使用工具类实现验证码
public class CodeImg extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 禁止浏览器使用缓存
response.setHeader("pragam", "no-cache");
response.setHeader("cache-control", "no-cache");
response.setDateHeader("expires",0);
ValidateCode vc = new ValidateCode(110, 25, 4, 9);
vc.write(response.getOutputStream());
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
