web.xml中的filterMina的底层依赖的主要是Ja(33)

因为客户端发送的SendMessage 的前两个字节（char）就是符号位，所以我们在decodable()方法中对此条件进行了判断，之后读到两个字节，并且这两个字节表示的字符是+时，才认为这个可用。

(5.)服务端使用的SendMessage的2号：

package com.dxz.minademo4;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import org.apache.mina.filter.codec.demux.MessageDecoder;
import org.apache.mina.filter.codec.demux.MessageDecoderResult;

public class SendMessageDecoderNegative implements MessageDecoder {
    @Override
    public MessageDecoderResult decodable(IoSession session, IoBuffer in) {
        if (in.remaining() < 2)
            return MessageDecoderResult.NEED_DATA;
        else {
            char symbol = in.getChar();
            if (symbol == '-') {
                return MessageDecoderResult.OK;
            } else {
                return MessageDecoderResult.NOT_OK;
            }
        }
    }

    @Override
    public MessageDecoderResult decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
        SendMessage sm = new SendMessage();
        sm.setSymbol(in.getChar());
        sm.setI(-in.getInt());
        sm.setJ(-in.getInt());
        out.write(sm);
        return MessageDecoderResult.OK;
    }

    @Override
    public void finishDecode(IoSession session, ProtocolDecoderOutput out) throws Exception {
        // undo
    }
}

(6.)服务端使用的ResultMessage的编码器：

package com.dxz.minademo4;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
import org.apache.mina.filter.codec.demux.MessageEncoder;

public class ResultMessageEncoder implements MessageEncoder<ResultMessage> {
    @Override
    public void encode(IoSession session, ResultMessage message, ProtocolEncoderOutput out) throws Exception {
        IoBuffer buffer = IoBuffer.allocate(4);
        buffer.putInt(message.getResult());
        buffer.flip();
        out.write(buffer);
    }
}

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