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@Controller @RequestMapping("/PictureCheckCode") public class ServletController { @RequestMapping public void pictureGenerate( HttpServletRequest req, HttpServletResponse res ) { try { MakePicture mp=new MakePicture() ; String str=mp.drawPicture(60, 20,res.getOutputStream() ); req.getSession().setAttribute("pic", str); res.getOutputStream().print(str); } catch(Exception ex) { ex.printStackTrace(); } } }
<form th:action="@{/login}" method="post"> <div><label> User Name : <input type="text" name="username"/> </label></div> <div><label> Password: <input type="password" name="password"/> </label></div> <div><label> Verify: <img src="PictureCheckCode" onclick="this.src=‘PictureCheckCode?d=‘+new Date().getTime()"/> </label></div> <div><input type="submit" value="Sign In"/></div> </form>
package hello;
import java.awt.Graphics;
import java.awt.Font;
import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.util.Random;
import java.io.OutputStream;
import java.io.IOException;
public class MakePicture //产生识别验证图像
{
private char charTable[]={
‘a‘,‘A‘,‘b‘,‘B‘,‘c‘,‘C‘,‘d‘,‘D‘ ,‘e‘,‘E‘ ,
‘f‘,‘F‘,‘g‘,‘G‘,‘h‘,‘H‘,‘i‘,‘I‘,‘j‘,‘J‘ ,
‘0‘,‘1‘,‘2‘,‘3‘,‘4‘,‘5‘,‘6‘,‘7‘,‘8‘,‘9‘
};
public String drawPicture(int width,int height,OutputStream os)
{
if(width<=0)
width=100 ;
if(height<=0)
height=60 ;
BufferedImage image=new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB) ;
Graphics g=image.getGraphics() ;
g.setColor(Color.LIGHT_GRAY) ;
g.fillRect(0, 0, width, height) ;
g.setColor(new Color(0x5265fd)) ;
g.drawRect(0, 0, width, height) ;
String str ="" ;
for(int x=0;x<4;x++)
{
str+=charTable[(int) (Math.random()*charTable.length)];
}
g.drawString(str.substring(0, 1), 0, 15);
g.drawString(str.substring(1, 2), 15, 17);
g.drawString(str.substring(2, 3), 35, 19);
g.drawString(str.substring(3, 4), 50, 16);
Random rand=new Random() ;
for(int i=0;i<10;i++)
{
int x=rand.nextInt(width) ;
int y=rand.nextInt(height) ;
g.drawOval(x, y, 1, 1) ;
}
g.dispose() ;
try {
ImageIO.write(image, "JPEG",os) ;
} catch (IOException e) {
e.printStackTrace();
return "" ;
}
return str ;
}
}
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原文地址：http://www.cnblogs.com/feika/p/4462474.html
