netty-channel-handler.md

ChannelHandler

Handles an I/O event or intercepts an I/O operation, and forwards it to its next handler in its ChannelPipeline.

• 接受 IO 事件
• 拦截 IO 操作
• 在 ChannelPipeline 中进行转发

ChannelHandler在添加到ChannelPipeline中的时候，可以选择共享或者每个连接（Channel）单独一个

ChannelInboundHandler

ChannelOutboundHandler

ChannelInboundHandlerAdapter

ChannelOutboundHandlerAdapter

ChannelDuplexHandler

SimpleChannelInboundHandler

在处理接受(read)到的数据时，可以继承此类