如何做验证码

1.在servlet中创建BufferedImage创建验证码图片对象，参数宽高声明到外面。

int width = 100;

int weight = 50;

BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INTRGB);

2.美化图片

3，图片对象输出到页面

ImageIO.write(image,"jpg",response.getOutputStream( ));