netty1

tcp server端代码

 public static void main(String[] args) throws InterruptedException {
        NioEventLoopGroup workerGroup = new NioEventLoopGroup();
        NioEventLoopGroup bossGroup = new NioEventLoopGroup();
        ServerBootstrap bootstrap = new ServerBootstrap();
        bootstrap.group(bossGroup,workerGroup)
                .channel(NioServerSocketChannel.class)
                .option(ChannelOption.SO_BACKLOG,124) // 当服务器请求处理线程全满时，用于临时存放已完成三次握手的请求的队列的最大长度
                .childOption(ChannelOption.SO_KEEPALIVE,true)// 对tcp连接进行心跳保活
        .childHandler(new ChannelInitializer<SocketChannel>() {
            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                ch.pipeline().addLast(new NettyServerHandler());
            }
        });
        System.out.println("server start ok...");
        ChannelFuture channelFuture = bootstrap.bind(8881).sync();
        // 异步处理
        channelFuture.addListener(new ChannelFutureListener() {
            @Override
            public void operationComplete(ChannelFuture future) throws Exception {
                if (channelFuture.isSuccess()){
                    System.out.println("监听端口 成功");
                }else {
                    System.out.println("监听端口 失败");
                }
            }
        });
        System.out.println("h");
        channelFuture.channel().closeFuture().sync();


    }

serverhandler

package com.rudy.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;

public class NettyServerHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf) msg;
        System.out.println("客户端说："+buf.toString(CharsetUtil.UTF_8));
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.writeAndFlush(Unpooled.copiedBuffer("你好客户端",CharsetUtil.UTF_8));
    }

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

client端代码

package com.rudy.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;

public class MyNettyClient {
    public static void main(String[] args) throws InterruptedException {
        NioEventLoopGroup eventExecutors = new NioEventLoopGroup();
        Bootstrap bootStrap = new Bootstrap();
        bootStrap.group(eventExecutors)
                .channel(NioSocketChannel.class)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ch.pipeline().addLast(new NettyClientHandler());
                    }
                });

        ChannelFuture channelFuture = bootStrap.connect("127.0.0.1", 8881).sync();
        channelFuture.channel().closeFuture().sync();


    }
}

clienthandler

package com.rudy.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;

public class NettyClientHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        ctx.channel().writeAndFlush(Unpooled.copiedBuffer("这里是客户端", CharsetUtil.UTF_8));

    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf buf = (ByteBuf) msg;
        System.out.println("服务器回复消息："+buf.toString(CharsetUtil.UTF_8));
    }
}

在channel对eventloop任务队列 添加普通任务任务

注意eventloop是个队列 任务是排队执行的

ctx.channel().eventLoop().execute(new Runnable() {
            @Override
            public void run() {
                ByteBuf buf = (ByteBuf) msg;
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("客户端说："+buf.toString(CharsetUtil.UTF_8));
            }
        });

 定时提交任务

ctx.channel().eventLoop().schedule(new Runnable() {
            @Override
            public void run() {
                ctx.writeAndFlush(Unpooled.copiedBuffer("你好客户端2", CharsetUtil.UTF_8));
            }
        }, 2, TimeUnit.SECONDS);

netty实现http服务

// SimpleChannelInboundHandler 是 ChannelInboundHandlerAdapter子类
// HttpObject 相互通信的数据被封装成httpobject
// 每个http请求都会新创建pipeline和handler
public class HttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        if (msg instanceof HttpRequest){
            System.out.println(msg.getClass());
            System.out.println(ctx.channel().remoteAddress());
            URI uri = new URI(((HttpRequest) msg).uri());
            if(uri.getPath().equals("/favicon.ico")){
                System.out.println("拒绝请求");
                return;
            }
            ByteBuf content = Unpooled.copiedBuffer("hello 我是服务器", CharsetUtil.UTF_8);
            DefaultFullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK,content);
            response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain; charset=utf-8");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());
            ctx.writeAndFlush(response);
        }
    }
}

public class NettyServerInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new HttpServerCodec());
        pipeline.addLast(new HttpServerHandler());
    }
}

 public static void main(String[] args) {
        NioEventLoopGroup bossGroup = new NioEventLoopGroup();
        NioEventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new NettyServerInitializer());
            ChannelFuture channelFuture = serverBootstrap.bind(8881).sync();
            channelFuture.channel().closeFuture().sync();

        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }