注册功能:保存用户信息到数据库
验证码功能:
展示验证码:展示验证码图片,并可以点击切换
校验验证码:验证码填写不正确,则注册失败
注册案例 -- 校验验证码
判断程序生成的验证码 和 用户输入的验证码 是否一样,如果不一样,则阻止注册
验证码图片访问和提交注册表单是两次请求,所以要将程序生成的验证码存入Session中
验证码存入session
@Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 生成验证码 ServletOutputStream os = response.getOutputStream(); String checkCode = CheckCodeUtil.outputVerifyImage(100, 50, os, 4); // 存入Session HttpSession session = request.getSession(); session.setAttribute("checkCodeGen",checkCode); }
保存表单获取session
@Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 获取用户名和密码数据 String username = request.getParameter("username"); String password = request.getParameter("password"); User user = new User(); user.setUsername(username); user.setPassword(password); // 获取用户输入的验证码 String checkCode = request.getParameter("checkCode"); // 程序生成的验证码,从Session获取 HttpSession session = request.getSession(); String checkCodeGen = (String) session.getAttribute("checkCodeGen"); // 比对 if(!checkCodeGen.equalsIgnoreCase(checkCode)){ request.setAttribute("register_msg","验证码错误"); request.getRequestDispatcher("/register.jsp").forward(request,response); // 不允许注册 return; }
标签:String,checkCode,request,验证码,案例,session,注册 From: https://www.cnblogs.com/popopopopo/p/17081745.html