效果：
描述：
本事例是为解决在上传或下载文件时避免将路径暴露在外。在上传时将路径进行加密保存到DataTable或数据库中，在下载是再读取DataTable中加密数据进行解密下载。
代码:
【前台代码】
1 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="FileUpload.aspx.cs" Inherits="FilePathEncrypt.FileUpload" %> 2 3 <!DOCTYPE html> 4 5 <html xmlns="http://www.w3.org/1999/xhtml"> 6 <head runat="server"> 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 8 <title></title> 9 10 </head>11 <body>12 <%--<form id="form1" runat="server" name="formFile" method="post" action="/FileUpload.aspx" target="frameFile" enctype="multipart/form-data">--%>13 <form id="form1" runat="server">14 <div>15 <%--<input type="text" id="textID" name="txtName" />--%>16 <%--<input type="file" id="fileUp" name="fileUp" />--%> <%--<input type="submit" value="确认上传" />--%>17 <%--<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>--%>18 <asp:FileUpload ID="FileUpload1" runat="server" /> <asp:Button ID="Button1" runat="server" Text="确认上传" OnClick="Button1_Click" />19 20 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Height="132px" Width="251px" CellPadding="4" ForeColor="#333333" GridLines="None">21 <AlternatingRowStyle BackColor="White" />22 <Columns>23 <asp:BoundField DataField="ID" HeaderText="ID" />24 <asp:BoundField DataField="FileName" HeaderText="名称" />25 <asp:BoundField DataField="FileType" HeaderText="类型" />26 <asp:BoundField DataField="FilePath_Security" HeaderText="路径加密" />27 <asp:TemplateField HeaderText="下载">28 <ItemTemplate>29 <asp:HyperLink ID="HyperLink1" NavigateUrl='<%# Eval("FilePath_Security") %>' runat="server">下载</asp:HyperLink>30 </ItemTemplate>31 </asp:TemplateField>32 </Columns>33 <EditRowStyle BackColor="#2461BF" />34 <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />35 <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />36 <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />37 <RowStyle BackColor="#EFF3FB" />38 <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />39 <SortedAscendingCellStyle BackColor="#F5F7FB" />40 <SortedAscendingHeaderStyle BackColor="#6D95E1" />41 <SortedDescendingCellStyle BackColor="#E9EBEF" />42 <SortedDescendingHeaderStyle BackColor="#4870BE" />43 </asp:GridView>44 </div>45 </form>46 <iframe id="frameFile" name="frameFile" style="display: none;"></iframe>47 </body>48 </html>
【后台代码】
1 using System; 2 using System.Collections.Generic; 3 using System.Data; 4 using System.IO; 5 using System.Linq; 6 using System.Web; 7 using System.Web.UI; 8 using System.Web.UI.WebControls; 9 using WooBase.Common; 10 11 namespace FilePathEncrypt 12 { 13 public partial class FileUpload : System.Web.UI.Page 14 { 15 PRotected void Page_Load(object sender, EventArgs e) 16 { 17 18 DataTable dt = new DataTable(); 19 dt = NewTable(); 20 21 GridView1.DataSource = dt; 22 GridView1.DataBind(); 23 } 24 25 /// <summary> 26 /// 构建DataTable 27 /// </summary> 28 /// <returns></returns> 29 public DataTable NewTable() 30 { 31 DataTable dt = new DataTable(); 32 dt.TableName = "SaveData"; 33 DataColumn col = new DataColumn("ID", typeof(Int32)); 34 col.AutoIncrement = true; 35 col.AutoIncrementSeed = 1; 36 col.AutoIncrementStep = 1; 37 dt.Columns.Add(col); 38 dt.Columns.Add("FileName", typeof(String)); 39 dt.Columns.Add("FileType", typeof(String)); 40 dt.Columns.Add("FilePath_Security", typeof(String)); 41 42 DataRow dr = dt.NewRow(); 43 dr["FileName"] = "青苹果.jpg"; 44 dr["FileType"] = ".jpg"; 45 dr["FilePath_Security"] = "DownLoad.aspx?cmd=6A6B41446F6E395177457A70705541344D563657736B5351417447445441485A633348326E55347A2F5854656751764C4E4A546172773D3D"; 46 dt.Rows.Add(dr); 47 DataRow dr1 = dt.NewRow(); 48 dr1["FileName"] = "青苹果.txt"; 49 dr1["FileType"] = ".txt"; 50 dr1["FilePath_Security"] = "DownLoad.aspx?cmd=6A6B41446F6E395177457A70705541344D563657736B5351417447445441485A633348326E55347A2F5854656751764C4E4A546172773D3D"; 51 dt.Rows.Add(dr1); 52 53 return dt; 54 } 55 56 protected void Button1_Click(object sender, EventArgs e) 57 { 58 string FullName = FileUpload1.PostedFile.FileName; 59 if (!string.IsNullOrEmpty(FullName)) 60 { 61 FileInfo fi = new FileInfo(FullName); 62 string name = fi.Name;//获取Word名称 63 string type = fi.Extension;//获取word类型 64 string SavePath = Server.MapPath("UploadFile//");//word保存到文件夹下 65 if (!Directory.Exists(SavePath)) //判断文件夹是否存在，如果不存在则创建 66 { 67 Directory.CreateDirectory(SavePath); 68 } 69 this.FileUpload1.PostedFile.SaveAs(SavePath + "//" + name + ".wdata");//保存路径 70 string SecurityPath = setPath("UploadFile//" + name + ".wdata");//加密 71 72 DataTable dt = new DataTable(); 73 dt = NewTable(); 74 if (name != "") 75 { 76 DataRow dr = dt.NewRow(); 77 dr["FileName"] = name; 78 dr["FileType"] = type; 79 dr["FilePath_Security"] = SecurityPath; 80 dt.Rows.Add(dr); 81 } 82 GridView1.DataSource = dt; 83 GridView1.DataBind(); 84 } 85 else 86 { 87 Response.Write("<script>alert('请选择文件');</script>"); 88 } 89 } 90 /// <summary> 91 /// 加密路径 92 /// </summary> 93 /// <param name="path"></param> 94 /// <returns></returns> 95 public static string setPath(string path) 96 { 97 string SetPath = ""; 98 try 99 {100 SetPath = "DownLoad.aspx?cmd=" + Security.Encrypt_Des2(path) + "/"";101 return SetPath;102 }103 catch (Exception ex)104 {105 throw ex;106 }107 108 }109 }110 }【后台加密函数代码】
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.IO; 6 using System.Text; 7 using System.Security.Cryptography; 8 9 namespace WooBase.Common10 {11 public class Security12 {13 // DES 的加密方法 。 14 // 私钥加密 / 对称算法 。 15 public static string Encrypt_Des(string cleanString)16 {17 //.NET 框架提供的对称加密类需要一个密钥和一个新的 IV 来加
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