第132天学习打卡(ElasticSearch 仿京东搜索 )
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京东搜索
在pom.xml中导入依赖
<!-- 引入fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.75</version>
</dependency>
爬虫
数据问题?数据库获取,消息队列中获取,都可以成为数据源! 爬虫!
爬取数据:(获取请求返回的页面信息,筛选出我们想要的数据就可以了!)
导入依赖pom.xml
<!-- https://mvnrepository.com/artifact/org.jsoup/jsoup -->
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.13.1</version>
</dependency>
utils HtmlParseUtil.java
package com.kuang.utils;
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.net.URL;
public class htmlParseUtil {
public static void main(String[] args) throws IOException {
//获取请求 https://search.jd.com/Search?keyword=java
//前提:需要联网
String url = "https://search.jd.com/Search?keyword=java";
//解析网页 (Jsoup返回Document 对象就是浏览器Document 对象)
Document document = Jsoup.parse(new URL(url), 30000);
//所有你在js中可以使用的方法,这里都能使用
Element element = document.getElementById("J_goodsList");
System.out.println(element.html());
//获取所有的li元素
Elements elements = document.getElementsByTag("li");
//获取元素中的内容 这里el,就是每一个li标签了
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();
System.out.println("=============================");
System.out.println(img);
System.out.println(price);
System.out.println(title);
}
}
}
对上面的代码进行封装
package com.kuang.utils;
import com.kuang.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.net.URL;
import java.util.ArrayList;
import java.util.List;
@Component
public class HtmlParseUtil {
// public static void main(String[] args) throws Exception {
// new HtmlParseUtil().parseJD("java").forEach(System.out::println);
//
// }
public List<Content> parseJD(String keywords) throws Exception {
String url = "https://search.jd.com/Search?keyword=" + keywords;
Document document = Jsoup.parse(new URL(url), 30000);
Element element = document.getElementById("J_goodsList");
System.out.println(element.html());
//获取所有的li元素
Elements elements = document.getElementsByTag("li");
ArrayList<Content> goodsList = new ArrayList<>();
//获取元素中的内容 这里el,就是每一个li标签了
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.setTitle(title);
content.setPrice(price);
content.setImg(img);
goodsList.add(content);
}
return goodsList;
}
}
config ElasticSearchClientConfig.java
package com.kuang.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;
//spring的两步骤
//1.找对象
//2.放到spring中待用
//3.如果是springboot 就先分析源码
@Configuration //相当于xml文件 r
public class ElasticSearchClientConfig {
// spring <beans id = restHighLevelClient class = RestHighLevelClient>
@Bean
public RestHighLevelClient restHighLevelClient(){
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
new HttpHost("127.0.0.1", 9200, "http")));
return client;
}
}
controller
ContentController.java
package com.kuang.controller;
import com.kuang.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;
//请求编写
@RestController
public class ContentController {
@Autowired
private ContentService contentService;
@GetMapping("/parse/{keyword}")
public Boolean parse(@PathVariable("keyword") String keyword) throws Exception {
return contentService.parseContent(keyword);
}
@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.searchPageHighlightBuilder(keyword, pageNo, pageSize);
}
}
IndexController.java
package com.kuang.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class IndexController {
@GetMapping({"/", "/index"})
public String index(){
return "index";
}
}
pojo Content.java
package com.kuang.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Content {
private String title;
private String img;
private String price;
//可以自己添加属性
}
service ContentService.java
package com.kuang.service;
import com.alibaba.fastjson.JSON;
import com.kuang.pojo.Content;
import com.kuang.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;
//业务编写
@Service
public class ContentService {
@Autowired //注入自己的类
private RestHighLevelClient restHighLevelClient;
不能直接使用 @Autowired 需要spring容器
// public static void main(String[] args) throws Exception {
// new ContentService().parseContent("java");
// }
//1.解析数据放入es索引中
public Boolean parseContent(String keywords) throws Exception {
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++) {
// System.out.println(JSON.toJSONString(contents.get(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 sourceBuilder = new SearchSourceBuilder();
//分页
sourceBuilder.from(pageNo);//从第几条数据开始(默认是从0开始)
sourceBuilder.size(pageSize);
//精准匹配
TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
sourceBuilder.query(termQueryBuilder);
sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
//执行搜索
searchRequest.source(sourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
//解析结果
ArrayList<Map<String, Object>> list = new ArrayList<>();
for (SearchHit documentFields : searchResponse.getHits().getHits()) {
list.add(documentFields.getSourceAsMap());
}
return list;
}
//3.获取这些数据实现搜索高亮功能
public List<Map<String, Object>> searchPageHighlightBuilder(String keyword, int pageNo, int pageSize) throws IOException {
if (pageNo<=1){
pageNo = 1;
}
//条件搜索
SearchRequest searchRequest = new SearchRequest("jd_goods");
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
//分页
sourceBuilder.from(pageNo);//从第几条数据开始(默认是从0开始)
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); //多个高亮显示!
highlightBuilder.preTags("<span style='color:red'>");
highlightBuilder.postTags("</span>");
sourceBuilder.highlighter(highlightBuilder);
//执行搜索
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()) {
Map<String, HighlightField> highlightFields = hit.getHighlightFields();
HighlightField title = highlightFields.get("title");
Map<String, Object> sourceAsMap = hit.getSourceAsMap(); //原来的结果
//解析高亮的字段 将原来的字段换为我们高亮的字段即可!
if (title != null){
Text[] fragments = title.fragments();
String n_title = "";
for (Text text : fragments) {
n_title += text;
}
sourceAsMap.put("title", n_title);//将原来的字段用高亮字段替换掉
}
list.add(sourceAsMap);
}
return list;
}
}
application.properties
server.port=9090
# 关闭thymeleaf的缓存
spring.thymeleaf.cache=false
新建一个文件夹,然后在这个文件夹里面使用cmd的命令 下载vue和axios
npm install vue
npm install axios
index.html
<!DOCTYPE html>
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