Netty客户端发送数据给服务器的两个通道

package zhangphil.nettysender;

import java.io.DataInputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.sql.Date;
import java.text.SimpleDateFormat;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
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;
import io.netty.handler.codec.json.JsonObjectDecoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

public class App {
	private int SERVER_PORT = 20000;

	public App() throws Exception {
		new Server().start();
		connectServer();
	}

	// Netty作为客户端，发起对服务器端的连接请求。
	private void connectServer() {
		EventLoopGroup group = new NioEventLoopGroup();// 设置的连接group。
		Bootstrap bootstrap = new Bootstrap().group(group).option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000) // 超时时间。
				.channel(NioSocketChannel.class).handler(new ChannelInitializer() {
					@Override
					public void initChannel(SocketChannel ch) throws Exception {
						ch.pipeline().addLast(new JsonObjectDecoder());
						ch.pipeline().addLast(new StringEncoder(CharsetUtil.UTF_8));// String解码。
						ch.pipeline().addLast(new StringDecoder(CharsetUtil.UTF_8));// String解码。

						ch.pipeline().addLast(new MyChannelHandlerAdapter());//
					}
				});

		try {
			System.out.println("客户端连接服务器...");
			ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", SERVER_PORT)
					.addListener(new ChannelFutureListener() {
						public void operationComplete(ChannelFuture future) throws Exception {
							if (future.isSuccess()) {
								// 第一种方法。
								// Netty在这里发送数据。
								// sendDataToServer(future.channel());
							}
						}
					}).sync();

			// 等待连接关闭。
			channelFuture.channel().closeFuture().sync();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 发送数据到服务器端。
	 * 
	 * @throws Exception
	 */
	private void sendDataToServer(Channel channel) throws Exception {
		Date date = new Date(System.currentTimeMillis());
		SimpleDateFormat sdf = new SimpleDateFormat("MM-dd,HH:mm:ss:SSS");

		while (true) {
			date.setTime(System.currentTimeMillis());
			channel.writeAndFlush("客户端@" + sdf.format(date));
			System.out.println("客户端发送数据:" + sdf.format(date));

			Thread.sleep(1000);
		}
	}

	private class MyChannelHandlerAdapter extends ChannelHandlerAdapter {
		// 连接激活。
		@Override
		public void channelActive(ChannelHandlerContext ctx) throws Exception {
			super.channelActive(ctx);
			System.out.println("channelActive:" + ctx.channel().remoteAddress());

			// 第二种方法。
			// 连接可用激活后，Netty开始往服务器端发送数据。
			sendDataToServer(ctx.channel());
		}

		@Override
		public void channelInactive(ChannelHandlerContext ctx) throws Exception {
			super.channelInactive(ctx);
			System.out.println("channelInactive:" + ctx.channel().remoteAddress());
		}

		@Override
		public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
			super.channelRead(ctx, msg);
		}

		@Override
		public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
			super.channelReadComplete(ctx);
			System.out.println(ctx.channel().remoteAddress() + "读写完成");
		}
	}

	public static void main(String[] args) {
		try {
			new App();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	// 服务器端。演示作为服务器接受来自客户端的数据。
	private class Server extends Thread {
		private ServerSocket serverSocket;

		public Server() throws Exception {
			serverSocket = new ServerSocket(SERVER_PORT);
		}

		@Override
		public void run() {
			try {
				System.out.println("服务器启动...");
				Socket socket = serverSocket.accept();
				System.out.println("服务器接受连接");

				DataInputStream dis = new DataInputStream(socket.getInputStream());

				byte[] buffer = new byte[256];
				int c = 0;
				while (true) {
					c = dis.read(buffer);
					System.out.println("服务器端收到数据:" + new String(buffer, 0, c));
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}