原文地址 http://blog.sina.com.cn/s/blog_720bdf0501010b8r.html
貌似java的IO、NIO的入门例子都有相关的Time Server Demo。本例为MINA官方Demo翻译过来而已。
MINA百科:
Apache MINA(Multipurpose Infrastructure for Network Applications) 是 Apache 组织一个较新的项目,它为开发高性能和高可用性的网络应用程序提供了非常便利的框架。当前发行的 MINA 版本支持基于 Java NIO 技术的 TCP/UDP 应用程序开发、串口通讯程序(只在最新的预览版中提供),MINA 所支持的功能也在进一步的扩展中。
目前正在使用 MINA 的软件包括有:Apache Directory Project、AsyncWeb、AMQP(Advanced Message Queuing Protocol)、RED5 Server(Macromedia Flash Media RTMP)、ObjectRADIUS、Openfire 等等。
目前最新版本为2.02 Release,官方网站为:http://mina.apache.org/。
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。
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
Time Server测试示例:
测试环境:Eclipse,jdk1.6,所需jar包,slf4j-api-1.5.11.jar、slf4j-jdk14-1.5.2.jar、mina-core-2.0.2.jar。
1、服务器端:
1)服务器Server代码:
package org.apache.mina.example.gettingstarted.timeserver; 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 {
private static final int PORT = 9123; public static void main(String[] args) throws IOException {
// 创建服务器监听 IoAcceptor acceptor = new NioSocketAcceptor(); // 增加日志过滤器 acceptor.getFilterChain().addLast( "logger", new LoggingFilter() );
//增加编码过滤器 acceptor.getFilterChain().addLast( "codec", new ProtocolCodecFilter( new TextLineCodecFactory( Charset.forName( "UTF-8" )))); //指定业务逻辑处理器 acceptor.setHandler( new TimeServerHandler() ); // 设置buffer的长度 acceptor.getSessionConfig().setReadBufferSize( 2048 ); //设置连接超时时间
acceptor.getSessionConfig().setIdleTime( IdleStatus.BOTH_IDLE, 10 ); // 绑定端口 acceptor.bind( new InetSocketAddress(PORT) );
}
}
2)业务逻辑处理器代码:
package org.apache.mina.example.gettingstarted.timeserver; 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
{ //连接异常时处理方法
@Override
public void exceptionCaught( IoSession session, Throwable cause ) throws Exception
{
cause.printStackTrace();
} @Override
public void messageReceived( IoSession session, Object message ) throws Exception
{
String str = message.toString(); if( str.trim().equalsIgnoreCase("quit") ) {
session.close(true);
return;
} Date date = new Date();
session.write( date.toString() );
System.out.println("Message written...");
} @Override
public void sessionIdle( IoSession session, IdleStatus status ) throws Exception
{
System.out.println( "IDLE " + session.getIdleCount( status ));
}
}
2、客户端测试代码
1)客户端代码
package com.kdiller.mina; 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 {
public static void main(String[] args) {
// 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();
}
}
2)客户端处理器
package com.kdiller.mina; import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
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("messageReceived method was called!");
System.out.println(message);// 显示接收到的消息
} @Override
public void exceptionCaught(IoSession session, Throwable cause)
throws Exception {
// TODO Auto-generated method stub
super.exceptionCaught(session, cause);
} @Override
public void messageSent(IoSession session, Object message) throws Exception {
// TODO Auto-generated method stub
super.messageSent(session, message);
System.out.println("messageSent method was called!");
System.out.println(message);
} @Override
public void sessionClosed(IoSession session) throws Exception {
// TODO Auto-generated method stub
super.sessionClosed(session);
System.out.println("sessionClosed method was called!");
} @Override
public void sessionCreated(IoSession session) throws Exception {
// TODO Auto-generated method stub
super.sessionCreated(session);
System.out.println("sessionCreated method was called!");
} @Override
public void sessionIdle(IoSession session, IdleStatus status)
throws Exception {
// TODO Auto-generated method stub
super.sessionIdle(session, status);
} @Override
public void sessionOpened(IoSession session) throws Exception {
// TODO Auto-generated method stub
super.sessionOpened(session);
System.out.println("sessionOpened method was called!");
} }