Java generates Verification Code Image

 

I haven't written a blog for a long time, and I forget that I have an account here. Okay, don't worry. I 'd like to share with you the image code for generating the verification code.

Import java. awt. color; import java. awt. font; import java. awt. graphics2D; import java. awt. image. bufferedImage; import java. io. file; import java. io. IOException; import java. util. random; import javax. imageio. imageIO; import javax. imageio. stream. fileImageOutputStream; public class ValidateCode {/*** Verification Code attribute name */public static final String VALIDATE_CODE_NAME = "validate_code"; char [] codeSequence = {'0', '1 ', '2 ', '3', '4', '5', '6', '7', '8', '9'};/*** width of the Verification Code image. */Private int width = 75;/*** height of the Verification Code image. */Private int height = 20;/*** number of characters in the Verification Code */private int codeCount = 4;/*** xx */private int xx = 0; /*** fontHeight font height */private int fontHeight;/*** codeY */private int codeY; public ValidateCode () {xx = width/(codeCount + 1 ); fontHeight = height-2; codeY = height-4;} public void getValidateImage () {// defines the image bufferBufferedImage buffImg = new BufferedImage (width, height, BufferedImage. TYPE_INT_RGB); Graphics2 D gd = buffImg. createGraphics (); // create a Random number generator class random Random = new Random (); // fill the image with white gd. setColor (Color. WHITE); gd. fillRect (0, 0, width, height); // create a font. The font size depends on the Image height. Font font = new Font ("Fixedsys", Font. BOLD, fontHeight); // set the Font. Gd. setFont (font); // draw a border. Gd. setColor (Color. BLACK); gd. drawRect (0, 0, width-1, height-1); // generates 160 random interference lines, making it difficult for other programs to detect the authentication code in the image. Gd. setColor (Color. BLACK); for (int I = 0; I <10; 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);} // randomCode is used to save the randomly generated Verification Code, so that the user can perform verification after logon. StringBuffer randomCode = new StringBuffer (); int red = 0, green = 0, blue = 0; // a random codeCount verification code is generated. For (int I = 0; I <4; I ++) {// obtain the randomly generated verification code number. String strRand = String. valueOf (codeSequence [random. nextInt (10)]); // generate a random color component to construct the color value, so that the color value of each output number will be different. Red = random. nextInt (255); green = random. nextInt (255); blue = random. nextInt (255); // draw the verification code into the image with a random color. Gd. setColor (new Color (red, green, blue); gd. drawString (strRand, (I + 1) * xx, codeY); // combine the four random numbers. RandomCode. append (strRand);} try {FileImageOutputStream writeImage = new FileImageOutputStream (new File ("c: \ pic.jpg"); ImageIO. write (buffImg, "jpeg", writeImage); writeImage. close ();} catch (IOException e) {// TODO Auto-generated catch blocke. printStackTrace () ;}} public static void main (String [] args) {ValidateCode vc = new ValidateCode (); vc. getValidateImage ();}}