JAVA聊天软件源码

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package at.ac.uni_linz.tk.vchat;
 
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.image.*;
 
/**
 * Implements the methods for the client side's networking. Opens a socket
 * connection and Input- and OutputStreams to the ChatServer, sends and receives
 * data. It also includes the functionality for User logins and logouts.
 * 
 * @author Arno Huetter (C)opyright by the Institute for Computer Science,
 *         Telecooperation Department, University of Linz
 */
 
public class ChatClient implements Runnable {
 
    private Socket clientSocket;
    private Thread clientThread;
    private String host;
    private boolean connected;
    private ChatApplet chatApplet;
 
    private ObjectOutputStream output;
    private ObjectInputStream input;
 
    private UserLoginRequest userLogin;
 
    /**
     * Constructs the ChatClient.
     * 
     * @param hostParam
     *            the host where the ChatApplet descends from (that is also
     *            where the ChatServer ought to be running)
     * @param portParam
     *            the standard port where the ChatServer is listening
     * @param chatParam
     *            the ChatApplet which administrates the users
     */
 
    public ChatClient(String hostParam, ChatApplet chatParam) {
        host = hostParam;
        chatApplet = chatParam;
    }
 
    /**
     * Connects to the ChatServer.
     * 
     * @param portParam
     *            the port where the ChatServer is listening
     */
 
    public void connect(int portParam) {
        try {
            chatApplet.setStatus("Connecting...", true);
            clientSocket = new Socket(host, portParam);
 
            /*
             * Open Input- and OutputStreams
             */
            input = new ObjectInputStream(clientSocket.getInputStream());
            output = new ObjectOutputStream(clientSocket.getOutputStream());
 
            try {
                Thread.sleep(1000);
            } catch (InterruptedException excpt) {
            }
 
            /*
             * Start the thread that is receiving data
             */
            clientThread = new Thread(this);
            clientThread.start();
            connected = true;
            chatApplet.setStatus("Connected", true);
        } catch (Exception excpt) {
            connected = false;
            System.out.println("Exception while connecting: " + excpt);
            chatApplet
                    .setStatus(
                            "Exception while connecting. Server down, firewall config or file-URL applet.",
                            true);
        }
    }
 
    /**
     * Waits for the ChatServer's reply to a login request.
     */
 
    public void waitForLoginReply() {
        while (userLogin.status == UserLoginRequest.REQUESTED && connected()) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException excpt) {
            }
        }
    }
 
    /**
     * Connects to the ChatServer and sends a login request for an existing
     * User.
     * 
     * @param userNameParam
     *            the name of the User to login
     * @param userPasswordParam
     *            the password of the User to login
     * @param portParam
     *            the port where the ChatServer is listening
     */
 
    public void connectAsExistingUser(String userNameParam,
            String userPasswordParam, int portParam) {
        int lastUserId;
 
        connect(portParam);
        if (connected) {
            chatApplet.setStatus("Connecting as existing user...", true);
            chatApplet.stopSimulator();
            chatApplet.removeAllExceptDefaultRoom();
            userLogin = new ExistingUserLoginRequest(userNameParam,
                    userPasswordParam);
            send(userLogin);
            chatApplet.setStatus("Waiting for server reply...", true);
            waitForLoginReply();
            if (userLogin.status == UserLoginRequest.ACCEPTED) {
                lastUserId = chatApplet.getCurrentUserId();
                chatApplet.setCurrentUser(userLogin.user);
 
                if (userLogin.user.getId() != lastUserId)
                    chatApplet.removeUser(lastUserId);
 
                chatApplet.restartHistory();
                chatApplet.setStatus("Login accepted: "
                        + userLogin.statusString, true);
                chatApplet.setFrameVisibility(true);
            } else {
                disconnect();
                chatApplet.setStatus("Login denied: " + userLogin.statusString,
                        true);
            }
        }
    }
 
    /**
     * Connects to the ChatServer and sends a login request for a new User.
     * 
     * @param userParam
     *            the User to login
     * @param portParam
     *            the port where the ChatServer is listening
     */
 
    public void connectAsNewUser(User userParam, int portParam) {
        int lastUserId;
 
        connect(portParam);
        if (connected) {
            chatApplet.setStatus("Connecting as new user...", true);
            chatApplet.stopSimulator();
            chatApplet.removeAllExceptDefaultRoom();
 
            userLogin = new NewUserLoginRequest(userParam);
            send(userLogin);
            chatApplet.setStatus("Waiting for server reply...", true);
            waitForLoginReply();
            if (userLogin.status == UserLoginRequest.ACCEPTED) {
                lastUserId = chatApplet.getCurrentUserId();
                chatApplet.setCurrentUser(userLogin.user);
 
                if (userLogin.user.getId() != lastUserId)
                    chatApplet.removeUser(lastUserId);
 
                chatApplet.restartHistory();
                chatApplet.setStatus("Login accepted: "
                        + userLogin.statusString, true);
                chatApplet.setFrameVisibility(true);
            } else {
                disconnect();
                chatApplet.setStatus("Login denied: " + userLogin.statusString,
                        true);
            }
        }
    }
 
    /**
     * Disconnects from the ChatServer.
     */
 
    public void disconnect() {
        try {
            send(new UserLogoutEvent(chatApplet.getCurrentUserId()));
            if (clientThread != null && clientThread.isAlive())
                clientThread.stop();
            if (output != null)
                output.close();
            if (input != null)
                input.close();
            if (clientSocket != null)
                clientSocket.close();
            chatApplet.setStatus("Disconnected", true);
        } catch (IOException excpt) {
            System.out.println("Exception while disconnecting: " + excpt);
            chatApplet.setStatus("Exception while disconnecting", true);
        } finally {
            connected = false;
            chatApplet.removeAllExceptCurrentUser();
            chatApplet.removeAllExceptDefaultRoom();
        }
    }
 
    /**
     * Runs a thread that is receiving data from the InpuStream openend to the
     * ChatServer.
     */
 
    public void run() {
        Object receivedObject;
        User user;
        while (connected) {
            try {
                receivedObject = input.readObject();
                chatApplet.setStatus("Receiving data");
                if (receivedObject instanceof UserPositionEvent)
                    chatApplet.setUserPosition(
                            ((UserPositionEvent) receivedObject).userId,
                            ((UserPositionEvent) receivedObject).userPosition,
                            false);
                else if (receivedObject instanceof UserHeadingEvent)
                    chatApplet.setUserHeading(
                            ((UserHeadingEvent) receivedObject).userId,
                            ((UserHeadingEvent) receivedObject).userHeading,
                            false);
                else if (receivedObject instanceof UserMessageEvent)
                    chatApplet.setUserMessage(
                            ((UserMessageEvent) receivedObject).userId,
                            ((UserMessageEvent) receivedObject).userMessage,
                            false);
                else if (receivedObject instanceof UserMoodEvent)
                    chatApplet.setUserMood(
                            ((UserMoodEvent) receivedObject).userId,
                            ((UserMoodEvent) receivedObject).userMood, false);
                else if (receivedObject instanceof UserRoomEvent) {
                    chatApplet.moveUserToRoom(
                            ((UserRoomEvent) receivedObject).userId,
                            ((UserRoomEvent) receivedObject).roomId, false);
                    chatApplet.setUserPosition(
                            ((UserRoomEvent) receivedObject).userId,
                            ((UserRoomEvent) receivedObject).position, false);
                } else if (receivedObject instanceof UserUpdateEvent) {
                    chatApplet.updateUser(
                            ((UserUpdateEvent) receivedObject).user, false);
                    if (((UserUpdateEvent) receivedObject).user.getId() == chatApplet
                            .getCurrentUserId()) {
                        chatApplet
                                .setStatus(
                                        ((UserUpdateEvent) receivedObject).statusString,
                                        false);
                    }
                } else if (receivedObject instanceof UserLoginEvent)
                    chatApplet.addUser(((UserLoginEvent) receivedObject).user);
                else if (receivedObject instanceof UserLogoutEvent) {
                    chatApplet
                            .removeUser(((UserLogoutEvent) receivedObject).userId);
                } else if (receivedObject instanceof NewUserLoginRequest) {
                    chatApplet.setStatus("Received login", true);
                    userLogin = (NewUserLoginRequest) receivedObject;
                } else if (receivedObject instanceof ExistingUserLoginRequest) {
                    chatApplet.setStatus("Received login", true);
                    userLogin = (ExistingUserLoginRequest) receivedObject;
                } else if (receivedObject instanceof RoomUpdateEvent) {
                    chatApplet.setStatus("Received room update", true);
                    chatApplet.updateRoom(
                            ((RoomUpdateEvent) receivedObject).room, false);
                } else if (receivedObject instanceof RoomCreateEvent) {
                    chatApplet.setStatus("Received room creation", true);
                    chatApplet.updateRoom(
                            ((RoomCreateEvent) receivedObject).room, false);
                } else if (receivedObject instanceof RoomListEvent) {
                    chatApplet.setStatus("Received room list", true);
                    chatApplet
                            .setRoomTable(((RoomListEvent) receivedObject).roomTable);
                } else if (receivedObject instanceof RoomRemoveEvent) {
                    chatApplet.setStatus("Received room removal", true);
                    chatApplet.forceRoomRemoval(
                            ((RoomRemoveEvent) receivedObject).roomId, false);
                }
            } catch (Exception excpt) {
                System.out.println("Exception while receiving data: " + excpt
                        + ". Going offline...");
                chatApplet.setStatus(
                        "Exception while receiving data. Going offline...",
                        true);
                disconnect();
            }
        }
    }
 
    /**
     * Sends data over the OutputStream openend to the ChatServer.
     * 
     * @param sendObject
     *            the object to be sent
     */
 
    public void send(Object sendObject) {
        try {
            if (connected) {
                chatApplet.setStatus("Sending data");
                output.writeObject(sendObject);
            }
        } catch (IOException excpt) {
            System.out.println("Exception while sending data: " + excpt
                    + ". Going offline...");
            chatApplet.setStatus(
                    "Exception while sending data. Going offline...", true);
            disconnect();
        }
    }
 
    /**
     * Sends data over the OutputStream openend to the ChatServer.
     * 
     * @param sendObject
     *            the object to be sent
     */
 
    public boolean connected() {
        return connected;
    }
 
    /**
     * Returns the host where the ChatClient is opening connections to.
     */
 
    public String getHost() {
        return host;
    }
 
}
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