关于jsp生成验证码图片的问题
我准备写个jsp生成验证码的例子,在网上找了个:
hehe.jsp
<%@ page contentType= "text/html;charset=GBK "
import= "java.awt.*,java.awt.image.*,java.util.*,javax.imageio.* "
pageEncoding= "GBK "%>
<html>
<body>
<%!Color getRandColor(int fc, int bc) {//给定范围获得随机颜色
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);
}%> <%
//设置页面不缓存
response.setHeader( "Pragma ", "No-cache ");
response.setHeader( "Cache-Control ", "no-cache ");
response.setDateHeader( "Expires ", 0);
// 在内存中创建图象
int width = 60, height = 20;
BufferedImage image