Hello everyone!
So yes, Im trying to make a chat function with Java. The problem is that I have two classes. One for Client and one for ClientGUI. Where the Client one has the Logic things and the ClientGUI the design. The problem is getting is in row 46 where new ListenFromServer().start(); is getting a error
" No enclosing instance of type Controller is accessible. Must qualify the allocation with an enclosing instance of type COntroller(e.g. x.new A() where x is an instance of Controller). "
I hope someone could help me with this!
**Controller (Client logic)**
package Server;
import java.io.*;
import java.net.*;
import java.util.*;
public class Controller {
private static ObjectInputStream input;
private static ObjectOutputStream output;
private static Socket socket;
private static ClientGUI clientgui;
private static String username;
private static String server;
private static int port;
public static boolean startClient(){
try{
socket = new Socket(server, port);
}catch (Exception ex){
System.out.print("Error connecting to the server: " + ex);
return false;
}
String message = "Connection is accepted; " + socket.getInetAddress() +" - "+ socket.getPort();
System.out.println(message);
try {
input=new ObjectInputStream(socket.getInputStream());
output =new ObjectOutputStream(socket.getOutputStream());
}
catch (IOException io) {
System.out.print("Exception creating new Input/Output Stream: "+ io);
return false;
}
**********new ListenFromServer().start();********* //The problem is here
try {
output.writeObject(username);
}
catch(IOException io) {
System.out.print("Exception doing login: " + io);
disconnect();
return false;
}
return true;
}
private void display(String message) {
if(clientgui == null)
System.out.println(message);
else
clientgui.append(message +"\n");
}
public static void sendMessage(Message message) {
try {
output.writeObject(message);
}
catch(IOException exd) {
System.out.print("Eceptionwritingtoserver: " + exd);
}
}
private static void disconnect() {
try {
if(input != null)
input.close();
}catch (Exception ex){}
try{
if(output != null)
output.close();
}catch(Exception ex){}
try{
if(socket != null)
socket.close();
}catch(Exception ex){};
if (clientgui != null)
clientgui.connectionFailed();
}
public class ListenFromServer extends Thread{
public void run() {
while(true){
try{
String message = (String) input.readObject();
if(clientgui == null){
System.out.println(message);
System.out.print(":");
}
else {
clientgui.append(message);
}
}
catch(IOException io){
System.out.print("Server has closed the connection");
if(clientgui != null)
clientgui.connectionFailed();
break;
}
catch(ClassNotFoundException classex){
}
}
}
}
}
ClientGUI
package Server;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/*
* The Client with its GUI
*/
public class ClientGUI extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JLabel lblusername;
private JTextField textfieldusername, textfieldserver, textfieldportnumber;
private JButton btnlogin, btnlogout, btnonline;
private JTextArea textareamessage;
private boolean connected;
private Client client;
private int defaultPort;
private String defaultHost;
ClientGUI(String host, int port) {
super("Chat Client");
defaultPort = port;
defaultHost = host;
JPanel northPanel = new JPanel(new GridLayout(2,2));
JPanel serverAndPort = new JPanel(new GridLayout(1,2, 2, 2));
JLabel lblserveraddress = new JLabel("Server Address: ");
JLabel lblchat = new JLabel(" #BallIsLife");
JLabel lblportnumber = new JLabel("Port Number: ");
textfieldserver = new JTextField(host);
textfieldserver.setHorizontalAlignment(SwingConstants.LEFT);
textfieldserver.setFont(new Font("Tahoma", Font.PLAIN, 20));
textfieldportnumber = new JTextField("" + port);
textfieldportnumber.setFont(new Font("Tahoma", Font.PLAIN, 20));
textfieldportnumber.setHorizontalAlignment(SwingConstants.LEFT);
lblserveraddress.setFont(new Font("Tahoma", Font.PLAIN, 19));
serverAndPort.add(lblserveraddress);
serverAndPort.add(textfieldserver);
serverAndPort.add(lblchat);
serverAndPort.add(lblportnumber);
serverAndPort.add(textfieldportnumber);
lblchat.setForeground(Color.RED);
lblportnumber.setFont(new Font("Tahoma", Font.PLAIN, 19));
northPanel.add(serverAndPort);
getContentPane().add(northPanel, BorderLayout.NORTH);
JPanel panelbtn = new JPanel();
northPanel.add(panelbtn);
btnlogin = new JButton("Login");
panelbtn.add(btnlogin);
btnlogin.setFont(new Font("Tahoma", Font.PLAIN, 17));
btnlogin.addActionListener(this);
btnonline = new JButton("Online");
panelbtn.add(btnonline);
btnonline.setFont(new Font("Tahoma", Font.PLAIN, 17));
btnonline.addActionListener(this);
btnonline.setEnabled(false);
btnlogout = new JButton("Logout");
panelbtn.add(btnlogout);
btnlogout.setFont(new Font("Tahoma", Font.PLAIN, 17));
btnlogout.addActionListener(this);
btnlogout.setEnabled(false);
JButton btnPicture = new JButton("Picture");
btnPicture.setFont(new Font("Tahoma", Font.PLAIN, 17));
btnPicture.setEnabled(false);
panelbtn.add(btnPicture);
textareamessage = new JTextArea("Welcome to the #BallIsLife Chat room.\n");
textareamessage.setFont(new Font("Monospaced", Font.PLAIN, 15));
textareamessage.setLineWrap(true);
textareamessage.setEditable(false);
JPanel centerPanel = new JPanel(new GridLayout(1,1));
JScrollPane scrollPane = new JScrollPane(textareamessage);
centerPanel.add(scrollPane);
getContentPane().add(centerPanel, BorderLayout.CENTER);
JPanel southPanel = new JPanel();
getContentPane().add(southPanel, BorderLayout.SOUTH);
lblusername = new JLabel("Enter your username", SwingConstants.CENTER);
lblusername.setFont(new Font("Tahoma", Font.PLAIN, 15));
southPanel.add(lblusername);
textfieldusername = new JTextField("Write your username here.");
textfieldusername.setFont(new Font("Tahoma", Font.PLAIN, 14));
textfieldusername.setColumns(50);
southPanel.add(textfieldusername);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(823, 665);
setVisible(true);
}
//Logiken
void append(String str) {
textareamessage.append(str);
textareamessage.setCaretPosition(textareamessage.getText().length() - 1);
}
void connectionFailed() {
btnlogin.setEnabled(true);
btnlogout.setEnabled(false);
btnonline.setEnabled(false);
lblusername.setText("Enter your username");
textfieldusername.setText("Write your username here");
textfieldportnumber.setText("" + defaultPort);
textfieldserver.setText(defaultHost);
textfieldserver.setEditable(false);
textfieldportnumber.setEditable(false);
textfieldusername.removeActionListener(this);
connected = false;
}
//
public void actionPerformed(ActionEvent e) {
Object button = e.getSource();
if(button == btnlogout) {
Controller.sendMessage(new Message("", Message.LOGOUT)); //Ändra till Chatmessage klass
btnlogin.setText("Login");
return;
}
if(button == btnonline) {
Controller.sendMessage(new Message("", Message.ONLINE)); //Ändra till Chatmessage klass
return;
}
if(connected) {
Controller.sendMessage(new Message(textfieldusername.getText(), Message.MESSAGE)); //Ändra till Chatmessage klass
textfieldusername.setText("");
return;
}
if(button == btnlogin) {
String username = textfieldusername.getText();
if(username.length() == 0)
return;
String server = textfieldserver.getText();
if(server.length() == 0)
return;
String portNumber = textfieldportnumber.getText();
if(portNumber.length() == 0)
return;
int port = 0;
try {
port = Integer.parseInt(portNumber);
}
catch(Exception en) {
return;
}
client = new Client(server, username, port, this);
if(!Controller.startClient())
return;
}
connected = true;
textfieldusername.setText("");
btnlogin.setText("Send message");
btnlogin.setEnabled(true);
btnlogout.setEnabled(true);
btnonline.setEnabled(true);
textfieldserver.setEditable(false);
textfieldportnumber.setEditable(false);
textfieldusername.addActionListener(this);
}
// to start the whole thing the server
public static void main(String[] args) {
new ClientGUI("localhost", 1500);
}
}
