Java Generate Verification Code

One: Demand analysis

To generate a verification code using Java:

1: Create a canvas and draw a good background image

2: Draw Random numbers

3: Draw the interfering line

4: Save the In-memory picture to your hard disk

Two: The code is as follows

1 /**2  * 3  */4  PackageCom.hlcui.io;5 6 ImportJava.awt.Color;7 ImportJava.awt.Font;8 ImportJava.awt.Graphics;9 ImportJava.awt.image.BufferedImage;Ten ImportJava.io.File; One Importjava.io.IOException; A ImportJava.util.Random; -  - ImportJavax.imageio.ImageIO; the  - /** -  * @authorAdministrator Generate verification Code -  */ +  Public classValidatecode { -     //defines the width and height of the canvas +      Public Static Final intWIDTH = 300; A      Public Static Final intHEIGHT = 150; at      Public Staticbufferedimage bi; -      Public StaticGraphics G; -      Public StaticRandom r =NewRandom (); -  -     //generate a random number between min to Max -     Private Static intRintMinintmax) { in         intnum = R.nextint (max-min) +min; -         returnnum; to     } +  -     //Drawing background picture the      Public Static voidGeneratebg () { *BI =Newbufferedimage (WIDTH, HEIGHT, Bufferedimage.type_int_rgb); $g =bi.getgraphics ();Panax NotoginsengG.setcolor (NewColor (r (0, 255), R (0, 255), R (0, 255));//set the background color of the canvas -G.fillrect (0, 0, WIDTH, HEIGHT);//Fill the     } +  A     //Draw Random Numbers the      Public Static voidGeneratenum () { +String words = "abcdefghijklmnopqrstuvwxyz0123456789"; -          for(inti = 0; I < 4; i++) { $G.setcolor (NewColor (r (0, 255), R (0, 255), R (0, 255))); $G.setfont (NewFont ("Microsoft Jas Black", Font.plain, 70)); -             Charc = Words.charat (r (0, Words.length ())); -g.DrawString (String.valueof (c), + I *, R (HEIGHT-40)); the         } -     }Wuyi  the     //Draw Interference Lines -      Public Static voidGenerateline () { Wu          for(inti = 0; I < 25; i++) { -G.setcolor (NewColor (r (0, 255), R (0, 255), R (0, 255))); AboutG.drawline (r (0, width), R (0, HEIGHT), R (0, width), R (0, HEIGHT)); $         } -     } -  -     //output pictures from memory to hard disk A      Public Static voidSave ()throwsIOException { +File File =NewFile ("F:/1.png"); theImageio.write (BI, "PNG", file); -System.out.println ("Save done! "); $     } the  the     //Test the      Public Static voidMain (string[] args)throwsIOException { the GENERATEBG (); - generatenum (); in generateline (); the save (); the     } About}

Three: Generate Captcha picture

All of the above codes have been verified!

Java Generate Verification Code