久违的摸鱼时间，看了看B站up主楠哥的内容。

第一次接触爬虫，总的来说是两步走战略，一是获取网页的图片的url，二是根据url下载到本地。

本次的需求是从 https://mp.weixin.qq.com/s?__biz=Mzg2NTAzMTExNg==&mid=2247483699&idx=1&sn=2dd9aeee040d24ad13fe4f2ce5104b05&scene=19#wechat_redirect 下载页面的所有图片到本地。

public static void main(String[] args) throws Exception {
        //第一步 获取url
        String url = "https://mp.weixin.qq.com/s?__biz=Mzg2NTAzMTExNg==&mid=2247483699&idx=1&sn=2dd9aeee040d24ad13fe4f2ce5104b05&scene=19#wechat_redirect";
        Document document = Jsoup.parse(new URL(url), 10000);
        Element element = document.getElementById("activity-detail")
                .getElementById("js_article")
                .getElementById("page-content");
        Elements elementsByTag = element.getElementsByTag("img");
        int id = 0;
        //第二步 下载
        for (Element img : elementsByTag) {
            String src = img.attr("data-src");
            if ("".equals(src)){
                continue;
            }
            //获取输入流
            URL target = new URL(src);
            System.out.println(target);
            URLConnection urlConnection = target.openConnection();
            InputStream inputStream = urlConnection.getInputStream();
            id++;
            OutputStream outputStream = new FileOutputStream("/Users/hushuli/Downloads/imgs/" + id + ".jpg");
            int tmp = 0;
            while ((tmp = inputStream.read()) != -1) {
                outputStream.write(tmp);
            }
            System.out.println(id + "下载完毕");
            inputStream.close();
            outputStream.close();
        }
}