Shweta
asked on
How to send a File, bundled in ValueObject, from Swing Client to EJB?
Hi Folks,
One suggestion/help reqrd .
My friend has a client/server architecture . Client is in Swings running in
windows and server is in EJB running in Unix .
He is making a session bean call from client to server .
Problem is he needs to send a file to server from client .
With the existing architecture he is sending all the information from clinet to
server after filling up a value object . (for Ex value object contains all
the attributes to be sent to server.).
Now he needs to send a file to server after bundling it into Value Object .
He tried sending a File object that does not work .
What is the way he sends a File to Server bundled in the ValueObject? Or should he follow some other method?
One suggestion/help reqrd .
My friend has a client/server architecture . Client is in Swings running in
windows and server is in EJB running in Unix .
He is making a session bean call from client to server .
Problem is he needs to send a file to server from client .
With the existing architecture he is sending all the information from clinet to
server after filling up a value object . (for Ex value object contains all
the attributes to be sent to server.).
Now he needs to send a file to server after bundling it into Value Object .
He tried sending a File object that does not work .
What is the way he sends a File to Server bundled in the ValueObject? Or should he follow some other method?
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CEHJ
Another way is to use a MDB send the file in pieces and then reassemble it
ASKER
Hi CEHJ,
In current architecture it's a Swing Client, sending the file to a Session EJB. The file will be of huge size as it contains millions of records in it... It's a good idea to divide the file and send.. but is it not difficult to use this approach with ValueObject? I mean how to send a file chunk object in Value Object ?
Thanks,
Shweta
In current architecture it's a Swing Client, sending the file to a Session EJB. The file will be of huge size as it contains millions of records in it... It's a good idea to divide the file and send.. but is it not difficult to use this approach with ValueObject? I mean how to send a file chunk object in Value Object ?
Thanks,
Shweta
>>I mean how to send a file chunk object in Value Object ?
This would simply be a wrapper of byte[]. You may need a chunk number as well
This would simply be a wrapper of byte[]. You may need a chunk number as well
How do you currently send the vo?
hi , if you send files as byte[] then there is a prob. byte[] can hold max of Integer.MAX_VALUE so if the file is large then we can not store it in a single byte[] .
>>if the file is large then we can not store it in a single byte[] .
Naturally i'm not suggesting sending the whole file in one array ;-)
Naturally i'm not suggesting sending the whole file in one array ;-)
ASKER
currently we are bundling all the infos to respective attributes and sending it to server by a session bean call. so if i add another attribute for file content in my VO and if i want to split it it is a problem. since my VO will be one nd my file contentattibute is inside my VO.
As already suggested add a byte[] instance variable and asign the bytes there. Then send the vo with the byte[] variable. Repeat more times if the byte array can't hold all the info of your value object. YOu will just need a few more trips to the server and back.
ASKER
ya, may be that is what I have to do . any other suggetions welcome.
Try to arrange things so that you're calling a method on your EJB that only sends the file bytes
You could always open a SocketChannel or a Socket and send the whole file (without wrapping it up in a vo) byte by byte or in a buffer. But this will require additional code in both the server and client side.
ASKER
yes i may have consider that option of sending byte[] in a batches. in this case one more thing i need to makesure is that i receive all the packets.. anyways i will consider this approach . all of you thanks for helping.
Please let us know how you are getting on :)
>>in this case one more thing i need to makesure is that i receive all the packets.. anyways i will consider this approach
That's why i suggested sending a packet number as well earlier:
>>You may need a chunk number as well
That's why i suggested sending a packet number as well earlier:
>>You may need a chunk number as well
ASKER
ok . will try that
you don't actually need a packet number, all the blocks will get delivered. You just need to include an indicator into your protocol to indicate the last block.
This is a multiple account problem, I guess - Shweta, raghava_dg.
https://www.experts-exchange.com/questions/21083663/sending-file-to-server.html
Shweta/ Raghava - whatever your name is - this is illegal as per the member agreement. Pls post back clarifying on this page if you're using two accounts or not, or I will tell the moderators.
https://www.experts-exchange.com/questions/21083663/sending-file-to-server.html
Shweta/ Raghava - whatever your name is - this is illegal as per the member agreement. Pls post back clarifying on this page if you're using two accounts or not, or I will tell the moderators.
ASKER
nop , my frnd asked this qtn to me . so i posted this qtn here . if u think logically there is no point in posting the same qtn to the group with 2 id's . coz the solutions given by the members will be same for both qtn .
I definitely see a logical point there - that is to use the points from both accounts - that is what some people do when they run out of question-points. The question which you've posted is exactly the same as the one posted by Raghava - word to word.
ASKER
did u noticed one more logical point? . if a person is using 2 accounts and if he posts same qtn frm 2 accounts he end up giving points in both accounts for same qtn. :)
Well, if you had understood what I meant - he gives points from 2 accounts, not from one. And that is not a loss. Anyway, I guess anyway will contact you.
>> anyway will contact you
*someone will contact you.
*someone will contact you.
That would not work because:
>> The file will be of huge size as it contains millions of records in it...
Accept his third comment:
"This would simply be a wrapper of byte[]. You may need a chunk number as well"
>> The file will be of huge size as it contains millions of records in it...
Accept his third comment:
"This would simply be a wrapper of byte[]. You may need a chunk number as well"
Ooh. The third comment was better.
Not really, a chunk number is unnecesary
Yeah, but the chunk number thing is just an idea in that comment as he uses 'you "may"'. Also:
>> This would simply be a wrapper of byte[]
Another one also says:
>> Naturally i'm not suggesting sending the whole file in one array ;-)
The first comment which was accepted definitely does not suit the situation because a mere byte[] array is not enough for this case, as mentioned by the asker ;-) so I thought accepting the other comment would be better.
>> This would simply be a wrapper of byte[]
Another one also says:
>> Naturally i'm not suggesting sending the whole file in one array ;-)
The first comment which was accepted definitely does not suit the situation because a mere byte[] array is not enough for this case, as mentioned by the asker ;-) so I thought accepting the other comment would be better.