简单实例

一个基础使用方式，方便自己查看。

package com.sora.springboot01.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

/**
 * @Classname: MyClient
 * @Description:
 * @Author: Stonffe
 * @Date: 2022/11/27 19:33
 */
public class MyClient {
    public static void main(String[] args) throws InterruptedException {
        NioEventLoopGroup eventExecutors = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(eventExecutors)
                    .channel(NioSocketChannel.class)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            socketChannel.pipeline().addLast(new MyClientHandler());
                        }
                    });
            System.out.println("客户端准备完毕，ok");
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 6666).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
            eventExecutors.shutdownGracefully();
        }
    }
}

package com.sora.springboot01.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;
import io.netty.util.concurrent.EventExecutorGroup;

/**
 * @Classname: MyClientHandler
 * @Description:
 * @Author: Stonffe
 * @Date: 2022/11/27 19:38
 */
public class MyClientHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        ctx.writeAndFlush(Unpooled.copiedBuffer("hello hello,konichiwa", CharsetUtil.UTF_8));
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf byteBuf = (ByteBuf) msg;
        System.out.println("收到服务端"+ctx.channel().remoteAddress()+"的消息"+byteBuf.toString(CharsetUtil.UTF_8));
    }
}

package com.sora.springboot01.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;

/**
 * @Classname: MyServer
 * @Description:
 * @Author: Stonffe
 * @Date: 2022/11/27 15:32
 */
public class MyServer {
    public static void main(String[] args) throws InterruptedException {
        NioEventLoopGroup bossGroup = new NioEventLoopGroup();
        NioEventLoopGroup wokerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(bossGroup,wokerGroup)
                    .channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG,128)
                    .childOption(ChannelOption.SO_KEEPALIVE,true)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            socketChannel.pipeline().addLast(new MyServerHandler());
                        }
                    });
            System.out.println("服务端已经准备就绪");
            ChannelFuture channelFuture = bootstrap.bind(6666).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            wokerGroup.shutdownGracefully();
        }
    }
}

package com.sora.springboot01.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * @Classname: MyServerHandler
 * @Description:
 * @Author: Stonffe
 * @Date: 2022/11/27 19:24
 */
public class MyServerHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        System.out.println(msg);
        ByteBuf byteBuf = (ByteBuf) msg;
        System.out.println("收到客户端"+ctx.channel().remoteAddress()+"发送的消息"+byteBuf.toString(CharsetUtil.UTF_8));
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.writeAndFlush(Unpooled.copiedBuffer("服务端已收到消息，并发送你一个问号？", CharsetUtil.UTF_8));
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
    }
}