Netty權威指南之Netty入門程式

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package com.hjp.netty.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.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.SocketChannel;import io.netty.channel.socket.nio.NioServerSocketChannel;public class TimeServer {    public void bind(int port) throws Exception {        //佈建服務端的線程組，兩個線程組，一個用於服務端接收用戶端串連，另一個進行SocketChannel的網路讀寫        EventLoopGroup bossGroup = new NioEventLoopGroup();        EventLoopGroup workerGroup = new NioEventLoopGroup();        try {            //ServerBootstrap用於啟動NIO服務端的輔助啟動類，目的是降低服務端開發複雜度            ServerBootstrap bootstrap = new ServerBootstrap();            bootstrap.group(bossGroup, workerGroup)                    .channel(NioServerSocketChannel.class)                    .option(ChannelOption.SO_BACKLOG, 1024)                    .childHandler(new ChildChannelHandler());            //綁定連接埠，同步等待成功            ChannelFuture future=bootstrap.bind(port).sync();            //等待服務端監聽連接埠關閉            future.channel().closeFuture().sync();        }finally {            //優雅退出，釋放線程資源            bossGroup.shutdownGracefully();            workerGroup.shutdownGracefully();        }    }    private class ChildChannelHandler extends ChannelInitializer<SocketChannel>{        protected void initChannel(SocketChannel socketChannel) throws Exception {            socketChannel.pipeline().addLast(new TimeServerHandler());        }    }    public static void main(String[] args)throws Exception{        int port=8080;        if(args!=null&&args.length>0){            try {                port=Integer.valueOf(args[0]);            }catch (NumberFormatException e){            }        }        new TimeServer().bind(port);    }}

TimeServer

package com.hjp.netty.netty;import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerAdapter;import io.netty.channel.ChannelHandlerContext;import java.util.Date;public class TimeServerHandler extends ChannelHandlerAdapter {    @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {        ctx.close();    }    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {        ByteBuf byteBuf= (ByteBuf) msg;        byte[] request=new byte[byteBuf.readableBytes()];        byteBuf.readBytes(request);        String body=new String(request,"UTF-8");        System.out.println("The time server receive order : "+body);        String currentTime="QUERY TIME ORDER".equalsIgnoreCase(body)?new Date().toString():"BAD ORDER";        ByteBuf response= Unpooled.copiedBuffer(currentTime.getBytes());        ctx.write(response);    }    @Override    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {        ctx.flush();    }}

TimeServerHandler

package com.hjp.netty.netty;import io.netty.bootstrap.Bootstrap;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelInitializer;import io.netty.channel.ChannelOption;import io.netty.channel.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.SocketChannel;import io.netty.channel.socket.nio.NioSocketChannel;public class TimeClient {    public void connect(String host, int port) throws Exception {        //配置用戶端NIO線程組        EventLoopGroup group = new NioEventLoopGroup();        try {            Bootstrap bootstrap = new Bootstrap();            bootstrap.group(group).channel(NioSocketChannel.class)                    .option(ChannelOption.TCP_NODELAY, true)                    .handler(new ChannelInitializer<SocketChannel>() {                        protected void initChannel(SocketChannel socketChannel) throws Exception {                            socketChannel.pipeline().addLast(new TimeClientHandler());                        }                    });            //發起非同步串連操作，同步等待串連成功            ChannelFuture future=bootstrap.connect(host,port).sync();            //等待用戶端鏈路關閉            future.channel().close().sync();        }finally {            //優雅退出，釋放NIO線程組            group.shutdownGracefully();        }    }    public static void main(String[] args)throws Exception{        int port=8080;        if(args!=null&&args.length>0){            try {                port=Integer.valueOf(port);            }catch (NumberFormatException e){            }        }        new TimeClient().connect("127.0.0.1",port);    }}

TimeClient

package com.hjp.netty.netty;import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerAdapter;import io.netty.channel.ChannelHandlerContext;import java.util.logging.Logger;public class TimeClientHandler extends ChannelHandlerAdapter {    private static final Logger logger = Logger.getLogger(TimeClientHandler.class.getName());    private final ByteBuf firstMessage;    public TimeClientHandler() {        byte[] request = "QUERY TIME ORDER".getBytes();        firstMessage = Unpooled.buffer(request.length);        firstMessage.writeBytes(request);    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {        logger.warning("Unexpected exception from downstream : "+cause.getMessage());        ctx.close();    }    @Override    public void channelActive(ChannelHandlerContext ctx) throws Exception {        ctx.writeAndFlush(firstMessage);    }    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {        ByteBuf byteBuf= (ByteBuf) msg;        byte[] request=new byte[byteBuf.readableBytes()];        byteBuf.readBytes(request);        String body=new String(request,"UTF-8");        System.out.println("Now is "+body);    }}

TimeClientHandler

 

Netty權威指南之Netty入門程式