ASP.Net如何把文件从一台服务器上传到另外一台服务器

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假设A是web服务器，B是资源服务器，文件要通过A服务器上的web程序上传到B服务器。

步骤如下：

1、在B服务器上面新建并共享一个文件夹，比如D:\UploadFiles。在IIS下新建一个虚拟目录UploadFiles，指向D:\UploadFiles。

2、在B服务器上新建一个用户，比如：用户名是chenya，密码是123456。

3、将用户chenya添加到UploadFiles的权限组里去，并且选择“完全控制”。如果不行，看看是不是ASP.NET和Users没有加。值得注意的是，我们还需要在服务器A上同样的加上chenya用户,密码也要一样，这是在后面代码里用来登录映射驱动器的。

4、如果Administrator是空密码，那么所有的用户都可以访问该目录了，这肯定是不被允许的。所以一定要为Administrator设置一个密码，并且确保使用服务器B时必须输入用户名和密码(在运行里输入control userpasswords2)，当然，作为服务器B而言，管理员用户是必须要设置密码的，不管我们要不要上传东西。这样的话，每当匿名用户访问时都需要输入授权的用户名和密码，这时chenya用户就派上用场了。

5、最后，我们需要把服务器B上的UploadFiles映射成服务器A的网络驱动器，这样服务器A就可以像访问自己本地的硬盘一样访问UploadFiles了，就是在上传的cs文件里引入以下代码：

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public const int LOGON32_LOGON_INTERACTIVE = 2;
public const int LOGON32_PROVIDER_DEFAULT = 0;
System.Security.Principal.WindowsImpersonationContext impersonationContext;

[DllImport("advapi32.dll", CharSet = CharSet.Auto)]
public static extern int LogonUser(String lpszUserName,
String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public extern static int DuplicateToken(IntPtr hToken,
int impersonationLevel,
ref IntPtr hNewToken);

private bool impersonateValidUser(String userName, String domain, String password)
{
    IntPtr token = IntPtr.Zero;
    IntPtr tokenDuplicate = IntPtr.Zero;

    if (LogonUser(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
    LOGON32_PROVIDER_DEFAULT, ref token) != 0)
    {
        if (DuplicateToken(token, 2, ref tokenDuplicate) != 0)
        {
            System.Security.Principal.WindowsIdentity tempWindowsIdentity;
            tempWindowsIdentity = new System.Security.Principal.WindowsIdentity(tokenDuplicate);
            impersonationContext = tempWindowsIdentity.Impersonate();
            if (impersonationContext != null)
                return true;
            else
                return false;
        }
        else
            return false;
    }
    else
        return false;
}
private void undoImpersonation()
{
    impersonationContext.Undo();//回退为未更改前账户
}

//开始上传
protected void UploadFile()
{
    string m_path = @"http://www.cnblogs.com/ghfsusan/admin/file://192.168.1.100/UploadFiles";
    m_path = Path.Combine(m_path, "demo");

    //临时更改为跟网络硬盘相同用户名密码的账户（此账户必须在网络盘有写入权限）本机也需要同样帐号密码的帐户
    if (impersonateValidUser("chenya", "192.168.1.100", "123456"))
    {
        //登陆后处理密码
        if (!Directory.Exists(m_path))
        {
            try
            {
                Directory.CreateDirectory(m_path);
                Directory.CreateDirectory(Path.Combine(m_path, "Video"));
                Directory.CreateDirectory(Path.Combine(m_path, "Html"));
                Directory.CreateDirectory(Path.Combine(m_path, "Doc"));
            }
            catch (Exception e)
            {
                Response.Write(e.Message);
            }
            FileUpload1.SaveAs(@"http://www.cnblogs.com/ghfsusan/admin/file://192.168.1.100/UploadFiles/demo/newfile.rar");
            undoImpersonation();//回退为未更改前账户
        }
}
public const int LOGON32_LOGON_INTERACTIVE = 2;
public const int LOGON32_PROVIDER_DEFAULT = 0;
System.Security.Principal.WindowsImpersonationContext impersonationContext;

[DllImport("advapi32.dll", CharSet = CharSet.Auto)]
public static extern int LogonUser(String lpszUserName,
String lpszDomain,
String lpszPassword,
int dwLogonType,
int dwLogonProvider,
ref IntPtr phToken);
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public extern static int DuplicateToken(IntPtr hToken,
int impersonationLevel,
ref IntPtr hNewToken);

private bool impersonateValidUser(String userName, String domain, String password)
{
IntPtr token = IntPtr.Zero;
IntPtr tokenDuplicate = IntPtr.Zero;

    if (LogonUser(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
    LOGON32_PROVIDER_DEFAULT, ref token) != 0)
    {
        if (DuplicateToken(token, 2, ref tokenDuplicate) != 0)
        {
            System.Security.Principal.WindowsIdentity tempWindowsIdentity;
            tempWindowsIdentity = new System.Security.Principal.WindowsIdentity(tokenDuplicate);
            impersonationContext = tempWindowsIdentity.Impersonate();
            if (impersonationContext != null)
                return true;
            else
                return false;
        }
        else
            return false;
    }
    else
        return false;
}
private void undoImpersonation()
{
    impersonationContext.Undo();//回退为未更改前账户
}

//开始上传
protected void UploadFile()
{
string m_path = @"http://www.cnblogs.com/ghfsusan/admin/file://192.168.1.100/UploadFiles";
m_path = Path.Combine(m_path, "demo");

    //临时更改为跟网络硬盘相同用户名密码的账户（此账户必须在网络盘有写入权限）本机也需要同样帐号密码的帐户
    if (impersonateValidUser("chenya", "192.168.1.100", "123456"))
    {
        //登陆后处理密码
        if (!Directory.Exists(m_path))
        {
            try
            {
                Directory.CreateDirectory(m_path);
                Directory.CreateDirectory(Path.Combine(m_path, "Video"));
                Directory.CreateDirectory(Path.Combine(m_path, "Html"));
                Directory.CreateDirectory(Path.Combine(m_path, "Doc"));
            }
            catch (Exception e)
            {
                Response.Write(e.Message);
            }
            FileUpload1.SaveAs(@"http://www.cnblogs.com/ghfsusan/admin/file://192.168.1.100/UploadFiles/demo/newfile.rar");
            undoImpersonation();//回退为未更改前账户
        }
}