【net】ASP.NET中下载文件的几种实例代码-下载-文件

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ASP.NET中下载文件的几种实例代码

  //TransmitFile实现下载
    protected void Button1_Click(object sender, EventArgs e)
    {
       
        Response.ContentType="application/x-zip-compressed";
        Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
        string filename=Server.MapPath("DownLoad/z.zip");
        Response.TransmitFile(filename);
    }

    //WriteFile实现下载
    protected void Button2_Click(object sender, EventArgs e)
    {
       
        string fileName="asd.txt";//客户端保存的文件名
        string filePath=Server.MapPath("DownLoad/aaa.txt");//路径

        FileInfo fileInfo=new FileInfo(filePath);
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
        Response.AddHeader("Content-Length", fileInfo.Length.ToString());
        Response.AddHeader("Content-Transfer-Encoding", "binary");
        Response.ContentType="application/octet-stream";
        Response.ContentEncoding=System.Text.Encoding.GetEncoding("gb2312");
        Response.WriteFile(fileInfo.FullName);
        Response.Flush();
        Response.End();
    }

    //WriteFile分块下载
    protected void Button3_Click(object sender, EventArgs e)
    {
        string fileName="aaa.txt";//客户端保存的文件名
        string filePath=Server.MapPath("DownLoad/aaa.txt");//路径

        System.IO.FileInfo fileInfo=new System.IO.FileInfo(filePath);

        if (fileInfo.Exists==true)
        {
            const long ChunkSize=102400;//100K 每次读取文件，只读取100K，这样可以缓解服务器的压力
            byte[] buffer=new byte[ChunkSize];

            Response.Clear();
            System.IO.FileStream iStream=System.IO.File.OpenRead(filePath);
            long dataLengthToRead=iStream.Length;//获取下载的文件总大小
            Response.ContentType="application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
            while (dataLengthToRead > 0 && Response.IsClientConnected)
            {
                int lengthRead=iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
                Response.OutputStream.Write(buffer, 0, lengthRead);
                Response.Flush();
                dataLengthToRead=dataLengthToRead - lengthRead;
            }
            Response.Close();
        }
    }

    //流方式下载
    protected void Button4_Click(object sender, EventArgs e)
    {
        string fileName="aaa.txt";//客户端保存的文件名
        string filePath=Server.MapPath("DownLoad/aaa.txt");//路径

        //以字符流的形式下载文件
        FileStream fs=new FileStream(filePath, FileMode.Open);
        byte[] bytes=new byte[(int)fs.Length];
        fs.Read(bytes, 0, bytes.Length);
        fs.Close();
        Response.ContentType="application/octet-stream";
        //通知浏览器下载文件而不是打开
        Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }

//----------------------------------------------------------

public void DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody )
{

　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires=0;
　　WebForm.Response.Buffer=true;
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");
　　//'文件名称
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'");
　　WebForm.Response.ContentType="Application/octet-stream";
　　//'文件内容
　　WebForm.Response.Write(FileBody);//-----------
    WebForm.Response.End();
}

//上面这段代码是下载一个动态产生的文本文件，若这个文件已经存在于服务器端的实体路径，则可以通过下面的函数：

public void DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath )
{
　　WebForm.Response.ClearHeaders();
　　WebForm.Response.Clear();
　　WebForm.Response.Expires=0;
    WebForm.Response.Buffer=true;
　　WebForm.Response.AddHeader("Accept-Language", "zh-tw");
　　//文件名称
　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='" + System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" );
　　WebForm.Response.ContentType="Application/octet-stream";
　　//文件内容
　　WebForm.Response.Write(System.IO.File.ReadAllBytes(FilePath));//---------
　　WebForm.Response.End();
}
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

--保存文档
string docName, docExtended;
Stream doc=fuDoc.FileContent;
int docLength=fuDoc.PostedFile.ContentLength;
byte[] docData=new byte[docLength];
doc.Read(docData, 0, docLength);
docExtended=fuDoc.FileName.Substring(fuDoc.FileName.IndexOf("."));
if (string.IsNullOrEmpty(tbDoc.Text))
docName=fuDoc.FileName;
else
docName=tbDoc.Text + docExtended;
SafetyDocInfo data=new SafetyDocInfo(ddlSort.Text, docName, fuDoc.PostedFile.ContentType, docData);
SafetyDoc safety=new SafetyDoc();
safety.Insert(data);
tbDoc.Text=string.Empty;
－－打开文档
public void ViewSafetyDoc(string pDocSort, string pDocName)
{
OracleParameter[] parms=GetSafetyDocParm(SQL_View_SafetyDoc);
parms[0].Value=pDocSort;
parms[1].Value=pDocName;
using (OracleDataReader rdr=OracleHelper.ExecuteReader(OracleHelper.ConnectionString, CommandType.Text, SQL_View_SafetyDoc, parms))
{
while (rdr.Read())
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer=true;
HttpContext.Current.Response.Charset="GB2312";
HttpContext.Current.Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");
HttpContext.Current.Response.ContentType=rdr.GetString(1);
HttpContext.Current.Response.BinaryWrite((byte[])rdr["Doc"]);
string FileName=rdr.GetString(0);
FileName=System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8);
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
}
}
}     

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