//获取用户输入的用户名和密码
String username = req.getParameter("username");
String password = req.getParameter("password");
UserDao dao = new UserDaoJdbcImpl();
User user = dao.findUserByUsernameAndPassword(username, password);
//设置响应头信息
resp.setContentType("text/html;charset=utf-8");
//获取输出流
PrintWriter out = resp.getWriter();
if(user == null ) {
//登录失败
out.println("登录失败!!!!");
}else {
//登录成功
out.println("登录成功!!!!");
}
out.close();