netty encoder 重写父类的代码

最新推荐文章于 2024-07-03 09:45:23 发布

原创最新推荐文章于 2024-07-03 09:45:23 发布 · 557 阅读

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本文介绍了一种使用Netty框架进行对象序列化的编码方法。该方法通过ChannelBufferOutputStream和CompactObjectOutputStream将对象写入缓冲区，并预留长度占位符以便后续更新实际长度。完成对象写入后，通过设置预留位置的值来填充实际的数据长度。

@Override
    protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
        ChannelBufferOutputStream bout =
            new ChannelBufferOutputStream(dynamicBuffer(
                    estimatedLength, ctx.getChannel().getConfig().getBufferFactory()));
        bout.write(LENGTH_PLACEHOLDER);
        ObjectOutputStream oout = new CompactObjectOutputStream(bout);
        oout.writeObject(msg);
        oout.flush();
        oout.close();

        ChannelBuffer encoded = bout.buffer();
        encoded.setInt(0, encoded.writerIndex() - 4);
        return encoded;
    }