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Thread: getting closed server socket in client thread

  1. #1
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    Question unable to get server socket in client thread

    Hi ,
    I am developing client server based application.
    After reading the data from the server clients open the thread and starts it in the thread im unable to get data from server when i do it says socket is already closed even the server program is running.
    Following is my server THREAD code : which send data to client :
    [code]
    ServerSocket main = ser.Socket();
    while(true){
    clientsocket = main.accept();

    rdr= new BufferedReader( new InputStreamReader(clientsocket.getInputStream()));
    String t="";
    String name=rdr.readLine();
    System.out.println("Client connected '"+ name +"'");
    LstClient.AddClient(name, clientsocket);
    ser.clientsNames = LstClient.ClientNames();
    objwriter = new ObjectOutputStream(clientsocket.getOutputStream()) ;
    objwriter.writeObject(ser.clientsNames);
    objwriter.flush();
    cam = new Camera();
    System.out.println("Turning Camera ON");
    cam.cam().open();
    System.out.println("Camera live , sending thread on");
    Thread.sleep(1000);
    wr = new BufferedWriter(new OutputStreamWriter(clientsocket.getOutputStream()) );
    wr.write("abc"+'\n');**client thread will read this**

    [/code/
    following the the client when receives data from server till this line before "TURING CAM ON" and than it donot receive data , it opens a thread and there client need to receive abc from server. Following is the client class :
     public Client(String serverIp,int port,String name) throws Exception{
     
            try{
                //CloseSocket();
                mainSock= new Socket(serverIp, port);
                writer= new BufferedWriter(new OutputStreamWriter(mainSock.getOutputStream()));
                writer.write(name);
                writer.write('\n');
                writer.flush();
                objin = new ObjectInputStream(mainSock.getInputStream());
                ClientsName = (String[])objin.readObject();
                System.out.println("Client no.'"+ ClientsName.length );
            }
            catch(Exception ex){
                 CloseSocket();
                throw new Exception("Error : "+ ex.getMessage());
     
            }
            finally{
                if(writer!=null){
                    writer.close();
                }
                if(objin!=null){
                    objin.close();
                }
     
     
            }
     
        }
        public void ReadVideo(){
     
            try{
            if(mainSock!=null){
                System.out.println("Starting reading video in 7 sec");
                camrdr = new TCameraReader(mainSock);
                Thread.sleep(7500);
                System.out.println("Starting reading, thread started");
                camrdr.start();
            }
            else {
                System.out.println("Server not found");
     
            }

    and this is the thread clients opens but it says socket is closed.

          private ObjectInputStream objin=null;
        private Socket serverSocket=null;
        private Webcam cam=null;
        public TCameraReader(Socket c)
        {
            serverSocket = c;
     
        }
     
     
        @Override
        public void run(){
            try{
     
                    try{
                        System.out.println("Reading video");
                        BufferedReader rdr= new BufferedReader( new InputStreamReader(serverSocket.getInputStream()));
                        System.out.println(rdr.readLine());
    [B]                    **here is says socket is closed - here it need to read abc from server**
    [/B]                    
                    }
                    catch(Exception ex1){
                        throw new InterruptedException(ex1.getMessage());
                    }
     
                    finally{
                        try{
                            if(objin!=null)
                            {
                                objin.close();
                            }
                        }
                        catch(Exception ex3){
                            throw new InterruptedException(ex3.getMessage());
                        }
     
                    }
     
     
            }
            catch(InterruptedException ex){
                throw new RuntimeException(ex.getMessage());
            }
     
     
        }


  2. #2
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    Question getting closed server socket in client thread

    Hi ,
    I am developing client server based application.
    After reading the data from the server clients open the thread and starts it in the thread im unable to get data from server when i do it says socket is already closed even the server program is running.
    Following is my server THREAD code : which send data to client :

    ServerSocket main = ser.Socket();
    while(true){
    clientsocket = main.accept();

    rdr= new BufferedReader( new InputStreamReader(clientsocket.getInputStream()));
    String t="";
    String name=rdr.readLine();
    System.out.println("Client connected '"+ name +"'");
    LstClient.AddClient(name, clientsocket);
    ser.clientsNames = LstClient.ClientNames();
    objwriter = new ObjectOutputStream(clientsocket.getOutputStream()) ;
    objwriter.writeObject(ser.clientsNames);
    objwriter.flush();
    cam = new Camera();
    System.out.println("Turning Camera ON");
    cam.cam().open();
    System.out.println("Camera live , sending thread on");
    Thread.sleep(1000);
    wr = new BufferedWriter(new OutputStreamWriter(clientsocket.getOutputStream()) );
    wr.write("abc"+'\n');**client thread will read this**


    following the the client when receives data from server till this line before "TURING CAM ON" and than it donot receive data , it opens a thread and there client need to receive abc from server. Following is the client class :

    public Client(String serverIp,int port,String name) throws Exception{

    try{
    //CloseSocket();
    mainSock= new Socket(serverIp, port);
    writer= new BufferedWriter(new OutputStreamWriter(mainSock.getOutputStream()));
    writer.write(name);
    writer.write('\n');
    writer.flush();
    objin = new ObjectInputStream(mainSock.getInputStream());
    ClientsName = (String[])objin.readObject();
    System.out.println("Client no.'"+ ClientsName.length );
    }
    catch(Exception ex){
    CloseSocket();
    throw new Exception("Error : "+ ex.getMessage());

    }
    finally{
    if(writer!=null){
    writer.close();
    }
    if(objin!=null){
    objin.close();
    }


    }

    }
    public void ReadVideo(){

    try{
    if(mainSock!=null){
    System.out.println("Starting reading video in 7 sec");
    camrdr = new TCameraReader(mainSock);
    Thread.sleep(7500);
    System.out.println("Starting reading, thread started");
    camrdr.start();
    }
    else {
    System.out.println("Server not found");

    }



    and this is the thread clients opens but it says socket is closed.

    private ObjectInputStream objin=null;
    private Socket serverSocket=null;
    private Webcam cam=null;
    public TCameraReader(Socket c)
    {
    serverSocket = c;

    }


    @Override
    public void run(){
    try{

    try{
    System.out.println("Reading video");
    BufferedReader rdr= new BufferedReader( new InputStreamReader(serverSocket.getInputStream()));
    System.out.println(rdr.readLine());
    **here is says socket is closed - here it need to read abc from server**

    }
    catch(Exception ex1){
    throw new InterruptedException(ex1.getMessage());
    }

    finally{
    try{
    if(objin!=null)
    {
    objin.close();
    }
    }
    catch(Exception ex3){
    throw new InterruptedException(ex3.getMessage());
    }

    }


    }
    catch(InterruptedException ex){
    throw new RuntimeException(ex.getMessage());
    }


    }

  3. #3
    Super Moderator pbrockway2's Avatar
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    Default Re: unable to get server socket in client thread

    Possible duplicate. merging.

    @OP: please edit your post to make it readable. Put [code] at the start of a section of code and [/code] at the end: that wy the code will be formatted. You may have to check that the indentation is correct.

  4. #4
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    Default Re: unable to get server socket in client thread

    Hi ,
    I am developing client server based application.
    After reading the data from the server clients open the thread and starts it in the thread im unable to get data from server when i do it says socket is already closed even the server program is running.
    Following is my server THREAD code : which send data to client :
      ServerSocket main = ser.Socket();
                while(true){
                clientsocket = main.accept();
     
                rdr= new BufferedReader( new InputStreamReader(clientsocket.getInputStream()));
                String t="";
                String name=rdr.readLine();
                System.out.println("Client connected '"+ name +"'");
                LstClient.AddClient(name, clientsocket);
                ser.clientsNames = LstClient.ClientNames();
                objwriter = new ObjectOutputStream(clientsocket.getOutputStream());
                objwriter.writeObject(ser.clientsNames);
                objwriter.flush(); 
                cam = new Camera();
                System.out.println("Turning Camera ON");
                cam.cam().open();
                System.out.println("Camera live , sending thread on");
                Thread.sleep(1000);
                wr = new BufferedWriter(new OutputStreamWriter(clientsocket.getOutputStream()));
                    wr.write("abc"+'\n');[B]**client thread will read this**[/B]
    following the the client when receives data from server till this line before "TURING CAM ON" and than it donot receive data , it opens a thread and there client need to receive abc from server. Following is the client class :

     public Client(String serverIp,int port,String name) throws Exception{
     
            try{
                //CloseSocket();
                mainSock= new Socket(serverIp, port);
                writer= new BufferedWriter(new OutputStreamWriter(mainSock.getOutputStream()));
                writer.write(name);
                writer.write('\n');
                writer.flush();
                objin = new ObjectInputStream(mainSock.getInputStream());
                ClientsName = (String[])objin.readObject();
                System.out.println("Client no.'"+ ClientsName.length );
            }
            catch(Exception ex){
                 CloseSocket();
                throw new Exception("Error : "+ ex.getMessage());
     
            }
            finally{
                if(writer!=null){
                    writer.close();
                }
                if(objin!=null){
                    objin.close();
                }
     
     
            }
     
        }
        public void ReadVideo(){
     
            try{
            if(mainSock!=null){
                System.out.println("Starting reading video in 7 sec");
                camrdr = new TCameraReader(mainSock);
                Thread.sleep(7500);
                System.out.println("Starting reading, thread started");
                camrdr.start();
            }
            else {
                System.out.println("Server not found");
     
            }

    and this is the thread clients opens but it says socket is closed.

          private ObjectInputStream objin=null;
        private Socket serverSocket=null;
        private Webcam cam=null;
        public TCameraReader(Socket c)
        {
            serverSocket = c;
     
        }
     
     
        @Override
        public void run(){
            try{
     
                    try{
                        System.out.println("Reading video");
                        BufferedReader rdr= new BufferedReader( new InputStreamReader(serverSocket.getInputStream()));
                        System.out.println(rdr.readLine());
    [B][B]                    **here is says socket is closed - here it need to read abc from server**[/B][/B]
     
                    }
                    catch(Exception ex1){
                        throw new InterruptedException(ex1.getMessage());
                    }
     
                    finally{
                        try{
                            if(objin!=null)
                            {
                                objin.close();
                            }
                        }
                        catch(Exception ex3){
                            throw new InterruptedException(ex3.getMessage());
                        }
     
                    }
     
     
            }
            catch(InterruptedException ex){
                throw new RuntimeException(ex.getMessage());
            }
     
     
        }

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: getting closed server socket in client thread

    Can you make a small complete program the compiles, executes and shows the problem.
    It is not possible to compile and execute what you have posted for testing.
    If you don't understand my answer, don't ignore it, ask a question.

  6. #6
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    Default Re: getting closed server socket in client thread

    Quote Originally Posted by Norm View Post
    Can you make a small complete program the compiles, executes and shows the problem.
    It is not possible to compile and execute what you have posted for testing.
    in first code : there is server thread waiting for client to connect. the second part is client main class which connects with ser and do write name , server update the clients name and send all the client name to client as String[] after receiving clientnames array from server for further receiving client opens the thread as third code snippet but in the
    BufferedReader rdr= new BufferedReader( new InputStreamReader(serverSocket.getInputStream()));

    it says server socket is closed on the other hand server is writing abc there which should be received from this thread.
    SHould i post all related code here ?

  7. #7
    Super Moderator Norm's Avatar
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    Default Re: getting closed server socket in client thread

    SHould i post all related code here ?
    Can you make a small complete program the compiles, executes and shows the problem?
    If you don't understand my answer, don't ignore it, ask a question.

  8. #8
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    Default Re: getting closed server socket in client thread

    i got error actually closing the streams close the socket , is ther any way i can close stream without closing the socket and reopen the stream
    thanks

  9. #9
    Super Moderator Norm's Avatar
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    Default Re: getting closed server socket in client thread

    Why close the stream?
    If you don't understand my answer, don't ignore it, ask a question.

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