请问一下老师，我按照视频完成注册的代码时注册失败，这个会那里代码出了问题呀，麻烦老师帮忙解决一下。谢谢

try {

//获取前台传递的注册函数

Map<String, String[]> map = request.getParameterMap();

User user = new User();

BeanUtils.populate(user, map);

//创建service对象

UserService us = new UserServiceImpl();

us.registerUser(user);

//注册成功

request.getRequestDispatcher("/login.jsp").forward(request, response);

} catch (Exception e) {

// 注册失败

request.getRequestDispatcher("/registerFail.jsp").forward(request, response);

}