C#.net从ftp下载文件到本地

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mb5fe18e32e4691 2019-08-01 12:37:00

文章标签 本地文件 ftp服务器 c#.net 下载文件配置文件 文章分类 代码人生

  /*首先从配置文件读取ftp的登录信息*/

string TempFolderPath = System.Configuration.ConfigurationManager.AppSettings["TempFolderPath"].ToString();
 string FtpUserName = System.Configuration.ConfigurationManager.AppSettings["FtpUserName"].ToString();
 string FtpPassWord = System.Configuration.ConfigurationManager.AppSettings["FtpPassWord"].ToString();
 string LocalFileExistsOperation = System.Configuration.ConfigurationManager.AppSettings["LocalFileExistsOperation"].ToString();


Uri uri = new Uri(FtpPath);
string FileName = Path.GetFullPath(TempFolderPath) + Path.DirectorySeparatorChar.ToString() +  Path.GetFileName(uri.LocalPath); 

//创建一个文件流
FileStream fs = null;
Stream responseStream = null;
try {
    //创建一个与FTP服务器联系的FtpWebRequest对象
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
    //设置请求的方法是FTP文件下载
    request.Method = WebRequestMethods.Ftp.DownloadFile;

    //连接登录FTP服务器
    request.Credentials = new NetworkCredential(FtpUserName, FtpPassWord);

    //获取一个请求响应对象
    FtpWebResponse response = (FtpWebResponse)request.GetResponse();
    //获取请求的响应流
    responseStream = response.GetResponseStream();

    //判断本地文件是否存在，如果存在，则打开和重写本地文件
    if (File.Exists(FileName))               {
        if (LocalFileExistsOperation == "write"){ 
            fs = File.Open(FileName, FileMode.Open, FileAccess.ReadWrite);
        } 
    }
    //判断本地文件是否存在，如果不存在，则创建本地文件
    else {
        fs = File.Create(FileName);
    }
    if (fs != null) {
        int buffer_count = 65536;
        byte[] buffer = new byte[buffer_count];
        int size = 0;
        while ((size = responseStream.Read(buffer, 0, buffer_count)) > 0) {
            fs.Write(buffer, 0, size);
        }
        fs.Flush();
        fs.Close();
        responseStream.Close();
    }
} finally {
    if (fs != null)
        fs.Close();
    if (responseStream != null)
        responseStream.Close();
}