线程/套接字和MySql（Java）的问题

我的Java老师进行的练习对我有很大的问题。从理论上讲，练习必须具有以下几点：

-套接字-客户端-服务器-服务器使用MySql做某些事情-登录-Md5保存密码​​-安全套接字

有了这个，我决定进行理论上的聊天应该是一件容易的事，但是……我完全迷失了。

我或多或少地制作了基础（安全套接字，服务器，客户端），但即使这样也不起作用，但从理论上讲，IDE绝对不会失败。

有人可以帮我吗？

代码如下：

ChatClient使客户端工作，并加载界面和功能：

public class ChatClient 
{


    private Socket s;

    private ClientPanel panel;


    public static void main(String[] args) 
    {
        new ChatClient();
    }

    public ChatClient()
    {
        try
        {
            Window();
            s = new Socket("localhost" , 5557);
            ClientControl control = new ClientControl(s, panel);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    private void Window()
    {
        JFrame v = new JFrame();
        panel = new PanelCliente(v.getContentPane());
        v.pack();
        v.setVisible(true);
        v.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

ServerChat可以使用安全套接字创建服务器聊天，这是练习的必要条件之一：

public class ServerChat extends Thread
{
    public static void main(String[] args) 
    {
            int port= 5090;

            SSLServerSocketFactory sslserver = (SSLServerSocketFactory) SSLServerSocketFactory.getDefault();
            try 
            {
                SSLServerSocket sslsocket = (SSLServerSocket)sslserver.createServerSocket();

                InetSocketAddress socketAddress = new InetSocketAddress("localhost" , port);

                while(true)
                    {

                        SSLSocket socket = (SSLSocket)sslsocket.accept();
                        System.out.println("Client:  " + socket.getInetAddress().getHostName() + " Conected");

                    }   
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            }           

    }

}


public class ClientControl implements ActionListener, Runnable
{

    private DataInputStream dataInput;

    private DataOutputStream dataOutput;

    private ClientPanel panel;

    public ClientControl (Socket s, ClientPanel panel)
    {
        this.panel = panel;

        try
        {
            dataInput = new DataInputStream(s.getInputStream());
            dataOutput = new DataOutputStream(s.getOutputStream());
            panel.addActionListener(this);
            Thread t = new Thread(this);
            t.start();

        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public void actionPerformed (ActionEvent event)
    {
        try
        {
            dataOutput.writeUTF(panel.getTexto());
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    public void run()
    {
        try
        {
            String text = dataInput.readUTF();
            panel.addTexto(text);
            panel.addTexto("\n");

        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

}

从理论上讲，客户端线程可以使客户端作为线程运行并实现其功能：

public class ClientThread implements Runnable, ListDataListener
{

    private DefaultListModel conversation;

    private Socket s;

    private DataInputStream dataInput;

    private DataOutputStream dataOutput;

    public ClientThread (DefaultListModel conversation, Socket s)
    {
        this.conversation = conversation;
        this.s = s;

        try
        {
            dataInput = new DataInputStream(s.getInputStream());
            dataOutput = new DataOutputStream(s.getOutputStream());
            conversation.addListDataListener(this);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public void run()
    {
        try
        {
            while (true)
            {
                String text = dataInput.readUTF();
                System.out.println(text);
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public void intervalAdded(ListDataEvent e)
    {
        String text = (String) conversation.getElementAt(e.getIndex0());

        try
        {
            dataOutput.writeUTF(text);
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }

    @Override
    public void contentsChanged(ListDataEvent arg0) 
    {
    }

    @Override
    public void intervalRemoved(ListDataEvent arg0) 
    {   
    }
}

下面的“客户端面板”基本上是使用JSwing做一个简单的设计，以创建和连接您可以看到对话的界面，您可以编写所需的任何内容：

public class ClientPanel
{

    private JScrollPane scroll;

    private JTextArea textArea;

    private JTextField textField;

    private JButton button;


    public ClientPanel(Container cont)
    {
        cont.setLayout(new BorderLayout());
        textArea = new JTextArea();
        scroll = new JScrollPane(textArea);

        JPanel panel = new JPanel(new FlowLayout());
        textField = new JTextField(50);
        button = new JButton("Send");
        panel.add(textField);
        panel.add(button);

        cont.add(scroll, BorderLayout.CENTER);
        cont.add(panel, BorderLayout.SOUTH);
    }

    public void addActionListener (ActionListener action)
    {
        textField.addActionListener(action);
        button.addActionListener(action);
    }

    public void addTexto (String text)
    {
        textArea.append(text);
    }

    public String getTexto()
    {
        String text = textField.getText();
        textField.setText(text);
        return text;
    }
}

如何将数据库添加到“登录用户”？如何在其中添加Md5以保护密码？我如何才能使所有这些一起工作？

那是我的问题