使用mina 作代理服务器例子

import java.net.InetSocketAddress;

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

/**
 * (<b>Entry point</b>) Demonstrates how to write a very simple tunneling proxy
 * using MINA. The proxy only logs all data passing through it. This is only
 * suitable for text based protocols since received data will be converted into
 * strings before being logged.
 * <p>
 * Start a proxy like this:<br/>
 * <code>org.apache.mina.example.proxy.Main 12345 www.google.com 80</code><br/>
 * and open <a href="http://localhost:12345">http://localhost:12345</a> in a
 * browser window.
 * </p>
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev$, $Date$
 */
public class Main {

    public static void main(String[] args) throws Exception {
        if (args.length != 3) {
            System.out.println(Main.class.getName()
                    + " <proxy-port> <server-hostname> <server-port>");
            return;
        }

        // Create TCP/IP acceptor.
        NioSocketAcceptor acceptor = new NioSocketAcceptor();

        // Create TCP/IP connector.
        IoConnector connector = new NioSocketConnector();

        // Set connect timeout.
        connector.setConnectTimeoutMillis(30*1000L);

        ClientToProxyIoHandler handler = new ClientToProxyIoHandler(connector,
                new InetSocketAddress(args[1], Integer.parseInt(args[2])));

        // Start proxy.
        acceptor.setHandler(handler);
        acceptor.bind(new InetSocketAddress(Integer.parseInt(args[0])));

        System.out.println("Listening on port " + Integer.parseInt(args[0]));
    }

}

/**
 * Handles the server to proxy part of the proxied connection.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev$, $Date$
 *
 */
public class ServerToProxyIoHandler extends AbstractProxyIoHandler {
}

import java.nio.charset.Charset;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Base class of {@link org.apache.mina.core.service.IoHandler} classes which handle
 * proxied connections.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev$, $Date$
 *
 */
public abstract class AbstractProxyIoHandler extends IoHandlerAdapter {
    private static final Charset CHARSET = Charset.forName("iso8859-1");
    public static final String OTHER_IO_SESSION = AbstractProxyIoHandler.class.getName()+".OtherIoSession";

    private final Logger logger = LoggerFactory.getLogger(getClass());
    
    @Override
    public void sessionCreated(IoSession session) throws Exception {
        session.suspendRead();
        session.suspendWrite();
    }

    @Override
    public void sessionClosed(IoSession session) throws Exception {
        if (session.getAttribute( OTHER_IO_SESSION ) != null) {
            IoSession sess = (IoSession) session.getAttribute(OTHER_IO_SESSION);
            sess.setAttribute(OTHER_IO_SESSION, null);
            sess.close(false);
            session.setAttribute(OTHER_IO_SESSION, null);
        }
    }

    @Override
    public void messageReceived(IoSession session, Object message)
            throws Exception {
        IoBuffer rb = (IoBuffer) message;
        IoBuffer wb = IoBuffer.allocate(rb.remaining());
        rb.mark();
        wb.put(rb);
        wb.flip();
        ((IoSession) session.getAttribute(OTHER_IO_SESSION)).write(wb);
        rb.reset();
        logger.info(rb.getString(CHARSET.newDecoder()));
    }
}

import java.net.SocketAddress;

import org.apache.mina.core.RuntimeIoException;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.core.future.IoFutureListener;
import org.apache.mina.core.service.IoConnector;
import org.apache.mina.core.session.IoSession;

/**
 * Handles the client to proxy part of the proxied connection.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev$, $Date$
 *
 */
public class ClientToProxyIoHandler extends AbstractProxyIoHandler {
    private final ServerToProxyIoHandler connectorHandler = new ServerToProxyIoHandler();

    private final IoConnector connector;

    private final SocketAddress remoteAddress;

    public ClientToProxyIoHandler(IoConnector connector,
            SocketAddress remoteAddress) {
        this.connector = connector;
        this.remoteAddress = remoteAddress;
        connector.setHandler(connectorHandler);
    }

    @Override
    public void sessionOpened(final IoSession session) throws Exception {

        connector.connect(remoteAddress).addListener(new IoFutureListener<ConnectFuture>() {
            public void operationComplete(ConnectFuture future) {
                try {
                    future.getSession().setAttribute(OTHER_IO_SESSION, session);
                    session.setAttribute(OTHER_IO_SESSION, future.getSession());
                    IoSession session2 = future.getSession();
                    session2.resumeRead();
                    session2.resumeWrite();
                } catch (RuntimeIoException e) {
                    // Connect failed
                    session.close(true);
                } finally {
                	session.resumeRead();
                    session.resumeWrite();
                }
            }
        });
    }
}