ASP.NET访问网络驱动器（映射磁盘）

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;
        }