netty-action-02

注：黑色部分代碼與netty-action-01一致，請看netty-01部分

1、netty - channel 生命週期的描述

package com.renxiaobo.wechat.demo01;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.;
import io.netty.util.CharsetUtil;

/**

• Author：rxb

• Date：2020-06-10 20:44

• Description：客戶端發送一個請求，服務端返回hello netty
  */
  public class HelloServer {

  public static void main(String[] args) {
  EventLoopGroup bossGroup = new NioEventLoopGroup();
  EventLoopGroup workerGroup = new NioEventLoopGroup();
  try {
  ServerBootstrap serverBootstrap = new ServerBootstrap();
  serverBootstrap.group(bossGroup, workerGroup)
  .channel(NioServerSocketChannel.class)
  .childHandler(new ChannelInitializer() {
  @Override
  protected void initChannel(SocketChannel socketChannel) throws Exception {
  ChannelPipeline pipeline = socketChannel.pipeline();
  pipeline.addLast(“HttpServerCodec”, new HttpServerCodec());//netty自己提供的 助手類，當請求到服務端，需要-解碼，響應到客戶-做編碼
  pipeline.addLast(new ChildHandler());
  }
  });
  ChannelFuture channelFuture = serverBootstrap.bind(8081).sync();
  channelFuture.channel().closeFuture().sync();
  } catch (InterruptedException e) {
  e.printStackTrace();
  } finally {
  workerGroup.shutdownGracefully();
  bossGroup.shutdownGracefully();
  }

  }
  }

/***************************************************************
** 這是一個漂亮的分隔符
***************************************************************/
class ChildHandler extends SimpleChannelInboundHandler {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        Channel channel = ctx.channel();

        if(msg instanceof HttpRequest && !((HttpRequest) msg).uri().contains("/favicon.ico")){
            System.out.println("當前客戶端地址：" + channel.remoteAddress());

            ByteBuf content = Unpooled.copiedBuffer("哈哈大hello netty~~~", CharsetUtil.UTF_8);

            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());

            ctx.writeAndFlush(response);
        }
    }

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

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

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

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.out.println(" channel不活躍（客戶端與服務器斷開連接） -->");
        super.channelInactive(ctx);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        System.out.println(" channel數據讀取完畢 -->");
        super.channelReadComplete(ctx);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        System.out.println(" 用戶事件觸發 -->");
        super.userEventTriggered(ctx, evt);
    }

    @Override
    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
        System.out.println(" channel可寫事件更改 -->");
        super.channelWritabilityChanged(ctx);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println(" 異常信息（關閉資源） -->");
        super.exceptionCaught(ctx, cause);
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        System.out.println(" 助手類添加 -->");
        super.handlerAdded(ctx);
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println(" 助手類移除 -->");
        super.handlerRemoved(ctx);
    }
}

2、netty - channel 生命週期的控制檯結果展示(這邊直接doc命令curl localhost:8081訪問得到)

助手類添加 -->
channel註冊 -->
channel活躍 -->
當前客戶端地址：/0:0:0:0:0:0:0:1:58512
channel數據讀取完畢 -->
channel數據讀取完畢 -->
channel不活躍（客戶端與服務器斷開連接） -->
channel移除 -->
助手類移除 -->