mina解包和发包

解包：

protected boolean doDecode(IoSession session, IoBuffer in,
   ProtocolDecoderOutput out) throws Exception {
  //System.out.println("**********          AMF3Decoder      *************");

 while(in.remaining() > 4){//有数据时，读取4字节判断消息长度 
 in.mark();
        int size = in.getInt();  
         if(size > in.remaining()){//如果消息内容不够，则重置，相当于不读取size  
                in.reset();  
                System.out.println("粘包");
                return false;//接收新数据，以拼凑成完整数据  
            } 
            else
            {
             byte bytes[] = new byte[size];
             in.get(bytes, 0, size);
             IoBuffer tempIn = IoBuffer.wrap(bytes);
             
           amf3in.setInputStream(new InflaterInputStream(new DataInputStream(tempIn.asInputStream())));
        try {
         Object message = amf3in.readObject();
         out.write(message);
         in.free();
    } catch (Exception e) {
      in.reset(); 
      System.out.println("粘包 Exception size:" +size +" in.remaining():"+in.remaining());
      return false;
    }
            }
        }  
  if(in.remaining()==0)
   return true;//处理成功，让父类进行接收下个包  
  else
   return false;
 }

发包：

public void encode(IoSession session, Object message,ProtocolEncoderOutput out) throws Exception 
 {
  //System.out.println("**********          AMF3Encoder      *************");
  if(message instanceof String)
  {
   byte[] bytes = ((String) message).getBytes("UTF-8");
   IoBuffer buffer = IoBuffer.allocate(bytes.length+1);
   buffer.put(bytes);
   buffer.put((byte) 0x0);//要在末尾写入0,表示一个流信息的结束
   buffer.flip();
   out.write(buffer);
   buffer.free();// 清空?
   buffer.clear();
  }
  else
  {
   IoBuffer buffer;
   
   ByteArrayOutputStream stream = new ByteArrayOutputStream();
   amf3out.setOutputStream(stream);
   amf3out.writeObject(message);
   amf3out.flush();

   byte bytes[] = stream.toByteArray();  
   //byte bytes[] = compress(session,stream.toByteArray());  
   buffer = IoBuffer.allocate(bytes.length+4,false);//创建缓存
   buffer.putInt(bytes.length);//总长度
   //System.out.println(bytes.length);
   buffer.put(bytes);//内容
   buffer.flip();
   out.write(buffer);
   buffer.free();// 清空?
  } 
 }