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我只是照搬過來的，我也是剛找到。我自己還沒看明白源碼呢。：） 
你只有自己修改了。我把整個(gè)網(wǎng)頁一起貼過來吧。誰英文好翻譯一下。 
一頁貼不下，分兩頁。 
Upload Form 
Usually, you use an HTML FORM to submit data from the browser to the web server. That form can contain text fields, checkbox, button and also a file type control to upload files. The user fills in the form with his data and submits the form to the server. 
 
The enctype attribute of the <FORM> element specifies the content type used to encode the form data set for submission to the server. The enctype attribute used by default is " application/x-www-form-urlencoded ". However, that enctype is inefficient for sending large quantities of text, text containing non-ASCII characters or binary data to the server. The content type " multipart/form-data " should be used to submit forms in case of file uploading. Actually, it can be used to submit files and binary data. 
 
A " multipart/form-data " message contains a series of parts, where each part is expected to contain: 
 
a Content-Disposition header whose value is " form-data " 
a name attribute specifying the control name. 
For a file type control, the part contains some more information: 
 
a filename attribute specifying the original path and file name on the client 
a Content-Type header of the binary data control sent. 
Those headers are followed by the binary or text content of the control. 
 
The following example illustrates " multipart/form-data " encoding. The client would have this form in the browser: 
 
<FORM METHOD="POST" ENCTYPE="multipart/form-data" ACTION="upload.asp"> 
<INPUT TYPE="Text" NAME="email" VALUE="PhCollignon@email.com"> 
<INPUT TYPE="file" NAME="blob"> 
<INPUT TYPE="submit" NAME="Enter"> 
</FORM> 
 
 
 
If this form is submitted, the following request can be read on the server: 
 
-----------------------------7cf87224d2020a 
Content-Disposition: form-data; name="email" 
 
PhCollignon@email.com 
-----------------------------7cf87224d2020a 
Content-Disposition: form-data; name="blob"; filename="c:\image.gif" 
Content-Type: image/pjpeg 
 
ÿØÿàJFIFHHÿÛC… 
…ÿÙ 
-----------------------------7cf87224d2020a 
Content-Disposition: form-data; name="Enter" 
 
Submit Query 
-----------------------------7cf87224d2020a-- 
 
That content can be displayed if it is sent back as a response to the client. The binary data should be read and written with Request.binaryRead and Response.binaryWrite methods. 
 
<% 
Response.BinaryWrite(Request.BinaryRead(Request.TotalBytes)) 
%> 
 
You can see that parts of the response are delimited by boundaries: 
 
-----------------------------7cf87224d2020a 
 
and the last boundary is followed by: ' -- ' 
 
 
There is one Content-Disposition for each control. The name attribute identifies the control sent by the HTML form (email, blob and Enter). For a file type control (blob), the file name is also part of Content-Disposition header and, a Content-Type header gives the content type of the binary data.

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