1.0

旧的java项目/itcast/protocol/MessageCodec.java

@@ -0,0 +1,62 @@
+package cn.itcast.protocol;
+
+import cn.itcast.message.Message;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ByteToMessageCodec;
+import lombok.extern.slf4j.Slf4j;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.List;
+
+@Slf4j
+@ChannelHandler.Sharable
+public class MessageCodec extends ByteToMessageCodec<Message> {
+
+    @Override
+    public void encode(ChannelHandlerContext ctx, Message msg, ByteBuf out) throws Exception {
+//        // 1. 4 字节的魔数
+//        out.writeBytes(new byte[]{1, 2, 3, 4});
+//        // 2. 1 字节的版本,
+//        out.writeByte(1);
+//        // 3. 1 字节的序列化方式 jdk 0 , json 1
+//        out.writeByte(0);
+//        // 4. 1 字节的指令类型
+//        out.writeByte(msg.getMessageType());
+//        // 5. 4 个字节
+////        out.writeInt(msg.getSequenceId());
+//        // 无意义，对齐填充
+//        out.writeByte(0xff);
+//        // 6. 获取内容的字节数组
+//        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+//        ObjectOutputStream oos = new ObjectOutputStream(bos);
+//        oos.writeObject(msg);
+//        byte[] bytes = bos.toByteArray();
+//        // 7. 长度
+//        out.writeInt(bytes.length);
+//        // 8. 写入内容
+//        out.writeBytes(bytes);
+    }
+
+    @Override
+    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
+        int magicNum = in.readInt();
+        byte version = in.readByte();
+        byte serializerType = in.readByte();
+        byte messageType = in.readByte();
+        int sequenceId = in.readInt();
+        in.readByte();
+        int length = in.readInt();
+        byte[] bytes = new byte[length];
+        in.readBytes(bytes, 0, length);
+        ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytes));
+        Message message = (Message) ois.readObject();
+//        log.debug("{}, {}, {}, {}, {}, {}", magicNum, version, serializerType, messageType, sequenceId, length);
+//        log.debug("{}", message);
+        out.add(message);
+    }
+}