Java Authenticode generates specific code _java

Examples of this article for you to share the Java validation code generated by the sample code for your reference, the details are as follows

Package Com.gonvan.component.captcha;
Import java.awt.*;
Import Java.awt.image.BufferedImage;
Import java.io.IOException;
Import Java.util.HashMap;
Import Java.util.Map;
 
Import Java.util.Random;
Import Javax.imageio.ImageIO;
Import Javax.servlet.ServletOutputStream;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
 
Import javax.servlet.http.HttpSession;
 /** * Created by Yuerzm on 2016/3/14. * * Public class Captchafactory {private static final char[] Code_sequence = "ABCDEFGHIJKLMNOPQRSTUVWXYZ012345678
  9 ". ToCharArray ();
  private static final int default_width = 60;
  private static final int default_height = 20;
  private static final int default_code_len = 4;
  private static final int default_code_x = 13;
  private static final int default_code_y = 16;
  private static final int default_font_size = 18;
  private static final String default_font_family = "Times New Roman"; private static Captchafactory instance = new Captchafactory ();            private int width = default_width;            Defines the picture's width private int height = default_height;           Defines the height private int length = Default_code_len of the picture;            Define the number of validation codes displayed on the picture private int xx = default_code_x;            Define the picture to display the verification code x coordinates private int yy = default_code_y;          Define the picture to display the verification code y-coordinate private int fontsize = Default_font_size;         Defines the font size of the display verification code on the picture private String fontFamily = default_font_family;
  Define the number of validation codes displayed on the picture Private Captchafactory () {} public static captchafactory getinstance () {return instance;  /** * Configuration Width High * * @param w * @param h * @return/public captchafactory configwidthandheight (int
    W, int h) {instance.width = W;
    Instance.height = h;
  return instance; /** * Configuration Coordinates * * @param x * @param y
   * @return */public captchafactory configxy (int x, int y) {instance.xx = x;
    Instance.yy = y;
  return instance;
    /** * Configure font Size * * @param fontsize * @return/public captchafactory configfontsize (int fontsize) {
    Instance.fontsize = fontsize;
  return instance; /** * Configure font * * @param fontFamily * @return/Public captchafactory configfontsize (String fontfamil
    Y) {instance.fontfamily = fontFamily;
  return instance; public void Write (HttpServletRequest request, httpservletresponse response) throws IOException {//Save four-bit number of Authenticode to
    Session.
    Map captcha = Generate ();
    String randomcode = (string) captcha.get ("Captchacode");
 
    BufferedImage buffimg = (bufferedimage) captcha.get ("captchaimg");
    HttpSession session = Request.getsession ();
 
    Session.setattribute ("code", Randomcode);
    Disables image caching.
    Response.setheader ("Pragma", "No-cache"); Response.setheader ("Cache-control", "No-caChe ");
    Response.setdateheader ("Expires", 0);
 
    Response.setcontenttype ("Image/jpeg");
    Outputs the image to the servlet output stream.
    Servletoutputstream outputstream = Response.getoutputstream ();
    Imageio.write (buffimg, "JPEG", outputstream);
  Outputstream.close (); Public map<string, object> generate () throws IOException {//define image buffer BufferedImage buffimg = new B
    Ufferedimage (width, height, bufferedimage.type_int_rgb);
    Graphics gd = Buffimg.getgraphics ();
    Set Background color Gd.setcolor (Getrandcolor (200, 250));
    Gd.fillrect (0, 0, width, height);
    Set the font, the size of the font should be based on the height of the picture.
 
    Gd.setfont (New Font (fontFamily, Font.plain, FontSize));
 
    Create a random number generator class Random Random = new Random ();
    Randomly generated 40 lines of interference, so that the image of the authentication code is not easily detected by other programs.
    Gd.setcolor (Getrandcolor (160, 200));
      for (int i = 0; i < i++) {int x = random.nextint (width);
      int y = random.nextint (height);
      int xl = Random.nextint (12);
      int yl = Random.nextint (12); Gd.drawLine (x, y, X + xl, y + yl);
    The//Randomcode is used to save the randomly generated verification code so that the user can authenticate after logging in.
    StringBuffer Randomcode = new StringBuffer ();
 
    int red = 0, green = 0, blue = 0;
    Randomly produces a length verification code.
      for (int i = 0; i < length; i++) {//Get the randomly generated CAPTCHA number.
      String code = string.valueof (Code_sequence[random.nextint (36)]);
      Produces a random color component to construct a color value, so that the color values of each digit of the output will be different.
      Red = Random.nextint (110);
      Green = Random.nextint (110);
 
      Blue = Random.nextint (110);
      Draws the validation code into the image with a randomly generated color.
      Gd.setcolor (New Color (red +, green +, Blue + 20));
 
      Gd.drawstring (Code, I * xx + 6, yy);
      The resulting random numbers are grouped together.
    Randomcode.append (code);
    } map<string, object> retval = new hashmap<> ();
    Retval.put ("Captchacode", randomcode.tostring ());
    Retval.put ("Captchaimg", buffimg);
  return retval; /** * A given range of random color * * @param FC * Minimum value * @param BC * Maximum * @return color */privat e Color getrandcolor (int FC, int BC) {Random Random = new Random ();
    if (FC > 255) FC = 255;
    if (BC > 255) BC = 255;
    int r = FC + Random.nextint (BC-FC);
    int g = FC + Random.nextint (BC-FC);
    int B = FC + Random.nextint (BC-FC);
  return new Color (R, G, b); }
}

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