效果：
描述：
本事例是為解決在上傳或下載文件時避免將路徑暴露在外。在上傳時將路徑進行加密保存到DataTable或數據庫中，在下載是再讀取DataTable中加密數據進行解密下載。
代碼:
【前台代碼】
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="確認上傳" />--%>
17 <%--<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>--%>
18 <asp:FileUpload ID="FileUpload1" runat="server" /> <asp:Button ID="Button1" runat="server" Text="確認上傳" 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="名稱" />
25 <asp:BoundField DataField="FileType" HeaderText="類型" />
26 <asp:BoundField DataField="FilePath_Security" HeaderText="路徑加密" />
27 <asp:TemplateField HeaderText="下載">
28 <ItemTemplate>
29 <asp:HyperLink ID="HyperLink1" NavigateUrl='<%# Eval("FilePath_Security") %>' runat="server">下載</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" ></iframe>
47 </body>
48 </html>
【後台代碼】
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 /// 構建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"] = "青蘋果.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"] = "青蘋果.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;//獲取word名稱
63 string type = fi.Extension;//獲取word類型
64 string SavePath = Server.MapPath("UploadFile\\");//word保存到文件夾下
65 if (!Directory.Exists(SavePath)) //判斷文件夾是否存在，如果不存在則創建
66 {
67 Directory.CreateDirectory(SavePath);
68 }
69 this.FileUpload1.PostedFile.SaveAs(SavePath + "\\" + name + ".wdata");//保存路徑
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('請選擇文件');</script>");
88 }
89 }
90 /// <summary>
91 /// 加密路徑
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 }
【後台加密函數代碼】
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.Common
10 {
11 public class Security
12 {
13 // DES 的加密方法 。
14 // 私鑰加密 / 對稱算法 。
15 public static string Encrypt_Des(string cleanString)
16 {
17 //.NET 框架提供的對稱加密類需要一個密鑰和一個新的 IV 來加密和解密數據。
18 //每當使用默認的構造函數創建其中一個托管對稱加密類的新實例時，就會自動創建新的密鑰和 IV
19 //DES 使用 64 位密鑰、64 位塊來加密和解密數據。每個數據塊迭代 16 次以生成加密文本。
20 //初始化向量（IV） 用來第一次對數據塊進行加密 。
21 byte[] KEY_64 = { 42, 16, 93, 156, 78, 14, 218, 31 }; // 指定的 Key
22 byte[] IV_64 = { 55, 103, 246, 79, 36, 23, 167, 0 }; // 初始化向量（IV）
23 DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
24 MemoryStream ms = new MemoryStream();
25 CryptoStream cs = new CryptoStream(ms, provider.CreateEncryptor(KEY_64, IV_64), CryptoStreamMode.Write);
26 StreamWriter sw = new StreamWriter(cs);
27 sw.Write(cleanString);
28 sw.Flush();
29 cs.FlushFinalBlock();
30 ms.Flush();
31 return Convert.ToBase64String(ms.GetBuffer(), 0, int.Parse((ms.Length.ToString())));
32 }
33
34 public static string Encrypt_Des2(string cleanString)
35 {
36 string result = string.Empty;
37 byte[] KEY_64 = { 42, 16, 93, 156, 78, 14, 218, 31 }; // 指定的 Key
38 byte[] IV_64 = { 55, 103, 246, 79, 36, 23, 167, 0 }; // 初始化向量（IV）
39 DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
40 MemoryStream ms = new MemoryStream();
41 CryptoStream cs = new CryptoStream(ms, provider.CreateEncryptor(KEY_64, IV_64), CryptoStreamMode.Write);
42 StreamWriter sw = new StreamWriter(cs);
43 sw.Write(cleanString);
44 sw.Flush();
45 cs.FlushFinalBlock();
46 ms.Flush();
47 string tmpS = Convert.ToBase64String(ms.GetBuffer(), 0, int.Parse((ms.Length.ToString())));
48 byte[] bTemp = System.Text.Encoding.Default.GetBytes(tmpS);
49 for (int i = 0; i < bTemp.Length; i++)
50 {
51 result += bTemp[i].ToString("X");
52 }
53 return result;
54 }
55
56 // DES 的解密方法 。
57 // 私鑰加密 / 對稱算法 。
58 public static string Decrypt_Des(string encryptedString)
59 {
60 byte[] KEY_64 = { 42, 16, 93, 156, 78, 14, 218, 31 };
61 byte[] IV_64 = { 55, 103, 246, 79, 36, 23, 167, 0 };
62 DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
63 byte[] buffer = Convert.FromBase64String(encryptedString);
64 MemoryStream ms = new MemoryStream(buffer);
65 CryptoStream cs = new CryptoStream(ms, provider.CreateDecryptor(KEY_64, IV_64), CryptoStreamMode.Read);
66 StreamReader sr = new StreamReader(cs);
67 return sr.ReadToEnd();
68
69 }
70
71 public static string Decrypt_Des2(string encryptedString)
72 {
73 byte[] b = new byte[encryptedString.Length / 2];
74 for (int i = 0; i < encryptedString.Length / 2; i++)
75 {
76 string strTemp = encryptedString.Substring(i * 2, 2);
77 b[i] = Convert.ToByte(strTemp, 16);
78 }
79 string str = System.Text.Encoding.Default.GetString(b);
80
81 byte[] KEY_64 = { 42, 16, 93, 156, 78, 14, 218, 31 };
82 byte[] IV_64 = { 55, 103, 246, 79, 36, 23, 167, 0 };
83 DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
84 byte[] buffer = Convert.FromBase64String(str);
85 MemoryStream ms = new MemoryStream(buffer);
86 CryptoStream cs = new CryptoStream(ms, provider.CreateDecryptor(KEY_64, IV_64), CryptoStreamMode.Read);
87 StreamReader sr = new StreamReader(cs);
88 return sr.ReadToEnd();
89
90 }
91 }
92 }
【後台下載類代碼】
1 using System;
2 using System.Collections.Generic;
3 using System.IO;
4 using System.Linq;
5 using System.Web;
6 using System.Web.UI;
7 using System.Web.UI.WebControls;
8 using Woo.Utility;
9 using WooBase.Common;
10
11
12 namespace FilePathEncrypt
13 {
14 public partial class DownLoad : System.Web.UI.Page
15 {
16 protected void Page_Load(object sender, EventArgs e)
17 {
18 //訪問此頁進行解密下載
19 //例如：AjaxPage/WooCommon/DownLoad.aspx?cmd=42544F4A692B5775664E4C45316E3437366B2F553761304E6A52644A32734E76697470494C726E4D766C4662795751322B6737375875504D73644331556F4A2F6C2F526C39423073365435492F33714D3755657536484868496B3275395A745059464C72776E705376666B4D7330504F5A30476F454C3061697541784B556471724B30777479577A382F453D
20
21 var cmd = PageUtility.GetRequestString("cmd");
22 if (!string.IsNullOrEmpty(cmd))
23 {
24 cmd = cmd.Replace("\"", "").Trim();
25 cmd = Security.Decrypt_Des2(cmd).ToLower();
26 cmd = cmd.Replace("/", "\\").Replace("\"", "");
27 string dir = HttpContext.Current.Request.PhysicalApplicationPath;
28 if (File.Exists(dir + cmd))
29 {
30 int finded = (dir + cmd).LastIndexOf(".wdata");
31 string FileName = (dir + cmd).Remove(finded);
32
33 string ext = System.IO.Path.GetExtension(FileName);
34 string fname = System.IO.Path.GetFileName(FileName);
35
36
37 HttpContext.Current.Response.Clear();
38 HttpContext.Current.Response.Buffer = true;
39 HttpContext.Current.Response.Charset = "UTF-8";
40 HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fname, System.Text.Encoding.GetEncoding("UTF-8")));
41 HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
42 HttpContext.Current.Response.ContentType = GetContentType(ext);
43 HttpContext.Current.Response.WriteFile(FileName + ".wdata");
44 HttpContext.Current.Response.Flush();
45 HttpContext.Current.Response.End();
46
47
48 HttpContext.Current.Response.Redirect(FileName + ".wdata");
49 }
50 }
51 else
52 {
53 var cmdtwo = PageUtility.GetRequestString("noEncryptCmd");
54 if (!string.IsNullOrEmpty(cmdtwo))
55 {
56 cmdtwo = cmdtwo.Replace("\"", "").Trim();
57 cmdtwo = cmdtwo.Replace("/", "\\").Replace("\"", "");
58 string dir = HttpContext.Current.Request.PhysicalApplicationPath;
59 if (File.Exists(dir + cmdtwo))
60 {
61 int finded = (dir + cmdtwo).LastIndexOf(".wdata");
62 string FileName = (dir + cmdtwo).Remove(finded);
63
64 string ext = System.IO.Path.GetExtension(FileName);
65 string fname = System.IO.Path.GetFileName(FileName);
66
67
68 HttpContext.Current.Response.Clear();
69 HttpContext.Current.Response.Buffer = true;
70 HttpContext.Current.Response.Charset = "UTF-8";
71 HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fname, System.Text.Encoding.GetEncoding("UTF-8")));
72 HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
73 HttpContext.Current.Response.ContentType = GetContentType(ext);
74 HttpContext.Current.Response.WriteFile(FileName + ".wdata");
75 HttpContext.Current.Response.Flush();
76 HttpContext.Current.Response.End();
77
78 HttpContext.Current.Response.Redirect(FileName + ".wdata");
79 }
80 }
81 }
82 }
83
84 private string GetContentType(string ext)
85 {
86 switch (ext.ToLower().Trim('.'))
87 {
88
89 //"application/vnd.openxmlformats-officedocument.presentationml.presentation" (for . files)
90 //"" (for .ppsx files)
91 //"" (for . files)
92 //"" (for . files)
93 //"" (for . files)
94
95 case "docx": return "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
96 case "dotx": return "application/vnd.openxmlformats-officedocument.wordprocessingml.template";
97 case "pptx": return "application/vnd.openxmlformats-officedocument.presentationml.slideshow";
98 case "potx": return "application/vnd.openxmlformats-officedocument.presentationml.template";
99 case "xlsx": return "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
100 case "xltx": return "application/vnd.openxmlformats-officedocument.spreadsheetml.template";
101 case "accdb":
102 case "accde":
103 case "accdt":
104 return "application/msaccess";
105 case "mdb": return "application/x-msaccess";
106 case "ez": return "application/andrew-inset";
107 case "hqx": return "application/mac-binhex40";
108 case "cpt": return "application/mac-compactpro";
109 case "doc": return "application/msword";
110 case "bin": return "application/octet-stream";
111 case "dms": return "application/octet-stream";
112 case "lha": return "application/octet-stream";
113 case "lzh": return "application/octet-stream";
114 case "exe": return "application/octet-stream";
115 case "class": return "application/octet-stream";
116 case "so": return "application/octet-stream";
117 case "dll": return "application/octet-stream";
118 case "oda": return "application/oda";
119 case "pdf": return "application/pdf";
120 case "ai": return "application/postscript";
121 case "eps": return "application/postscript";
122 case "ps": return "application/postscript";
123 case "smi": return "application/smil";
124 case "smil": return "application/smil";
125 case "mif": return "application/vnd.mif";
126 case "xls": return "application/vnd.ms-excel";
127 case "ppt": return "application/vnd.ms-powerpoint";
128 case "wbxml": return "application/vnd.wap.wbxml";
129 case "wmlc": return "application/vnd.wap.wmlc";
130 case "wmlsc": return "application/vnd.wap.wmlscriptc";
131 case "bcpio": return "application/x-bcpio";
132 case "vcd": return "application/x-cdlink";
133 case "pgn": return "application/x-chess-pgn";
134 case "cpio": return "application/x-cpio";
135 case "csh": return "application/x-csh";
136 case "dcr": return "application/x-director";
137 case "dir": return "application/x-director";
138 case "dxr": return "application/x-director";
139 case "dvi": return "application/x-dvi";
140 case "spl": return "application/x-futuresplash";
141 case "gtar": return "application/x-gtar";
142 case "hdf": return "application/x-hdf";
143 case "js": return "application/x-javascript";
144 case "skp": return "application/x-koan";
145 case "skd": return "application/x-koan";
146 case "skt": return "application/x-koan";
147 case "skm": return "application/x-koan";
148 case "latex": return "application/x-latex";
149 case "nc": return "application/x-netcdf";
150 case "cdf": return "application/x-netcdf";
151 case "sh": return "application/x-sh";
152 case "shar": return "application/x-shar";
153 case "swf": return "application/x-shockwave-flash";
154 case "sit": return "application/x-stuffit";
155 case "sv4cpio": return "application/x-sv4cpio";
156 case "sv4crc": return "application/x-sv4crc";
157 case "tar": return "application/x-tar";
158 case "tcl": return "application/x-tcl";
159 case "tex": return "application/x-tex";
160 case "texinfo": return "application/x-texinfo";
161 case "texi": return "application/x-texinfo";
162 case "t": return "application/x-troff";
163 case "tr": return "application/x-troff";
164 case "roff": return "application/x-troff";
165 case "man": return "application/x-troff-man";
166 case "me": return "application/x-troff-me";
167 case "ms": return "application/x-troff-ms";
168 case "ustar": return "application/x-ustar";
169 case "src": return "application/x-wais-source";
170 case "xhtml": return "application/xhtml+xml";
171 case "xht": return "application/xhtml+xml";
172 case "zip": return "application/zip";
173 case "au": return "audio/basic";
174 case "snd": return "audio/basic";
175 case "mid": return "audio/midi";
176 case "midi": return "audio/midi";
177 case "kar": return "audio/midi";
178 case "mpga": return "audio/mpeg";
179 case "mp2": return "audio/mpeg";
180 case "mp3": return "audio/mpeg";
181 case "aif": return "audio/x-aiff";
182 case "aiff": return "audio/x-aiff";
183 case "aifc": return "audio/x-aiff";
184 case "m3u": return "audio/x-mpegurl";
185 case "ram": return "audio/x-pn-realaudio";
186 case "rm": return "audio/x-pn-realaudio";
187 case "rpm": return "audio/x-pn-realaudio-plugin";
188 case "ra": return "audio/x-realaudio";
189 case "wav": return "audio/x-wav";
190 case "pdb": return "chemical/x-pdb";
191 case "xyz": return "chemical/x-xyz";
192 case "bmp": return "image/bmp";
193 case "gif": return "image/gif";
194 case "ief": return "image/ief";
195 case "jpeg": return "image/jpeg";
196 case "jpg": return "image/jpeg";
197 case "jpe": return "image/jpeg";
198 case "png": return "image/png";
199 case "tiff": return "image/tiff";
200 case "tif": return "image/tiff";
201 case "djvu": return "image/vnd.djvu";
202 case "djv": return "image/vnd.djvu";
203 case "wbmp": return "image/vnd.wap.wbmp";
204 case "ras": return "image/x-cmu-raster";
205 case "pnm": return "image/x-portable-anymap";
206 case "pbm": return "image/x-portable-bitmap";
207 case "pgm": return "image/x-portable-graymap";
208 case "ppm": return "image/x-portable-pixmap";
209 case "rgb": return "image/x-rgb";
210 case "xbm": return "image/x-xbitmap";
211 case "xpm": return "image/x-xpixmap";
212 case "xwd": return "image/x-xwindowdump";
213 case "igs": return "model/iges";
214 case "iges": return "model/iges";
215 case "msh": return "model/mesh";
216 case "mesh": return "model/mesh";
217 case "silo": return "model/mesh";
218 case "wrl": return "model/vrml";
219 case "vrml": return "model/vrml";
220 case "css": return "text/css";
221 case "html": return "text/html";
222 case "htm": return "text/html";
223 case "asc": return "text/plain";
224 case "txt": return "text/plain";
225 case "rtx": return "text/richtext";
226 case "rtf": return "text/rtf";
227 case "sgml": return "text/sgml";
228 case "sgm": return "text/sgml";
229 case "tsv": return "text/tab-separated-values";
230 case "wml": return "text/vnd.wap.wml";
231 case "wmls": return "text/vnd.wap.wmlscript";
232 case "etx": return "text/x-setext";
233 case "xsl": return "text/xml";
234 case "xml": return "text/xml";
235 case "mpeg": return "video/mpeg";
236 case "mpg": return "video/mpeg";
237 case "mpe": return "video/mpeg";
238 case "qt": return "video/quicktime";
239 case "mov": return "video/quicktime";
240 case "mxu": return "video/vnd.mpegurl";
241 case "avi": return "video/x-msvideo";
242 case "movie": return "video/x-sgi-movie";
243 case "ice": return "x-conference/x-cooltalk";
244 default:
245 return "application/octet-stream";
246 }
247
248 }
249 }
250 }
Demo下載：
http://files.cnblogs.com/files/xinchun/pathEncrypt.zip
