生成验证码的servlet
public class ImgServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public static final int WIDTH = 120;
public static final int HEIGHT = 25;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BufferedImage image = new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
//1、设置背景色
setBackGroud(g);
//2.设置边......
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