how to increase the file size to be upload or download between client and server

[awpad]

Hi everybody , I'd like u to help me to increase the file size that will upload or download between client and server " now i can send or receive 70 mb but once i want to increase the size to for instance 300 or 400 MB it doesn't accept
Here is part of the code
Server code :

import java.io.*;
import java.net.*;
import javax.swing.*;

public class ServerGUI extends javax.swing.JFrame {

    public String path;                         //serverFile path
    public String str = "";                     //file shares list
    public String remoteClientAddress = "";
    public ServerSocket servSocket = null;      //tcp socket for server
    public Socket sock = null;                  //server socket for connection management
    public int servPort = 0;                        //server Port number
    public DataOutputStream fileDir = null;     //to sent shares file name
    public DataInputStream selectedFile = null; //to accept client selected file name
    public DataInputStream command = null;      //to sent or receive file
    public int clientConnectStatus = 0;         //0 = client connect for the first time
    public int fileShareList = 0;               //0 = sending file share list for the first time
    public Thread readThread;                   //mainThread to handle connection for server
    public File Filelist [];

    /** Creates new form ServerGUI */
    public ServerGUI() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel4 = new javax.swing.JLabel();
        jScrollPane2 = new javax.swing.JScrollPane();
        DirectoryInfo = new javax.swing.JTextArea();
        jLabel5 = new javax.swing.JLabel();
        jLabel1 = new javax.swing.JLabel();
        StartServer = new javax.swing.JButton();
        StopServer = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        PortSelected = new javax.swing.JTextField();
        PortSelection = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        ActivityLog = new javax.swing.JTextArea();
        SetPath = new javax.swing.JButton();
        TF_FilePath = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Server interface ");
        setBackground(new java.awt.Color(0, 255, 255));
        setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
        setForeground(java.awt.Color.white);
        setResizable(false);

        jLabel4.setText("* Port Number must be between(1024-65534)");

        DirectoryInfo.setColumns(20);
        DirectoryInfo.setEditable(false);
        DirectoryInfo.setForeground(new java.awt.Color(0, 0, 255));
        DirectoryInfo.setRows(5);
        jScrollPane2.setViewportView(DirectoryInfo);

        jLabel5.setText("Active Log :");

        jLabel1.setText("List of Shared Files:");

        StartServer.setActionCommand("Start ");
        StartServer.setFocusCycleRoot(true);
        StartServer.setFocusTraversalPolicyProvider(true);
        StartServer.setLabel("Start ");
        StartServer.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                StartServerActionPerformed(evt);
            }
        });

        StopServer.setActionCommand("End ");
        StopServer.setEnabled(false);
        StopServer.setLabel("End ");
        StopServer.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                StopServerActionPerformed(evt);
            }
        });

        jLabel2.setText("Port Number:");

        PortSelected.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                PortSelectedActionPerformed(evt);
            }
        });

        PortSelection.setText("Set Port Number");
        PortSelection.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                PortSelectionActionPerformed(evt);
            }
        });

        ActivityLog.setColumns(20);
        ActivityLog.setEditable(false);
        ActivityLog.setForeground(new java.awt.Color(0, 0, 255));
        ActivityLog.setRows(5);
        jScrollPane1.setViewportView(ActivityLog);

        SetPath.setText("Browse");
        SetPath.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                SetPathActionPerformed(evt);
            }
        });

        TF_FilePath.setEditable(false);

        jLabel3.setText("LocateShraing Folder :");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 694, Short.MAX_VALUE)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(PortSelected, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(PortSelection)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 242, Short.MAX_VALUE)
                        .addComponent(StartServer, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(48, 48, 48)
                        .addComponent(StopServer, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap())
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(TF_FilePath, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(SetPath)
                        .addGap(119, 119, 119))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 249, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(32, 32, 32)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 385, Short.MAX_VALUE)
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 144, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addGap(70, 70, 70))))
                            .addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 144, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(18, 18, 18))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, 674, Short.MAX_VALUE)
                        .addContainerGap())))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 379, Short.MAX_VALUE)
            .addGroup(layout.createSequentialGroup()
                .addGap(28, 28, 28)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(PortSelected, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(PortSelection, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(StopServer)
                    .addComponent(StartServer))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jLabel4)
                .addGap(11, 11, 11)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(TF_FilePath, javax.swing.GroupLayout.PREFERRED_SIZE, 22, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(SetPath)
                    .addComponent(jLabel3))
                .addGap(29, 29, 29)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(jLabel1))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 214, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 214, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void StartServerActionPerformed(java.awt.event.ActionEvent evt) {                                            

        if(servPort==0 || TF_FilePath.getText().equals("")) {
            JOptionPane.showMessageDialog(null,"Please make sure that you entered a valid port number and a shraing folder path Before Starting a session","WARNING",0);
        } else {
            preventGUIFreezing();
            Runnable readRun = new Runnable() {
                public void run() {
                    PortSelection.setEnabled(false);
                    SetPath.setEnabled(false);
                    StartServer.setEnabled(false);
                    StopServer.setEnabled(true);
                    ActivityLog.append("Server is Waiting for Clients to connect.\n");
                    try {
                        servSocket = new ServerSocket(servPort); //prepare socket
                    } catch(Exception e) {
                        JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                    }
                    while(true) {
                        try {
                            sock = servSocket.accept(); //listen for client to connect
                            if(clientConnectStatus==0) {
                                remoteClientAddress = sock.getInetAddress().toString().substring(1,(sock.getInetAddress().toString().length()));
                                ActivityLog.append("Server Connected to "+remoteClientAddress+"\n");
                                clientConnectStatus = 1;
                            }
                        } catch(Exception e) {
                            JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                        }
                        //sent the share files name to client
                        try {
                            fileDir = new DataOutputStream(sock.getOutputStream());
                            fileDir.writeUTF(str);
                            if(fileShareList==0) {
                                ActivityLog.append("Sent the share file list to client.\n");
                                fileDir.flush();
                                fileShareList = 1;
                            }
                        } catch(Exception e) {
                            JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                        }
                        FileHandle();
                    }
                }

                public void FileHandle() {
                    //receive File name selected by the client
                    String filename = "";
                    try {
                        selectedFile = new DataInputStream(sock.getInputStream());
                        filename = selectedFile.readUTF();
                    } catch(Exception e) {
                        JOptionPane.showMessageDialog(null," Client connected successfully ","NOTIFICATION",1);
                        //Server Established Connection to the Client for the first time
                        //FOR the first cycle , selectedFile will be NULL since client hasnt
                        //request for any GETFILE or PUTFILE command
                    }
                    if(filename.equals("")) {
                        JOptionPane.showMessageDialog(null,"Server is started sharing Files ","Notification",1);
                    } else {
                        //if COMMAND = GET
                        if(filename.substring(0,3).equalsIgnoreCase("get")) {
                            sentFile(filename.substring(3,filename.length()));
                        }
                        //if COMMAND = PUT
                        if(filename.substring(0,3).equalsIgnoreCase("put")) {
                            receiveFile(filename.substring(3,filename.length()));
                        }
                    }
                }

                public void receiveFile(String lop) {
                    try {
                        Socket sock2 = servSocket.accept();
                        ActivityLog.append("Start Receiving files ->"+lop+"\n");
                        int bytesRead2;
                        int current2 = 0;
                        long start = System.currentTimeMillis();

                        //receive file
                        DataInputStream i2 = new DataInputStream(sock2.getInputStream());
                        int filesize2 = i2.readInt(); //READING THE FILE SIZE from sender
                        byte [] mybytearray2  = new byte [filesize2];
                        InputStream is2 = sock2.getInputStream();
                        FileOutputStream fos2 = new FileOutputStream(path+"/"+lop);
                        BufferedOutputStream bos2 = new BufferedOutputStream(fos2);
                        bytesRead2 = is2.read(mybytearray2,0,mybytearray2.length);
                        filesize2 = filesize2 - bytesRead2;
                        current2 = bytesRead2;
                        do
                        {
                            bytesRead2 = is2.read(mybytearray2, current2, (mybytearray2.length-current2));
                            if(bytesRead2 >= 0) {
                                current2 += bytesRead2;
                            }
                            filesize2 = filesize2 - bytesRead2;
                            System.out.println(current2);
                        } while(filesize2>-1);

                        bos2.write(mybytearray2, 0 , current2);
                        bos2.flush();
                        long end = System.currentTimeMillis();
                        ActivityLog.append("File Transfer will Complete in ->"+(end-start)+"ms.\n");
                        bos2.close();
                        sock2.close();
                    } catch(Exception e) {
                        JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                    }
                }
                //string l = filename selected by the client
                public void sentFile(String l) {
                    if(l.equals("")) {
                        //DoNothing
                    } else {
                        ActivityLog.append("Client has selected file to share -> "+l+"\n");
                        ActivityLog.append("Start Sending File. \n");
                        try {
                            //1024 experiment version sending
                            File myFile = new File(path+"/"+l);
                            DataOutputStream o = new DataOutputStream(sock.getOutputStream());
                            FileInputStream fis = new FileInputStream(myFile);
                            BufferedInputStream bis = new BufferedInputStream(fis);
                            long lenth=bis.available(); //GET THE INITIAL FILE SIZE
                            o.writeInt((int)lenth); //SEND TO CLIENT TO TELL THE TOTAL FILE SIZE
                            byte bytes[] = new byte[bis.available()];
                            int writecount;
                            while (lenth > 0) {
                                if(lenth>=1024) {
                                    writecount = 1024;
                                } else {
                                    writecount = (int)lenth;
                                }
                                bis.read(bytes, 0, writecount);
                                ActivityLog.append("Bytes Left "+lenth+"\n");
                                o.write(bytes, 0,  writecount);
                                lenth = lenth - writecount;
                            }
                            o.flush();
                            sock.close();
                            ActivityLog.append("File Finish Sending. \n");
                            //1024 experiment version sending
                        } catch(Exception e) {
                            JOptionPane.showMessageDialog(null,e.getMessage(),"WARNING!!",0);
                        }
                    }
                }
            };
            readThread = new Thread(readRun);
            readThread.start();
        }//end the FIRST IF statement
}                                           

    private void StopServerActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:
        JOptionPane.showMessageDialog(null,"Thank you ");
        System.exit(1);
}                                          

    private void PortSelectedActionPerformed(java.awt.event.ActionEvent evt) {                                             
        // TODO add your handling code here:
}                                            

    private void PortSelectionActionPerformed(java.awt.event.ActionEvent evt) {                                              
        try {
            int tempPort = Integer.parseInt(PortSelected.getText());
            if(tempPort>1023 && tempPort<65535) //start from 1024 - 65534
            {
                servPort = tempPort;
                ActivityLog.append("Port number set To -> "+servPort+"\n");
            } else {
                JOptionPane.showMessageDialog(null,"Please Enter a valid Port Number, between {1024 - 65534}","Error!!!",0);
            }
        } catch(Exception e) {
            JOptionPane.showMessageDialog(null,"Please Enter Numbers Only, between {1024 - 65534}","Error!!!",0);
        }
}                                             

    private void SetPathActionPerformed(java.awt.event.ActionEvent evt) {                                        

        JFileChooser chooser = new JFileChooser();
        chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        int returnVal = chooser.showOpenDialog(this);
        if(returnVal == JFileChooser.APPROVE_OPTION)    //if the path selected is valid
        {
            path = chooser.getSelectedFile().getPath(); //set the path into a String

            //update The Directory List
            File path2 = new File(path);
            Filelist = path2.listFiles();  //set filelist = path selected
            for(int k=0; k<Filelist.length;k++) //fill up str array with filelist
            {
                if(Filelist[k].isDirectory()) //if the file is directory
                {
                    continue;
                } else {
                    if(Filelist[k].length()<=902238600) //maximum file size 700mb
                    {
                        str = str+Filelist[k].getName()+"\n";  //str will be display in server
                    }
                }
            }
            if(DirectoryInfo.getText().equals("")) //if directory textArea is empty
            {
                DirectoryInfo.setText(str); //append the file list
                ActivityLog.append("Sharing folder path set to -> "+path+"\n");
                TF_FilePath.setText(path);
            } else {
                DirectoryInfo.setText(""); //clear the directory textArea
                DirectoryInfo.setText(str);
                ActivityLog.append("Sharing folder path set to -> "+path+"\n");
                TF_FilePath.setText(path);
            }
        }
}                                       

    //STOP SERVER CODE
    //SET FILE PATH
    //START SERVER
    //SELECT PORT
    public static void main(String args[])
    {
        java.awt.EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                new ServerGUI().setVisible(true);
            }
        });
    }

    //method to make sure the threads does not lock up repainting
    public void preventGUIFreezing()
    {
         if(SwingUtilities.isEventDispatchThread())
         {
            return;
         }
         throw new RuntimeException("file");
    }

    // Variables declaration - do not modify                     
    private javax.swing.JTextArea ActivityLog;
    private javax.swing.JTextArea DirectoryInfo;
    private javax.swing.JTextField PortSelected;
    private javax.swing.JButton PortSelection;
    private javax.swing.JButton SetPath;
    private javax.swing.JButton StartServer;
    private javax.swing.JButton StopServer;
    private javax.swing.JTextField TF_FilePath;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    // End of variables declaration                   

}
}

[awpad]

Actually , there is no error at all , it works properly , but once i want to send or receive any file which is more than 70 Mb , it start to send or receive until 70 Mb and then freeze
To terminate the session , I press end button
so my question again is , i just want to be able to send or receive more than 70 Mb
Appreciate all your replies

Client Code :

import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;

public class ClientGUI extends javax.swing.JFrame {

    public ServerSocket clientSocket = null; //tcp socket for client
    public Socket sock = null;               //client socket for connection management
    public DataInputStream streamIn = null;  //receive information from server
    public DataOutputStream streamOut = null;//sent information to server
    public String filelist = "";             //filelist receive from server
    public String [] filelist2;              //formated filelist to display in the JList
    public String selectFile = "";           //selected file's name to request to server
    public int serverPort = 0;                   //server port number
    public String serverAddress = "";             //server IP Address
    public Thread readThread;                //handle connection establish to server
    public Thread getFileThread;             //get file from server
    public Thread sendFileThread;            //send file to server
    public String path;                      //client share file path
    public String [] clientFileList;         //formated client share filelist to display in the JList
    public int serverStatus = 0;             //0 = connected


    /** Creates new form ClientGUI */
    public ClientGUI() {
        initComponents();
        this.setVisible(true);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        TF_FilePath = new javax.swing.JTextField();
        jLabel6 = new javax.swing.JLabel();
        GetFile = new javax.swing.JButton();
        jLabel5 = new javax.swing.JLabel();
        jLabel1 = new javax.swing.JLabel();
        PutFile = new javax.swing.JButton();
        setPort = new javax.swing.JButton();
        setIP = new javax.swing.JButton();
        jLabel3 = new javax.swing.JLabel();
        TFServerIP = new javax.swing.JTextField();
        setFilePath = new javax.swing.JButton();
        TFServerPort = new javax.swing.JTextField();
        jLabel7 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        ServerFile = new javax.swing.JList();
        jLabel8 = new javax.swing.JLabel();
        jLabel9 = new javax.swing.JLabel();
        jScrollPane3 = new javax.swing.JScrollPane();
        ClientFile = new javax.swing.JList();
        jLabel10 = new javax.swing.JLabel();
        startClient = new javax.swing.JButton();
        endClient = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jScrollPane2 = new javax.swing.JScrollPane();
        ActivityLog = new javax.swing.JTextArea();
        jLabel11 = new javax.swing.JLabel();
        jLabel12 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Clients Interface");

        TF_FilePath.setEditable(false);
        TF_FilePath.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                TF_FilePathActionPerformed(evt);
            }
        });

        jLabel6.setText("File Path");

        GetFile.setText("Get File >>");
        GetFile.setEnabled(false);
        GetFile.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                GetFileActionPerformed(evt);
            }
        });

        jLabel5.setText("Client share files");

        jLabel1.setText("Server IP Address :");

        PutFile.setText("<< Set File");
        PutFile.setEnabled(false);
        PutFile.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                PutFileActionPerformed(evt);
            }
        });

        setPort.setText("Set Port ");
        setPort.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                setPortActionPerformed(evt);
            }
        });

        setIP.setText("Set IP ");
        setIP.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                setIPActionPerformed(evt);
            }
        });

        jLabel3.setText("Server share files");

        TFServerIP.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                TFServerIPActionPerformed(evt);
            }
        });

        setFilePath.setText("Browse");
        setFilePath.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                setFilePathActionPerformed(evt);
            }
        });

        TFServerPort.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                TFServerPortActionPerformed(evt);
            }
        });

        jLabel7.setText("* Address entered must be same as IP address  used on server");

        ServerFile.setForeground(new java.awt.Color(0, 0, 255));
        jScrollPane1.setViewportView(ServerFile);

        jLabel8.setText("* IP Address must be a valid one , Example: 192.168.4.1");

        jLabel9.setText("* Port No. entered must be same as Port No. used on server");

        ClientFile.setForeground(new java.awt.Color(0, 0, 255));
        jScrollPane3.setViewportView(ClientFile);

        jLabel10.setText("* Port No. must be integer from (1025 - 655332)");

        startClient.setText("Start");
        startClient.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                startClientActionPerformed(evt);
            }
        });

        endClient.setText("End");
        endClient.setEnabled(false);
        endClient.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                endClientActionPerformed(evt);
            }
        });

        jLabel2.setText("Server Port :");

        jLabel4.setText("Activity Log: ");

        ActivityLog.setColumns(20);
        ActivityLog.setForeground(new java.awt.Color(0, 0, 255));
        ActivityLog.setRows(5);
        jScrollPane2.setViewportView(ActivityLog);

        jLabel11.setText("              ");

        jLabel12.setText("              ");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 820, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(0, 40, Short.MAX_VALUE)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addGap(10, 10, 10)
                            .addComponent(jLabel1)
                            .addGap(11, 11, 11)
                            .addComponent(TFServerIP, javax.swing.GroupLayout.PREFERRED_SIZE, 160, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(6, 6, 6)
                            .addComponent(setIP, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(43, 43, 43)
                            .addComponent(jLabel2)
                            .addGap(4, 4, 4)
                            .addComponent(TFServerPort, javax.swing.GroupLayout.PREFERRED_SIZE, 156, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(4, 4, 4)
                            .addComponent(setPort))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(10, 10, 10)
                            .addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 370, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(20, 20, 20)
                            .addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 340, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(10, 10, 10)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 490, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGroup(layout.createSequentialGroup()
                                    .addGap(390, 390, 390)
                                    .addComponent(jLabel10, javax.swing.GroupLayout.PREFERRED_SIZE, 280, javax.swing.GroupLayout.PREFERRED_SIZE))))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(180, 180, 180)
                            .addComponent(jLabel6)
                            .addGap(13, 13, 13)
                            .addComponent(TF_FilePath, javax.swing.GroupLayout.PREFERRED_SIZE, 233, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(10, 10, 10)
                            .addComponent(setFilePath))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(234, 234, 234)
                            .addComponent(startClient, javax.swing.GroupLayout.PREFERRED_SIZE, 65, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(102, 102, 102)
                            .addComponent(endClient, javax.swing.GroupLayout.PREFERRED_SIZE, 66, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(223, 223, 223)
                            .addComponent(jLabel12))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 117, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(287, 287, 287)
                            .addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 118, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 305, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(5, 5, 5)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(GetFile)
                                .addComponent(PutFile))
                            .addGap(7, 7, 7)
                            .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 311, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 297, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 715, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGroup(layout.createSequentialGroup()
                            .addGap(290, 290, 290)
                            .addComponent(jLabel11)))
                    .addGap(0, 40, Short.MAX_VALUE)))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 536, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(0, 16, Short.MAX_VALUE)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addGap(6, 6, 6)
                            .addComponent(jLabel1))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(1, 1, 1)
                            .addComponent(TFServerIP, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(1, 1, 1)
                            .addComponent(setIP))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(2, 2, 2)
                            .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 21, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(2, 2, 2)
                            .addComponent(TFServerPort, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addComponent(setPort))
                    .addGap(6, 6, 6)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 18, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 19, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGap(1, 1, 1)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 18, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jLabel10))
                    .addGap(14, 14, 14)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addGap(8, 8, 8)
                            .addComponent(jLabel6))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(3, 3, 3)
                            .addComponent(TF_FilePath, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addComponent(setFilePath))
                    .addGap(5, 5, 5)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addGap(1, 1, 1)
                            .addComponent(startClient))
                        .addGroup(layout.createSequentialGroup()
                            .addGap(1, 1, 1)
                            .addComponent(endClient))
                        .addComponent(jLabel12))
                    .addGap(18, 18, 18)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel3)
                        .addComponent(jLabel5))
                    .addGap(6, 6, 6)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 151, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGroup(layout.createSequentialGroup()
                            .addGap(38, 38, 38)
                            .addComponent(GetFile)
                            .addGap(17, 17, 17)
                            .addComponent(PutFile))
                        .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 151, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGap(6, 6, 6)
                    .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(6, 6, 6)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 118, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(7, 7, 7)
                    .addComponent(jLabel11)
                    .addGap(0, 16, Short.MAX_VALUE)))
        );

        pack();
    }// </editor-fold>                        

    private void TF_FilePathActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
}                                           

    private void GetFileActionPerformed(java.awt.event.ActionEvent evt) {                                        

        preventGUIFreezing();
        Runnable readRun = new Runnable() {
            public void run() {
                GetFile.setEnabled(false);
                PutFile.setEnabled(false);
                try {
                    Socket sock2 = new Socket(serverAddress,serverPort); //CHANGE IP AND PORT

                    DataInputStream streamIn2 = null;
                    DataOutputStream streamOut2 = null;

                    //receive shares file name
                    streamIn2 = new DataInputStream(sock2.getInputStream());
                    String line = streamIn2.readUTF(); //dummy string to receive the filelist
                    //System.out.println(line);

                    String file = "get"+filelist2[ServerFile.getSelectedIndex()];
                    //sent selected FileName to be download
                    try {
                        streamOut2 = new DataOutputStream(sock2.getOutputStream());
                        streamOut2.writeUTF(file);
                        ActivityLog.append("Client has select file -> "+file.substring(3,file.length())+"\n");
                        streamOut2.flush();
                    } catch(Exception e) {
                        JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                    }

                    ActivityLog.append("Start Receiving ->"+file.substring(3,file.length())+"\n");
                    int bytesRead2;
                    int current2 = 0;
                    long start = System.currentTimeMillis();

                    //receive file
                    DataInputStream i2 = new DataInputStream(sock2.getInputStream());
                    int filesize2 = i2.readInt(); //READING THE FILE SIZE from sender
                    byte [] mybytearray2  = new byte [filesize2];
                    InputStream is2 = sock2.getInputStream();
                    FileOutputStream fos2 = new FileOutputStream(path+"/"+file.substring(3,file.length()));
                    BufferedOutputStream bos2 = new BufferedOutputStream(fos2);
                    bytesRead2 = is2.read(mybytearray2,0,mybytearray2.length);
                    filesize2 = filesize2 - bytesRead2;
                    current2 = bytesRead2;
                    do
                    {
                        bytesRead2 = is2.read(mybytearray2, current2, (mybytearray2.length-current2));
                        if(bytesRead2 >= 0) {
                            current2 += bytesRead2;
                        }
                        filesize2 = filesize2 - bytesRead2;
                        System.out.println(current2);
                    } while(filesize2>0);

                    bos2.write(mybytearray2, 0 , current2);
                    bos2.flush();
                    long end = System.currentTimeMillis();
                    ActivityLog.append("File Transfer Complete in ->"+(end-start)+"ms.\n");
                    bos2.close();
                    sock2.close();
                } catch(Exception e) {
                    JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                }
                GetFile.setEnabled(true);
                PutFile.setEnabled(true);
            }
        };
        getFileThread = new Thread(readRun);
        getFileThread.start();
}                                       

    private void PutFileActionPerformed(java.awt.event.ActionEvent evt) {                                        

        preventGUIFreezing();
        Runnable readRun = new Runnable() {
            public void run() {
                try {
                    GetFile.setEnabled(false);
                    PutFile.setEnabled(false);
                    Socket sock3 = new Socket(serverAddress,serverPort); //CHANGE IP AND PORT
                    DataOutputStream streamOut3 = null;
                    DataInputStream streamIn3 = null;

                    String file = "put"+clientFileList[ClientFile.getSelectedIndex()];

                    try {
                        streamOut3 = new DataOutputStream(sock3.getOutputStream());
                        //send selected file name to be upload
                        streamOut3.writeUTF(file);
                        ActivityLog.append("Client has select file -> "+file.substring(3,file.length())+"\n");
                        streamOut3.flush();
                    } catch(Exception e) {
                        System.out.println(e.getMessage());
                    }
                    sock3.close();

                    //1024 file sending experiment
                    Socket sock4 = new Socket(serverAddress,serverPort);
                    File myFile2 = new File(path+"/"+file.substring(3,file.length()));

                    //CHANGE DATAOUTPUTSTREAM TO OUTPUTSTREM
                    DataOutputStream o2 = new DataOutputStream(sock4.getOutputStream());
                    OutputStream o3 = sock4.getOutputStream();
                    FileInputStream fis2 = new FileInputStream(myFile2);
                    BufferedInputStream bis2 = new BufferedInputStream(fis2);
                    long lenth2=bis2.available(); //GET THE INITIAL FILE SIZE
                    o2.writeInt((int)lenth2); //SEND TO CLIENT TO TELL THE TOTAL FILE SIZE
                    o2.flush();
                    byte bytes[] = new byte[1024];
                    int writecount;
                    while (lenth2 > -1) {
                        if(lenth2>=1024) {
                            writecount = 1024;
                        } else {
                            writecount = (int)lenth2;
                        }
                        bis2.read(bytes, 0, writecount);
                        ActivityLog.append("Bytes left "+lenth2+"\n");
                        o3.write(bytes, 0,  writecount);
                        lenth2 = lenth2 - writecount;
                    }
                    o3.flush();
                    sock4.close();
                    //1024 file sending experiment
                    ActivityLog.append("Finish send ->"+file.substring(3,file.length())+" To server\n");
                    GetFile.setEnabled(true);
                    PutFile.setEnabled(true);
                } catch(Exception e) {
                    JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                }
            }
        };
        sendFileThread = new Thread(readRun);
        sendFileThread.start();
}                                       

    private void setPortActionPerformed(java.awt.event.ActionEvent evt) {                                        

        try {
            int tempServerPort = Integer.parseInt(TFServerPort.getText());
            if(tempServerPort>1023 && tempServerPort<65535) //start from 1024 - 65534
            {
                serverPort = tempServerPort;
                ActivityLog.append("Port number set To -> "+serverPort+"\n");
            } else {
                JOptionPane.showMessageDialog(null,"Please Enter The Port Number In the Range of 1024 - 65534","WARNING!!",0);
            }
        } catch(Exception e) {
            JOptionPane.showMessageDialog(null,"Please Enter Numbers Only","WARNING!!",0);
        }
}                                       

    private void setIPActionPerformed(java.awt.event.ActionEvent evt) {                                      

        String tempServerAddress = TFServerIP.getText();
        String [] tempServerAddress2 = new String [4];
        int octetCount = 1;
        int ipSeg = 0;
        int [] tempServerIP = new int[4];

        for(int j=0;j<4;j++) //INIT each array of Server Address with empty String
        {
            tempServerAddress2[j] = "";
        }

        for(int k=0;k<tempServerAddress.length();k++) {
            if(tempServerAddress.substring(k, (k+1)).equals(".")) {
                octetCount++; //count the IP Entry Octet
            }
        }
        if(octetCount!=4) //If octet != 4 , its not a valid IP Entry
        {
            JOptionPane.showMessageDialog(null,"Please Enter A Valid IP Adress","Error!!!",0);
        } else {
            for(int l=0;l<tempServerAddress.length();l++) {
                if(!tempServerAddress.substring(l, (l+1)).equals(".")) {
                    tempServerAddress2[ipSeg] = tempServerAddress2[ipSeg]+tempServerAddress.substring(l, (l+1));
                } else {
                    ipSeg++; //change the Server Address2 Array to the next slot
                }
            }

            try {
                tempServerAddress = ""; //reset to empty String
                for(int m=0;m<4;m++) {   //store the string array into Integer array for comparison
                    //to check whether each array of string only contain numbers
                    tempServerIP[m] = Integer.parseInt(tempServerAddress2[m]);
                    if(tempServerIP[m]>=0 && tempServerIP[m]<=255) {
                        //re-use to existing String for comparison
                        tempServerAddress = tempServerAddress+Integer.toString(tempServerIP[m])+".";
                    }
                }
            } catch(Exception e) {
                JOptionPane.showMessageDialog(null,"Please Enter A Valid IP Adress","Error!!!",0);
                tempServerAddress = ""; //reset serverAddress to empty String
            }

            if(!tempServerAddress.equals("")) {
                serverAddress = tempServerAddress.substring(0,(tempServerAddress.length()-1));
                ActivityLog.append("IP Address set to ->"+serverAddress+"\n");
            }
        }
}                                     

    private void TFServerIPActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:
}                                          

    private void setFilePathActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
        JFileChooser chooser = new JFileChooser();
        chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        int returnVal = chooser.showOpenDialog(this);
        if(returnVal == JFileChooser.APPROVE_OPTION)    //if the path selected is valid
        {
            path = chooser.getSelectedFile().getPath(); //set the path into a String

            //update The Directory List
            File path2 = new File(path);
            File Filelist [];
            Filelist = path2.listFiles();  //set filelist = path selected
            clientFileList = new String[Filelist.length];
            for(int k=0; k<Filelist.length;k++) //fill up str array with filelist
            {
                if(Filelist[k].isDirectory()) //if the file is directory
                {
                    continue;
                } else {
                    if(Filelist[k].length()<=902238600) {
                        clientFileList[k] = Filelist[k].getName();
                    }
                }
            }
            ClientFile.setListData(clientFileList);
            TF_FilePath.setText(path);
        }
}                                           

    private void TFServerPortActionPerformed(java.awt.event.ActionEvent evt) {                                             
        // TODO add your handling code here:
}                                            

    private void startClientActionPerformed(java.awt.event.ActionEvent evt) {                                            

        if(serverAddress.equals("") || serverPort==0 || TF_FilePath.getText().equals("")) {
            JOptionPane.showMessageDialog(null,"Please Input a valid IP Adress and Port Number before Starting the session","Error!!!",0);
        } else {
            preventGUIFreezing();
            Runnable readRun = new Runnable() {
                public void run() {
                    try {
                        sock = new Socket(serverAddress,serverPort);
                        streamIn = new DataInputStream(sock.getInputStream()); //get the File List from the server
                        filelist = streamIn.readUTF(); //save the file list to the
                        setIP.setEnabled(false);
                        setPort.setEnabled(false);
                        setFilePath.setEnabled(false);
                        startClient.setEnabled(false);
                        PutFile.setEnabled(true);
                        GetFile.setEnabled(true);
                        endClient.setEnabled(true);
                        if(serverStatus == 0) {
                            ActivityLog.append("Connected to Server\n");
                            serverStatus = 1;
                        }
                        //store the filelist into filelist2 array
                        filelist2 = filelist.split("\n");

                        ServerFile.setListData(filelist2);
                        streamIn.close();
                        sock.close();
                    } catch(Exception e) {
                        JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                    }
                }
            };
            readThread = new Thread(readRun);
            readThread.start();
        }
}                                           

    private void endClientActionPerformed(java.awt.event.ActionEvent evt) {                                          
        // TODO add your handling code here:
        JOptionPane.showMessageDialog(null,"Thank you ");
        System.exit(1);
}                                         

    //DOWNLOAD FILE FROM SERVER
    //UPLOAD FILE TO SERVER
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ClientGUI().setVisible(true);
            }
        });
    }

    //method to make sure the threads does not lock up repainting
    public void preventGUIFreezing()
    {
         if(SwingUtilities.isEventDispatchThread())
         {
            return;
         }
         throw new RuntimeException("file");
    }

    // Variables declaration - do not modify                     
    private javax.swing.JTextArea ActivityLog;
    private javax.swing.JList ClientFile;
    private javax.swing.JButton GetFile;
    private javax.swing.JButton PutFile;
    private javax.swing.JList ServerFile;
    private javax.swing.JTextField TFServerIP;
    private javax.swing.JTextField TFServerPort;
    private javax.swing.JTextField TF_FilePath;
    private javax.swing.JButton endClient;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel10;
    private javax.swing.JLabel jLabel11;
    private javax.swing.JLabel jLabel12;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JLabel jLabel8;
    private javax.swing.JLabel jLabel9;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JScrollPane jScrollPane3;
    private javax.swing.JButton setFilePath;
    private javax.swing.JButton setIP;
    private javax.swing.JButton setPort;
    private javax.swing.JButton startClient;
    // End of variables declaration                   

}

[Norm]

300 or 400 MB it doesn't accept

Do you get an error message? Or please explain what "doesn't accept" means.

Please edit your code and wrap it in code tags to preserve formatting. Use the #icon above the input box.

[Tolls]

That's an awful lot of code to look at for what is essentially an "it doesn't work" question.
You;re going to have to do some debugging yourself as to what is happening, like where it's hanging (if it is)...then you might be able to give us something to work with.

[awpad]

debugging , testing have been done , and it works properly
I can send and receive files (<=70 Mb) from / to client and server
but once i try to send more than 70 Mb it didn't
i think the problem is here

//1024 file sending experiment
                    Socket sock4 = new Socket(serverAddress,serverPort);
                    File myFile2 = new File(path+"/"+file.substring(3,file.length()));

                    //CHANGE DATAOUTPUTSTREAM TO OUTPUTSTREM
                    DataOutputStream o2 = new DataOutputStream(sock4.getOutputStream());
                    OutputStream o3 = sock4.getOutputStream();
                    FileInputStream fis2 = new FileInputStream(myFile2);
                    BufferedInputStream bis2 = new BufferedInputStream(fis2);
                    long lenth2=bis2.available(); //GET THE INITIAL FILE SIZE
                    o2.writeInt((int)lenth2); //SEND TO CLIENT TO TELL THE TOTAL FILE SIZE
                    o2.flush();
                    byte bytes[] = new byte[1024];
                    int writecount;
                    while (lenth2 > -1) {
                        if(lenth2>=1024) {
                            writecount = 1024;
                        } else {
                            writecount = (int)lenth2;
                        }
                        bis2.read(bytes, 0, writecount);
                        ActivityLog.append("Bytes left "+lenth2+"\n");
                        o3.write(bytes, 0,  writecount);
                        lenth2 = lenth2 - writecount;
                    }
                    o3.flush();
                    sock4.close();
                    //1024 file sending experiment
                    ActivityLog.append("Finish send ->"+file.substring(3,file.length())+" To server\n");
                    GetFile.setEnabled(true);
                    PutFile.setEnabled(true);
                } catch(Exception e) {
                    JOptionPane.showMessageDialog(null,"Warning:"+e.getMessage(),"WARNING!!",0);
                }
            }
        };
        sendFileThread = new Thread(readRun);
        sendFileThread.start();
}

and unfortunately i couldn't figure it out

[Tolls]

So?
What is happening at that point?
What is the system doing?
Does it hang?
Is it thrashing?

[awpad]

Yes it hangs.
and there is no way to start a new session except terminating the program by pressing end button
is there any way to extend size of bytes array ( I did , but didn't extend)
or might be the loop of do while

[Tolls]

Your logs should show you what's going on and where it is hanging.