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:
1 package org.apache.mina.example.gettingstarted.timeserver; 2 3 import java.util.Date; 4 5 import org.apache.mina.core.service.IoHandlerAdapter; 6 import org.apache.mina.core.session.IdleStatus; 7 import org.apache.mina.core.session.IoSession; 8 9 public class TimeServerHandler extends IoHandlerAdapter 10 { 11 12 //连接异常时处理方法 13 @Override 14 public void exceptionCaught( IoSession session, Throwable cause ) throws Exception 15 { 16 cause.printStackTrace(); 17 } 18 19 20 @Override 21 public void messageReceived( IoSession session, Object message ) throws Exception 22 { 23 String str = message.toString(); 24 25 if( str.trim().equalsIgnoreCase("quit") ) { 26 session.close(true); 27 return; 28 } 29 30 Date date = new Date(); 31 session.write( date.toString() ); 32 System.out.println("Message written..."); 33 } 34 35 36 @Override 37 public void sessionIdle( IoSession session, IdleStatus status ) throws Exception 38 { 39 System.out.println( "IDLE " + session.getIdleCount( status )); 40 } 41 }
2、客户端测试代码
1)客户端代码
1 package com.kdiller.mina; 2 3 import java.net.InetSocketAddress; 4 import java.nio.charset.Charset; 5 6 import org.apache.mina.core.future.ConnectFuture; 7 import org.apache.mina.filter.codec.ProtocolCodecFilter; 8 import org.apache.mina.filter.codec.textline.TextLineCodecFactory; 9 import org.apache.mina.filter.logging.LoggingFilter; 10 import org.apache.mina.transport.socket.nio.NioSocketConnector; 11 12 public class MinaTimeClient { 13 public static void main(String[] args) { 14 // 创建客户端连接器. 15 NioSocketConnector connector = new NioSocketConnector(); 16 connector.getFilterChain().addLast("logger", new LoggingFilter()); 17 connector.getFilterChain().addLast( 18 "codec", 19 new ProtocolCodecFilter(new TextLineCodecFactory(Charset 20 .forName("UTF-8")))); // 设置编码过滤器 21 connector.setConnectTimeout(30); 22 connector.setHandler(new TimeClientHandler());// 设置事件处理器 23 ConnectFuture cf = connector.connect(new InetSocketAddress("127.0.0.1", 24 9123));// 建立连接 25 cf.awaitUninterruptibly();// 等待连接创建完成 26 cf.getSession().write("hello");// 发送消息 27 cf.getSession().write("quit");// 发送消息 28 cf.getSession().getCloseFuture().awaitUninterruptibly();// 等待连接断开 29 connector.dispose(); 30 } 31 }
2)客户端处理器
1 package com.kdiller.mina; 2 3 import org.apache.mina.core.service.IoHandlerAdapter; 4 import org.apache.mina.core.session.IdleStatus; 5 import org.apache.mina.core.session.IoSession; 6 7 public class TimeClientHandler extends IoHandlerAdapter { 8 public TimeClientHandler() { 9 } 10 11 @Override 12 public void messageReceived(IoSession session, Object message) 13 throws Exception { 14 System.out.println("messageReceived method was called!"); 15 System.out.println(message);// 显示接收到的消息 16 } 17 18 @Override 19 public void exceptionCaught(IoSession session, Throwable cause) 20 throws Exception { 21 // TODO Auto-generated method stub 22 super.exceptionCaught(session, cause); 23 } 24 25 @Override 26 public void messageSent(IoSession session, Object message) throws Exception { 27 // TODO Auto-generated method stub 28 super.messageSent(session, message); 29 System.out.println("messageSent method was called!"); 30 System.out.println(message); 31 } 32 33 @Override 34 public void sessionClosed(IoSession session) throws Exception { 35 // TODO Auto-generated method stub 36 super.sessionClosed(session); 37 System.out.println("sessionClosed method was called!"); 38 } 39 40 @Override 41 public void sessionCreated(IoSession session) throws Exception { 42 // TODO Auto-generated method stub 43 super.sessionCreated(session); 44 System.out.println("sessionCreated method was called!"); 45 } 46 47 @Override 48 public void sessionIdle(IoSession session, IdleStatus status) 49 throws Exception { 50 // TODO Auto-generated method stub 51 super.sessionIdle(session, status); 52 } 53 54 @Override 55 public void sessionOpened(IoSession session) throws Exception { 56 // TODO Auto-generated method stub 57 super.sessionOpened(session); 58 System.out.println("sessionOpened method was called!"); 59 } 60 61 }