Java-Gaming.org Hi !
Featured games (91)
games approved by the League of Dukes
Games in Showcase (804)
Games in Android Showcase (239)
games submitted by our members
Games in WIP (868)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  [FIXED] Problems serializing objects and sending over network  (Read 2272 times)
0 Members and 1 Guest are viewing this topic.
Offline Embedded

Junior Devvie


Medals: 1



« Posted 2012-02-15 17:59:57 »

I don't really know what im doing wrong, just trying to send an object called 'packet' from server to client using TCP.
This is how its serialized and sent server side
1  
2  
3  
4  
5  
6  
 bos = new ByteArrayOutputStream();
 objectOut = new ObjectOutputStream(bos);
 objectOut.writeObject(packet);
 String objectBytes = bos.toString();
               
 ps.println(objectBytes); // ps is a printstream, ps = new PrintStream(skt.getOutputStream());

Here is the client side code
1  
2  
3  
4  
5  
6  
7  
8  
 String data = br.readLine();

 byte[] objectData = data.getBytes();
 // Deserialize from a byte array
 bis = new ByteArrayInputStream(objectData);
 in = new ObjectInputStream(bis);
 packet = (Packet) in.readObject();
 in.close();


This is sending strings, i tried doing it by just sending a the length of the byte array, then the byte array and reciving it like that client side but just couldnt get it working. Ive had several errors probably most commen is this 'java.io.StreamCorruptedException: invalid stream header', but i also get a 'java.io.EOFException' error. Am i go going about this completely the wrong way?
Offline Riven
Administrator

« JGO Overlord »


Medals: 1371
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2012-02-15 18:19:39 »

Accidently 'converting' your binary data to text will corrupt your data.

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
 bos = new ByteArrayOutputStream();
 objectOut = new ObjectOutputStream(bos);
 objectOut.writeObject(packet);
 // String objectBytes = bos.toString();
objectOut.close();
byte[] data = objectOut.toByteArray();

dataOutputStream.writeInt(data.length);
dataOutputStream.write(data);
dataOutputStream.flush();


1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
  int len = dataInputStream.readInt();
 byte[] objectData = new byte[len];
 dataInputStream.readFully(objectData);
 // byte[] objectData = data.getBytes();

 // Deserialize from a byte array
 bis = new ByteArrayInputStream(objectData);
 in = new ObjectInputStream(bis);
 packet = (Packet) in.readObject();
 in.close();

Hi, appreciate more people! Σ ♥ = ¾
Learn how to award medals... and work your way up the social rankings!
Offline Embedded

Junior Devvie


Medals: 1



« Reply #2 - Posted 2012-02-15 18:31:35 »

Augh thanks, seems to be working now. Just buggy but thats the rest of my code i think Smiley
Pages: [1]
  ignore  |  Print  
 
 

 
Riven (581 views)
2019-09-04 15:33:17

hadezbladez (5510 views)
2018-11-16 13:46:03

hadezbladez (2402 views)
2018-11-16 13:41:33

hadezbladez (5772 views)
2018-11-16 13:35:35

hadezbladez (1223 views)
2018-11-16 13:32:03

EgonOlsen (4661 views)
2018-06-10 19:43:48

EgonOlsen (5682 views)
2018-06-10 19:43:44

EgonOlsen (3198 views)
2018-06-10 19:43:20

DesertCoockie (4095 views)
2018-05-13 18:23:11

nelsongames (5115 views)
2018-04-24 18:15:36
A NON-ideal modular configuration for Eclipse with JavaFX
by philfrei
2019-12-19 19:35:12

Java Gaming Resources
by philfrei
2019-05-14 16:15:13

Deployment and Packaging
by philfrei
2019-05-08 15:15:36

Deployment and Packaging
by philfrei
2019-05-08 15:13:34

Deployment and Packaging
by philfrei
2019-02-17 20:25:53

Deployment and Packaging
by mudlee
2018-08-22 18:09:50

Java Gaming Resources
by gouessej
2018-08-22 08:19:41

Deployment and Packaging
by gouessej
2018-08-22 08:04:08
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!