也许很多朋友在做WEB项目的时候都会碰到这样一个需求：
当用户上传文件时，需要将上传的文件保存到另外一台专门的文件服务器。
要实现这样一个功能，有两种解决方案：
方案一、在文件服务器上新建一站点，用来接收上传的文件，然后保存。
方案二、将文件服务器的指定目录共享给WEB服务器，用来保存文件。
方案一不用多说，应该是很简单的了，将上传文件的FORM表单的ACTION属性指向文件服务器上的站点即可，我们来重点说下方案二。
也许你会说，其实方案二也很简单，在WEB服务器上做下磁盘映射，然后直接访问不就行了。其实不是这样的，IIS默认账户为NETWORK_SERVICE，该账户是没权限访问共享目录的，所以当你把站点部署到IIS上的时候，再访问映射磁盘就会报“找不到路径”的错误。所以，直接创建磁盘映射是行不通的，我们需要在程序中用指定账户创建映射，并用该账户运行IIS进程，下面来说下详细步骤及相关代码。
1、在文件服务器上创建共享目录，并新建访问账户。
比如共享目录为：\\192.168.0.9\share
访问账户为：user-1 密码为：123456
2、在WEB服务器上新建用户：user-1 密码为：123456，用户组选择默认的user组即可。
3、在WEB项目中新建公共类WNetHelper
using System.Runtime.InteropServices;
public class WNetHelper
{
[DllImport("mpr.dll", EntryPoint = "WNetAddConnection2")]
private static extern uint WNetAddConnection2(NetResource lpNetResource, string lpPassword, string lpUsername, uint dwFlags);
[DllImport("Mpr.dll", EntryPoint = "WNetCancelConnection2")]
private static extern uint WNetCancelConnection2(string lpName, uint dwFlags, bool fForce);
[StructLayout(LayoutKind.Sequential)]
public class NetResource
{
public int dwScope;
public int dwType;
public int dwDisplayType;
public int dwUsage;
public string lpLocalName;
public string lpRemoteName;
public string lpComment;
public string lpProvider;
}
/// <summary>
/// 为网络共享做本地映射
/// </summary>
/// <param name="username">访问用户名（windows系统需要加计算机名，如：comp-1\user-1）</param>
/// <param name="password">访问用户密码</param>
/// <param name="remoteName">网络共享路径（如：\\192.168.0.9\share）</param>
/// <param name="localName">本地映射盘符</param>
/// <returns></returns>
public static uint WNetAddConnection(string username, string password, string remoteName, string localName)
{
NetResource netResource = new NetResource();
netResource.dwScope = 2;
netResource.dwType = 1;
netResource.dwDisplayType = 3;
netResource.dwUsage = 1;
netResource.lpLocalName = localName;
netResource.lpRemoteName = remoteName.TrimEnd('\\');
uint result = WNetAddConnection2(netResource, password, username, 0);
return result;
}
public static uint WNetCancelConnection(string name, uint flags, bool force)
{
uint nret = WNetCancelConnection2(name, flags, force);
return nret;
}
}
4、为IIS指定运行账户user-1
要实现此功能，有两种办法：
a) 在web.config文件中的<system.web>节点下，添加如下配置：<identity impersonate="true" userName="user-1" password="123456" />
b) 在WEB项目中添加公用类LogonImpersonate
public class LogonImpersonate : IDisposable
{
static public string DefaultDomain
{
get
{
return ".";
}
}
const int LOGON32_LOGON_INTERACTIVE = 2;
const int LOGON32_PROVIDER_DEFAULT = 0;
[System.Runtime.InteropServices.DllImport("Kernel32.dll")]
extern static int FormatMessage(int flag, ref IntPtr source, int msgid, int langid, ref string buf, int size, ref IntPtr args);
[System.Runtime.InteropServices.DllImport("Kernel32.dll")]
extern static bool CloseHandle(IntPtr handle);
[System.Runtime.InteropServices.DllImport("Advapi32.dll", SetLastError = true)]
extern static bool LogonUser(
string lpszUsername,
string lpszDomain,
string lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken
);
IntPtr token;
System.Security.Principal.WindowsImpersonationContext context;
public LogonImpersonate(string username, string password)
{
if (username.IndexOf("\\") == -1)
{
Init(username, password, DefaultDomain);
}
else
{
string[] pair = username.Split(new char[] { '\\' }, 2);
Init(pair[1], password, pair[0]);
}
}
public LogonImpersonate(string username, string password, string domain)
{
Init(username, password, domain);
}
void Init(string username, string password, string domain)
{
if (LogonUser(username, domain, password, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, ref token))
{
bool error = true;
try
{
context = System.Security.Principal.WindowsIdentity.Impersonate(token);
error = false;
}
finally
{
if (error)
CloseHandle(token);
}
}
else
{
int err = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
IntPtr tempptr = IntPtr.Zero;
string msg = null;
FormatMessage(0x1300, ref tempptr, err, 0, ref msg, 255, ref tempptr);
throw (new Exception(msg));
}
}
~LogonImpersonate()
{
Dispose();
}
public void Dispose()
{
if (context != null)
{
try
{
context.Undo();
}
finally
{
CloseHandle(token);
context = null;
}
}
}
}
在访问映射磁盘之前首先调用此类为IIS更换运行用户：LogonImpersonate imper = new LogonImpersonate("user-1", "123456");
5、在访问共享目录前，调用WNetHelper.WNetAddConnection，添加磁盘映射
public static bool CreateDirectory(string path)
{
uint state = 0;
if (!Directory.Exists("Z:"))
{
state = WNetHelper.WNetAddConnection(@"comp-1\user-1", "123456", @"\\192.168.0.9\share", "Z:");
}
if (state.Equals(0))
{
Directory.CreateDirectory(path);
return true;
}
else
{
throw new Exception("添加网络驱动器错误，错误号：" + state.ToString());
}
}
6、完成。
简洁代码就是：
LogonImpersonate imper = new LogonImpersonate("user-1", "123456");
WNetHelper.WNetAddConnection(@"comp-1\user-1", "123456", @"\\192.168.0.9\share", "Z:");
Directory.CreateDirectory(@"Z:\newfolder");
file1.SaveAs(@"Z:\newfolder\test.jpg");
另一种方法：
<add key="command1" value="net use h: \\IP\share <PWD>;/user:<userName>;"/>
<add key="command2" value="copy d:\11.txt H:\"/>
<add key="command3" value="net use h: /delete /y"/>
public int FileCopy()
{
string command1 = string.Empty, command2 = string.Empty, command3 = string.Empty ;
string error = string.Empty;
Process process = new Process();
try
{
command1 = @System.Configuration.ConfigurationManager.AppSettings["command1"];
command2 = @System.Configuration.ConfigurationManager.AppSettings["command2"];
command3 = @System.Configuration.ConfigurationManager.AppSettings["command3"];
process.StartInfo.FileName = "cmd.exe";
process.StartInfo.Arguments = "/c " + command1;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.UseShellExecute = false;
process.Start();
System.Diagnostics.Debug.WriteLine(process.StartInfo.FileName + " " + process.StartInfo.Arguments);
process.WaitForExit();
System.Diagnostics.Debug.WriteLine("Start Copy File.....");
process.StartInfo.Arguments = "/c " +command2;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.UseShellExecute = false;
process.Start();
process.WaitForExit();
System.Diagnostics.Debug.WriteLine("End Copy File.....");
process.StartInfo.Arguments = "/c " +command3;
process.Start();
process.Close();
}
catch (IOException ex)
{
error += ex.Message;
System.Diagnostics.Debug.WriteLine("in FileCopy IOException:" + ex.Message);
return -1;
}
catch (Exception ex)
{
error += ex.Message;
System.Diagnostics.Debug.WriteLine("in FileCopy Exception:" + ex.Message);
return -1;
}
finally
{
process.Dispose();
}
return 0;
}
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