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

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）