removing the objectoutputstream collection intake

Hey guys, I have problems to remove a connection.

How his installation:

first of all I'm doing a chatclient where several users can enter and use for cat
When the client is connected to chatserver

an ArrayList is used to keep track off the coast of socket (objectoutputStream), so the Chatserver can write objects for them later.
So what exactly happens, is when the server accepts the socket, I create objectoutputstream as shown below and add it to ObjectoutPutstream ArrayList, so objects can be written later to these customers. But the problem occurs when I disconnect one of the customers. Objecoutputstream ArrayList still has disconnected and related customer tries to write objects in client disconnected, which then results in an exception. I tried everything and can not find a way to remove the client disconnected from collection objectoutputstream.

What I tried
I tried to use sockets instead of objectoutputstream collection that is a socket becaouse has a connected called method that returns a Boolean value, it sends a null object to the client. weird, isn't it?

ServerSocket serverScoket = new ServerSocket(5000);

Socket clientSocket = serverSocket.accept();//accepting socket

ObjectOutputStream stream = new ObjectOutputStream(clientSocket.getObjectOutputStream));

objectoutputstreamList.add(stream);//adding stream to collection of objecoutputstream

Code of IM client we help to debug

package ChatClient;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import testingchat.UserInfo;


public class ChatClient {

    ObjectOutputStream sendPacket = null;
    ObjectInputStream comingPacket = null;
    Socket clientSocket = null;
    UserInfo checkingUserName = null;

    //connection details
    private int portNumber;
    private String serverIp;
    /**
     * Constructor
     */
    public ChatClient(){
    }

    /**
     * We contact the server and try send data through stream
     */
    public void makeConnection(){
        try{
            clientSocket = new Socket(serverIp,portNumber);
            sendPacket = new ObjectOutputStream(clientSocket.getOutputStream());
            comingPacket = new ObjectInputStream(clientSocket.getInputStream());

            Thread newThread = new Thread(new PacketReader());
            newThread.start();
            System.out.println("networking established");
        }catch (Exception e){
            e.printStackTrace();
        }
    }


    /**
     * Sending packet to the server
     */
    public void sendPacket(UserInfo userPacket){
        try {

            sendPacket.writeObject(userPacket);
            System.out.println(userPacket.getUserName());
        } catch (IOException ex) {
        }
    }

    public class PacketReader implements Runnable{
         public void run() {
            try {
                UserInfo user;
                while((user = (UserInfo) comingPacket.readObject()) != null){
                    checkingUserName = user;
                    System.out.println(checkingUserName.getUserName()+" inside emthod packetReader");
                }
            } catch (Exception ex) {
            }
        }
    }

    /**
     * @param setting up portNum
     */
    public void setPortNum(int portNum){
        portNumber = portNum;
    }

    /**
     * @param setting up serverIp
     */
    public void setServerIp(String serverIp){
        this.serverIp = serverIp;
    }

    /**
     * Sending messages to user client user interface
     */
    public UserInfo sendUserInfo(){
        return checkingUserName;
    }

    /**
     * Checking UserName Valid
     */
    public boolean checkValidName(){
        System.out.println(checkingUserName);
       return checkingUserName.isUserValid();
    }

    
}

Code for chatserver

package testingchat;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Iterator;

/**
 *
 *
 */
public class ChatServer {
    //To write objects to client
    private ArrayList<ObjectOutputStream> streamList;
    private ArrayList<UserInfo> totalUsers;
    /**
     * Constructor
     */
    public ChatServer(){
    }

    /**
     * making contact with client
     */
    public void makeConnection(){
        try {
            streamList = new ArrayList<ObjectOutputStream>();
            ServerSocket serversocket = new ServerSocket(5000);
            System.out.println("connecting to client......");
            while (true){
                Socket client = serversocket.accept();
                System.out.println("made a connection");

                ObjectOutputStream stream = new ObjectOutputStream(client.getOutputStream());
                streamList.add(stream);

                Thread newThread = new Thread(new ClientHandler(client));
                newThread.start();
            }
        } catch (IOException ex) {
        }
    }
    
    public static void main(String[] args){
        new ChatServer().makeConnection();
    }

    public class ClientHandler implements Runnable{
        Socket clienti = null;
        ObjectInputStream stream = null;
        public ClientHandler(Socket sock){
            totalUsers = new ArrayList<UserInfo>();
            clienti = sock;
            try{
                stream = new ObjectInputStream(clienti.getInputStream());
            } catch(Exception e){
            }
        }
        public void run(){
            try {
            UserInfo userinfo = (UserInfo) stream.readObject();
            totalUsers.add(userinfo);
            if(userinfo.isCheckingForValidName()){
                System.out.println(userinfo.getUserName()+"inside chatserver line 66");
                confirmUserName(userinfo);
            }else if(userinfo.isUserValid()){
                     sendToClient(userinfo);
            }
        } catch (Exception e){
            e.printStackTrace();
        }
        }

        public void sendToClient(UserInfo user){
            Iterator it = streamList.iterator();
            while (it.hasNext()){
            try {
                ObjectOutputStream objectWriter =  (ObjectOutputStream) it.next();
                objectWriter.writeObject(user);
                objectWriter.flush();
            } catch (Exception ex) { ex.printStackTrace(); }
        }
        }

        /**
         * Informs the login client whether any user with a incoming name is
         *
         */
        public void confirmUserName(UserInfo oCheckUser) {
            try {
                for (UserInfo users : totalUsers) {
                    if (oCheckUser.getUserName().equals(users.getUserName())) {
                        oCheckUser.setUserValid(false);
                    } else {
                        oCheckUser.setUserValid(true);
                        oCheckUser.setCheckingForValidName(false);
                    }
                    //writing objects to client
                    for (ObjectOutputStream outGoing : streamList) {

                        outGoing.writeObject(oCheckUser);
                        outGoing.flush();
                    }
                    break;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}

userInfo class, is the client object that sends to the server and server sends to clients deferential

package testingchat;
import testingchat.*;
import java.io.Serializable;
/**
 *
 * 
 */
public class UserInfo implements Serializable{

    private String userName;
    private String message;
    private boolean checkingUserName;
    private boolean isUserValid;

    /**
     * Constructor
     */
    public UserInfo(){
        checkingUserName = true;
        isUserValid = false;
    }

    /**
     * Sending message to users
     * @param sMessage
     */
    public void sendMessage(String sMessage){
        message = sMessage;
    }

    /**
     * setting up user's Name
     * @param userName
     */
    public void setUser(String userName){
        this.userName = userName;
    }

    /**
     * @return message
     */
    public String getMessage(){
        return message;
    }

    /**
     * @return userName
     */
    public String getUserName(){
        return userName;
    }

    /**
     * @param oCheckingName
     */
    public void setCheckingForValidName(boolean oCheckingName){
        checkingUserName = oCheckingName;
    }

    /**
     * @return checkingUserName
     */
    public boolean isCheckingForValidName(){
        return checkingUserName;
    }

    /**
     * @param userValid
     */
    public void setUserValid(boolean userValid){
        isUserValid = userValid;
    }

    /**
     * @return isUserValid
     */
    public boolean isUserValid(){
       return isUserValid;
    }

}

Bravo guys, some help would be really appreciated

The title of your son and the question that you ask, is how to remove something from a collection. I responded to it, not that it be answered if you read the Javadoc.

What you want to know but have never actually asked is when* to remove from the collection. The answer is when you read EOS or get an IOException reading or writing of the connection.

You will find that when you express yourself clearly, you will get clear answers. You will also write better code...

Tags: Java

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