Chapter 8. Uploading Files
Web sites use the
form tag to
users to submit files from their own
filesystem for processing on the server.
form tag enables the
uploading action with a nested
element that has a
type attribute set to “file”.
input tag is specified using
the syntax described in Recipe 8.1.
request for file uploading uses a
type of "multipart/form-data”.
The HTTP message that the user sends to
the server by clicking the web page’s
Submit button contains descriptive
headers and the body of each uploaded
file. Each of the uploaded files is
separated by a specified boundary
pattern (see the
header value in Example 8-1).
Example 8-1 shows
an abbreviated view of a
“multipart/form-data” type request
including the uploading of three very
small files. To make this example more
compact, I have removed some of the
values from the
POST /home/upload.jsp HTTP/1.1 Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg ... Referer: http://localhost:8080/home/interact.html Accept-Language: en-us Content-Type: multipart/form-data; boundary=---------------------------7d33c11c6018e Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 4.0) Host: localhost:9000 Content-Length: 541 Connection: Keep-Alive Cache-Control: no-cache Cookie: JSESSIONID=7F6154184FFF3D1AE345E1F2FFF1A22E -----------------------------7d33c11c6018e ...