How do I send and receive an integer array from client to server in Java socket programming?

Question

I'm having a problem sending a job (an integer array) from client to server in two different packages over a socket connection. Any ideas please?

I can explain further if my question is not clear enough.

Please post an example of the offending code. It will help tremendously in giving you guidance. — Rob Di Marco
– Rob Di Marco, Commented Mar 19, 2009 at 21:26
What do you mean by needing two different packages? Do you mean packets? If so, you should need to worry about the number or size of the packets. — Peter Lawrey
– Peter Lawrey, Commented Mar 19, 2009 at 22:01

David Z · Accepted Answer · 2009-03-19 21:29:03Z

4

To answer the question in your title, I would wrap the SocketOutputStream in a BufferedOutputStream in a DataOutputStream and use the latter's writeInt() method repeatedly. Or you could use ObjectOutputStream in place of DataOutputStream, and serialize the array: objOutStream.writeObject(theArray). To read it in again on the other end, just wrap the SocketInputStream in (1) a DataInputStream and use readInt() repeatedly, or (2) a ObjectInputStream and use readObject().

(If you don't have to interoperate with other languages, Object*Stream is easier on you)

answered Mar 19, 2009 at 21:29

David Z

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1 Comment

efe Over a year ago

Sorry could you be more technical by translating the answer you send into code or pseudocode please?

Björn · Accepted Answer · 2009-03-19 21:27:54Z

2

Do you have to send it as an array? It complicates the whole process. Why not wrap it in a Collection or some sort of List? I.e:

ObjectOutputStream oos = new ObjectOutputStream(...);
oos.writeObject(integerCollection);



ObjectInputStream ois = new ObjectInputStream(...);
Collection integerCollection = (Collection)ois.readObject();

answered Mar 19, 2009 at 21:27

Björn

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Comments

GETah · Accepted Answer · 2011-06-08 14:39:42Z

0

What protocol are you using to send this data over your link? You can wrap your array in an object that can be serialized into an output stream.

TCP: Things should be pretty simple in this case. The transport layer will take care of fragmenting your object and getting it right at the other end of the link.

UDP: Things can get a little bit complicated; If the object you are trying to serialize is bigger than the UDP buffers (in terms of bytes) then you might not be able to get the data through. In this situation, you can send your data in chunks that are smaller than the default UDP buffer size.

Regards,

answered Jun 8, 2011 at 14:39

GETah

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Jason Plank · Accepted Answer · 2011-03-23 00:54:00Z

-3

using

ArrayList a=new ArrayList(n)    //n represents size

or

List a=new List()

we can send to a server

edited Mar 23, 2011 at 0:54

Jason Plank

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answered Nov 28, 2009 at 9:08

KaliRagavendran

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