Science4JournalSearchPageProcessor.java
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package com.canrd.webmagic.processor;
import com.canrd.webmagic.common.utils.DateUtil;
import com.canrd.webmagic.common.utils.KeywordUtil;
import com.canrd.webmagic.processor.config.Agent;
import com.canrd.webmagic.processor.download.SeleniumDownloader;
import com.canrd.webmagic.processor.pipeline.ArticlePipeline;
import lombok.extern.slf4j.Slf4j;
import org.apache.logging.log4j.core.util.UuidUtil;
import org.springframework.stereotype.Component;
import us.codecraft.webmagic.Page;
import us.codecraft.webmagic.Site;
import us.codecraft.webmagic.Spider;
import us.codecraft.webmagic.processor.PageProcessor;
import us.codecraft.webmagic.selector.Selectable;
import us.codecraft.webmagic.selector.XpathSelector;
import javax.annotation.Resource;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
/**
* @author: xms
* @description: TODO
* @date: 2024/4/1 14:19
* @version: 1.0
*/
@Slf4j
@Component
public class Science4JournalSearchPageProcessor implements PageProcessor {
@Resource
private Science4JournalArticlePageProcessor science4JournalArticlePageProcessor;
@Resource
private SeleniumDownloader seleniumDownloader;
@Resource
private ArticlePipeline articlePipeline;
/**
* 抓取网站的相关配置，包括编码、抓取间隔、重试次数等
*/
private Site site = Site.me().setRetryTimes(3).setSleepTime(5).setUserAgent(Agent.getRandom());
/**
* 定制爬虫逻辑的核心接口，在这里编写抽取逻辑
*
* @param page
*/
@Override
public void process(Page page) {
doArticleList(page);
}
/**
* @param page
*/
private void doArticleList(Page page) {
String url = page.getUrl().get();
/**
* 通过page.getHtml()可以获取到main函数中Spider.create(new BaiduHotSearchPageProcessor()).addUrl中的地址的网页内容
* 1、通过$或css()方法获取到该page html下某元素dom
*/
Selectable selectable = page.getHtml().xpath("//div[@class=' search-result__body titles-results ']").select(new XpathSelector("div[@class='card pb-3 mb-4 border-bottom']"));
List<Selectable> nodes = selectable.nodes();
/**
* 获取到指定的dom后，从这些dom中提取元素内容。
*/
for (int i = 0; i <= nodes.size() - 1; i++) {
String title = nodes.get(i).xpath("//div[@class='card pb-3 mb-4 border-bottom']/div").xpath("//div[@class='d-flex justify-content-between align-items-end']/div/span/h2/a/text()").get();
String time = nodes.get(i).xpath("//div[@class='card-meta align-middle mb-2 text-uppercase text-darker-gray']/span").nodes().get(2).xpath("//time/text()").get();
String link = nodes.get(i).links().get();
if (KeywordUtil.containKeywordsInTitle(title)) {
SimpleDateFormat formatter = new SimpleDateFormat("dd MMMM yyyy", Locale.ENGLISH);
try {
Date publishTimeDateTime = formatter.parse(time);
if (!publishTimeDateTime.before(DateUtil.localDate2Date(DateUtil.parseDate("2000-01-01", DateUtil.DATE)))) {
// page.addTargetRequest(link);
Spider.create(science4JournalArticlePageProcessor)
.addUrl(link)
.addPipeline(articlePipeline)
.setDownloader(seleniumDownloader)
.setUUID(UuidUtil.getTimeBasedUuid().toString())
// 开启5个线程执行，并开始爬取
.thread(1).run();
log.info("关键字文章列表链接：{},标题:{},文章链接：{}", url, title, link);
}
} catch (ParseException e) {
e.printStackTrace();
}
}
}
}
@Override
public Site getSite() {
return site;
}
public static void main(String[] args) {
// 创建一个Spider，并把我们的处理器放进去
Spider.create(new Science4JournalSearchPageProcessor())
// 添加这个Spider要爬取的网页地址
.addUrl("https://www.science.org/journal/science/insights?startPage=0")
.addPipeline(new ArticlePipeline())
// 开启5个线程执行，并开始爬取
.thread(5).run();
}
}