ASP.NET 文件的上传与下载

前端页面：

 1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileOption.aspx.cs" Inherits="FileOption" %>
 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     <style type="text/css">
10         .auto-style1 {
11             width: 100%;
12         }
13         .auto-style2 {
14             width: 121px;
15         }
16     </style>
17 </head>
18 <body>
19     <form id="form1" runat="server">
20     <div>
21     
22         <table class="auto-style1">
23             <tr>
24                 <td class="auto-style2">文件名称：</td>
25                 <td>
26                     <asp:TextBox ID="txtFileName" runat="server"></asp:TextBox>
27                 </td>
28             </tr>
29             <tr>
30                 <td class="auto-style2">浏览：</td>
31                 <td><asp:FileUpload ID="UploadFile" runat="server"/></td>
32             </tr>
33             <tr>
34                 <td class="auto-style2">&nbsp;</td>
35                 <td>
36                     <asp:Button ID="btnFile" runat="server" OnClick="btnFile_Click" Text="上传" />
37                     <asp:Label ID="msg" runat="server" ForeColor="Red"></asp:Label>
38                 </td>
39             </tr>
40         </table>
41     </div>
42         <asp:Repeater ID="Repeater1" runat="server" onitemcommand="down_file_Click">
43             <ItemTemplate>
44                 <table>
45                     <tr>
46                         <td >文件名称：</td>
47                         <td><b><asp:Label ID="FileTitle" runat="server" Text='<%#Eval("文件名称") %>'></asp:Label></b></td>
48                         <td>类型：</td>
49                         <td><%#Eval("类型") %></td>                
50                         <td>文件大小：</td>
51                         <td><%#Eval("文件大小") %>KB</td>
52                         <td>上传时间：</td>
53                         <td ><%#Eval("上传时间") %></td>
54                         <td ><asp:LinkButton ID="LinkButton1" CommandArgument='<%#Eval("link") %>' runat="server">下载文件</asp:LinkButton> </td>
55                     </tr>           
56                 </table>
57                 <br />
58             </ItemTemplate>
59         </asp:Repeater>
60     </form>
61 </body>
62 </html>

View Code

后台实现代码：

  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;
  7 using System.IO;
  8 using System.Data;
  9 using System.Text;
 10 
 11 public partial class FileOption : System.Web.UI.Page
 12 {
 13     protected void Page_Load(object sender, EventArgs e)
 14     {
 15         GrvDataBin(FindFile());
 16     }
 17     /// <summary>
 18     /// 上传文件
 19     /// </summary>
 20     /// <param name="sender"></param>
 21     /// <param name="e"></param>
 22     protected void btnFile_Click(object sender, EventArgs e)
 23     {
 24         msg.Text = "";
 25         //自定义的 File 类
 26         File file = new File();
 27         if (string.IsNullOrEmpty(txtFileName.Text))
 28         {
 29             msg.Text = "请输入文件名称！";
 30             return;
 31         }
 32         if (UploadFile.HasFile)
 33         {
 34             try
 35             {
 36                 DateTime upload = DateTime.Now;
 37                 //获取文件的扩展名（文件类型）
 38                 string type = Path.GetExtension(UploadFile.PostedFile.FileName);
 39                 //设置上传文件的路径
 40                 string path = Server.MapPath("Upload/" + txtFileName.Text + type);
 41                 //获取文件的大小
 42                 string size = (UploadFile.PostedFile.ContentLength / 1024).ToString();
 43                 //保存文件(保存到服务器指定路径中)
 44                 UploadFile.SaveAs(path);
 45                 msg.Text = "上传成功！";
 46                 //上传成功后更新数据
 47                 GrvDataBin(FindFile());
 48             }
 49             catch (Exception err)
 50             {
 51                 msg.Text = "上传失败！" + err.Message;
 52             }
 53         }
 54         else
 55             msg.Text = "请选择文件！";
 56     }
 57     /// <summary>
 58     /// 获取指定目录下的所有文件的集合
 59     /// </summary>
 60     /// <returns>返回一个File类的集合</returns>
 61     private List<File> FindFile()
 62     {
 63         string path = Server.MapPath("Upload/");//获取文件所在目录
 64         string[] paths = Directory.GetFiles(path);//获取目录中所有文件路径
 65         List<File> list = new List<File>();
 66         foreach(string filePath in paths)
 67         {
 68             string size = 0.ToString();
 69             string time = DateTime.Now.ToShortTimeString();
 70             GetFileSize(filePath,out size,out time);
 71             File file = new File(filePath,size,time);
 72             list.Add(file);
 73         }
 74         return list;
 75     }
 76     /// <summary>
 77     /// 绑定文件数据信息
 78     /// </summary>
 79     /// <param name="list">传入的文件集合</param>
 80     public void GrvDataBin(List<File> list)
 81     {
 82 
 83         DataView dv = new DataView();
 84         DataTable dt = new DataTable("fileMeta");
 85         {
 86             dt.Columns.Add("文件名称");
 87             dt.Columns.Add("类型");
 88             dt.Columns.Add("上传时间");
 89             dt.Columns.Add("文件大小");
 90             dt.Columns.Add("link");
 91         }
 92         foreach (File fileM in list)
 93         {
 94             DataRow row = dt.NewRow();
 95             row[0] = fileM.FileName;
 96             row[1] = fileM.Type;
 97             row[2] = fileM.UploadTime;
 98             row[3] = fileM.Size;
 99             row[4] = fileM.FilePath;
100             dt.Rows.Add(row);
101         }
102         dv.Table = dt;
103         Repeater1.DataSource = dv;
104         Repeater1.DataBind();
105     }
106     /// <summary>
107     /// 获取文件大小和时间
108     /// </summary>
109     /// <param name="filePath"></param>
110     /// <returns></returns>
111     private string GetFileSize(string filePath,out string size,out string time)
112     {
113         FileInfo file = new FileInfo(filePath);
114         size =(Convert.ToDouble(file.Length)/1024.0).ToString("0.00");
115         time = file.CreationTime.ToShortTimeString();
116         return null;
117     }
118     /// <summary>
119     /// 文件下载
120     /// </summary>
121     /// <param name="sender"></param>
122     /// <param name="e"></param>
123     protected void down_file_Click(object sender, RepeaterCommandEventArgs e)
124     {//注释的为流下载
125         //FileStream fs = null;
126         try
127         { 
128             // 获取文件的路径
129             string filePath = e.CommandArgument.ToString();
130             // 获取文件的名称
131             string fileName = ((Label)e.Item.FindControl("FileTitle")).Text.ToString();
132             //fs = System.IO.File.OpenRead(filePath);
133             //long count = 1024;
134             //byte[] buffer = new byte[count];
135             //Response.Buffer = true;
136             // 设置输出流的 MIME 类型
137             Response.ContentType = "application/octet-stream";
138             // 通知浏览器下载而不是打开  
139             Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(fileName));//下载时要保存的默认文件名
140             //while (count == 1024)
141             //{
142             //    count = fs.Read(buffer, 0, 1024);
143             //    Response.BinaryWrite(buffer);
144             //    Response.Flush();
145             //    Response.End();
146             //}
147             Response.TransmitFile(filePath);
148             Response.Flush();
149             Response.End();
150         }
151         catch (Exception)
152         {
153             return;
154         }
155         finally
156         {
157             //fs.Close();
158         }
159 
160     }
161 }

View Code

自定义的File 类用于保存文件的属性

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;

/// <summary>
/// File 的摘要说明
/// 自定义的文件信息类
/// </summary>
public class File
{
    #region private prop
    private string fileName;
    private string type;
    private string size;
    private string filePath;
    private string uploadTime;
    #endregion
    #region public prop
    public string Type
    {
        get
        {
            return type;
        }

        set
        {
            type = value;
        }
    }

    public string Size
    {
        get
        {
            return size;
        }

        set
        {
            size = value;
        }
    }

    public string FilePath
    {
        get
        {
            return filePath;
        }

        set
        {
            filePath = value;
        }
    }

    public string UploadTime
    {
        get
        {
            return uploadTime;
        }

        set
        {
            uploadTime = value;
        }
    }

    public string FileName
    {
        get
        {
            return fileName;
        }

        set
        {
            fileName = value;
        }
    }
    #endregion
    public File()
    {
        //初始化文件大小
        Size = (1024 * 1024).ToString();
    }

    public File(string filePath,string size,string time)
    {
        FilePath = filePath;
        string[] names = filePath.Split('\');
        FileName = names[names.Length-1];
        Type = filePath.Split('.')[1];
        Size = size;
        UploadTime = time;
    }
}

View Code

这样简单的文件上传与下载就完成了。。。。

附上效果图：

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原文地址：https://www.cnblogs.com/qihangzj/p/7650846.html