i did try to test some stuff about Client/server communication in Java because i wanted to build a game with a client/server architecture.
So i read some articles and so on... it all worked till i tried to use the same classes and methods in a libGDX project client and the other as server was still the original java project.
than the fun started and i got class not found exceptions on the server side when the server where trying to read the object.
after that i tried to build client and server both as libGDX projects. still the same error.
the serve:
package com.mygdx.game;
import java.io.IOException;
import java.net.*;
public class Server {
public static void main(String[] args) {
int port = 8800;
try {
ServerSocket serverSocket = new ServerSocket(port);
while (true) {
System.out.println("raedy");
Socket clientSocket = serverSocket.accept();
System.out.println(clientSocket+"verbunden!");
Worker worker = new Worker(clientSocket);
worker.start();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
package com.mygdx.game;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
public class Worker extends Thread{
private Socket clientSocket;
public Worker(Socket clientsocket) {
this.clientSocket = clientsocket;
}
@Override
public void run() {
System.out.println("worker started");
try {
ObjectInputStream in= new ObjectInputStream(clientSocket.getInputStream());
Object obj = (Object) in.readObject();
if(obj instanceof Message) {
Message msg= (Message) in.readObject();
System.out.println("Client said: "+msg.getMessage());
}
System.out.println("input auf"+clientSocket.getLocalPort());
ObjectOutputStream out = new ObjectOutputStream(clientSocket.getOutputStream());
out.writeObject(new Message("Hello there!"));
System.out.println("output auf"+clientSocket.getPort());
} catch (IOException | ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.mygdx.game;
import java.io.Serializable;
public class Message implements Serializable{
private static final long serialVersionUID = 1L;
private String message;
public Message(String message) {
this.message = message;
}
public String getMessage(){
return message;
}
}
the client has the the same Message class and this:
package com.mygdx.game.desktop;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import com.badlogic.gdx.backends.lwjgl.LwjglApplication;
import com.badlogic.gdx.backends.lwjgl.LwjglApplicationConfiguration;
import com.mygdx.game.MyGdxGame;
public class DesktopLauncher {
public static void main (String[] arg) {
int port = 8800;
try {
System.out.println("hello there!");
Socket client = new Socket("localhost", port );
ObjectOutputStream out = new ObjectOutputStream(client.getOutputStream());
out.writeObject(new Message("ich bin der client"));
System.err.println(client.getPort());
ObjectInputStream in = new ObjectInputStream(client.getInputStream());
Message msg= (Message) in.readObject();
System.out.println("Server said: "+msg.getMessage());
System.out.println(client.getLocalPort());
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
LwjglApplicationConfiguration config = new LwjglApplicationConfiguration();
new LwjglApplication(new MyGdxGame(), config);
}
}
so my question is why does the same code work in normal java but when i build the same as a libGDX project and try the code there it doesn't work?
yes the message class is only for testing how a serializable object is transferred. Later i want to send game commands via the object stream.
ps: you made it till the end! thank you :D
pps: the first try in java was without
Object obj = (Object) in.readObject();
if(obj instanceof Message)
