Shulou(Shulou.com)06/01 Report--

The editor of this article introduces in detail "how Mini Program can simply generate random CAPTCHA". The content is detailed, the steps are clear, and the details are handled properly. I hope this article "how to generate random CAPTCHA by Mini Program" can help you solve your doubts.

/ / randomly generate CAPTCHA / / first step: public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {test (response);} private void test (HttpServletResponse response) throws IOException {int width = 120 / / generate a picture and get a black picture with a width of 120 and a length of 25 BufferedImage img = new BufferedImage (width, height, BufferedImage.TYPE_INT_RGB); Graphics grap = img.getGraphics (); / / get a brush / / fill in the background color grap.setColor (Color.pink) / / set the filled area grap.fillRect (1, 1, width-2, height-2); / / set the border color and fill background color close to who is the color of which property grap.setColor (Color.red); grap.drawRect (0,0, width-1, height-1) / / set the font grap.setFont (new Font ("boldface", Font.BOLD | Font.ITALIC, 18)); / / write to the picture. Hey hey randomly generated the string Random r = new Random (); int p = 15; for (int iTunes 1)

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