用java爬取zol壁纸

• 首先找到壁纸页面
  得到ur：http://desk.zol.com.cn/showpic/1920x1080_4000_10.html
  然后查看源码找到图片的信息
  

<img src="https://desk-fd.zol-img.com.cn/t_s1920x1080c5/g5/M00/01/0E/ChMkJ1bKwfWIK7FbAAiTgt3qkBkAALGggICrlgACJOa906.jpg" width="100" height="75">

分析url可以发现4000这个数字是这张图片的id ，所以只需要将url分为三部分，中间的数字用循环改变然后用线程下载

• 创建一个获取图片url的方法

private String getImgUrl(String u) throws IOException {StringBuilder sb = new StringBuilder();URL url = new URL(u);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestProperty("User-Agent", "Mozilla/5.0 (iPad; CPU OS 11_0 like Mac OS X) AppleWebKit/604.1.34 " +"(KHTML, like Gecko) Version/11.0 Mobile/15A5341f Safari/604.1");InputStream in = connection.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in,"gb2312"));String string = "";while (null != (string = reader.readLine())) {sb.append(string);}string = sb.toString();//从获取的源码中截取图片的URLMatcher matcher = Pattern.compile(imgReg).matcher(string);if (matcher.find()) {string = matcher.group();string = string.substring(10, string.length() - 2);}in.close();return string;}

• 然后创建一个从上面获取的url下载图片的方法

private void getImg(String imgUrl) throws IOException {URL url = new URL(imgUrl);InputStream in = url.openStream();FileOutputStream fo = new FileOutputStream(new File("/image/" + this.number+".jpg"));byte[] by = new byte[1024];int length = 0;System.out.println("开始下载:" +this.number);while ((length = in.read(by, 0, by.length)) != -1) {fo.write(by, 0, length);}in.close();fo.close();}

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java爬取壁纸zol壁纸
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