产生随机图片验证的jsp代码

来源：互联网发布：人工智能会议 2016 编辑：程序博客网时间：2024/05/01 17:54

//下面的代码放在jsp服务器上就可以产生随机数字图片验证代码

<%@ page contentType="image/jpeg; charset=gb2312" language="java" %>
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,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("Pragma","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());
%>