Netty中Channel的生命周期（SimpleChannelInboundHandler）

转载自：https://blog.csdn.net/u014131617/article/details/86476522

类的说明

public class CustomHandler extends SimpleChannelInboundHandler<HttpObject>{}

1.channelRegistered

channel注册事件

   @Override
   public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel注册了");
       super.channelRegistered(ctx);
   }

2.channelUnregistered

channel取消注册事件

@Override
   public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel移除了");
       super.channelUnregistered(ctx);
   }

3.channelActive

channel是否是活跃

   @Override
   public void channelActive(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel 活跃");
       super.channelActive(ctx);
   }

4.channelInactive

channel不活跃

   @Override
   public void channelInactive(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel 不活跃，断开连接");
       super.channelInactive(ctx);
   }

5.channelReadComplete

channel读取完毕事件

   @Override
   public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel 读取完毕");
       super.channelReadComplete(ctx);
   }

6.userEventTriggered

channel 用户事件触发

   @Override
   public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
       System.out.println("channel 用户事件触发");
       super.userEventTriggered(ctx, evt);
   }

7.channelWritabilityChanged

channel 可写更改

   @Override
   public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel 可写更改");
       super.channelWritabilityChanged(ctx);
   }

8.exceptionCaught

channel 捕获到异常

   @Override
   public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
       System.out.println("channel 捕获到异常了，关闭了");
       super.exceptionCaught(ctx, cause);
   }

9.handlerAdded

channel 助手类(拦截器)的添加

   @Override
   public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel 助手类添加");
       super.handlerAdded(ctx);
   }

10.handlerRemoved

channel 助手类(拦截器)移除

   @Override
   public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
       System.out.println("channel 助手类移除");
       super.handlerRemoved(ctx);
   }

11.channelRead0

channel读取数据

@Override
   protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg)
           throws Exception {
       Channel channel = ctx.channel();//获取当前channel
       System.out.println(channel.remoteAddress()); //显示客户端的远程地址
       //定义发送的数据消息
       ByteBuf content = Unpooled.copiedBuffer("Hello cxl",CharsetUtil.UTF_8);
       //构建一个http响应
       FullHttpResponse response =
               new DefaultFullHttpResponse
               (HttpVersion.HTTP_1_1,
                       HttpResponseStatus.OK,
                       content);

       response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
       response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());

       //把响应刷到客户端
       ctx.writeAndFlush(response);
   }

12.执行顺序

Netty中Channel的生命周期（SimpleChannelInboundHandler）
---------------------
作者：小龙哒
来源：CSDN
原文：https://blog.csdn.net/u014131617/article/details/86476522
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