k客户端：
package cn.itcast_03_netty.sendorder.client;import io.netty.bootstrap.Bootstrap;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelInitializer;import io.netty.channel.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.SocketChannel;import io.netty.channel.socket.nio.NioSocketChannel;import java.net.InetSocketAddress;import cn.itcast_03_netty.sendobject.coder.PersonEncoder;/** * • 连接服务器 • 写数据到服务器 • 等待接受服务器返回相同的数据 • 关闭连接 * * @author wilson * */public class EchoClient { private final String host; private final int port; public EchoClient(String host, int port) { this.host = host; this.port = port; } public void start() throws Exception { EventLoopGroup nioEventLoopGroup = null; try { // 客户端引导类 Bootstrap bootstrap = new Bootstrap(); // EventLoopGroup可以理解为是一个线程池，这个线程池用来处理连接、接受数据、发送数据 nioEventLoopGroup = new NioEventLoopGroup(); bootstrap.group(nioEventLoopGroup)//多线程处理 .channel(NioSocketChannel.class)//指定通道类型为NioServerSocketChannel，一种异步模式，OIO阻塞模式为OioServerSocketChannel .remoteAddress(new InetSocketAddress(host, port))//地址 .handler(new ChannelInitializer () { //业务处理类 @Override protected void initChannel(SocketChannel ch) throws Exception { ch.pipeline().addLast(new EchoClientHandler());//注册handler } }); // 链接服务器 ChannelFuture channelFuture = bootstrap.connect().sync(); channelFuture.channel().closeFuture().sync(); } finally { nioEventLoopGroup.shutdownGracefully().sync(); } } public static void main(String[] args) throws Exception { new EchoClient("localhost", 20000).start(); }}/*客户端连接服务器，开始发送数据……client 读取server数据..服务端数据为 :Sun May 13 10:32:47 CST 2018*/ package cn.itcast_03_netty.sendorder.client;import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.SimpleChannelInboundHandler;import cn.itcast_03_netty.sendobject.bean.Person;public class EchoClientHandler extends SimpleChannelInboundHandler{ // 客户端连接服务器后被调用 @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { System.out.println("客户端连接服务器，开始发送数据……"); byte[] req = "QUERY TIME ORDER".getBytes();//消息 ByteBuf firstMessage = Unpooled.buffer(req.length);//发送类 firstMessage.writeBytes(req);//发送 ctx.writeAndFlush(firstMessage);//flush } // • 从服务器接收到数据后调用 @Override protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception { System.out.println("client 读取server数据.."); // 服务端返回消息后 ByteBuf buf = (ByteBuf) msg; byte[] req = new byte[buf.readableBytes()]; buf.readBytes(req); String body = new String(req, "UTF-8"); System.out.println("服务端数据为 :" + body); } // • 发生异常时被调用 @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { System.out.println("client exceptionCaught.."); // 释放资源 ctx.close(); }}
服务端：
package cn.itcast_03_netty.sendorder.server;import io.netty.bootstrap.ServerBootstrap;import io.netty.channel.Channel;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelInitializer;import io.netty.channel.EventLoopGroup;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.nio.NioServerSocketChannel;import cn.itcast_03_netty.sendobject.coder.PersonDecoder;/** * • 配置服务器功能，如线程、端口 • 实现服务器处理程序，它包含业务逻辑，决定当有一个请求连接或接收数据时该做什么 * * @author wilson * */public class EchoServer { private final int port; public EchoServer(int port) { this.port = port; } public void start() throws Exception { EventLoopGroup eventLoopGroup = null; try { //server端引导类 ServerBootstrap serverBootstrap = new ServerBootstrap(); //连接池处理数据 eventLoopGroup = new NioEventLoopGroup(); serverBootstrap.group(eventLoopGroup) .channel(NioServerSocketChannel.class)//指定通道类型为NioServerSocketChannel，一种异步模式，OIO阻塞模式为OioServerSocketChannel .localAddress("localhost",port)//设置InetSocketAddress让服务器监听某个端口已等待客户端连接。 .childHandler(new ChannelInitializer () { //设置childHandler执行所有的连接请求 @Override protected void initChannel(Channel ch) throws Exception { // 注册两个InboundHandler，执行顺序为注册顺序，所以应该是InboundHandler1 InboundHandler2 // 注册两个OutboundHandler，执行顺序为注册顺序的逆序，所以应该是OutboundHandler2 OutboundHandler1 ch.pipeline().addLast(new EchoInHandler1()); ch.pipeline().addLast(new EchoInHandler2()); ch.pipeline().addLast(new EchoOutHandler1()); ch.pipeline().addLast(new EchoOutHandler2()); } }); // 最后绑定服务器等待直到绑定完成，调用sync()方法会阻塞直到服务器完成绑定,然后服务器等待通道关闭，因为使用sync()，所以关闭操作也会被阻塞。 ChannelFuture channelFuture = serverBootstrap.bind().sync(); System.out.println("开始监听，端口为：" + channelFuture.channel().localAddress()); channelFuture.channel().closeFuture().sync(); } finally { eventLoopGroup.shutdownGracefully().sync(); } } public static void main(String[] args) throws Exception { new EchoServer(20000).start(); }}/*开始监听，端口为：/127.0.0.1:20000in1in2接收客户端数据:QUERY TIME ORDERserver向client发送数据Complete1*/ package cn.itcast_03_netty.sendorder.server;import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;import java.util.Date;import cn.itcast_03_netty.sendobject.bean.Person;public class EchoInHandler1 extends ChannelInboundHandlerAdapter { @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { System.out.println("in1"); // 通知执行下一个InboundHandler ctx.fireChannelRead(msg); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { System.out.println("Complete1"); ctx.flush();//刷新后才将数据发出到SocketChannel } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { cause.printStackTrace(); ctx.close(); }} package cn.itcast_03_netty.sendorder.server;import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;import java.util.Date;import cn.itcast_03_netty.sendobject.bean.Person;public class EchoInHandler2 extends ChannelInboundHandlerAdapter { @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { System.out.println("in2"); ByteBuf buf = (ByteBuf) msg; byte[] req = new byte[buf.readableBytes()]; buf.readBytes(req); String body = new String(req, "UTF-8"); System.out.println("接收客户端数据:" + body); //向客户端写数据 System.out.println("server向client发送数据"); String currentTime = new Date(System.currentTimeMillis()).toString(); ByteBuf resp = Unpooled.copiedBuffer(currentTime.getBytes()); ctx.write(resp); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { System.out.println("Complete2"); ctx.flush();//刷新后才将数据发出到SocketChannel } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { cause.printStackTrace(); ctx.close(); }} package cn.itcast_03_netty.sendorder.server;import java.util.Date;import io.netty.buffer.ByteBuf;import io.netty.buffer.Unpooled;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelOutboundHandlerAdapter;import io.netty.channel.ChannelPromise;public class EchoOutHandler1 extends ChannelOutboundHandlerAdapter { @Override // 向client发送消息 public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception { System.out.println("out1"); /*System.out.println(msg);*/ String currentTime = new Date(System.currentTimeMillis()).toString(); ByteBuf resp = Unpooled.copiedBuffer(currentTime.getBytes()); ctx.write(resp); ctx.flush(); }} package cn.itcast_03_netty.sendorder.server;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelOutboundHandlerAdapter;import io.netty.channel.ChannelPromise;public class EchoOutHandler2 extends ChannelOutboundHandlerAdapter { @Override public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception { System.out.println("out2"); // 执行下一个OutboundHandler /*System.out.println("at first..msg = "+msg); msg = "hi newed in out2";*/ super.write(ctx, msg, promise); }}