在ASPX页面中使用c#代码从base64数据写入文件

本文关键字：base64 数据 文件 代码 ASPX | 更新日期: 2023-09-27 18:02:35

我正在尝试采用文件的base64加密版本，解密它，并将文件写入服务器。我不知道为什么这段代码不工作，任何帮助将不胜感激，因为现在我得到的错误:File Not Found。下面是我的代码:

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.IO" %>
<script runat="server">
  public void Page_Load(object sender, EventArgs e){
    HttpContext c = HttpContext.Current;
    //string data = Decode(c.Request["file"]);
    //string name = c.Request["name"];
    string name = "target.docx";
    string data = Decode("SUPER LONG BASE 64, DIDNT POST BECAUSE WAY TOO LARGE");
    StreamWriter writer = File.CreateText(Server.MapPath("~/services/temp/"+name));
    // Error generated here, after previous line.
    writer.WriteLine(data);
    writer.Close();
    Response.Redirect("temp/"+name);
  }
  public string Decode(string str){
    byte[] decbuff = Convert.FromBase64String(str);
    return System.Text.Encoding.UTF8.GetString(decbuff);
  }
</script>

在ASPX页面中使用c#代码从base64数据写入文件

我想明白了，我需要在wwwroot上创建一个本地目录，因为在sharepoint设计器中创建的目录不是物理的，下面是代码。

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.IO" %>
<script runat="server">
  public void Page_Load(object sender, EventArgs e){
    HttpContext c = HttpContext.Current;
    //string data = Decode(c.Request["file"]);
    //string name = c.Request["name"];
    Response.Write(Server.MapPath("/temp/hurrdurr.txt"));
    string name = "target.docx";
    string data = "THE GIANT BASE 64 DATA";
    using(StreamWriter writer = new StreamWriter(Server.MapPath("/temp/"+name), true)){
      writer.WriteLine(Decode(data));
      writer.Close();
    }
    FileStream fs = File.Open(Server.MapPath("/temp/"+name), FileMode.Open);
    byte[] file = new byte[fs.Length];
    fs.Read(file, 0, Convert.ToInt32(fs.Length));
    fs.Close();
    Response.AddHeader("Content-disposition", "attachment; filename=" + name);
    Response.ContentType = "application/octet-stream";
    Response.BinaryWrite(file);
    Response.End();
  }
  public string Decode(string str){
    byte[] decbuff = Convert.FromBase64String(str);
    return System.Text.Encoding.UTF8.GetString(decbuff);
  }
</script>

您也可以完全避免使用临时文件。

string sName = "target.docx";
string sBase64 = "THE GIANT BASE 64 DATA";        
Response.AddHeader("Content-disposition", "attachment; filename=" + sName);
Response.ContentType = "application/octet-stream";
Response.BinaryWrite(System.Convert.FromBase64String(sBase64));
Response.End();
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