上传下载文件（并处理了下载文件名乱码问题）

来源：互联网发布：qq飞车冲锋战神数据编辑：程序博客网时间：2024/05/20 04:47

方法一：
解决乱码问题关键就一句: string strTemp = System.Web.HttpUtility.UrlEncode(strName, System.Text.Encoding.UTF8);//解决文件名乱码

        protected string strConn = Common.Config.GetAppSettingsKeyValue("DBConnectString");
        protected System.Data.OleDb.OleDbConnection conn;
        protected System.Data.OleDb.OleDbCommand     cmd;
        protected System.Data.OleDb.OleDbDataReader dr;

        private void Download(string field, string id)
        {
            try
            {
                string strCmd = "select * from doc_body where id = " + id;
                conn = new OleDbConnection(strConn);
                cmd = new OleDbCommand(strCmd,conn);
                conn.Open();
                dr = cmd.ExecuteReader();
                dr.Read();
                int nSize = (int)dr["doc_size"];
                string strContentType = (string)dr["ContentType"];
                string strName = (string)dr["doc_name"];
                byte [] data = (byte[])dr[field];
                if(nSize == 0)
                {
                    message.Text = "<font color=#0000ff>没有文件下载!</font>";
                }
                else
                {
                    Response.Clear();
                    Response.Buffer = true;
                    //Response.Charset = "utf-8";
                    //Response.ContentEncoding=System.Text.Encoding.GetEncoding("utf-8");
                    //utf-8,gb2312,big5
                    Response.ContentType = strContentType;
                    //application/ms-excel,application/ms-word,application/ms-txt,application/ms-html或其他浏览器可直接支持文档
                    string strTemp = System.Web.HttpUtility.UrlEncode(strName, System.Text.Encoding.UTF8);//解决文件名乱码
                    Response.AppendHeader("content-disposition", "attachment;filename=" + strTemp);//附件下载
                    //Response.AppendHeader("content-disposition", "online;filename=" + strName);//在线打开
                    Response.OutputStream.Write(data, 0, nSize);
                }
            }
            catch(Exception exp)
            {
                Common.utility.MessageBox(this,"下载失败!/n错误信息:/n"+exp.Message);
            }
            finally
            {
                conn.Close();
            }
        }

方法二：
protected void Button1_Click(object sender, EventArgs e)
{
/*
微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
代码如下：
*/

Response.ContentType = "application/x-zip-compressed";
Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
string filename = Server.MapPath("DownLoad/aaa.zip");
Response.TransmitFile(filename);
}

//WriteFile实现下载
protected void Button2_Click(object sender, EventArgs e)
{
/*
using System.IO;

*/

string fileName ="aaa.zip";//客户端保存的文件名
string filePath=Server.MapPath("DownLoad/aaa.zip");//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.zip";//客户端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.zip");//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.zip";//客户端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.zip");//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();

}

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