Netty客户端发送数据给服务器的两个通道

Love The Way You Lie 2023-12-06 07:07 18阅读 0赞

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<SocketChannel>() {
    					@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();
    			}
    		}
    	}
    }