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Код


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class test extends JFrame{

    public static void main(String[] args) {
        new test();
    }
    
    public test()
    {
     super("Регистрация");
     
     addWindowListener(new WindowAdapter(){
         public void windowClosing(WindowEvent e) { 
                System.exit(0); 
            } 
     });
     setSize(300,200);
     setLocationRelativeTo(null);
     
     Container contentPane = getContentPane();
     
     //add TextArea
     
     final JTextArea out =new JTextArea();
     
     mainPanel=new JPanel();
     mainPanel.setLayout(new GridLayout(0,2));
     contentPane.add(mainPanel, BorderLayout.NORTH);
     
     final JFormattedTextField server=new JFormattedTextField("192.168.0.1");
     addLabelEdit("Адрес Сервера :",server);
     
     final JFormattedTextField login=new JFormattedTextField("log");
     addLabelEdit("Логин :",login);
     
     final JFormattedTextField password=new JFormattedTextField("123");
     addLabelEdit("Пароль :",password);
     
     //add buttonPanel
     
     JPanel buttonPanel=new JPanel();
     
     addButton(buttonPanel,"Регистрация",new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                // отправка данных на сервер логина пароля и т.д.
                Object value = server.getValue();
                Object value1 = login.getValue();
                Object value2 = password.getValue();
                out.setText(value.toString()+"\n"+value1.toString()+"\n"+value2.toString());
            }});
     addButton(buttonPanel,"Проверить логин",new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                //отправка логина на сервер, для проверки на совместимость его в базе
                Object value = login.getValue();
                out.setText(value.toString());
            }});
     
     contentPane.add(out,BorderLayout.CENTER);
     contentPane.add(buttonPanel,BorderLayout.SOUTH);
     
     show(); 
    }
    
    public void addButton(Container c, String title,ActionListener listener)
    {
     JButton button=new JButton(title);
     button.addActionListener(listener);
     c.add(button);
    }
    
    public void addLabelEdit(final String labelText,final JFormattedTextField field)
    {
     mainPanel.add(new JLabel(labelText));
     mainPanel.add(field);
    }
    
    private JPanel mainPanel;
}

Код


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

public class test2 {

    public static void main(String[] args) {
        try
        {
            int i=1;
            ServerSocket s=new ServerSocket(8190);
            while(true)
            {
             Socket client=s.accept();
             System.out.println("User:"+i);
             Thread t=new ConnectionOfClient(client,i);
             t.start();
             i++;
            }    
        }
        catch(IOException e){e.printStackTrace();}
    }

}

// соединение с i-м клиентом 
class ConnectionOfClient extends Thread
{
    public ConnectionOfClient(Socket s,int i)
    {
        client=s; counter=i;
    }
    
    public void run()
    {
        try
        {
            
            InputStream inStream=client.getInputStream();
            OutputStream outStream=client.getOutputStream();
            
            Scanner in=new Scanner(inStream);
            PrintWriter out=new PrintWriter(outStream,true);
            
//             if(меткаLOG){проверки логина в БД}
//             else if (меткаREG){вставки данных в БД}
            
            client.close();
        }
        catch(IOException e)
        {e.printStackTrace();}
    }
    
    private Socket client;
    private int counter;
}