最简单三层登陆入门源码-问答列表|—51aspx.com

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louji***（用户）发表于：2009-06-12 14:15:00

能否vb语言版的。

1 个回复
- study***（用户）回复于：2009-06-13 11:42:00
  
  C#版.
ttkl6***（作者）发表于：2008-07-21 16:26:00

嘿嘿最简单三层！想要不？ asp.net + C# +access 工具：vs 2005 名称：登陆三层 首先新建一个项目选择解决方案-空白方案 其次添加一个项目选择类库取名 MOD  数据模型层 再添加一个项目   选择类库取名 DAL  数据访问层 再添加个项目取名  选择类库取名 BLL 业务逻辑层 最后添加一个web应用程序 然后右击DAL 选着依赖 MOD  还有添加引用选project 选择 MOD 右键 BLL   选择依赖MOD DAL 添加引用 MOD DAL 最后web 引用 BLL 这样我们就搭建好了环境然后开始编码 新建数据库:User          UserName  Pwd 如果有问题请联系 谢谢！ 首先是：MOD<div class="blockcode"><div id="code_-1"><ol><li> </li> <li>using System; </li> <li>using System.Collections.Generic; </li> <li>using System.Text; </li> <li>namespace MOD </li> <li>{ </li> <li>    public class User </li> <li>    { </li> <li>        private int id; </li> <li>       // private int uid; </li> <li>        private string uname = string.Empty; </li> <li>        private string upwd = string.Empty; </li> <li>        public int UID </li> <li>        { </li> <li>            get </li> <li>            { </li> <li>                return this.id; </li> <li>            } </li> <li>            set </li> <li>            { </li> <li>                this.id = value; </li> <li>            } </li> <li>        } </li> <li>        public string UserName </li> <li>        { </li> <li>            get </li> <li>            { </li> <li>                return this.uname; </li> <li>            } </li> <li>            set </li> <li>            { </li> <li>                this.uname = value; </li> <li>            } </li> <li>        } </li> <li>        public string Pwd </li> <li>        { </li> <li>            get </li> <li>            { </li> <li>                return this.upwd; </li> <li>            } </li> <li>            set </li> <li>            { </li> <li>                this.upwd = value; </li> <li>            } </li> <li>        } </li> <li>    } </li> <li>} </li> </ol></div>复制代码</div>看到了吧主要是一个姓名和密码的模型 然后是DAL 可以添加一个类取名：DBHelp<div class="blockcode"><div id="code_0"><ol><li>using System; </li> <li>using System.Collections.Generic; </li> <li>using System.Text; </li> <li>using System.Data.OleDb; </li> <li>using System.Configuration; </li> <li>using System.Web; </li> <li>namespace DAL </li> <li>{ </li> <li>   public class DBHelp </li> <li>    { </li> <li>        private static OleDbConnection conn; </li> <li>        public static OleDbConnection Conn </li> <li>        { </li> <li>            get </li> <li>            { </li> <li>                string connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Inetpub\\wwwroot\\Simple\\Login\\Web\\App_Data\\User.mdb"; </li> <li>                if (conn == null) </li> <li>                { </li> <li>                    conn = new OleDbConnection(connstr); </li> <li>                    conn.Open(); </li> <li>                } </li> <li>                else if (conn.State == System.Data.ConnectionState.Closed) </li> <li>                { </li> <li>                    conn.Open(); </li> <li>                } </li> <li>                else if(conn.State == System.Data.ConnectionState.Broken) </li> <li>                { </li> <li>                    conn.Close(); </li> <li>                    conn.Open(); </li> <li>                } </li> <li>                return conn; </li> <li>            } </li> <li>        } </li> <li>        public static int ExecuteCommand(string sql, params OleDbParameter[] values) </li> <li>        { </li> <li>            OleDbCommand cmd = new OleDbCommand(sql, Conn); </li> <li>            cmd.Parameters.AddRange(values); </li> <li>            return cmd.ExecuteNonQuery(); </li> <li>        } </li> <li>        public static OleDbDataReader GetReader(string sql,params OleDbParameter[] values) </li> <li>        { </li> <li>            OleDbCommand cmd = new OleDbCommand(sql,Conn); </li> <li>            cmd.Parameters.AddRange(values); </li> <li>            OleDbDataReader reader = cmd.ExecuteReader(); </li> <li>            return reader; </li> <li>        } </li> <li>        } </li> <li>    } </li> </ol></div>复制代码</div>然后是UserService类里面<div class="blockcode"><div id="code_1"><ol><li>using System; </li> <li>using System.Collections.Generic; </li> <li>using System.Text; </li> <li>using MOD; </li> <li>using System.Data.OleDb; </li> <li>namespace DAL </li> <li>{ </li> <li>    public class UserService </li> <li>    { </li> <li>        public static User Login(string loginname) </li> <li>        { </li> <li>            string sql = "select * from [Login] where [UserName] = @loginname"; </li> <li>            using(OleDbDataReader reader = DBHelp.GetReader(sql,new OleDbParameter("@loginname",loginname))) </li> <li>            { </li> <li>                if(reader.Read()) </li> <li>                { </li> <li>                   User user= new User(); </li> <li>                   user.UserName = (string)reader["UserName"]; </li> <li>                   user.Pwd=(string)reader["Pwd"]; </li> <li>                    return user; </li> <li>                } </li> <li>                else </li> <li>                { </li> <li>                    reader.Close(); </li> <li>                    return null; </li> <li>                } </li> <li>            } </li> <li>        } </li> <li>    } </li> <li>} </li> </ol></div>复制代码</div>最后是BLL<div class="blockcode"><div id="code_2"><ol><li> </li> <li>UserManage </li> <li>using System; </li> <li>using System.Collections.Generic; </li> <li>using System.Text; </li> <li>using MOD; </li> <li>using DAL; </li> <li>namespace BLL </li> <li>{ </li> <li>    public class UserMangage </li> <li>    { </li> <li>        public static bool login(string loginname, string pwd) </li> <li>        { </li> <li>            User user = UserService.Login(loginname); </li> <li>            if (user.Pwd == pwd) </li> <li>            { </li> <li>                return true; </li> <li>            } </li> <li>            else </li> <li>            { </li> <li>                return false; </li> <li>            } </li> <li>        } </li> <li>    } </li> <li>} </li> </ol></div>复制代码</div>最后index中<div class="blockcode"><div id="code_3"><ol><li> </li> <li>using System; </li> <li>using System.Data; </li> <li>using System.Configuration; </li> <li>using System.Web; </li> <li>using System.Web.Security; </li> <li>using System.Web.UI; </li> <li>using System.Web.UI.WebControls; </li> <li>using System.Web.UI.WebControls.WebParts; </li> <li>using System.Web.UI.HtmlControls; </li> <li> </li> <li>public partial class _Default : System.Web.UI.Page </li> <li>{ </li> <li>    protected void Page_Load(object sender, EventArgs e) </li> <li>    { </li> <li>        if (!this.IsPostBack) </li> <li>        { </li> <li>        } </li> <li>    } </li> <li>    protected void btnLogin_Click(object sender, EventArgs e) </li> <li>    { </li> <li>        bool s = BLL.UserMangage.login(this.txtName.Text, this.txtPwd.Text); </li> <li>        if(s==true) </li> <li>        { </li> <li>            Response.Redirect("Main.aspx"); </li> <li>        } </li> <li>        else </li> <li>        { </li> <li>            Response.Write("登陆失败"); </li> <li>        } </li> <li>    } </li> <li>} </li> </ol></div>复制代码</div>源码下载地址：<a href="http://www.51aspx.com/CV/SimpleThreeLayer" target="_blank">http://www.51aspx.com/CV/SimpleThreeLayer</a> 

4 个回复
- ymshm***（用户）回复于：2008-10-07 19:03:00
 
 UserManage using System; 177<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />using System.Collections.Generic; 178<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />using System.Text; 179<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />using MOD; 180<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />using DAL; 181<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />namespace BLL 182<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />{ 183<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />    public class UserMangage 184<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />    { 185<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />        public static bool login(string loginname, string pwd) 186<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />        { 187<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />            User user = UserService.Login(loginname);             if (user != null)             { 188<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />            if (user.Pwd == pwd) 189<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />            { 190<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />                return true; 191<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />            } 192<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />            else 193<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />            { 194<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />                return false; 195<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />            }             }             else             {                 return false;             } 196<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />        } 197<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />    } 198<img src="http://www.51aspx.com/images/OutliningIndicators/None.gif" border="0" onload="thumbImg(this)" />} 
- sutia***（用户）回复于：2008-10-29 16:49:00
 
 应该是依赖该空间后，工具会自动加 using  空间名；
- 神风怪盗***（用户）回复于：2008-10-01 09:41:00
 
 我想说一下的是。。你们有没有测试过的。。汗死。。这个登陆系统有BUG。。。 当输入不正确的用户名时，会报错。。页面会没反应。。 问题原因是：UserService.cs 这文件里面的代码。                   if(reader.Read())                 {                    user.UserName = (string)reader["UserName"];                    user.Pwd=(string)reader["Pwd"];                    return user;                 }                 else                 {                     user.Pwd = "oooo";//这里是我给Pwd加的值。不知道有没有BUG！                     reader.Close();                     return user ;//关键这里!当程序执行到这里，原代码是返回NULL的。我这里改成返回对象了！成功！                 }
- piaol***（用户）回复于：2008-10-28 16:09:00
 
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