Java 爬知乎某个问题下的所有图片

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package com.yfzz.zhihu3 ;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.Html;import us.codecraft.webmagic.selector.JsonPathSelector;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.URL;import java.net.URLConnection;import java.util.HashSet;import java.util.List;import java.util.UUID;public class ZhihuQuestion implements PageProcessor { private Site site = Site.me().setSleepTime(2000) .setCycleRetryTimes(5) .setRetryTimes(5) .setUserAgent("Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36") .addHeader("authorization", "你的认证信息") .setCharset("UTF-8"); private static String questionID = "37787176"; // 要爬取的问题 ID 号 private static String filePath = "e://zhihu"; // 文件存放路径，程序会自动在此路径后添加一级目录为问题标题 private static int offset = 0; // 偏移量，表示从第 n 个答案开始获取，limit 表示获取多少个(上限为20) private static int count = 0; // 下载到的图片总数 @Override public void process(Page page) { Html html = page.getHtml(); // 得到当前页的所有答案的 ID 号，主要用处是为了判断是否到页尾。 List<String> idList = new JsonPathSelector("$.data[*].id").selectList(page.getRawText()); String title = new JsonPathSelector("$.data[*].question.title").selectList(page.getRawText()).get(0); int getSize = idList.size(); // 当前页获取到的回答个数 if (getSize == 20) { // 将下一页添加到队列中 offset += 20; String url = "https://www.zhihu.com/api/v4/questions/" + questionID + "/answers?include=data%5B%2A%5D.is_normal%2Cadmin_closed_comment%2Creward_info%2Cis_collapsed%2Cannotation_action%2Cannotation_detail%2Ccollapse_reason%2Cis_sticky%2Ccollapsed_by%2Csuggest_edit%2Ccomment_count%2Ccan_comment%2Ccontent%2Ceditable_content%2Cvoteup_count%2Creshipment_settings%2Ccomment_permission%2Ccreated_time%2Cupdated_time%2Creview_info%2Cquestion%2Cexcerpt%2Crelationship.is_authorized%2Cis_author%2Cvoting%2Cis_thanked%2Cis_nothelp%2Cupvoted_followees%3Bdata%5B%2A%5D.mark_infos%5B%2A%5D.url%3Bdata%5B%2A%5D.author.follower_count%2Cbadge%5B%3F%28type%3Dbest_answerer%29%5D.topics&offset=" + offset + "&limit=20&sort_by=default"; page.addTargetRequest(url); } // 根据正则匹配图片地址并去除特殊字符。 // 例: 正则得到的图片链接 : \&quot;https://pic2.zhimg.com/v2-94ae015b8e1bd2e0dc9bdd7d7da6d7ed_r.jpg\&quot; 需要去除特殊字符 &quot; List<String> imgList = html.regex("data-original=\"(.*?)\"").replace("\\\\&quot;", "").all(); // 图片链接去重复 HashSet<String> set = new HashSet<String>(imgList); count += set.size(); System.out.println("正在下载第" + offset + "-" + (offset + getSize) + "个回答的图片，当前页图片数量为：" + set.size() + ",目前总图片数量：" + count); for (String url : set) { String fileName = url.substring(url.lastIndexOf('/') + 1, url.length()); try { String savePath = filePath + "/" + title + "_" + questionID; // 下载路径：指定路径/标题/问题ID downloadPicture(url, savePath, fileName); } catch (Exception e) { e.printStackTrace(); } } } public static void downloadPicture(String urlString, String savePath, String filename) throws Exception { File file = new File(savePath + File.separator + filename); if (!new File(savePath).exists()) { System.out.println("下载目录不存在，已创建：" + savePath); new File(savePath).mkdirs(); } if (file.exists()) { System.out.println("文件已存在，跳过该文件：" + file.getName()); return; } OutputStream os = new FileOutputStream(file); // 构造URL URL url = new URL(urlString); // 打开连接 URLConnection con = url.openConnection(); //设置请求超时为5s con.setConnectTimeout(5 * 1000); // 输入流 InputStream is = con.getInputStream(); // 1K的数据缓冲 byte[] bs = new byte[1024]; // 读取到的数据长度 int len; // 开始读取 while ((len = is.read(bs)) != -1) { os.write(bs, 0, len); } // 完毕，关闭所有链接 os.close(); is.close(); } @Override public Site getSite() { return site; } public static void main(String[] args) throws Exception { Spider.create(new ZhihuQuestion()). thread(1). addUrl("https://www.zhihu.com/api/v4/questions/" + questionID + "/answers?include=data%5B%2A%5D.is_normal%2Cadmin_closed_comment%2Creward_info%2Cis_collapsed%2Cannotation_action%2Cannotation_detail%2Ccollapse_reason%2Cis_sticky%2Ccollapsed_by%2Csuggest_edit%2Ccomment_count%2Ccan_comment%2Ccontent%2Ceditable_content%2Cvoteup_count%2Creshipment_settings%2Ccomment_permission%2Ccreated_time%2Cupdated_time%2Creview_info%2Cquestion%2Cexcerpt%2Crelationship.is_authorized%2Cis_author%2Cvoting%2Cis_thanked%2Cis_nothelp%2Cupvoted_followees%3Bdata%5B%2A%5D.mark_infos%5B%2A%5D.url%3Bdata%5B%2A%5D.author.follower_count%2Cbadge%5B%3F%28type%3Dbest_answerer%29%5D.topics&offset=0&limit=20&sort_by=default") .run(); }}