（四）ElasticSearch-实战模拟京东搜索

1.Jsoup获取数据

• pom

        <!--jsoup-->
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
        </dependency>

• HtmlParseUtil

import com.mine.esjd.pojo.Content;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

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

public class HtmlParseUtil {

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

    /**
     * parseJD
     *
     * @return
     */
    public static List<Content> parseJD(String keyword) {
        List<Content> list = new ArrayList<>();
        String url = "https://search.jd.com/Search?keyword=" + keyword;
        //Document document = Jsoup.parse(new URL(url), 30000);
        Document document = null;
        try {
            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();
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (document == null) {
            return list;
        }
        Element element = document.getElementById("J_goodsList");
        Elements elements = element.getElementsByTag("li");
        for (Element el : elements) {
            String img = el.getElementsByTag("img").eq(0).attr("data-lazy-img");
            String pricce = el.getElementsByClass("p-price").eq(0).text();
            String title = el.getElementsByClass("p-name").eq(0).text();
            list.add(new Content(title, pricce, img));
        }
        return list;
    }
}

2.添加数据至ES

• pom

        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!-- fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </dependency>
        <!-- elasticsearch -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <!--thymeleaf -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <!-- web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--jsoup-->
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
        </dependency>
        <!--hutool-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
        </dependency>

• 配置Bean

@Configuration
public class ESConfig {

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

• pojo

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Content {

    private String title;
    private String price;
    private String img;
}

• Service

public interface ContentService {

    /**
     * 添加数据至ES
     *
     * @param keyword
     * @return
     */
    public boolean parse(String keyword);
}

@Service
public class ContentServiceImpl implements ContentService {

    Snowflake snowflake = IdUtil.getSnowflake(1, 1);

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    @Override
    public boolean parse(String keyword) {
        List<Content> contents = HtmlParseUtil.parseJD(keyword);
        BulkRequest request = new BulkRequest();
        request.timeout("30s");
        for (int i = 0; i < contents.size(); i++) {
            request.add(new IndexRequest("jd_goods").id(snowflake.nextIdStr()).source(JSON.toJSONString(contents.get(i)), XContentType.JSON));
        }
        try {
            BulkResponse response = restHighLevelClient.bulk(request, RequestOptions.DEFAULT);
            return !response.hasFailures();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

}

• Controller

@RestController
public class ContentController {

    @Autowired
    private ContentService contentService;

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

• 访问http://localhost:9090/parse/{yourword}
  

3.搜索结果

• 前端代码

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

<head>
    <meta charset="utf-8"/>
    <title>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>Java</a></li>
                                <li><a>前端</a></li>
                                <li><a>Linux</a></li>
                                <li><a>大数据</a></li>
                                <li><a>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="#">  </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><!--<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>

<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() {
                var keyword = this.keyword;
                console.log(keyword);
                axios.get('search/' + keyword + '/1/30').then(response=>{
                    this.results=response.data;
                    console.log(this.results);
                });
            }
        }
    })
</script>

</body>
</html>

• Controller

@RestController
public class ContentController {

    @Autowired
    private ContentService contentService;

    @GetMapping("/search/{keyword}/{pageNo}/{pageSize}")
    public List<Map<String, Object>> search(@PathVariable("keyword") String keyword,
                                            @PathVariable("pageNo") Integer pageNo,
                                            @PathVariable("pageSize") Integer pageSize
    ) {
        return contentService.search(keyword, pageNo, pageSize);
    }
}

• Service

public interface ContentService {

    /**
     * 从ES查询数据
     *
     * @param keyword
     * @param pageNo
     * @param pageSize
     * @return
     */
    public List<Map<String, Object>> search(String keyword, Integer pageNo, Integer pageSize);
}

@Service
public class ContentServiceImpl implements ContentService {

    Snowflake snowflake = IdUtil.getSnowflake(1, 1);

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    @Override
    public List<Map<String, Object>> search(String keyword, Integer pageNo, Integer pageSize) {
        List<Map<String, Object>> list = new ArrayList<>();
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //分页
        sourceBuilder.from((pageNo - 1) * pageSize);
        sourceBuilder.size(pageSize);

        //精准查询
        //TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);

        //match查询
        MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("title", keyword);
        sourceBuilder.query(matchQueryBuilder);
        sourceBuilder.timeout(TimeValue.timeValueSeconds(30));

        //高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.preTags("<span style='color:red'>");
        highlightBuilder.postTags("</span>");
        highlightBuilder.field("title");
        sourceBuilder.highlighter(highlightBuilder);
        //执行搜索
        searchRequest.source(sourceBuilder);
        try {
            SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
            for (SearchHit searchHit : searchResponse.getHits().getHits()) {
                //高亮置换
                Map<String, HighlightField> highlightFields = searchHit.getHighlightFields();
                Text[] fragments = highlightFields.get("title").fragments();
                String highlightTitle = "";
                if (null != fragments && fragments.length > 0) {
                    for (int i = 0; i < fragments.length; i++) {
                        highlightTitle += fragments[i];
                    }
                }
                Map<String, Object> asMap = searchHit.getSourceAsMap();
                if (StrUtil.isNotEmpty(highlightTitle)) {
                    asMap.put("title", highlightTitle);
                }
                list.add(asMap);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return list;
    }
}

• 测试结果