如何从FTP服务器下载ZipFile

Question

我在ftp服务器中有zip文件，这个zip文件包含多个然后一个xml文件，我想下载这个zip文件并保存到本地磁盘，我写下面的代码，我下载文件，但是当我尝试解压这个压缩它把我错误文件已损坏......

FtpWebRequest request = (FtpWebRequest)WebRequest.Create(_remoteHost + file); 
request.Method = WebRequestMethods.Ftp.DownloadFile; 
request.Credentials = new NetworkCredential(_remoteUser, _remotePass); 
FtpWebResponse response = (FtpWebResponse)request.GetResponse(); 
Stream responseStream = response.GetResponseStream(); 
StreamReader reader = new StreamReader(responseStream); 

StreamWriter writer = new StreamWriter(destination); 
writer.Write(reader.ReadToEnd()); 

writer.Close(); 
reader.Close(); 
response.Close(); 

Answer 1

您窜通过StreamReader的FTP请求的结果。这对处理字符编码通常有好处，但是在处理二进制数据（即zip文件）时，您不希望这样做。相反，您应该直接从流中读取数据。喜欢的东西：

FtpWebRequest request = (FtpWebRequest)WebRequest.Create(_remoteHost + file); 
request.Method = WebRequestMethods.Ftp.DownloadFile; 
request.Credentials = new NetworkCredential(_remoteUser, _remotePass); 
FtpWebResponse response = (FtpWebResponse)request.GetResponse(); 
Stream responseStream = response.GetResponseStream(); 

// Copy the data from the responseStream to destination 1k at a time (feel free to increase buffer size) 
byte[] buffer = new byte[1024]; 
for (int amountRead = responseStream.Read(buffer, 0, buffer.Length); amountRead > 0; amountRead = responseStream.Read(buffer, 0, buffer.Length)) 
{ 
    destination.Write(buffer, 0, amountRead); 
} 
destination.Flush(); 

response.Close(); 

Answer 2

我认为你的问题是，你下载的压缩方式，这里有一篇文章，解释如何使用它，我希望它能帮助：

http://www.vcskicks.com/download-file-ftp.php

此外，再是这样在这里一个问题：

how to download compressed file (.zip) through FTP using c#?

Answer 3

下面是从FTP服务器下载文件，示例代码

Uri url = new Uri("ftp://ftp.demo.com/file1.txt"); 
if (url.Scheme == Uri.UriSchemeFtp) 
{ 
    FtpWebRequest objRequest = (FtpWebRequest)FtpWebRequest.Create(url); 
    //Set credentials if required else comment this Credential code 
    NetworkCredential objCredential = new NetworkCredential("FTPUserName", "FTPPassword"); 
    objRequest.Credentials = objCredential; 
    objRequest.Method = WebRequestMethods.Ftp.DownloadFile; 
    FtpWebResponse objResponse = (FtpWebResponse)objRequest.GetResponse(); 
    StreamReader objReader = new StreamReader(objResponse.GetResponseStream()); 
    byte[] buffer = new byte[16 * 1024]; 
    int len = 0; 
    FileStream objFS = new FileStream(Server.MapPath("file1.txt"), FileMode.Create, FileAccess.Write, FileShare.Read); 
    while ((len = objReader.BaseStream.Read(buffer, 0, buffer.Length)) != 0) 
    { 
     objFS.Write(buffer, 0, len); 
    } 
    objFS.Close(); 
    objResponse.Close(); 
}