Java Generate Verification Code

1 Importjava.awt.*;2 ImportJava.awt.image.BufferedImage;3 ImportJava.io.*;4 ImportJava.util.Random;5 ImportJavax.imageio.ImageIO;6  7  Public classValidationcode {8  9     //The character set of the graphic verification Code, the system will randomly select some characters from this string as the verification codeTen     Private StaticString codechars = "% #23456789abcdefghkmnpqrstuvwxyzABCDEFGHKLMNPQRSTUVWXYZ"; One   A     //returns a random color (color object) -     Private StaticColor Getrandomcolor (intMincolor,intMaxcolor) { -Random random =NewRandom (); the         //save Mincolor Max no more than 255 -         if(Mincolor > 255) -Mincolor = 255; -         //save Mincolor Max no more than 255 +         if(Maxcolor > 255) -Maxcolor = 255; +         //get a red random color value A         intRed = Mincolor + random.nextint (Maxcolor-mincolor); at         //get a green random color value -         intGreen = Mincolor + random.nextint (Maxcolor-mincolor); -         //get a blue random color value -         intBlue = Mincolor + random.nextint (Maxcolor-mincolor); -         return NewColor (red, green, blue); -     } in   -     protected Static voidGetvalidationcode ()throwsIOException { to         Try { +             //get the length of the Verification Code collection -             intCharslength =codechars.length (); the             //set the length and width of the graphics verification Code (size of the graphic) *             intwidth = all, height = 30; $BufferedImage image =Newbufferedimage (width, height, bufferedimage.type_int_rgb);Panax NotoginsengGraphics g = image.getgraphics ();//get a Graphics object for output text -Random random =NewRandom (); theG.setcolor (Getrandomcolor (180, 250));//randomly set the color to fill +G.fillrect (0, 0, width, height);//Fill graphic Background A             //set the initial font theG.setfont (NewFont ("Times New Roman", font.italic, height)); +G.setcolor (Getrandomcolor (120, 180));//randomly set font color -             //used to save the last randomly generated verification code $StringBuilder Validationcode =NewStringBuilder (); $             //random font for verification codes -String[] FontNames = {"Times New Roman", "Book Antiqua", "Arial" }; -             //randomly generate 3 to 5 verification codes the              for(inti = 0; I < 3 + random.nextint (3); i++) { -                 //randomly set the font of the character of the current CaptchaWuyiG.setfont (NewFont (Fontnames[random.nextint (3)] (font.italic, height)); the                 //randomly get the character of the current verification code -                 CharCodechar =Codechars.charat (Random.nextint (charslength)); Wu validationcode.append (Codechar); -                 //randomly sets the color of the current CAPTCHA character AboutG.setcolor (Getrandomcolor (10, 100)); $                 //output the captcha characters on the graph, and X and Y are randomly generated -g.DrawString (String.valueof (Codechar), i + random.nextint (7), Height-random.nextint (6)); -             } -File File =NewFile ("D:\\code.png");  AImageio.write (Image, "PNG", file);  + System.out.println (validationcode.tostring ()); the             //byte[] data = ((DataBufferByte) Image.getdata (). Getdatabuffer ()). GetData (); - g.dispose (); $}Catch(Exception e) { the E.printstacktrace ();  the         } the     } the   -      Public Static voidMain (string[] args)throwsioexception{ in Getvalidationcode (); the     } the}

Java Generate Verification Code