Mina框架学习笔记（一）

Apache MINA is a network application framework which helps users develop high performance and high scalability network applications easily. It provides an abstract · event-driven · asynchronous API over various transports such as TCP/IP and UDP/IP via Java NIO.

Apache MINA is often called:

NIO framework · library,
client · server framework · library, or
a networking · socket library.
On Saturday, 25 September 2010, the Apache MINA project is pleased to announce MINA 2.0.0 ! This version fixes many issues found since we released 2.0.0-RC1.

We recommend all users to upgrade to this release. We consider this a stable and production ready release.

这是官方网上的说明。

其实之前已经学过Mina了，但现在也忘得差不多了，趁Apache发布新版本的时候，学一学新版本上的东西，顺便复习一下以前学过的知识。

本文是入门篇，先来写一个简单的socket server服务器程序，可以用telnet来连接，当服务器收到客户端的连接时会把服务器上的时间返回给客户。

首先引入四个包：

mina-core-2.0.0.jar

slf4j-api-1.6.1.jar

slf4j-jdk14-1.6.1.jar

slf4j-log4j12-1.6.1.jar

接着创建一个主服务类：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.core.session.IdleStatus;  
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 {  
    public static void main(String[] args) throws IOException {  
        IoAcceptor acceptor = new NioSocketAcceptor();  
          
        //This filter will log all information such as newly created   
            //sessions, messages received, messages sent, session closed  
        acceptor.getFilterChain().addLast("logger", new LoggingFilter());  
        //This filter will translate binary or protocol specific data into   
            //message object and vice versa. We use an existing TextLine   
            //factory because it will handle text base message for you (  
            //you don't have to write the codec part)  
        acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(  
                new TextLineCodecFactory(Charset.forName("UTF-8"))));  
          
        acceptor.setHandler(new TimeServerHandler());  
          
        acceptor.getSessionConfig().setReadBufferSize(BUF_SIZE);  
        //the first parameter defines what actions to check for when   
            //determining if a session is idle, the second parameter defines   
            //the length of time in seconds that must occur before a session   
            //is deemed to be idle.  
        acceptor.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, 10);  
          
        acceptor.bind(new InetSocketAddress(PORT));  
    }  
    private static final int PORT = 8181,BUF_SIZE = 2048;  
}  
 

再创建一个handler来管理事件

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package mina;  
import java.util.Date;  
import org.apache.mina.core.service.IoHandlerAdapter;  
import org.apache.mina.core.session.IdleStatus;  
import org.apache.mina.core.session.IoSession;  
public class TimeServerHandler extends IoHandlerAdapter {  
    @Override  
    public void exceptionCaught(IoSession session, Throwable cause)  
            throws Exception {  
        cause.printStackTrace();  
    }  
    @SuppressWarnings("deprecation")  
    @Override  
    public void messageReceived(IoSession session, Object message)  
            throws Exception {  
        String str = message.toString();  
        System.out.println("Message received:"+str);  
        if(str.trim().equalsIgnoreCase("quit")){  
            session.close();  
            return;  
        }  
          
        Date date = new Date();  
        session.write(date.toString());  
        System.out.println("Message written.");  
    }  
    @Override  
    public void messageSent(IoSession session, Object message) throws Exception {  
        super.messageSent(session, message);  
    }  
    @Override  
    public void sessionClosed(IoSession session) throws Exception {  
        super.sessionClosed(session);  
    }  
    @Override  
    public void sessionCreated(IoSession session) throws Exception {  
        super.sessionCreated(session);  
    }  
    @Override  
    public void sessionIdle(IoSession session, IdleStatus status)  
            throws Exception {  
        System.out.println("IDLE"+session.getIdleCount(status));  
    }  
    @Override  
    public void sessionOpened(IoSession session) throws Exception {  
        // TODO Auto-generated method stub  
        super.sessionOpened(session);  
    }  
      
}  

运行MinaTimeServer，再用telnet来连接，命令格式如：telnet 127.0.0.1 8181

（第一节结束，第二节待续）