本文主要是介绍j2me如何上传文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
在nokia的论坛里看到，感觉很详细，在此分享。
Here is a J2ME class to handle file uploads via HTTP POST Multipart Requests.
Source Code: HttpMultipartRequest class
import
java.io.ByteArrayOutputStream
;
import
java.io.InputStream
;
import
java.io.OutputStream
;
import
java.util.Enumeration
;
import
java.util.Hashtable
;
import
javax.microedition.io.Connector
;
import
javax.microedition.io.HttpConnection
;
public
class
HttpMultipartRequest
{
static
final
String
BOUNDARY =
"----------V2ymHFg03ehbqgZCaKO6jy"
;
byte
[
]
postBytes =
null
;
String
url =
null
;
public
HttpMultipartRequest(
String
url, Hashtable
params, String
fileField, String
fileName, String
fileType, byte
[
]
fileBytes)
throws
Exception
{
this
.url
=
url;
String
boundary =
getBoundaryString(
)
;
String
boundaryMessage =
getBoundaryMessage(
boundary, params, fileField, fileName, fileType)
;
String
endBoundary =
"/r
/n
--"
+
boundary +
"--/r
/n
"
;
ByteArrayOutputStream
bos =
new
ByteArrayOutputStream
(
)
;
bos.write
(
boundaryMessage.getBytes
(
)
)
;
bos.write
(
fileBytes)
;
bos.write
(
endBoundary.getBytes
(
)
)
;
this
.postBytes
=
bos.toByteArray
(
)
;
bos.close
(
)
;
}
String
getBoundaryString(
)
{
return
BOUNDARY;
}
String
getBoundaryMessage(
String
boundary, Hashtable
params, String
fileField, String
fileName, String
fileType)
{
StringBuffer
res =
new
StringBuffer
(
"--"
)
.append
(
boundary)
.append
(
"/r
/n
"
)
;
Enumeration
keys =
params.keys
(
)
;
while
(
keys.hasMoreElements
(
)
)
{
String
key =
(
String
)
keys.nextElement
(
)
;
String
value =
(
String
)
params.get
(
key)
;
res.append
(
"Content-Disposition: form-data; name=/"
"
)
.append
(
key)
.append
(
"/"
/r
/n
"
)
.append
(
"/r
/n
"
)
.append
(
value)
.append
(
"/r
/n
"
)
.append
(
"--"
)
.append
(
boundary)
.append
(
"/r
/n
"
)
;
}
res.append
(
"Content-Disposition: form-data; name=/"
"
)
.append
(
fileField)
.append
(
"/"
; filename=/"
"
)
.append
(
fileName)
.append
(
"/"
/r
/n
"
)
.append
(
"Content-Type: "
)
.append
(
fileType)
.append
(
"/r
/n
/r
/n
"
)
;
return
res.toString
(
)
;
}
public
byte
[
]
send(
)
throws
Exception
{
HttpConnection hc =
null
;
InputStream
is =
null
;
ByteArrayOutputStream
bos =
new
ByteArrayOutputStream
(
)
;
byte
[
]
res =
null
;
try
{
hc =
(
HttpConnection)
Connector.open
(
url)
;
hc.setRequestProperty
(
"Content-Type"
, "multipart/form-data; boundary="
+
getBoundaryString(
)
)
;
hc.setRequestMethod
(
HttpConnection.POST
)
;
OutputStream
dout =
hc.openOutputStream
(
)
;
dout.write
(
postBytes)
;
dout.close
(
)
;
int
ch;
is =
hc.openInputStream
(
)
;
while
(
(
ch =
is.read
(
)
)
!=
-
1)
{
bos.write
(
ch)
;
}
res =
bos.toByteArray
(
)
;
}
catch
(
Exception
e)
{
e.printStackTrace
(
)
;
}
finally
{
try
{
if
(
bos !=
null
)
bos.close
(
)
;
if
(
is !=
null
)
is.close
(
)
;
if
(
hc !=
null
)
hc.close
(
)
;
}
catch
(
Exception
e2)
{
e2.printStackTrace
(
)
;
}
}
return
res;
}
}
Sample usage
Here's a code snippet to upload a file via HttpMultipartRequest class:
byte
[
]
fileBytes =
getFileBytes(
)
;
//retrieve file bytes with your own code
Hashtable
params =
new
Hashtable
(
)
;
params.put
(
"custom_param"
, "param_value"
)
;
params.put
(
"custom_param2"
, "param_value2"
)
;
HttpMultipartRequest req =
new
HttpMultipartRequest(
"http://www.server.com/uploadScript.php"
,
params,
"upload_field"
, "original_filename.png"
, "image/png"
, fileBytes
)
;
byte
[
]
response =
req.send
(
)
;
Sample server code (PHP)
This is a sample PHP script that handles the upload. It doesn't actually save the uploaded file, but only displays some infos about the upload size and parameters.
<?php
$filesize
=
filesize
(
$_FILES
[
'upload_field'
]
[
'tmp_name'
]
)
;
echo
"The uploaded file size is "
.
$filesize
.
" bytes/n
"
;
foreach
(
$_POST
as
$key
=>
$value
)
{
echo
"Parameter name: "
.
$key
.
", value: "
.
$value
.
"/n
"
;
}
?>
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