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asp.net实现ftp上传代码(解决大文件上传问题)

2013-01-06 14:03 856 查看

原来使用asp.net上传控件上传 那个虽然简单但是页面不是很友好 然后就用了uploadify上传控件 这个控件虽然界面友好 但是大文件还是不能上传 而且在不同的浏览器会出现session丢失问题 所以我到了个ftp上传的方法

以下是具体代码

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using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Net;
using System.Text;

public partial class _Default : System.Web.UI.Page
{
//以下字段配置在web.config
private string ftpServerIP = "127.0.0.1";//服务器ip
private string ftpUserID = "FTPTEST";//用户名FTPTEST
private string ftpPassword = "ftptest";//密码
protected void Page_Load(object sender, EventArgs e)
{

if (MyFile.Value != "")
{
//string a = MyFile.;
}

}

//ftp的上传功能
private void Upload(string filename)
{
FileInfo fileInf = new FileInfo(filename);

string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;
FtpWebRequest reqFTP;

// 根据uri创建FtpWebRequest对象
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));

// ftp用户名和密码
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

// 默认为true,连接不会被关闭
// 在一个命令之后被执行
reqFTP.KeepAlive = false;

// 指定执行什么命令
reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

// 指定数据传输类型
reqFTP.UseBinary = true;

// 上传文件时通知服务器文件的大小
reqFTP.ContentLength = fileInf.Length;

// 缓冲大小设置为2kb
int buffLength = 2048;

byte[] buff = new byte[buffLength];
int contentLen;

// 打开一个文件流 (System.IO.FileStream) 去读上传的文件
FileStream fs = fileInf.OpenRead();
try
{
// 把上传的文件写入流
Stream strm = reqFTP.GetRequestStream();

// 每次读文件流的2kb
contentLen = fs.Read(buff, 0, buffLength);

// 流内容没有结束
while (contentLen != 0)
{
// 把内容从file stream 写入 upload stream
strm.Write(buff, 0, contentLen);

contentLen = fs.Read(buff, 0, buffLength);
}

// 关闭两个流
strm.Close();
fs.Close();
this.Page.RegisterStartupScript("", "<script>alert('成功')</script>");
}
catch (Exception ex)
{
// MessageBox.Show(ex.Message, "Upload Error");
Response.Write("Upload Error:" + ex.Message);
}
}

//从ftp服务器上下载文件的功能
private void Download(string filePath, string fileName)
{
FtpWebRequest reqFTP;

try
{
FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileName));

reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

reqFTP.UseBinary = true;

reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

Stream ftpStream = response.GetResponseStream();

long cl = response.ContentLength;

int bufferSize = 2048;

int readCount;

byte[] buffer = new byte[bufferSize];

readCount = ftpStream.Read(buffer, 0, bufferSize);

while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);

readCount = ftpStream.Read(buffer, 0, bufferSize);
}

ftpStream.Close();

outputStream.Close();

response.Close();
}
catch (Exception ex)
{
Response.Write("Download Error:" + ex.Message);
}
}

//从ftp服务器上获得文件列表
public string[] GetFileList()
{
string[] downloadFiles;
StringBuilder result = new StringBuilder();
FtpWebRequest reqFTP;
// HttpWebRequest reqFTP;
try
{
reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/"));
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
WebResponse response = reqFTP.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string line = reader.ReadLine();
while (line != null)
{
result.Append(line);
result.Append("\n");
line = reader.ReadLine();
}
// to remove the trailing '\n'
result.Remove(result.ToString().LastIndexOf('\n'), 1);
reader.Close();
response.Close();
return result.ToString().Split('\n');
}
catch (Exception ex)
{
downloadFiles = null;
return downloadFiles;
}
}

protected void Button1_Click(object sender, EventArgs e)
{
Upload("F:\\美国队长DVD中字.rmvb");
}
protected void Button2_Click(object sender, EventArgs e)
{

}
}
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