ASP. net mvc module and component (2)-custom image verification code,
Simply and directly, Let's go straight to the theme!
The following is the source code of a Verification Code class that generates random combinations of numbers and letters:
Using System; using System. drawing; using System. drawing. imaging; using System. web. UI; using System. drawing. drawing2D; using System. IO; namespace Forcheng. code {// <summary> /// the class that generates the verification Code /// </summary> public class ValidateCode {/// <summary> /// generate the verification Code /// </summary> /// <param name = "length"> specify the length of the Verification Code </param> /// <returns> </returns> public string CreateValidateCode (int length) {const string maid = "23456789 abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ"; string validateStr = ""; int n = validateTemplate. length-1; // set the random value generator int seekSeek = unchecked (int) DateTime. now. ticks); Random seekRand = new Random (seekSeek); int beginSeek = 0; // generate a Random verification code for (int I = 0; I <length; I ++) {beginSeek = seekRand. next (0, n); validateStr + = validateTemplate. substring (beginSeek, 1);} return validateStr ;} /// <summary> /// the image for creating the verification code /// </summary> /// <param name = "containsPage"> the page object to be output </param> /// <param name = "validateNum"> Verification Code </param> public byte [] CreateValidateGraphic (string validateCode) {Bitmap image = new Bitmap (int) Math. ceiling (validateCode. length * 13.0), 22); Graphics g = Graphics. fromImage (image); try {// generate Random generator random Random = new Random (); // clear the image background color g. clear (Color. white); // The interference line of the picture. for (int I = 0; I <25; I ++) {int x1 = random. next (image. width); int x2 = random. next (image. width); int y1 = random. next (image. height); int y2 = random. next (image. height); g. drawLine (new Pen (Color. silver), x1, y1, x2, y2);} Font font = new Font ("Arial", 12, (FontStyle. bold | FontStyle. italic); LinearGradientBrush brush = new LinearGradientBrush (new Rectangle (0, 0, image. width, image. height), Color. blue, Color. darkRed, 1.2f, true); g. drawString (validateCode, font, brush, 3, 2); // foreground disturbance of the image to be painted for (int I = 0; I <100; I ++) {int x = random. next (image. width); int y = random. next (image. height); image. setPixel (x, y, Color. fromArgb (random. next ();} // draw the border line g of the image. drawRectangle (new Pen (Color. silver), 0, 0, image. width-1, image. height-1); // Save the image data. MemoryStream = new MemoryStream (); image. save (stream, ImageFormat. jpeg); // return stream of the output image stream. toArray ();} finally {g. dispose (); image. dispose ();}}}}View Code
The following is the background instance code using the verification code class (generate a 5-Digit Image verification code ):
Using System; using System. collections. generic; using System. linq; using System. web; using System. web. mvc; using System. web. security; using Forcheng. code; namespace Test. controllers {public class HomeController: controller {// <summary> /// obtain the image Verification Code /// </summary> /// <returns> </returns> public ActionResult GetValidateCode (string codeClass) {ValidateCode vCode = new ValidateCode (); string code = vCode. createValidateCode (5); byte [] bytes = vCode. createValidateGraphic (code); return File (bytes, @ "image/jpeg ");}}}View Code
The following is the instance code used on the front-end page:
<! DOCTYPE html> Effect (another password retrieval page, not the front-end code above ):
This is where we will continue.
<My blog homepage>: http://www.cnblogs.com/forcheng/
