MIna学习例子

一．MINA框架简介
MINA(Multipurpose Infrastructure for Network Applications)是用于开发高性能和高可用性的网络应用程序的基础框架。通过使用MINA框架可以可以省下处理底层I/O和线程并发等复杂工作，开发人员能够把更多的精力投入到业务设计和开发当中。MINA框架的应用比较广泛，应用的开源项目有Apache Directory、AsyncWeb、Apache Qpid、QuickFIX/J、Openfire、SubEthaSTMP、red5等。MINA框架当前稳定版本是1.1.6，最新的2.0版本目前已经发布了M1版本。
MINA框架的特点有：基于java NIO类库开发；采用非阻塞方式的异步传输；事件驱动；支持批量数据传输；支持TCP、UDP协议；控制反转的设计模式（支持Spring）；采用优雅的松耦合架构；可灵活的加载过滤器机制；单元测试更容易实现；可自定义线程的数量，以提高运行于多处理器上的性能；采用回调的方式完成调用，线程的使用更容易。

二．MINA框架的常用类
类NioSocketAcceptor用于创建服务端监听；
类NioSocketConnector用于创建客户端连接；
类IoSession用来保存会话属性和发送消息；
类IoHandlerAdapter用于定义业务逻辑，常用的方法有：
方法 定义
sessionCreated() 当会话创建时被触发
sessionOpened() 当会话开始时被触发
sessionClosed() 当会话关闭时被触发
sessionIdle() 当会话空闲时被触发
exceptionCaught() 当接口中其他方法抛出异常未被捕获时触发此方法
messageRecieved() 当接收到消息后被触发
messageSent() 当发送消息后被触发

三．服务端应用开发示例
　　所需jar包slf4j-api.jar、slf4j-jdk14.jar、MINA-core-2.0.0-M6.jar。

1）、首先定义一个业务逻辑处理器TimeServerHandler，继承自IoHandlerAdapter，实现的功能有：当客户端创建会话时会显示客户端设备的IP和端口；当客户端输入quit时结束会话；客户端输入其它内容时则向客户端发送当前时间。代码如下：

TimeServerHandler ：

import java.util.Date;

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

public class TimeServerHandler extends IoHandlerAdapter {

    public void sessionCreated(IoSession session) {
        // 显示客户端的ip和端口
        System.out.println(session.getRemoteAddress().toString()+"1111111111111");
    }

    @Override
    public void messageReceived(IoSession session, Object message)
            throws Exception {
        String str = message.toString();
        System.out.println("str:"+str);
        if (str.trim().equalsIgnoreCase("quit")) {
            session.close();
            // 结束会话return;
        }
        Date date = new Date();
        session.write(date.toString());
        // 返回当前时间的字符串
        System.out.println("Message written..."+"2222222222");
    }

    
}

MinaTimeServer：

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;

import org.apache.mina.core.service.IoAcceptor;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;

public class MinaTimeServer {

    private static final int PORT = 9123;// 定义监听端口

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub

        IoAcceptor acceptor = new NioSocketAcceptor();
        acceptor.getFilterChain().addLast("logger", new LoggingFilter());
        acceptor.getFilterChain().addLast("codec",new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8")))); // 指定编码过滤器
        acceptor.setHandler(new TimeServerHandler()); // 指定业务逻辑处理器
        acceptor.setDefaultLocalAddress(new InetSocketAddress(PORT)); // 设置端口号
        acceptor.bind();// 启动监听}
    }

}

2）、客户端代码：

TimeClientHandler：

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

public class TimeClientHandler extends IoHandlerAdapter{
    public TimeClientHandler() {}
    @Override
    public void messageReceived(IoSession session, Object message) throws Exception {
        System.out.println(message);// 显示接收到的消息
        }
}

MinaTimeClient：

import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketConnector;

public class MinaTimeClient {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        // 创建客户端连接器.
        NioSocketConnector connector = new NioSocketConnector();
        connector.getFilterChain().addLast( "logger", new LoggingFilter() );
        connector.getFilterChain().addLast( "codec", new ProtocolCodecFilter( new TextLineCodecFactory( Charset.forName( "UTF-8" ))));        //设置编码过滤器
        connector.setConnectTimeout(30);
        connector.setHandler(new TimeClientHandler());//设置事件处理器
        ConnectFuture cf = connector.connect(new InetSocketAddress("127.0.0.1", 9123));//建立连接
        cf.awaitUninterruptibly();//等待连接创建完成
        cf.getSession().write("hello");//发送消息
        cf.getSession().write("quit");//发送消息
        cf.getSession().getCloseFuture().awaitUninterruptibly();//等待连接断开
        connector.dispose();
    }

}

*MINA传输对象：

1）、建立两个工程代码组织如下：



传输对象：

UserInfo：

package Mina.Object;

public class UserInfo implements java.io.Serializable{
    private String name;
    private String QQNum;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getQQNum() {
        return QQNum;
    }
    public void setQQNum(String qQNum) {
        QQNum = qQNum;
    }
}

客户端代码：

package Mina.client;

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

import Mina.Object.UserInfo;

public class ClientHandler extends IoHandlerAdapter {
    private static ClientHandler samplMinaClientHandler = null;
    public static ClientHandler getInstances() {
        if (null == samplMinaClientHandler) {
            samplMinaClientHandler = new ClientHandler();
        }
        return samplMinaClientHandler;
    }

    private ClientHandler() {

    }

    public void sessionOpened(IoSession session) throws Exception {
        session.write("客户端与服务器的会话打开了……");
        UserInfo text=new UserInfo();
        text.setName("梅竹寒香");
        text.setQQNum("972341215");
        session.write(text);
    }

    public void sessionClosed(IoSession session) {
    }

    public void messageReceived(IoSession session, Object message)
            throws Exception {
    }

    public void messageSent(IoSession arg0, Object arg1) throws Exception {
        System.out.println("客户端已经向服务器发送了："+(String)arg1);
    }
}

MainClient：

package Mina.client;

import java.net.InetSocketAddress;

import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.serialization.ObjectSerializationCodecFactory;
import org.apache.mina.transport.socket.nio.NioSocketConnector;

public class MainClient {
    private static MainClient mainClient = null;
    NioSocketConnector connector = new NioSocketConnector();
    DefaultIoFilterChainBuilder chain = connector.getFilterChain();

    public static MainClient getInstances() {
        if (null == mainClient) {
            mainClient = new MainClient();
        }
        return mainClient;
    }

    private MainClient() {
        chain.addLast("myChin", new ProtocolCodecFilter(
                new ObjectSerializationCodecFactory()));
        connector.setHandler(ClientHandler.getInstances());
        connector.setConnectTimeout(30);
        ConnectFuture cf = connector.connect(new InetSocketAddress("localhost",
                8888));
    }

    public static void main(String args[]) {
        MainClient.getInstances();
    }
}

服务器端：

ServerHandler：

package Mina.server;

import org.apache.mina.core.filterchain.IoFilterAdapter;
import org.apache.mina.core.service.IoHandler;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;

import Mina.Object.UserInfo;

public class ServerHandler extends IoFilterAdapter implements IoHandler {
    private static ServerHandler samplMinaServerHandler = null;

    public static ServerHandler getInstances() {
        if (null == samplMinaServerHandler) {
            samplMinaServerHandler = new ServerHandler();
        }
        return samplMinaServerHandler;
    }

    private ServerHandler() {

    }

    // 当连接后打开时触发此方法，一般此方法与 sessionCreated 会被同时触发
    public void sessionOpened(IoSession session) throws Exception {
    }
    public void sessionClosed(IoSession session) {
    }
    public void messageReceived(IoSession session, Object message)
            throws Exception {    
        if (message instanceof UserInfo) {
            UserInfo text = (UserInfo) message;
            System.out.println("服务器接收到从客户端的姓名："+text.getName());
            System.out.println("服务器接收到从客户端的QQ："+text.getQQNum());
        } 
    }

    public void exceptionCaught(IoSession arg0, Throwable arg1)
            throws Exception {

    }

    // 当消息传送到客户端后触发
    public void messageSent(IoSession arg0, Object arg1) throws Exception {
        
    }

    // 当一个新客户端连接后触发此方法.
    public void sessionCreated(IoSession arg0) throws Exception {
        
    }

    // 当连接空闲时触发此方法.
    public void sessionIdle(IoSession arg0, IdleStatus arg1) throws Exception {
        
    }

}

MainServer：

package Mina.server;

import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.serialization.ObjectSerializationCodecFactory;
import org.apache.mina.transport.socket.SocketAcceptor;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;

public class MainServer {
    private static MainServer mainServer = null;
    private SocketAcceptor acceptor = new NioSocketAcceptor();
    private DefaultIoFilterChainBuilder chain = acceptor.getFilterChain();
    private int bindPort = 8888;

    public static MainServer getInstances() {
        if (null == mainServer) {
            mainServer = new MainServer();
        }
        return mainServer;
    }

    private MainServer() {
        chain.addLast("myChin", new ProtocolCodecFilter(
                new ObjectSerializationCodecFactory()));
        acceptor.setHandler(ServerHandler.getInstances());
        try {
            acceptor.bind(new InetSocketAddress(bindPort));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws Exception {
        MainServer.getInstances();
    }
}