asp.net登录界面制作实例

上善若水

类库代码如下：

1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Data.SqlClient;
6. using System.Configuration;
7. using System.Data;
9. /// <summary>
10. ///CommonClass 的摘要说明
11. /// </summary>
12. public class CommonClass
13. {
14. public CommonClass()
15. {
17. }
18. /// <summary>
19. /// 数据库连接类
20. /// </summary>
21. /// <returns>连接对象</returns>
22. public SqlConnection GetConnection()
23. {
24. string myStr = ConfigurationManager.AppSettings["ConnectionString"].ToString();
25. SqlConnection myConn = new SqlConnection(myStr);
26. return myConn;
28. }
29. /// <summary>
30. /// 弹出框
31. /// </summary>
32. /// <param name="TxtMessage">弹出提示信息</param>
33. /// <param name="Url">对话框关闭后，转到地址</param>
34. /// <returns></returns>
35. ///
36. public string MessageBox(string TxtMessage,string Url) {
37. string str;
38. str = "<script language=javascript>alert('"+TxtMessage+"');location='"+Url+"'</script>";
39. return str;
40. }
41. /// <summary>
42. /// 用来执行增删改功能
43. /// </summary>
44. /// <param name="sqlStr"> 操作的SQL语句</param>
45. /// <returns>成功返回true，失败返回FALSE</returns>
46. ///
47. public Boolean ExecSQL(string sqlStr) {
48. SqlConnection myConn = GetConnection();
49. myConn.Open();
51. SqlCommand myCmd = new SqlCommand(sqlStr,myConn);
52. try
53. {
54. myCmd.ExecuteNonQuery();
55. myConn.Close();
57. }
58. catch {
59. myConn.Close();
60. return false;
61. }
62. return true;
64. }
65. /// <summary>
66. /// 返回数据源的数据集
67. /// </summary>
68. /// <param name="sqlStr">操作SQL语句</param>
69. /// <param name="TableName">数据表名称</param>
70. /// <returns>数据集DataSet</returns>
71. public DataSet GetDataSet(string sqlStr, string TableName) {
72. SqlConnection myConn = GetConnection();
73. myConn.Open();
74. SqlDataAdapter adapt = new SqlDataAdapter(sqlStr, myConn);
75. DataSet ds = new DataSet();
76. adapt.Fill(ds, TableName);
77. myConn.Close();
78. return ds;
79. }
80. /// <summary>
81. /// 验证登录，防止SQL注入式攻击
82. /// </summary>
83. /// <param name="loginName">用户名</param>
84. /// <param name="loginPwd">密码</param>
85. /// <returns></returns>
86. public int checkLogin(string loginName,string loginPwd) {
87. SqlConnection myConn = GetConnection();
88. SqlCommand myCmd = new SqlCommand( "select count(*) from tb_User where Name=@loginName and PassWord=@loginPwd",myConn);
89. myCmd.Parameters.Add(new SqlParameter("@loginName",SqlDbType.VarChar,20));
90. myCmd.Parameters["@loginName"].Value = loginName;
91. myCmd.Parameters.Add(new SqlParameter("@loginPwd", SqlDbType.VarChar, 50));
92. myCmd.Parameters["@loginPwd"].Value = loginPwd;
93. myConn.Open();
94. int i = (int)myCmd.ExecuteScalar();
95. myCmd.Dispose();
96. myConn.Close();
97. return i;
99. }
100. /// <summary>
101. /// 实现随机验证码
102. /// </summary>
103. /// <param name="n">验证码个数</param>
104. /// <returns>返回生成的随机数</returns>
105. public string RandomNum(int n) {
106. string strchar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
107. string[] VcArray = strchar.Split(',');
108. string VNum = "";
109. int temp = -1;
110. Random rand=new Random();
111. for (int i=1; i < n + 1; i++) {
112. if (temp != -1) {
113. rand = new Random(i*temp*unchecked((int)DateTime.Now.Ticks));
114. }
115. int t = rand.Next(61);
116. if (temp != -1 && temp == t) {
117. return RandomNum(n);
119. }
120. temp = t;
121. VNum += VcArray[t];
122. }
123. return VNum;
126. }
127. }

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.aspx代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %>







   
   


   

   

       
           
            管理员姓名：
           
           
           
             管理员密码：
           
           
           
             验证码：
           
           
                abel ID="lab_Code" runat="server" Text="8888">abel>
           
            
               
        
           
       
                      οnclick="btn_login_Click1" />
             
                              οnclick="btn_cancel_Click1" />
   

   

.aspx.cs代码如下：

1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Web.UI;
6. using System.Web.UI.WebControls;
8. public partial class Login : System.Web.UI.Page
9. {
10. CommonClass cc = new CommonClass();
11. protected void Page_Load(object sender, EventArgs e)
12. {
13. if (!IsPostBack) {
14. this.lab_Code.Text = cc.RandomNum(4);
16. }
17. }
20. protected void btn_login_Click1(object sender, EventArgs e)
21. {
22. if (txt_name.Text.Trim() == "" || txt_pwd.Text.Trim() == "")
23. {
24. Response.Write(cc.MessageBox("登录名和密码不能为空！", "Login.aspx"));
25. }
26. else
27. {
28. if (txt_code.Text.Trim() == lab_Code.Text.Trim())
29. {
30. int IntUserIn = cc.checkLogin(txt_name.Text.Trim(), txt_pwd.Text.Trim());
31. if (IntUserIn > 0)
32. {
33. Response.Write("<script language=javascript> window.open('AdminIndex.aspx');window.close();</script>");
34. }
35. else
36. {
37. Response.Write(cc.MessageBox("登录名或密码错误！", "Login.aspx"));
39. }
41. }
42. else
43. {
44. Response.Write(cc.MessageBox("验证码错误！", "Login.aspx"));
45. }
47. }
48. }
49. protected void btn_cancel_Click1(object sender, EventArgs e)
50. {
51. Response.Write("<script>window.close();location='javascript:history.go(-1)';</script>");
52. }
53. }

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测试效果如下：

来源：https://blog.csdn.net/yayun0516/article/details/41913059
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