MqttEncoder (Netty API Reference (4.1.22.Final))

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java.lang.Object
- io.netty.channel.ChannelHandlerAdapter
- - io.netty.channel.ChannelOutboundHandlerAdapter
  - - io.netty.handler.codec.MessageToMessageEncoder<MqttMessage>
    - - io.netty.handler.codec.mqtt.MqttEncoder

All Implemented Interfaces:

ChannelHandler ， ChannelOutboundHandler
```
@ChannelHandler.Sharable
public final class MqttEncoder
extends MessageToMessageEncoder<MqttMessage>
```
按照协议规范v3.1将Mqtt消息编码为字节，如此处所述 MQTTV3.1

Nested Class Summary
- Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler
  ChannelHandler.Sharable

Field Summary

Fields
Modifier and Type	Field and Description
`static MqttEncoder`	`INSTANCE`

方法摘要

所有方法接口方法具体的方法
Modifier and Type	Method and Description
`protected void`	`encode(ChannelHandlerContext ctx, MqttMessage msg, java.util.List<java.lang.Object> out)` 从一条消息编码到另一条消息。

Methods inherited from class io.netty.handler.codec.MessageToMessageEncoder
acceptOutboundMessage, write

Methods inherited from class io.netty.channel.ChannelOutboundHandlerAdapter
bind, close, connect, deregister, disconnect, flush, read

Methods inherited from class io.netty.channel.ChannelHandlerAdapter
ensureNotSharable, exceptionCaught, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty.channel.ChannelHandler
exceptionCaught, handlerAdded, handlerRemoved

- 字段详细信息
  - INSTANCE
```
public static final MqttEncoder INSTANCE
```
- 方法详细信息
  - encode
```
protected void encode(ChannelHandlerContext ctx,
                      MqttMessage msg,
                      java.util.List<java.lang.Object> out)
               throws java.lang.Exception
```
    从类复制的描述： MessageToMessageEncoder
    
    从一条消息编码到另一条消息。这个方法将被编码器处理的每个书面信息调用。
    
    Specified by:
    
    encode在课堂上 MessageToMessageEncoder<MqttMessage>
    
    参数
    
    ctx - 这MessageToMessageEncoder所属的ChannelHandlerContext
    
    msg - 要编码到另一个的消息
    
    out - 应该添加编码味精的 List需要做某种聚合
    
    异常
    
    java.lang.Exception - 发生错误时抛出

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