netty-action-01

1、BIO、NIO、AIO相關後期補充

。。。。。。

2、Hello Netty

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<SocketChannel>() {
                        @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<HttpObject> {

    @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("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);
        }
    }
}

3、啓動項目

啓動項目，run -> 瀏覽器localhost:8081直接訪問即可（未過濾localhost:8081/xxxx類似的路徑）