io-4-netty-入门程序
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netty入门小程序
server
public class TestNettyServer { public static void main(String[] args) { int port = 8888 ; try { new TestNettyServer().bind(port); } catch (InterruptedException e) { e.printStackTrace(); } } private void bind( int port) throws InterruptedException { //reactor线程组 //用于服务端接受客户端连接 EventLoopGroup boosGroup=new NioEventLoopGroup(); //进行socketChannel 读写 EventLoopGroup workGroup=new NioEventLoopGroup(); try { // netty 服务端启动类 ServerBootstrap serverBootstrap=new ServerBootstrap(); serverBootstrap.group(boosGroup, workGroup) //创建服务端 .channel(NioServerSocketChannel.class) //设置tcp参数 .option(ChannelOption.SO_BACKLOG, 1024) //处理io事件 .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { socketChannel.pipeline().addLast(new ChannelInboundHandlerAdapter() { @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { //super.channelRead(ctx, msg); ByteBuf buf = (ByteBuf)msg; // 创建域buf中可读字节数相同大小的数组 byte[] req=new byte[buf.readableBytes()]; //将缓冲区可读字节复制到req数组中 buf.readBytes(req); System.out.println(" the time server receiver request :" + new String(req, "utf-8")); ByteBuf resp=Unpooled.copiedBuffer(new Date(System.currentTimeMillis()).toLocaleString().getBytes()); //写回客户端 ctx.write(resp); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { //super.channelReadComplete(ctx); //刷新到缓冲数组中 ctx.flush(); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { super.exceptionCaught(ctx, cause); ctx.close(); } }); } }); //绑定端口，同步等待 ChannelFuture future = serverBootstrap.bind(port).sync(); future.channel().closeFuture().sync(); }finally { //释放线程池资源 boosGroup.shutdownGracefully(); workGroup.shutdownGracefully(); } }}//输出//the time server receiver request : tell me the time client
public class TestNettyClient { public static void main(String[] args) throws InterruptedException { //客户端工作线程组 EventLoopGroup clienGroup=new NioEventLoopGroup(); //客户端netty服务启动 Bootstrap bootstrap=new Bootstrap(); try { bootstrap.group(clienGroup) //客户端通道 .channel(NioSocketChannel.class) //设置可选参数 .option(ChannelOption.TCP_NODELAY, true) //处理io事件 .handler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { socketChannel.pipeline().addLast(new ChannelInboundHandlerAdapter() { @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { //super.channelRead(ctx, msg); ByteBuf buf=(ByteBuf) msg; // 创建域buf中可读字节数相同大小的数组 byte[] req=new byte[buf.readableBytes()]; //将缓冲区可读字节复制到req数组中 buf.readBytes(req); System.out.println(" client receive resp from server that the time is :" + new String(req, "utf-8")); } @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { super.channelActive(ctx); //发送请求 byte[] bytes=" tell me the time ".getBytes(); ByteBuf buf=Unpooled.buffer(bytes.length); buf.writeBytes(bytes); ctx.writeAndFlush(buf); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { super.exceptionCaught(ctx, cause); ctx.close(); //异常关闭资源 } }); } }); ChannelFuture future=bootstrap.connect("127.0.0.1", 8888).sync(); future.channel().closeFuture().sync(); }finally { clienGroup.shutdownGracefully(); } }}//输出//client receive resp from server that the time is :2017-7-21 0:23:54Tcp粘包/拆包
tcp在传输数据时，可能会拆分为多个包进行发送，也可能会将多个小包合并为一个大包发送。 解决： 1.消息定长发送； 2.在包尾增加回车换车符进行分割 3.将消息分为消息头和消息体，消息头中包含表示消息总长度的字段。
server
public class TestTcpServer { public static void main(String[] args) { int port=8888; try { new TestTcpServer().bind(port); } catch (InterruptedException e) { e.printStackTrace(); } } private void bind(int port) throws InterruptedException { //reactor线程组 //用于服务端接受客户端连接 EventLoopGroup boosGroup=new NioEventLoopGroup(); //进行socketChannel 读写 EventLoopGroup workGroup=new NioEventLoopGroup(); //记录客户端请求次数 AtomicInteger atomicInteger=new AtomicInteger(0); try { // netty 服务端启动类 ServerBootstrap serverBootstrap=new ServerBootstrap(); serverBootstrap.group(boosGroup, workGroup) //创建服务端 .channel(NioServerSocketChannel.class) //设置tcp参数 .option(ChannelOption.SO_BACKLOG, 1024) //处理io事件 .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { //换行解码器 socketChannel.pipeline(). addLast(new LineBasedFrameDecoder(1024)); //直接将接受对象转化为String类型 socketChannel.pipeline().addLast(new StringDecoder()); //增加处理器 socketChannel.pipeline().addLast(new ChannelInboundHandlerAdapter() { @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { ////super.channelRead(ctx, msg); //ByteBuf buf=(ByteBuf) msg; //// 创建域buf中可读字节数相同大小的数组 //byte[] req=new byte[buf.readableBytes()]; ////将缓冲区可读字节复制到req数组中 //buf.readBytes(req); String req = (String)msg ; System.out.println(" the time server receiver request :" + req +" ; the count = " + atomicInteger.incrementAndGet() ); String response=new Date(System.currentTimeMillis()).toLocaleString() + System.getProperty("line.separator"); ByteBuf resp=Unpooled.copiedBuffer(response.getBytes()); //写回客户端 ctx.write(resp); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { //super.channelReadComplete(ctx); //刷新到缓冲数组中 ctx.flush(); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { super.exceptionCaught(ctx, cause); ctx.close(); } }); } }); //绑定端口，同步等待 ChannelFuture future=serverBootstrap.bind(port).sync(); future.channel().closeFuture().sync(); } finally { //释放线程池资源 boosGroup.shutdownGracefully(); workGroup.shutdownGracefully(); } }}//输出... the time server receiver request : tell me the time ; the count = 99 the time server receiver request : tell me the time ; the count = 100client
public class TestTcpServer { public static void main(String[] args) { int port=8888; try { new TestTcpServer().bind(port); } catch (InterruptedException e) { e.printStackTrace(); } } private void bind(int port) throws InterruptedException { //reactor线程组 //用于服务端接受客户端连接 EventLoopGroup boosGroup=new NioEventLoopGroup(); //进行socketChannel 读写 EventLoopGroup workGroup=new NioEventLoopGroup(); //记录客户端请求次数 AtomicInteger atomicInteger=new AtomicInteger(0); try { // netty 服务端启动类 ServerBootstrap serverBootstrap=new ServerBootstrap(); serverBootstrap.group(boosGroup, workGroup) //创建服务端 .channel(NioServerSocketChannel.class) //设置tcp参数 .option(ChannelOption.SO_BACKLOG, 1024) //处理io事件 .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { //换行解码器 socketChannel.pipeline(). addLast(new LineBasedFrameDecoder(1024)); //直接将接受对象转化为String类型 socketChannel.pipeline().addLast(new StringDecoder()); //增加处理器 socketChannel.pipeline().addLast(new ChannelInboundHandlerAdapter() { @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { ////super.channelRead(ctx, msg); //ByteBuf buf=(ByteBuf) msg; //// 创建域buf中可读字节数相同大小的数组 //byte[] req=new byte[buf.readableBytes()]; ////将缓冲区可读字节复制到req数组中 //buf.readBytes(req); String req = (String)msg ; System.out.println(" the time server receiver request :" + req +" ; the count = " + atomicInteger.incrementAndGet() ); String response=new Date(System.currentTimeMillis()).toLocaleString() + System.getProperty("line.separator"); ByteBuf resp=Unpooled.copiedBuffer(response.getBytes()); //写回客户端 ctx.write(resp); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { //super.channelReadComplete(ctx); //刷新到缓冲数组中 ctx.flush(); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { super.exceptionCaught(ctx, cause); ctx.close(); } }); } }); //绑定端口，同步等待 ChannelFuture future=serverBootstrap.bind(port).sync(); future.channel().closeFuture().sync(); } finally { //释放线程池资源 boosGroup.shutdownGracefully(); workGroup.shutdownGracefully(); } }}//输出client receive resp from server that the time is :2017-7-21 15:47:33 ; count = 98 client receive resp from server that the time is :2017-7-21 15:47:33 ; count = 99 client receive resp from server that the time is :2017-7-21 15:47:33 ; count = 100阅读全文
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