Netty回调与Channel执行流程分析

package com.example.firstexample;

import io.netty.buffer.ByteBuf;

import io.netty.buffer.Unpooled;

import io.netty.channel.ChannelHandlerContext;

import io.netty.channel.SimpleChannelInboundHandler;

import io.netty.handler.codec.http.*;

import io.netty.util.CharsetUtil;

import java.net.URI;

public class TestHttpServerHandle  extends SimpleChannelInboundHandler<HttpObject>{

    //读取客户端发送过来的请求，并且向客户端返回响应

    protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject httpObject) throws Exception {

        CommonUtil.println(httpObject.getClass());

        CommonUtil.println(channelHandlerContext.channel().remoteAddress());

        if(httpObject instanceof  HttpRequest){

            HttpRequest httpRequest = (HttpRequest) httpObject;

            CommonUtil.println("请求方法名:" + httpRequest.method().name() + ",uri:" + httpRequest.uri());

            URI uri = new URI(httpRequest.uri());

            if("/favicon.ico".equals(uri.getPath())){

                CommonUtil.println("请求favicon.ico");

                return;

            }

            ByteBuf content = Unpooled.copiedBuffer("Hello world", 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());

            //写回客户端

            channelHandlerContext.writeAndFlush(response);

            //channelHandlerContext.close();

        }

    }

    @Override

    public void channelActive(ChannelHandlerContext ctx) throws Exception {

        CommonUtil.println("channel Active");

        super.channelActive(ctx);

    }

    @Override

    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {

        CommonUtil.println("channel Registered");

        super.channelRegistered(ctx);

    }

    @Override

    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {

        CommonUtil.println("channel Added");

        super.handlerAdded(ctx);

    }

    @Override

    public void channelInactive(ChannelHandlerContext ctx) throws Exception {

        CommonUtil.println("channel Inactive");

        super.channelInactive(ctx);

    }

    @Override

    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {

        CommonUtil.println("channel Unregistered");

        super.channelUnregistered(ctx);

    }

}

public class CommonUtil {

    public static  void println(String msg){

        System.out.println(String.format("[thread-%s] %s",Thread.currentThread().getId(), msg));

    }

    public static  void println(Object msg){

        println(msg.toString());

    }

}