apache mina (异步连接框架)实例
一、介绍
mina(Multipurpose Infrastructure for Network Applications) 是apache的顶级项目之一，用于构造异步连接的各种网络应用
二、最简单的使用实例

package aicu.mina;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;

import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoAcceptor;
import org.apache.mina.common.SimpleByteBufferAllocator;
import org.apache.mina.filter.LoggingFilter;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.transport.socket.nio.SocketAcceptor;
import org.apache.mina.transport.socket.nio.SocketAcceptorConfig;

public class MinaTimeServer {

    private static final int PORT = 9123;

    public static void main(String[] args) throws IOException {
        //设置buffer
        ByteBuffer.setUseDirectBuffers(false);
        ByteBuffer.setAllocator(new SimpleByteBufferAllocator());
        //定义acceptor
        IoAcceptor acceptor = new SocketAcceptor();
        //定义config
        SocketAcceptorConfig cfg = new SocketAcceptorConfig();
        //设置config,加入filter
        cfg.getSessionConfig().setReuseAddress( true );
        cfg.getFilterChain().addLast( "logger", new LoggingFilter() );
        cfg.getFilterChain().addLast( "codec", new ProtocolCodecFilter( new TextLineCodecFactory( Charset.forName( "UTF-8" ))));
        //加入port handler cfg
        acceptor.bind( new InetSocketAddress(PORT), new TimeServerHandler(), cfg);
        System.out.println("MINA Time server started.");
     }
 }

对应的handler ,handler的作用是在对应的网事件的处理代码

package aicu.mina;
import java.util.Date;

import org.apache.mina.common.IdleStatus;
import org.apache.mina.common.IoHandlerAdapter;
import org.apache.mina.common.IoSession;
import org.apache.mina.common.TransportType;
import org.apache.mina.transport.socket.nio.SocketSessionConfig;

public class TimeServerHandler extends IoHandlerAdapter {
    public void exceptionCaught(IoSession session, Throwable t) throws Exception {
        t.printStackTrace();
        session.close();
     }

    public void messageReceived(IoSession session, Object msg) throws Exception {
        String str = msg.toString();
        //如果是quit就关闭session退出
        if( str.trim().equalsIgnoreCase("quit") ) {
            session.close();
            return;
         }
        //否则打印当前日期
        Date date = new Date();
        session.write( date.toString() );
        System.out.println("Message written");
     }

    public void sessionCreated(IoSession session) throws Exception {
        System.out.println("Session created");

        if( session.getTransportType() == TransportType.SOCKET )
            ((SocketSessionConfig) session.getConfig() ).setReceiveBufferSize( 2048 );

        session.setIdleTime( IdleStatus.BOTH_IDLE, 10 );
     }
 }

三、使用方法：
编译上边两个类（需要加入mina的jar文件)，然后运行terminalServer
开始->运行->cmd进入控制台
telnet 127.0.0.1 9123
输入hello
得到当前日期
输入quit关闭session。