JavaWeb商城项目（Day04）Web层（注册页面的Servlet）

注册的Servlet程序

public class RegistServlet extends HttpServlet {
    // 因为web层只能调用服务层 不能直接调用持久层
    private UserService userService = new UserServiceImpl();
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        /*
        1.获取请求的参数
        2.检查验证码是否可用
            正确
                3.检查用户名是否可用
                    不可用
                            跳回注册页面
                    可用
                        4.调用Service层保存到数据库
                            跳转到注册成功页面regist_success.html

            不正确
                 跳回注册页面
         */
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String repwd = req.getParameter("repwd");
        String email = req.getParameter("email");
        String code = req.getParameter("code"); // 由服务器生成验证码
        if ("bnbnp".equalsIgnoreCase(code)) {
            if (userService.existsUsername(username)) {
                System.out.println("用户名不可用"+username);
                req.getRequestDispatcher("/pages/user/regist.html").forward(req,resp);
            }else {
                System.out.println("用户名可用"+username);
                userService.registUser(new User(null,username,password,email));
                req.getRequestDispatcher("/pages/user/regist_success.html").forward(req,resp);
            }
        }else {
            System.out.println("验证码错误:"+code);
            req.getRequestDispatcher("/pages/user/regist.html").forward(req,resp);
        }
    }
}

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