Netty基本编写
一、
public class Server { public static void main(String[] args) throws Exception { //1 创建线两个程组 //一个是用于处理服务器端接收客户端连接的 //一个是进行网络通信的(网络读写的) EventLoopGroup pGroup = new NioEventLoopGroup(); EventLoopGroup cGroup = new NioEventLoopGroup(); //2 创建辅助工具类,用于服务器通道的一系列配置 ServerBootstrap b = new ServerBootstrap(); b.group(pGroup, cGroup) //绑定俩个线程组 .channel(NioServerSocketChannel.class) //指定NIO的模式 .option(ChannelOption.SO_BACKLOG, 1024) //设置tcp缓冲区 .option(ChannelOption.SO_SNDBUF, 32*1024) //设置发送缓冲大小 .option(ChannelOption.SO_RCVBUF, 32*1024) //这是接收缓冲大小 .option(ChannelOption.SO_KEEPALIVE, true) //保持连接 .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel sc) throws Exception { //3 在这里配置具体数据接收方法的处理 sc.pipeline().addLast(new ServerHandler()); } }); //4 进行绑定 ChannelFuture cf1 = b.bind(8765).sync(); //ChannelFuture cf2 = b.bind(8764).sync(); //5 等待关闭 cf1.channel().closeFuture().sync(); //cf2.channel().closeFuture().sync(); pGroup.shutdownGracefully(); cGroup.shutdownGracefully(); } }
public class ServerHandler extends ChannelHandlerAdapter { @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { System.out.println("server channel active... "); } @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; byte[] req = new byte[buf.readableBytes()]; buf.readBytes(req); String body = new String(req, "utf-8"); System.out.println("Server :" + body ); String response = "进行返回给客户端的响应:" + body ; ctx.writeAndFlush(Unpooled.copiedBuffer(response.getBytes())); //.addListener(ChannelFutureListener.CLOSE);//会自动关闭连接 } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { System.out.println("读完了"); ctx.flush(); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable t) throws Exception { ctx.close(); } }
public class Client { public static void main(String[] args) throws Exception{ EventLoopGroup group = new NioEventLoopGroup(); Bootstrap b = new Bootstrap(); b.group(group) .channel(NioSocketChannel.class) .handler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel sc) throws Exception { sc.pipeline().addLast(new ClientHandler()); } }); ChannelFuture cf1 = b.connect("127.0.0.1", 8765).sync(); //ChannelFuture cf2 = b.connect("127.0.0.1", 8764).sync(); //发送消息 Thread.sleep(1000); cf1.channel().writeAndFlush(Unpooled.copiedBuffer("777".getBytes())); cf1.channel().writeAndFlush(Unpooled.copiedBuffer("666".getBytes())); //cf2.channel().writeAndFlush(Unpooled.copiedBuffer("888".getBytes())); Thread.sleep(2000); cf1.channel().writeAndFlush(Unpooled.copiedBuffer("888".getBytes())); //cf2.channel().writeAndFlush(Unpooled.copiedBuffer("666".getBytes())); cf1.channel().closeFuture().sync(); //cf2.channel().closeFuture().sync(); group.shutdownGracefully(); } }
public class ClientHandler extends ChannelHandlerAdapter{ @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { } @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { try { ByteBuf buf = (ByteBuf) msg; byte[] req = new byte[buf.readableBytes()]; buf.readBytes(req); String body = new String(req, "utf-8"); System.out.println("Client :" + body ); String response = "收到服务器端的返回信息:" + body; } finally { ReferenceCountUtil.release(msg); } } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { ctx.close(); } }