public class DownWallpaper extends JFrame implements ActionListener{

    private JButton down = null;
    
    public DownWallpaper(){
        down =  new JButton("下載手機桌布");
        down.setFont(new Font("微軟雅黑",Font.ITALIC,20));
        down.addActionListener(this);
        this.setResizable(false);
        this.add(down);
        this.setTitle("高清桌布下載");
        this.setSize(250, 150);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
       if (e.getSource()==down) {
           try {
               JOptionPane.showMessageDialog(this, "正在下載請勿關閉主窗體！");
               JOptionPane.showMessageDialog(this, "詳細資訊請檢視：https://sj.enterdesk.com/");
               JOptionPane.showMessageDialog(this, "下載完成後請到：d:/img下檢視");
            load("https://sj.enterdesk.com/");
        } catch (Exception e1) {
            e1.printStackTrace();
        }
           
       } 
    }
    public static void main(String[] args) {
         new DownWallpaper();
    
    }
    
    
    /**
     * 載入連結
     * @param urls
     * @throws Exception
     */
    public static void load(String urls) throws Exception{
        Connection connect = Jsoup.connect(urls);
        Document document = connect.get();
        Elements links = document.getElementsByTag("img");
        //迴圈爬取圖片
        for(Element link : links){
            String url = link.attr("src");//下載的url
            String endWith = url.substring(url.lastIndexOf("."));//檔案字尾名
            String fileName = link.absUrl("alt").substring(link.absUrl("alt").lastIndexOf("/"));//檔名
            download(url,endWith,fileName);
        }
        //獲取所有的<li>
        Elements select = document.select("a");
        Elements addClass = select.addClass("next_p");
        for (Element element : addClass) {
            if (element.text().equals("下一頁")) {
                //獲取超連結
                String attr = element.attr("href");
                //遞迴迴圈下載
                load(attr);
            }else{
                continue;
            }
              
        }
       
    }
    
    /**
     * 下載圖片
     * @param url
     */
    public static void download(String url,String endWith,String fileName) throws Exception{
            File file = new File("d:/img/");
            if (!file.exists()){
                file.mkdir();
            }else{
                file.delete();
                file.mkdir();
            }
            URL url2 = new URL(url);
            InputStream is = url2.openConnection().getInputStream();
            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file.getPath()+fileName+endWith));
            byte[] bs = new byte[2048*2048];
            while((is.read(bs))!=-1){
                bos.write(bs);
            }
            bos.flush();
           if(is != null) is.close();
           if(bos != null) bos.close();
    }


}

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