Search?keyword=java
        String url = "https://search.jd.com/Search?keyword=" + keyword + "&enc=utf-8";
        // 解析网页,返回浏览器document页面对象
        Document document = Jsoup.parse(new URL(url), 30000);
        // 所有js能用的方法在这都可使用
        Element element = document.getElementById("J_goodsList");   // 获取div标签J_goodsList
        System.out.println(element.html());
        // 数据都在li标签中
        Elements lis = element.getElementsByTag("li");

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

        for (Element el : lis) {
            // 网页采用了懒加载，所以在src中无法直接获取
            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;
    }
}

1.4 将返回的list加入到elasticSearch中

返回的list可以选择放入到数据库或者elasticSearch中，这里展示后者。

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

    // 1、解析数据放入es索引中
    public Boolean parseContent(String keyword) throws Exception {
        List<Content> contents = new HtmlParseUtil().parseJD(keyword);
        // 把查询的数据放入到es中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");  // 超市时间2min

        for (int i = 0; i < contents.size(); i++) {
            // 批量添加
            bulkRequest.add(new IndexRequest(ESconst.ES_INDEX)  // 存到jd_goods索引中
                    .source(JSON.toJSONString(contents.get(i)), XContentType.JSON));
        }

        BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        return !bulk.hasFailures();
    }
}

 controller层简单的两个方法，

package pers.fjl.controller;

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 pers.fjl.service.ContentService;

import javax.annotation.Resource;
import java.io.IOException;
import java.util.List;
import java.util.Map;

@CrossOrigin
@RestController
public class ContentController {
    @Resource
    private ContentService contentService;

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

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

}

 请求对应路径调用控制层方法

 此处可看到，数据已经添加到es索引中。

1.5 将es中的数据返回到前端

 其实只需要把需要的数据从mysql中或者es索引中拿出并封装到list返回即可。

package pers.fjl.service;

import com.alibaba.fastjson.JSON;
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.stereotype.Service;
import pers.fjl.po.Content;
import pers.fjl.utils.ESconst;
import pers.fjl.utils.HtmlParseUtil;
import javax.annotation.Resource;
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 {
    @Resource
    private RestHighLevelClient restHighLevelClient;

    // 3、获取这些数据实现搜索高亮功能
    public List<Map<String, Object>> highLightSearchPage(String keyword, int currentPage, int pageSize) throws IOException {
        if (currentPage <= 1) {
            currentPage = 1;
        }

        // 条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        // 分页
        // 从第几条数据开始
        sourceBuilder.from((currentPage - 1) * pageSize);
        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); // 只高亮显示第一个即可
        highlightBuilder.preTags("<span style = 'color:red'>");
        highlightBuilder.postTags("</span>");
        sourceBuilder.highlighter(highlightBuilder);

        // 执行搜素
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        // 解析结果
        ArrayList<Map<String, Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {  //hits中的字段没有被高亮，因此要将es返回highlight中的高亮字段替换到hit中
            // 解析高亮字段
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String, Object> sourceAsMap = hit.getSourceAsMap(); // 原来的字段结果
            if (title != null) {   // 解析高亮字段，将原来字段替换为高亮字段
                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内容
            }
            sourceAsMap.put("id",hit.getId());
            list.add(hit.getSourceAsMap());
        }
        return list;
    }
}

2、前端开发

2.1 页面的编写

 前端代码写的比较简洁，不难看懂，在此不做赘述。

main.js

import Vue from 'vue'
import App from './App.vue'
import router from './router'
import axios from 'axios'
// 导入全局样式表
import './assets/css/global.css'
import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.css'

Vue.use(ElementUI)

Vue.config.productionTip = false
Vue.prototype.$http = axios
// 配置请求的跟路径
axios.defaults.baseURL = 'http://127.0.0.1:9090/'

new Vue({
  router,
  el: '#app',
  render: h => h(App)
}).$mount('#app')

商品详情页的vue

<template>
  <div>
        <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 src="../assets/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="pagination.keyword" type="text" autocomplete="off" value="dd" id="mq"
                                     class="s-combobox-input" aria-haspopup="true">
                            </div>
                          </div>
                          <button type="submit" @click="searchItem" id="searchbtn">搜索</button>
                        </div>
                      </fieldset>
                    </form>
                    <ul class="relKeyTop">
                      <li><a>Java</a></li>
                      <li><a>前端</a></li>
                      <li><a>Linux</a></li>
                      <li><a>大数据</a></li>
                      <li><a>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="#"> vue </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" v-bind:key="result.id">
                  <div class="product-iWrap">
                    <!--商品封面-->
                    <div class="productImg-wrap">
                      <a class="productImg">
                        <img v-bind:src = "result.img">
                      </a>
                    </div>
                    <!--价格-->
                    <p class="productPrice">
                      <em><b>¥</b>{{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： 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>
        </div>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 搜索与添加区域 -->
      <el-pagination align="center"
        class="pagination"
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="pagination.currentPage"
        :page-sizes="[2,5,10,15]"
        :page-size="pagination.pageSize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="100">
      </el-pagination>
    </el-card>
  </div>
</template>

<script>
// import '../assets/js/jquery.min'
export default {
  data () {
    return {
      test: 1,
      pagination: { // 分页相关模型数据
        currentPage: 1, // 当前页码
        pageSize: 10, // 每页显示的记录数
        total: 50, // 总记录数
        keyword: null // 查询条件
      },
      results: [] // 搜索结果
    }
  },
  methods: {
    // 监听 switch 开关状态的改变
    async searchItem () {
      const keyword = this.pagination.keyword
      const pageSize = this.pagination.pageSize
      const currentPage = this.pagination.currentPage
      const { data: res } = await this.$http.get(
        `/search/${keyword}/${currentPage}/${pageSize}`
      )
      console.log(res)
      this.results = res
    },
    // 切换页码
    handleCurrentChange (currentPage) {
      // 设置最新的页码
      this.pagination.currentPage = currentPage
      // 重新调用分页方法进行分页查询
      this.searchItem()
    },
    handleSizeChange (newSize) {
      this.pagination.pageSize = newSize
      this.searchItem()
    }
  }
}
</script>

<style>
  /*@import "../assets/css/style.css";*/
</style>