下载（二）客户端通过C# 代码直接从服务器下载文件到本地

局域网文件下载：

public class RemoteDownload

{

public static void DownLoad(string addressUrl,string localName)

{

//下载文件

System.Net.WebClient myWebClient = new System.Net.WebClient();

myWebClient.DownloadFile(@"/10.2.0.254/software/01279.lic.txt", "testdownload.txt");

//下载end

}

}

通过ＵＲＬ获取页面内容

try

{

// 远程获取目标页面源码

string strTargetHtml = string.Empty;

WebClient wc = new WebClient();

wc.Credentials = CredentialCache.DefaultCredentials;

byte[] btPageData = wc.DownloadData(strTargetUrl + dtTargetDate.ToString("yyyy") + "/" + dtTargetDate.ToString("MM") + "/" + dtTargetDate.ToString("dd") + "/");

strTargetHtml = Encoding.UTF8.GetString(btPageData);

wc.Dispose();

}

catch(Exception exp)

{

_isError = true;

_errorDetail = "获取目标日志文件列表时出错：" + exp.Message;

}

通过web方式，从远程服务器端下载文件：

public class WebDownload

{

public static void DownLoad(string Url, string FileName)

{

bool Value = false;

WebResponse response = null;

Stream stream = null;

try

{

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

response = request.GetResponse();

stream = response.GetResponseStream();

if (!response.ContentType.ToLower().StartsWith("text/"))

{

Value = SaveBinaryFile(response, FileName);

}

}

catch (Exception err)

{

string aa = err.ToString();

}

}

/// <summary>

/// Save a binary file to disk.

/// </summary>

/// <param name="response">The response used to save the file</param>

// 将二进制文件保存到磁盘

private static bool SaveBinaryFile(WebResponse response, string FileName)

{

bool Value = true;

byte[] buffer = new byte[1024];

try

{

if (File.Exists(FileName))

File.Delete(FileName);

Stream outStream = System.IO.File.Create(FileName);

Stream inStream = response.GetResponseStream();

int l;

do

{

l = inStream.Read(buffer, 0, buffer.Length);

if (l > 0)

outStream.Write(buffer, 0, l);

}

while (l > 0);

outStream.Close();

inStream.Close();

}

catch

{

Value = false;

}

return Value;

}

从FTP上下载文件：

public class FtpDownload

{

public static void DownLoad(string FtpPath)

{

/*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();

}

}

}