由於項目使用了負載，所以有這樣的需求，需要把文件保存到同一個服務器下，然後去指定的服務器讀取文件。
我經過了一些搜索，找到了2個辦法來實現。一種是使用共享文件夾的方式，還有一種是使用FTP協議去傳輸文件。
下面先記錄下使用共享文件夾的方式。
首先，在指定服務器下，創建共享文件，名稱爲Share，把它共享給所有人，讀寫權限。
然後，代碼如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Diagnostics;
namespace MB.Cloud.PosService.ServerBiz.Basic.Base
{
public class ShareFileHelper
{
public void Execute()
{
bool status = false;
//連接共享文件夾
status = connectState(@"\\10.100.20.122\Share", "用戶名", "密碼");
if (status)
{
//共享文件夾的目錄
DirectoryInfo theFolder = new DirectoryInfo(@"\\10.100.20.122\Share");
//相對共享文件夾的路徑
string fielpath = @"\123\456\";
//獲取保存文件的路徑
string filename = theFolder.ToString() + fielpath + "1.jpg";
string filePath = @"C:\Users\hq01ub721\Desktop\臨時\";
//執行方法
Transport(filename, filePath, "3.jpg"); //這是從共享文件夾讀取文件到本地
}
else
{
//ListBox1.Items.Add("未能連接！");
}
Console.ReadKey();
}
public static bool connectState(string path)
{
return connectState(path, "", "");
}
/// <summary>
/// 連接遠程共享文件夾
/// </summary>
/// <param name="path">遠程共享文件夾的路徑</param>
/// <param name="userName">用戶名</param>
/// <param name="passWord">密碼</param>
/// <returns></returns>
public static bool connectState(string path, string userName, string passWord)
{
bool Flag = false;
Process proc = new Process();
try
{
proc.StartInfo.FileName = "cmd.exe";
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.RedirectStandardInput = true;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.RedirectStandardError = true;
proc.StartInfo.CreateNoWindow = true;
proc.Start();
string dosLine = "net use " + path + " " + passWord + " /user:" + userName;
proc.StandardInput.WriteLine(dosLine);
proc.StandardInput.WriteLine("exit");
while (!proc.HasExited)
{
proc.WaitForExit(1000);
}
string errormsg = proc.StandardError.ReadToEnd();
proc.StandardError.Close();
if (string.IsNullOrEmpty(errormsg))
{
Flag = true;
}
else
{
throw new Exception(errormsg);
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
proc.Close();
proc.Dispose();
}
return Flag;
}
/// <summary>
/// 向遠程文件夾保存本地內容，或者從遠程文件夾下載文件到本地
/// </summary>
/// <param name="src">要保存的文件的路徑，如果保存文件到共享文件夾，這個路徑就是本地文件路徑如：@"D:\1.avi"</param>
/// <param name="dst">保存文件的路徑，不含名稱及擴展名</param>
/// <param name="fileName">保存文件的名稱以及擴展名</param>
public static void Transport(string src, string dst, string fileName)
{
FileStream inFileStream = new FileStream(src, FileMode.Open);
if (!Directory.Exists(dst))
{
Directory.CreateDirectory(dst);
}
dst = dst + fileName;
FileStream outFileStream = new FileStream(dst, FileMode.OpenOrCreate);
byte[] buf = new byte[inFileStream.Length];
int byteCount;
while ((byteCount = inFileStream.Read(buf, 0, buf.Length)) > 0)
{
outFileStream.Write(buf, 0, byteCount);
}
inFileStream.Flush();
inFileStream.Close();
outFileStream.Flush();
outFileStream.Close();
}
}
}
首先在服務器端建立FTP站點，然後就可以通過代碼，或者瀏覽器訪問了。
代碼如下：
public class FtpHelper
{
private static string FtpAddress = "10.100.20.122:21";
private static string LocalPath = @"C:\Users\ShareFileDownload";
public static void DownLoadFile(string filename)
{
FtpWebRequest req = (FtpWebRequest)WebRequest.Create("ftp://" + FtpAddress + "/" + filename);
req.Method = WebRequestMethods.Ftp.DownloadFile;
req.UseBinary = true;
req.UsePassive = true;
req.Credentials = new NetworkCredential(@"POSTEST-1203\Administrator", "pos123");
try
{
using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
{
string localfile = Path.Combine(LocalPath, filename);
FileStream fs = new FileStream(localfile, FileMode.Create, FileAccess.Write);
int buffer = 1024; //1K緩衝
byte[] b = new byte[buffer];
int i = 0;
Stream stream = res.GetResponseStream();
while ((i = stream.Read(b, 0, buffer)) > 0)
{
fs.Write(b, 0, i);
}
}
Console.WriteLine(filename + " download!");
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
finally
{
}
}
/// <summary>
/// 獲取FTP文件列表
/// </summary>
/// <returns></returns>
public static List<String> GetFileList()
{
List<string> list = new List<string>();
FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri("ftp://" + FtpAddress + ""));
//req.Credentials = new NetworkCredential(FtpUid, FtpPwd);
req.Method = WebRequestMethods.Ftp.ListDirectory;
req.UseBinary = true;
req.UsePassive = true;
try
{
using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
{
using (StreamReader sr = new StreamReader(res.GetResponseStream()))
{
string s;
while ((s = sr.ReadLine()) != null)
{
list.Add(s);
}
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
return list;
}
public static void UploadFile(string localFile)
{
FileInfo fi = new FileInfo(localFile);
FileStream fs = fi.OpenRead();
long length = fs.Length;
FtpWebRequest req = (FtpWebRequest)WebRequest.Create("ftp://" + FtpAddress + "/123/" + fi.Name);
// req.Credentials = new NetworkCredential(FtpUid, FtpPwd);
req.Method = WebRequestMethods.Ftp.UploadFile;
req.UseBinary = true;
req.ContentLength = length;
req.Timeout = 10 * 1000;
try
{
Stream stream = req.GetRequestStream();
int BufferLength = 2048; //2K
byte[] b = new byte[BufferLength];
int i;
while ((i = fs.Read(b, 0, BufferLength)) > 0)
{
stream.Write(b, 0, i);
}
stream.Close();
stream.Dispose();
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
}