Apache Mina实战

Mina介绍

Mina可以用于快速的开发基于网络通信的应用，特别是在开发手机端的游戏应用时，使用的较为普遍。本文简单介绍了一个用Mina搭建的一个简易讨论组，通过该应用可以对Mina的基本用法用途有个大致的了解。

界面效果

界面元素不多，使用了两个AWT组件。

客户端1：

客户端2：

服务端日志：

核心代码

服务端Handler

   1: /**

   2:  * <服务端消息Handler>

   3:  *

   4:  * @author liping.action@gmail.com

   5:  * @version V1.0

   6:  */

   7: public class ServerMessageHandler extends IoHandlerAdapter {

   8:     private MsgQueue msgQueueReceived;

   9:     private MsgQueue msgQueueSent;

10:

  11:     public MsgQueue getMsgQueueReceived() {

  12:         return msgQueueReceived;

  13:     }

14:

  15:     public void setMsgQueueReceived(MsgQueue msgQueueReceived) {

  16:         this.msgQueueReceived = msgQueueReceived;

  17:     }

18:

  19:     public MsgQueue getMsgQueueSent() {

  20:         return msgQueueSent;

  21:     }

22:

  23:     public void setMsgQueueSent(MsgQueue msgQueueSent) {

  24:         this.msgQueueSent = msgQueueSent;

  25:     }

26:

  27:     static {

  28:         PropertyConfigurator.configure(ClassLoader

  29:                 .getSystemResource("log4j.properties"));

  30:     }

  31:     private static Logger logger = Logger.getLogger(ServerMessageHandler.class);

32:

  33:     @Override

  34:     public void exceptionCaught(IoSession session, Throwable cause)

  35:             throws Exception {

  36:         logger.error(cause.toString());

  37:     }

38:

  39:     @Override

  40:     public void messageReceived(IoSession session, Object message)

  41:             throws Exception {

  42:         Msg msg = (Msg) message;

  43:         logger.info("MSG:from=" + session.getRemoteAddress() + ",id="

  44:                 + msg.getId() + ",content=" + msg.getContent());

  45:         Collection<IoSession> sessions = session.getService()

  46:                 .getManagedSessions().values();

  47:         msg.setId(session.getRemoteAddress().toString());

  48:         for (IoSession ioSession : sessions) {

  49:             ioSession.write(msg);

  50:         }

  51:     }

52:

  53:     @Override

  54:     public void messageSent(IoSession session, Object message) throws Exception {

  55:         logger.info(Constant.MESSAGE_SENT);

  56:     }

57:

  58:     @Override

  59:     public void sessionClosed(IoSession session) throws Exception {

  60:         logger.info(Constant.SESSION_CLOSED);

  61:     }

62:

  63:     @Override

  64:     public void sessionCreated(IoSession session) throws Exception {

  65:         logger.info(Constant.SESSION_CREATED);

  66:     }

67:

  68:     @Override

  69:     public void sessionIdle(IoSession session, IdleStatus status)

  70:             throws Exception {

  71:         logger.info(Constant.SESSION_IDLE);

  72:     }

73:

  74:     @Override

  75:     public void sessionOpened(IoSession session) throws Exception {

  76:         logger.info(Constant.SESSION_OPENED);

  77:         logger.info("address : "

  78:                 + session.getRemoteAddress());

  79:     }

80:

  81: }

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.csharpcode .lnum { color: #606060; }客户端handler

   1: /**

   2:  * <客户端handler>

   3:  *

   4:  * @author liping.action@gmail.com

   5:  * @version V1.0

   6:  */

   7: public class ClientMessageHanlder extends IoHandlerAdapter {

   8:     private static Logger logger = Logger.getLogger(ClientMessageHanlder.class);

   9:     private MsgModel msgModel;

10:

  11:     public MsgModel getMsgModel() {

  12:         return msgModel;

  13:     }

14:

  15:     public void setMsgModel(MsgModel msgModel) {

  16:         this.msgModel = msgModel;

  17:     }

18:

  19:     @Override

  20:     public void exceptionCaught(IoSession session, Throwable cause)

  21:             throws Exception {

  22:         super.exceptionCaught(session, cause);

  23:     }

24:

  25:     @Override

  26:     public void messageReceived(IoSession session, Object message)

  27:             throws Exception {

  28:         Msg msg = (Msg) message;

  29:         logger.info("msg:id=" + msg.getId() + ",content=" + msg.getContent());

  30:         msgModel.setMsg(msg);

  31:         msgModel.fireModelChange();//触发模型变更，通知观察者

  32:     }

33:

  34:     @Override

  35:     public void messageSent(IoSession session, Object message) throws Exception {

  36:         super.messageSent(session, message);

  37:     }

38:

  39:     @Override

  40:     public void sessionClosed(IoSession session) throws Exception {

  41:         super.sessionClosed(session);

  42:     }

43:

  44:     @Override

  45:     public void sessionCreated(IoSession session) throws Exception {

  46:         super.sessionCreated(session);

  47:     }

48:

  49:     @Override

  50:     public void sessionIdle(IoSession session, IdleStatus status)

  51:             throws Exception {

  52:         super.sessionIdle(session, status);

  53:     }

54:

  55:     @Override

  56:     public void sessionOpened(IoSession session) throws Exception {

  57:         Msg msg = new Msg(session.getRemoteAddress().toString(),

  58:                 session.getLocalAddress() + " " + DateUtil.getCurrentData() + " 进入了讨论组！");

  59:         session.write(msg);

  60:     }

  61: }

   1: /**

   2:  * 服务端启动器

   3:  *

   4:  */

   5: public class ServerLauncher {

   6:     static {

   7:         PropertyConfigurator.configure(ClassLoader

   8:                 .getSystemResource("log4j.properties"));

   9:     }

  10:     private static Logger logger = Logger.getLogger(ServerMessageHandler.class);

11:

  12:     public static void main(String[] args) {

  13:         // 创建一个非阻塞的server端Socket ，用NIO

  14:         SocketAcceptor acceptor = new NioSocketAcceptor();

  15:         // 创建接收数据的过滤器

  16:         DefaultIoFilterChainBuilder chain = acceptor.getFilterChain();

  17:         // 设定这个过滤器将以对象为单位读取数据

  18:         ProtocolCodecFilter filter = new ProtocolCodecFilter(

  19:                 new ObjectSerializationCodecFactory());

  20:         chain.addLast("objectFilter", filter);

  21:         // 设定服务器消息处理器

  22:         acceptor.setHandler(new ServerMessageHandler());

  23:         // 服务器绑定的端口

  24:         int bindPort = 9988;

  25:         // 绑定端口，启动服务器

  26:         try {

  27:             acceptor.bind(new InetSocketAddress(bindPort));

  28:         } catch (IOException e) {

  29:             logger.error(e.toString());

  30:         }

  31:         logger.info("Mina Server run done! on port:" + bindPort);

  32:     }

  33: }

客户端启动器：

   1: /**

   2:  * 客户端启动器

   3:  *

   4:  */

   5: public class ClientLauncher {

   6:     static {

   7:         PropertyConfigurator.configure(ClassLoader

   8:                 .getSystemResource("log4j.properties"));

   9:     }

10:

  11:     public static void main(String[] args) {

  12:         // 创建消息模型（被观察者）

  13:         MsgModel model = new MsgModel();

  14:         // 创建一个tcp/ip 连接

  15:         NioSocketConnector connector = new NioSocketConnector();

  16:         /*---------接收对象---------*/

  17:         // 创建接收数据的过滤器

  18:         DefaultIoFilterChainBuilder chain = connector.getFilterChain();

  19:         // 设定这个过滤器将以对象为单位读取数据

  20:         ProtocolCodecFilter filter = new ProtocolCodecFilter(

  21:                 new ObjectSerializationCodecFactory());

  22:         chain.addLast("objectFilter", filter);

  23:         ClientMessageHanlder hanlder = new ClientMessageHanlder();

  24:         hanlder.setMsgModel(model);

  25:         // 设定客户端端的消息处理器

  26:         connector.setHandler(hanlder);

  27:         // Set connect timeout.

  28:         connector.setConnectTimeoutCheckInterval(30);

  29:         // 连结到服务器:

  30:         final ConnectFuture cf = connector.connect(new InetSocketAddress(

  31:                 "127.0.0.1", 9988));

  32:         createComponent(model, cf);

  33:         cf.awaitUninterruptibly();

  34:         cf.getSession().getCloseFuture().awaitUninterruptibly();

  35:         connector.dispose();

  36:     }

37:

  38:     private static void createComponent(MsgModel model, final ConnectFuture cf) {

  39:         JFrame frame = new JFrame("Client");

  40:         frame.setLocation(450, 300);

  41:         final TextField textField = new TextField();

42:

  43:         textField.addKeyListener(new KeyListener() {

  44:             public void keyTyped(KeyEvent arg0) {

  45:             }

46:

  47:             public void keyReleased(KeyEvent arg0) {

  48:             }

49:

  50:             public void keyPressed(KeyEvent arg0) {

  51:                 if (arg0.getKeyCode() == KeyEvent.VK_ENTER) {

  52:                     String value = textField.getText();

  53:                     if (!value.equals("")) {

  54:                         Msg msg = new Msg("0002", value);

  55:                         cf.getSession().write(msg);

  56:                         textField.setText("");

  57:                     }

  58:                 }

  59:             }

  60:         });

  61:         // 自定义TextArea

  62:         CusTextArea textArea = new CusTextArea();

  63:         model.addObserver(textArea);

  64:         frame.setSize(300, 450);

  65:         frame.setResizable(false);

  66:         frame.setBackground(Color.white);

  67:         frame.add(textField, BorderLayout.SOUTH);

  68:         frame.add(textArea, BorderLayout.NORTH);

  69:         frame.pack();

  70:         frame.setVisible(true);

  71:         frame.addWindowListener(new CloseHandler(cf.getSession()));

  72:         textField.requestFocus();

  73:     }

  74: }

结语

该应用为一个简单的讨论组程序，可实现多人讨论，说白了是重复造轮子，但通过此应用可以对mima的用法及原理进行简单了解。程序还有其他代码没有贴上来，全部由三部分组成，服务端、客户端、公共组件。公共组件提供服务端、客户端公共使用的部分，如消息，消息队列，消息模型等。如需要程序源码，联系我的邮件获取。

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