学习学习JSP技术实现验证码
<%@ page contentType="image/jpeg" import="java.awt.image.*,java.util.*,java.awt.*,javax.imageio.*"%>
<%!
Color getRandColor(int fc,int bc){
Random random=new Random();
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);
}
%>
<%
response.setHeader("Progma","no-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires",0);
int i_width=60;
int i_height=20;
BufferedImage image=new BufferedImage(i_width,i_height,BufferedImage.TYPE_INT_RGB);
Graphics g=image.getGraphics();
Random random=new Random();
g.setColor(getRandColor(200,250));
g.fillRect(0,0,i_width,i_height);
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
g.setColor(getRandColor(160,200));
for(int i=0;i<155;i++){
int i_x=random.nextInt(i_width);
int i_y=random.nextInt(i_height);
int i_x1=random.nextInt(12);
int i_y1=random.nextInt(12);
g.drawLine(i_x,i_y,i_x+i_x1,i_y+i_y1);
}
String s_Rand="";
for(int i=0;i<4;i++){
String rand=String.valueOf(random.nextInt(10));
s_Rand+=rand;
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
g.drawString(rand,13*i+6,16);
}
session.setAttribute("rand",s_Rand);
g.dispose();
ImageIO.write(image,"JPEG",response.getOutputStream());
%>
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