(4)FTP服务器下载文件

上一篇中，我们提到了怎么从FTP服务器下载文件。现在来具体讲述一下。

首先是路径配置。。

所以此处我们需要一个app.config来设置路径。

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

    <startup>

        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />

    </startup>

  <appSettings>

    <add key="OnlineBankRequestFolder" value ="ftp://Online/Request/" />

    <add key="OnlineBankResponseFolder" value ="ftp://Online/Response/" />

    <add key ="ftpUser" value ="fsscftp"/>

    <add key ="ftpPassword" value ="fssc123"/>

  </appSettings>

</configuration>

另外在c#中需要获取路径

public string ftpUser = ConfigurationManager.AppSettings["ftpUser"];

public string ftpPassword = ConfigurationManager.AppSettings["ftpPassword"];

public string downfolder = ConfigurationManager.AppSettings["OnlineBankRequestFolder"] + "/Request.txt";

public string savefolder = ConfigurationManager.AppSettings["OnlineBankResponseFolder"]+"/Response.xml";

然后还需要建立一个ftp请求。这时就需要建立一个ftpclient的类

  public class FtpClient

    {

        private string userName;

        private string passWord;

        private byte[] buffer = new byte[ * ];

        public FtpClient(string userName, string passWord)

        {

            this.userName = userName;

            this.passWord = passWord;

        }

        /**/

        /// <summary>

        /// 创建ftp请求信息

        /// </summary>

        /// <param name="url">目标url地址</param>

        /// <param name="useBinary">是否使用二进制传输</param>

        private FtpWebRequest GetRequest(string url, bool useBinary)

        {

            FtpWebRequest ftpRequest = (FtpWebRequest)WebRequest.Create(url);

            ftpRequest.Credentials = new NetworkCredential(userName, passWord);

            ftpRequest.UseBinary = useBinary;

            ftpRequest.KeepAlive = true;

            return ftpRequest;

        }

        //下载文件

        public void DownloadFile(string localFile, string remoteFile, bool useBinary)

        {

            FtpWebRequest request = GetRequest(remoteFile, useBinary);

            request.Method = WebRequestMethods.Ftp.DownloadFile;

            try

            {

                WriteStream(request.GetResponse().GetResponseStream(),File.Create(localFile));

            }

            catch (Exception ex)

            {

                throw (ex);

            }

        }

        //将orgStream中的内容拷贝到desStream中

        private void WriteStream(Stream orgStream, Stream desStream)

        {

            int num;

            while ((num = orgStream.Read(buffer, , buffer.Length)) > )

            {

                desStream.Write(buffer, , num);

            }

            orgStream.Close();

            desStream.Close();

        }

    }

这个类在下载时就会用到。另外还会用到一个方法，是得到保存路径。

  public string GetDataFileSavePath()

        {

            //FTP待导入数据文件存放的路径

            string directory = savefolder;

            //if (!(Directory.Exists(directory)))

            //    Directory.CreateDirectory(directory);

            string fileName = "Cache_file.txt";

            //保存路径

            string savePath = System.IO.Path.Combine(directory, fileName);

            //if (!File.Exists(savePath))

            //    File.Create(savePath);

            return savePath;

        }

好了。准备工作完成了。现在就可以下载了。

private void FTPDown(string txtpath,string strErrMsg="",string encodingCode = "GB2312", string strSplit = "|")

{

　　string savePath = downfolder;

　　if(txtpath.IndexOf("ftp")>=){

　　//创建ftp请求信息

　　var ftpRequest = new FtpClient(ftpUser, ftpPassword);

　　savePath = GetDataFileSavePath();

　　ftpRequest.DownloadFile(savePath, txtpath, true);

　　}
}

这样FTP的文件就下载到本地的一个路径下面了。

巴特西

(4)FTP服务器下载文件

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