用JSP实现的验证码

 
//在图片背景上增加噪点
g.setColor(getRandColor(random, 160, 200));
g.setFont(new Font("Times New Roman", Font.PLAIN, 14));
for (int i = 0; i < 6; i ) {
g.drawString("*********************************************", 0, 5 * (i 2));
}
//取随机产生的认证码(6个汉字)
//保存生成的汉字字符串
String sRand = "";
for (int i = 0; i < 6; i ) {
int start = random.nextInt(length);
String rand = base.substring(start, start 1);
sRand = rand;
//设置字体的颜色
g.setColor(getRandColor(random, 10, 150));
//设置字体
g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)], Font.BOLD, 18 random.nextInt(6)));
//将此汉字画到图片上
g.drawString(rand, 24 * i 10 random.nextInt(8), 24);
}
//将认证码存入session
session.setAttribute("rand", sRand);
g.dispose();
//输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
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