C#本地文件下載以及FTP文件服務下載（以Pdf文件爲例）
1、C#實現本地文件下載函數
一、文件下載的路徑 文件名稱 以及文件下載以後要放的位置 這三個變量是必需要的spa
二、定義如下四個對象：日誌
FileWebRequest ftpWebRequest = null;
FileWebResponse ftpWebResponse = null;
Stream ftpResponseStream = null;
FileStream outputStream = null;對象
三、建立文件下載存放位置的路徑（不須要手動建立，若是路徑存在就建立 不存在就不建立）字符串
Directory.CreateDirectory(LocalFolder);//建立文件夾名稱get
* 這裏提一點 Path.Combine（）這個就是文件路徑拼接的函數，會自動判斷，在須要的文件加 \\ string
好比 string filePath= Path.Combine（「D:」，「test」,"download"）; // filePath="D:\\test\download";it
四、 而後執行如下代碼 便可完成文件下載io
ftpWebRequest = (FileWebRequest)FileWebRequest.Create(new Uri(uri));
ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
ftpWebResponse = (FileWebResponse)ftpWebRequest.GetResponse();
ftpResponseStream = ftpWebResponse.GetResponseStream();
long contentLength = ftpWebResponse.ContentLength;
int bufferSize = 2048;
byte[] buffer = new byte[bufferSize];
int readCount;
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
}class
五、代碼寫完以後要思考，下載文件的時候如何出現異常 這時在整個代碼加個 Try{} catch{}
具體代碼以下：
public static void Main(string[] args)
{
TestFile tf = new TestFile();
tf.fileDownload("D:/testFile/", "下載ftp文件.txt", "C:/Users/17/Desktop/文件", "下載ftp文件.txt", DateTime.Now.ToShortDateString());
}
/// <summary>
/// 下載文件
/// </summary>
/// <param name="localPath">本地文件地址(沒有文件名)</param>
/// <param name="localFileName">本地文件名</param>
/// <param name="ftpPath">下載的ftp的路徑</param>
/// <param name="ftpFileName">下載的ftp的文件名</param>
public bool fileDownload(string localPath, string localFileName, string ftpPath, string ftpFileName, string date)
{
bool success = false;
//FtpWebResponse ftpWebResponse = null;
FileWebRequest ftpWebRequest = null;
FileWebResponse ftpWebResponse = null;
Stream ftpResponseStream = null;
FileStream outputStream = null;
try
{
//string date = DateTime.Now.ToShortDateString().ToString();//獲取系統時間
string date1 = date.Replace("/", "");//winods 中文件命名不能有 / 去掉指定字符串 /
//localPath = localPath + date1 + "/";//拼接路徑
localPath=Path.Combine(localPath,date1)
Directory.CreateDirectory(localPath);//建立文件夾名稱
outputStream = new FileStream(localPath + localFileName, FileMode.Create);//建立文件
string uri = ftpRootURL + ftpPath + "/" + ftpFileName;//拼接目標文件路徑
string uri= Path.Combine(ftpRootURL,ftpPath,ftpFileName);
ftpWebRequest = (FileWebRequest)FileWebRequest.Create(new Uri(uri));
//ftpWebRequest1.UseBinary = true;
ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
ftpWebResponse = (FileWebResponse)ftpWebRequest.GetResponse();
ftpResponseStream = ftpWebResponse.GetResponseStream();
long contentLength = ftpWebResponse.ContentLength;
int bufferSize = 2048;
byte[] buffer = new byte[bufferSize];
int readCount;
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
}
success = true;
}
catch (Exception e)
{
DirectoryInfo folder = new DirectoryInfo(localPath);
StreamWriter log = new StreamWriter(localPath + "/" + DateTime.Now.ToShortDateString().ToString().Replace("/", "") + ".txt", true);
log.WriteLine("發生異常時間:" + System.DateTime.Now.ToShortTimeString().ToString());
log.WriteLine("發生異常信息:" + e.Message);
log.WriteLine("發送異常對象:" + e.Source);
log.WriteLine("調用堆棧:" + e.StackTrace.Trim());
log.WriteLine("觸動方法:" + e.TargetSite);
log.WriteLine(" " + e.HResult);
log.WriteLine("數據對象" + e.Data);
log.WriteLine("____________________________________________________________");
log.WriteLine();
log.Close();
success = false;
}
finally
{
if (outputStream != null)
{
outputStream.Close();
}
if (ftpResponseStream != null)
{
ftpResponseStream.Close();
}
if (ftpWebResponse != null)
{
ftpWebResponse.Close();
}
}
return success;
}
2、 FTP 服務文件下載
這個功能其實和本地文件下載同樣，只須要加幾點便可
一、FTP服務的地址；
具體代碼以下
private string ftpIP = "**********";
二、FTP文件服務的登陸帳號以及密碼
具體代碼以下
private string ftpName = "*********";
private string ftpPassword = "******";
private string ftpRootURL = string.Empty;
FtpWebRequest reqFTP;
三、獲取FTP服務上的文件名稱、FTP文件服務須要下載以後存放的路徑以及下載功能的實現
FtpWebRequest ftpWebRequest = null;
FtpWebResponse ftpWebResponse = null;
Stream ftpResponseStream = null;
FileStream outputStream = null;
try
{
localFilePath = Path.Combine(localFilePath, ftpFileNameTime);
Directory.CreateDirectory(localFilePath);//建立文件夾名稱
outputStream = new FileStream(Path.Combine(localFilePath, fileName), FileMode.Create);
string uri = Path.Combine(ftpRootURL, ftpIP, fileName);
ftpWebRequest = (FtpWebRequest)FileWebRequest.Create(new Uri(uri));
ftpWebRequest.Credentials = new NetworkCredential(ftpName, ftpPassword);//登陸ftp
ftpWebRequest.UseBinary = true;
ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
ftpResponseStream = ftpWebResponse.GetResponseStream();
long contentLength = ftpWebResponse.ContentLength;
int bufferSize = 2048;
byte[] buffer = new byte[bufferSize];
int readCount;
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message）
/*MessageBox.Show(ex.Message + "是否下載日誌文件", "發送錯誤！", MessageBoxButtons.OKCancel);
//點擊肯定 就執行下載日誌文件，否則就不執行
if (dr == DialogResult.OK)
{
WriteLog log = new WriteLog();
log.Write_log(ex.Message);
}*/
}
finally
{
if (outputStream != null)
{
outputStream.Close();
}
if (ftpResponseStream != null)
{
ftpResponseStream.Close();
}
if (ftpWebResponse != null)
{
ftpWebResponse.Close();
}
}
五、具體代碼以下：
namespace FtpDownLoad
{
public class ftpFileDownload
{
private string ftpIP = "*************";
private string ftpName = "2*******";
private string ftpPassword = "*********";
private string ftpRootURL = string.Empty;
FtpWebRequest reqFTP;
public static void Main(string[] args)
{
ftpFileDownload ftpDown = new ftpFileDownload();
ftpDown.GetFileList("D:\testFile","37.pdt","20190703");
}
/// <summary>
/// 文件下載
/// </summary>
/// <param name="localFilePath">下載路徑</param>
/// <param name="fileName">下載的名稱</param>
/// <param name="ftpFilePath">FTP路徑</param>
/// <param name="ftpFileNameTime">FTP文件的修改時間</param>
public void FtpDownLoadFile(string localFilePath, string fileName, string ftpFileNameTime)
{
FtpWebRequest ftpWebRequest = null;
FtpWebResponse ftpWebResponse = null;
Stream ftpResponseStream = null;
FileStream outputStream = null;
try
{
localFilePath = Path.Combine(localFilePath, ftpFileNameTime);
Directory.CreateDirectory(localFilePath);//建立文件夾名稱
outputStream = new FileStream(Path.Combine(localFilePath, fileName), FileMode.Create);
string uri = Path.Combine(ftpRootURL, ftpIP, fileName);
ftpWebRequest = (FtpWebRequest)FileWebRequest.Create(new Uri(uri));
ftpWebRequest.Credentials = new NetworkCredential(ftpName, ftpPassword);//登陸ftp
ftpWebRequest.UseBinary = true;
ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
ftpWebResponse = (FtpWebResponse)ftpWebRequest.GetResponse();
ftpResponseStream = ftpWebResponse.GetResponseStream();
long contentLength = ftpWebResponse.ContentLength;
int bufferSize = 2048;
byte[] buffer = new byte[bufferSize];
int readCount;
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);
readCount = ftpResponseStream.Read(buffer, 0, bufferSize);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
/* DialogResult dr = MessageBox.Show(ex.Message + "是否下載日誌文件", "發送錯誤！", MessageBoxButtons.OKCancel);
//點擊肯定 就執行下載日誌文件，否則就不執行
if (dr == DialogResult.OK)
{
WriteLog log = new WriteLog();
log.Write_log(ex.Message);
}*/
}
finally
{
if (outputStream != null)
{
outputStream.Close();
}
if (ftpResponseStream != null)
{
ftpResponseStream.Close();
}
if (ftpWebResponse != null)
{
ftpWebResponse.Close();
}
}
}
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