Web登陆功能实现

Request对象: 客户端向服务器发送请求时,服务器对本次请求创建request对象,并在调用Servlet的service方法时,将该对象传递给service方法,Request对象中封装了客户端发来的所有请求数据 —

登陆功能各层实现

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1.UserDao

private QueryRunner qr= new TxQueryRunner();
public User findByLoginnameAndLoginpass(String loginname, String loginpass)throw SQLException{
    String sql = "select * from t_user where loginname=?and loginpass = ?";
    return qr.query(sql,new BeanHandler<User.class>,loginname,loginpass);
}

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2.UserService

private UserDao userDao = new UserDao();
public User login(User user){
    return userDao.findByLoginnameAndLoginpass(user.getLoginname(),user.getLoginpass());
}

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3.UserServlet ``` public String login(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{

1.封装表单数据
User formuser = CommonUtils.toBean(req.getParameterMap(),User.class);
2.校验
Map<String,String> errors = validateLogin(formuser,req.getSession());
if(errors.size()>0){
    req.setAttribute("form",formUser);
    req.setAttribute("errors",errors);
    return "f:/jsps/user/login.jsp";
}
3.调用userService#login()方法
User user = userService.login(formuser);
4.开始判断
if(user == null){
    req.setAttribute("msg","用户名或者密码错误!");
    req.setAttribute("user",formUser);
    return "f:/jsps/user/login.jsp";
}else{
    if(user.isStatus){
        req.setAttribute("msg","你没激活!");
        req.setAttribute("user",formUser);
        return "f:/jsps/user/login.jsp";            
    }else{
        //保存用户到session
        req.getSession.setAttribute("sessionUser",user);
        //获取用户名到cookie中
        String loginname=user.getLoginname();
        loginname = URLEncoder.encode(loginname,"utf-8");
        Cookie cookie = new Cookie("loginname",loginname);
        cookie.setMaxAge(60*60*24*10);//十天
        resp.addCookie(cookie);
        return "r:/index.jsp";
    }
}

}