Mina使用IoBuffer读取字节的问题

ogiso_pest 2012-04-06 04:00:25

问题描述：
使用telnet localhost 3005
输入123456
在console里显示：
服务端与客户端创建连接...
服务端与客户端连接打开...
b:49
b:50
b:51
b:52
b:53
b:54
rrrr
nnnnn
Msg:
服务端接收到的数据为：
Encode:Fri Apr 06 15:57:03 CST 2012
服务端发送信息成功...

为什么Msg为空呢？

这个是服务器端：

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.LineDelimiter;

import org.apache.mina.filter.codec.textline.TextLineCodecFactory;

import org.apache.mina.transport.socket.nio.NioSocketAcceptor;



public class Demo1Server {



	private static int PORT = 3005;



	public static void main(String[] args) {

		IoAcceptor acceptor = null;

		try {

			// 创建一个非阻塞的server端的Socket

			acceptor = new NioSocketAcceptor();

			// 设置过滤器（使用Mina提供的文本换行符编解码器）

//			acceptor.getFilterChain().addLast(

//					"codec",

//					new ProtocolCodecFilter(new TextLineCodecFactory(Charset

//							.forName("UTF-8"),

//							LineDelimiter.WINDOWS.getValue(),

//							LineDelimiter.WINDOWS.getValue())));

			acceptor.getFilterChain().addLast(

					"codec",

			new ProtocolCodecFilter(new MyTextLineCodecFactory()));



			// 设置读取数据的缓冲区大小

			acceptor.getSessionConfig().setReadBufferSize(2048);

			// 读写通道10秒内无操作进入空闲状态

			acceptor.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, 10);

			// 绑定逻辑处理器

			acceptor.setHandler(new Demo1ServerHandler());

			// 绑定端口

			acceptor.bind(new InetSocketAddress(PORT));

			

		} catch (Exception e) {

			e.printStackTrace();

		}

	}

}

这个是filter类，过滤掉回车换行符号

import java.nio.charset.CharacterCodingException;

import java.nio.charset.Charset;





import org.apache.mina.core.buffer.IoBuffer;

import org.apache.mina.core.session.IoSession;

import org.apache.mina.filter.codec.ProtocolDecoder;

import org.apache.mina.filter.codec.ProtocolDecoderOutput;



public class MyTextLineCodecDecoder implements ProtocolDecoder {



	private Charset charset = Charset.forName("UTF-8");



	IoBuffer buf = IoBuffer.allocate(100).setAutoExpand(true);



	public static byte [] ioBufferToByte(Object message)  

	{  

	      if (!(message instanceof IoBuffer))  

	      {  

	          return null;  

	      }  

	      IoBuffer ioBuffer = (IoBuffer)message;  

	      byte[] b = new byte[ioBuffer.limit()];  

	      ioBuffer.get(b);  

	      return b;  

	}  

	

	@Override

	public void decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out)

			throws Exception {

		// TODO Auto-generated method stub



		while (in.hasRemaining()) {

			byte b = in.get();

			switch (b){

				case '\r':

					System.out.println("rrrr");

					break;

				case '\n':

					System.out.println("nnnnn");

					buf.flip();

					String msg = buf.getString(charset.newDecoder());

					System.out.println("Msg:"+msg);

					out.write(msg);

					break;

				default:

					System.out.println("b:"+b);

					buf.put(b);

			}

				

		}



		

	}



	@Override

	public void dispose(IoSession arg0) throws Exception {

		// TODO Auto-generated method stub

		

	}



	@Override

	public void finishDecode(IoSession arg0, ProtocolDecoderOutput arg1)

			throws Exception {

		// TODO Auto-generated method stub

		

	}	

}

Handler类



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 Demo1ServerHandler extends IoHandlerAdapter {



	@Override

	public void sessionCreated(IoSession session) throws Exception {

		System.out.println("服务端与客户端创建连接...");

	}



	@Override

	public void sessionOpened(IoSession session) throws Exception {

		System.out.println("服务端与客户端连接打开...");

	}



	@Override

	public void messageReceived(IoSession session, Object message)

			throws Exception {

		String msg = message.toString();

		System.out.println("服务端接收到的数据为：" + msg);

		if ("bye".equals(msg)) { // 服务端断开连接的条件

			session.close(true);

		}

		Date date = new Date();

		session.write(date);

	}



	@Override

	public void messageSent(IoSession session, Object message) throws Exception {

		System.out.println("服务端发送信息成功...");

	}



	@Override

	public void sessionClosed(IoSession session) throws Exception {



	}



	@Override

	public void sessionIdle(IoSession session, IdleStatus status)

			throws Exception {

		System.out.println("服务端进入空闲状态...");

	}



	@Override

	public void exceptionCaught(IoSession session, Throwable cause)

			throws Exception {

		System.out.println("服务端发送异常...");

	}

}