要实现Apache Mina客户端的公钥认证，以下是一个简单的代码示例：

1. 首先，创建一个客户端类，用于与服务器建立连接和进行认证。例如，可以创建一个名为Client的类：

import org.apache.mina.core.service.IoConnector;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.transport.socket.nio.NioSocketConnector;

public class Client {
    private static final String HOSTNAME = "localhost";
    private static final int PORT = 8080;

    public static void main(String[] args) {
        IoConnector connector = new NioSocketConnector();
        connector.setHandler(new ClientHandler());

        // 设置SSL加密
        SslFilter sslFilter = new SslFilter(createSslContext());
        connector.getFilterChain().addFirst("sslFilter", sslFilter);

        // 连接服务器
        IoSession session = connector.connect(new InetSocketAddress(HOSTNAME, PORT)).awaitUninterruptibly().getSession();

        // 进行公钥认证
        PublicKey publicKey = getPublicKeyFromServer(); // 从服务器获取公钥
        session.write(publicKey);

        // 继续其他操作...
    }

    private static SSLContext createSslContext() {
        try {
            KeyStore ks = KeyStore.getInstance("JKS");
            ks.load(new FileInputStream("keystore.jks"), "password".toCharArray());

            KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            kmf.init(ks, "password".toCharArray());

            TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            tmf.init(ks);

            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);

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

        return null;
    }

    private static PublicKey getPublicKeyFromServer() {
        // 从服务器获取公钥的逻辑
        // 这里只是示例，具体逻辑需要根据实际情况实现

        return publicKey;
    }
}

2. 创建一个客户端处理器类，用于处理与服务器的通信。例如，可以创建一个名为ClientHandler的类：

import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;

public class ClientHandler extends IoHandlerAdapter {
    @Override
    public void sessionOpened(IoSession session) throws Exception {
        System.out.println("与服务器建立连接");
        super.sessionOpened(session);
    }

    @Override
    public void sessionClosed(IoSession session) throws Exception {
        System.out.println("与服务器断开连接");
        super.sessionClosed(session);
    }

    @Override
    public void messageReceived(IoSession session, Object message) throws Exception {
        System.out.println("接收到服务器的消息：" + message);
        super.messageReceived(session, message);
    }
}

3. 创建一个包含公钥的服务器端代码，用于提供公钥给客户端。例如，可以创建一个名为Server的类：

import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;

public class Server {
    private static final int PORT = 8080;

    public static void main(String[] args) {
        try {
            IoAcceptor acceptor = new NioSocketAcceptor();
            acceptor.setHandler(new ServerHandler());

            // 设置SSL加密
            SslFilter sslFilter = new SslFilter(createSslContext());
            acceptor.getFilterChain().addFirst("sslFilter", sslFilter);

            // 启动服务器
            acceptor.bind(new InetSocketAddress(PORT));

            System.out.println("服务器已启动，监听端口：" + PORT);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static SSLContext createSslContext() {
        try {
            KeyStore ks = KeyStore.getInstance("JKS");
            ks.load(new FileInputStream("keystore.jks"), "password".toCharArray());

            KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            kmf.init(ks, "password".toCharArray());

            TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            tmf.init(ks);

            SSLContext sslContext = SSLContext.getInstance("TLS");
            ssl