Java Create picture Verification code

Package com;

Import Java.awt.BasicStroke;
Import Java.awt.Color;
Import Java.awt.Font;
Import Java.awt.Graphics2D;
Import Java.awt.image.BufferedImage;
Import java.io.IOException;
Import Java.util.Random;

Import Javax.imageio.ImageIO;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
Import javax.servlet.http.HttpSession;

public class Imgservlet extends HttpServlet {

/**
*
*/
Private static final long serialversionuid = 1L;

 private static Random random = new random ();
 private color getrandcolor (int fc, int BC) {//a given range get random color
     if (FC > 255)
         fc=255;
     if (BC > 255)
         bc=255;
     int R=FC + random.nextint (BC-FC);
     int G=FC + random.nextint (BC-FC);
     int B=FC + random.nextint (BC-FC);
     return new Color (R, G, b);
 }

public void Goregister (HttpServletRequest request, httpservletresponse response) {
Settings page does not cache
Response.setheader ("Pragma", "No-cache");
Response.setheader ("Cache-control", "No-cache");
Response.setdateheader ("Expires", 0);

Create an image in memory
int width=100, height=40; Image size
BufferedImage image=new bufferedimage (width, height, bufferedimage.type_int_rgb);
Get the graphics context
Graphics2D G=image.creategraphics ();
G.setcolor (New Color (255, 255, 255)); Set Background color
G.fillrect (0, 0, width, height);
G.setfont (New Font ("Times New Roman", Font.Bold, 30)); Set font
Color C = Getrandcolor (160, 200);
Randomly generates 155 lines of interference so that the authentication code in the image is not easily detected by other programs
G.setcolor (c);
for (int i=0; i < 155; i++) {
int X=random.nextint (width);
int y=random.nextint (height);
int Xl=random.nextint (12);
int Yl=random.nextint (12);
G.drawline (x, y, X + xl, y + yl);
}
Add a noise point
float yawprate = 0.05f;//noise Rate
int area = (int) (yawprate * width * height);
for (int i = 0; i < area; i++) {
int x = random.nextint (width);
int y = random.nextint (height);
int RGB = Getrandomintcolor ();
Image.setrgb (x, y, RGB);
}
Randomly generate different fonts, font styles, and font sizes
String[] FontName = {"Microsoft Jas Black", "blackbody", "Georgia", "Verdana", "Arial", "Comic Sans MS", "Lucida Console"};
int [] FontEffect = {font.plain, font.italic, font.bold};
int [] FontSize = {28, 30, 32, 26};
font[] fonts = new Font[fontname.length*fonteffect.length*fontsize.length];
int fontsindex=0;
for (String str:fontname) {
for (int effect:fonteffect) {
for (int size:fontsize) {
Font font = new Font (str, effect, size);
Fonts[fontsindex]=font;
Fontsindex = Fontsindex +1;
}
}
}
String s= "abcdefghijknpqrstuvxyzABCDEFGHJKLNPQRSTUVXYZ23456789"; Set up an alternate verification code
String srand= "";
Draws the verification code into the image with a randomly generated color.
int length = 4; Set a default build of 4 verification codes
for (int i=0;i<length;i++) {
G.setcolor (New Color (20+random.nextint, 20+random.nextint), 20+random.nextint (110)); Generate a random color (because it's a foreground, so deep)
G.setfont (Fonts[random.nextint (fonts.length)); Random font at the top of the call
String ch=string.valueof (S.charat (Random.nextint (S.length ())));

Set Font rotation
int Zhuan = Random.nextint (20);
int Fzhuan =-random.nextint (20);
G.rotate (Math.toradians (Zhuan), 25* (i-1), 20); coordinate system clockwise rotation
G.rotate (Math.toradians (Fzhuan), 25* (i-1), 20); Coordinate system counterclockwise turn

Srand+=ch;
g.DrawString (CH, * i + 15, 30); Display the authentication code in the image with the drawstring function

G.rotate (Math.toradians ( -1*zhuan), 25* (i-1), 20);
G.rotate (Math.toradians ( -1*fzhuan), 25* (i-1), 20);
}
Draw an irregular line on the upper end of the authentication code
int visit[] = new INT[6];
for (int i = 0; i < visit.length; i++) {
Visit[i] = 1 + (int) (Math.random () * 10);
}
G.setcolor (Color.Black);
int drawhigh[] = new INT[6];
int drawwidth[] = new INT[6];
Vertex coordinates
for (int i = 0; i < 6; i++) {
Drawhigh[i] =-(int) (Math.ceil (visit[i] * 3.8));
Drawwidth[i] = 5 + i * 17;
}
G.setstroke (New Basicstroke (3.0f)); polyline thickness
G.setpaint (Color.gray);//The Color of the polyline
G.drawpolyline (DrawWidth, Drawhigh, 6); Draw a polyline
Save authentication Code to session
HttpSession session = Request.getsession (true);
String time=string.valueof (System.currenttimemillis ());
String Value=time + "_" + SRand;
Session.setattribute ("", time);
Session.setattribute ("", value);

Image effective
G.dispose ();
try {
Imageio.write (Image, "JPEG", Response.getoutputstream ()); Output image to Page
} catch (IOException e) {
E.printstacktrace ();
}
}
private static int Getrandomintcolor () {
int[] RGB = Getrandomrgb ();
int color = 0;
for (int c:rgb) {
color = Color << 8;
color = Color | C
}
return color;
}
private static int[] Getrandomrgb () {
int[] RGB = new INT[3];
Random random = new random ();
for (int i = 0; i < 3; i++) {
Rgb[i] = random.nextint (255);
}
return RGB;
}
}

Java Create picture Verification code