Generate a picture color verification code (with verification code rotation)

Generate a CAPTCHA picture generally returns the InputStream type, which can be used in any case, and can be dynamically generated by writing the returned value of InputStream to a file

The code is as follows:[Java] View plain copy package com.yxfei.tool;      import java.awt.color;   Import  java.awt.Font;   import java.awt.graphics;   import java.awt.graphics2d;    import java.awt.geom.affinetransform;   import java.awt.image.bufferedimage;    import java.io.bytearrayinputstream;   import java.io.bytearrayoutputstream;    import java.io.inputstream;   import java.util.random;      import javax.imageio.imageio;   import javax.imageio.stream.imageoutputstream;   import javax.servlet.http.httpservletrequest;         public class  verifycode {              static random  r = new random ();       public static Color  GeTrandcolor (Int min, int max)  {                       if  (min > 255)                 min = 255;            if  (max > 255)                 max = 255;            int red = r.nextint (max - min)  + min;            int green = r.nextint (max - min)  + min;            int blue = r.nextint (max -  min)  + min;           return new  Color (Red,  green, blue);       }           Public static inputstream getverifycode (int width,int height,httpservletrequest  Request)  throws Exception {           //  todo auto-generated method stub            bytearrayinputstream inputstream = null;            bufferedimage image = new bufferedimage (width, height,                    bufferedimage.type_int_rgb );           graphics g = image.getgraphics ();            Graphics2D g2d =  (graphics2d)   g;           g.setcolor (Getrandcolor (200, 250));           g.fillrect (0, 0, width, height);           g.setcolor (Getrandcolor (180, 200));            g.drawrect (0, 0, width-1, height-1);           for  (int i = 0; i < 200;  i++)  {               int  X = r.nextint (width - 1);                int y = r.nextint (height - 1);                int x1 = r.nextint (WIDTH&NBSP;-&NBSP;10) + 10;    &Nbsp;          int y1 = r.nextint (height &NBSP;-&NBSP;4) +4;                G.setcolor (Getrandcolor (180, 200));                g.drawline (x,y,x1,y1);           }            for (int i=0;i<300;i++)             {                int x = r.nextint (width);                int y = r.nextint (height);                g.setcolor (Getrandcolor (150,180));                 g.drawrect (x, y, 0, 0);            }           String sRand =  " ",s = " ";           int digital = 0;            int itmp = 0;            for  (int i = 0; i < 4; i+ +)  {               switch  ( R.nextint (4))  {               case  0:               case 1:                    digital  = r.neXtint ( + 65;               )     s = string.valueof ((char)  digital);                    break;                case 2:                    digital = r.nextint (num)  +  97;                    s = string.valueof ((char)  digital);                    break;                default:s = string.valueof (R.nextInt (9));               }                sRand +=s;                font mfont = new font ("Arial",  font.bold| FONT.ITALIC,&NBSP;25);                G.setfont (mfont);               boolean  b = r.nextboolean ();                string a = b? "": "-";                int sin = integer.parseint (a+r.nextint);                g.setcolor (Getrandcolor (20, 130));    &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;    affinetransform tr = new affinetransform ();                tr.rotate (sin*3.14/180, 15*i+6, b?) 5: (0));               g2d.settransform (tr );               g.drawstring (s, 16* i+10, 23);           }            system.out.println (SRand);            request.getsession (True). setattribute ("Verifycode",  srand);            g.dispose ();            bytearrayinputstream input = null;            bytearrayoutputstream Output = new bytearrayoutputstream ();            try {                imageoutputstream imageout = imageio                        .createimageoutputstream (Output) ;               imageio.write (Image,   "JPEG",  imageout);                imageout.close ();                Inputstream = new bytearrayinputstream (Output.tobytearray ());            } catch  (exception e)  {              &NBSP;&NBSP;SYSTEM.OUT.PRINTLN ("Validation code generation failed" + e.tostring ());            }           return inputStream;       }     }