Tcp with javaFX cause error - tcp

Question

I am trying to understand TCP for my Project. I have to make a game with Network in which client can watch the main player. For that I send the state data over tcp .
But after I initialze one ChatClient and call the method set() in ChatClient I got error.
I cant figure out how to solve it.
package control;
import javafx.application.Platform;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.Socket;
public class ChatClient extends Thread {
// TextField nachricht;
ObjectInputStream ii;
ChatScreen chat;
GameScreen gamescreen;
Socket socket;
String name;
ObjectOutputStream i;
public ChatClient (String name, ChatScreen chat, GameScreen gamescreen) {
this.chat = chat;
this.gamescreen = gamescreen;
this.name = name;
}
#Override
public void run() {
// Diese Methode wird ausgeführt, wenn ein Client-Thread startet
// Baue eine Verbindung zum entfernten Rechner auf
try (Socket socket = new Socket("localhost", 9004)) {
System.out.println(name);
// this.chat.getButton().setText("w");
// Öffne einen InputStream
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
i = new ObjectOutputStream(out);
ii = new ObjectInputStream(in);
String line;
try {
line = (String) ii.readObject();
System.out.print("text");
if (line != null) {
Platform.runLater(() -> {
gamescreen.getText().appendText(line + "\n");
});
}
} catch (ClassNotFoundException | IOException e) {
e.printStackTrace();
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
public GameScreen getGameScreen() {
return gamescreen;
}
public void set() {
Platform.runLater(() -> {
try {
i.writeObject(name + ":" + chat.nachricht.getText() + "\n");
i.close();
} catch (IOException e) {
System.out.print("ws");
e.printStackTrace();
}
});
}
}
Server:
package control;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
/**
* Server for class {#link de.kaiguenster.javaintro.client.Client}, that handles all connections in their own Threads
*
* #author Kai Günster
*/
public class MultithreadedServer {
static ArrayList<ObjectOutputStream> client = new ArrayList<>();
private static int port = 9004;
public static void main(String[] args) throws IOException {
ServerSocket server = new ServerSocket(port);
// this loop runs until the program is shut down (e.g. using `CTRL+C`)
while (true) {
// wait for connection
Socket sock = server.accept();
// When a connection is accepted, handle it in a new Thread
new Thread(new AntwortProzess(sock)).start();
}
}
/**
* Create a server Server
*
* #param port
* Listen-Port
*/
private MultithreadedServer (int port) {
this.port = port;
}
private static void sendMessage(String nachricht) {
}
/**
* Wait for connection and process it.
*
* #throws IOException
*/
/**
* Runnable, to process incomming connections
*/
private static class AntwortProzess extends Thread {
private final Socket socket;
public AntwortProzess (Socket socket) {
this.socket = socket;
}
#Override
public void run() {
// Diese Methode wird vom Thread gerufen, wenn er startet.
try (Socket socket = this.socket) {
System.out.print("true");
/*
Wait 2 seconds first. This waiting priod happend in it's own
Thread and doesn't prevent other connections to be accepted.
*/
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
ObjectOutputStream i = new ObjectOutputStream(out);
ObjectInputStream ii = new ObjectInputStream(in);
client.add(i);
while (true) {
String line = (String) ii.readObject();
if (line != null) {
for (int b = 0; b < client.size(); b++) {
try {
client.get(b).writeObject(line + "\n");
// System.out.print(line);
client.get(b).flush();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
// Write one line of text back to the client.
} catch (IOException | ClassNotFoundException ex) {
System.out.println(ex);
}
}
}
}
Error:
java.net.SocketException: Socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.ObjectInputStream$PeekInputStream.peek(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.peek(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at control.ChatClient.run(ChatClient.java: 59)