itstack-demo-netty-1-08
└── src├── main│   └── java│       └── org.itstack.demo.netty.client│           ├── MyChannelInitializer.java│           ├── MyClientHandler.java│           └── NettyClient.java└── test└── java└── org.itstack.demo.netty.test└── ApiTest.java

/*** 虫洞栈：https://bugstack.cn* 公众号：bugstack虫洞栈  ｛获取学习源码｝* Create by fuzhengwei on 2019*/
public class MyChannelInitializer extends ChannelInitializer<SocketChannel> {@Overrideprotected void initChannel(SocketChannel channel) throws Exception {// 基于换行符号channel.pipeline().addLast(new LineBasedFrameDecoder(1024));// 解码转String，注意调整自己的编码格式GBK、UTF-8channel.pipeline().addLast(new StringDecoder(Charset.forName("GBK")));// 解码转String，注意调整自己的编码格式GBK、UTF-8channel.pipeline().addLast(new StringEncoder(Charset.forName("GBK")));// 在管道中添加我们自己的接收数据实现方法channel.pipeline().addLast(new MyClientHandler());}}

/*** 虫洞栈：https://bugstack.cn* 公众号：bugstack虫洞栈  ｛获取学习源码｝* Create by fuzhengwei on 2019*/
public class MyClientHandler extends ChannelInboundHandlerAdapter {/*** 当客户端主动链接服务端的链接后，这个通道就是活跃的了。也就是客户端与服务端建立了通信通道并且可以传输数据*/@Overridepublic void channelActive(ChannelHandlerContext ctx) throws Exception {SocketChannel channel = (SocketChannel) ctx.channel();System.out.println("链接报告开始");System.out.println("链接报告信息：本客户端链接到服务端。channelId：" + channel.id());System.out.println("链接报告IP:" + channel.localAddress().getHostString());System.out.println("链接报告Port:" + channel.localAddress().getPort());System.out.println("链接报告完毕");//通知客户端链接建立成功String str = "通知服务端链接建立成功" + " " + new Date() + " " + channel.localAddress().getHostString() + "rn";ctx.writeAndFlush(str);}/*** 当客户端主动断开服务端的链接后，这个通道就是不活跃的。也就是说客户端与服务端的关闭了通信通道并且不可以传输数据*/@Overridepublic void channelInactive(ChannelHandlerContext ctx) throws Exception {System.out.println("断开链接" + ctx.channel().localAddress().toString());}@Overridepublic void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {//接收msg消息{与上一章节相比，此处已经不需要自己进行解码}System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " 接收到消息：" + msg);//通知客户端链消息发送成功String str = "客户端收到：" + new Date() + " " + msg + "rn";ctx.writeAndFlush(str);}/*** 抓住异常，当发生异常的时候，可以做一些相应的处理，比如打印日志、关闭链接*/@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {ctx.close();System.out.println("异常信息：rn" + cause.getMessage());}}

/*** 虫洞栈：https://bugstack.cn* 公众号：bugstack虫洞栈  ｛获取学习源码｝* Create by fuzhengwei on 2019*/
public class NettyClient {public static void main(String[] args) {new NettyClient().connect("127.0.0.1", 7397);}private void connect(String inetHost, int inetPort) {EventLoopGroup workerGroup = new NioEventLoopGroup();try {Bootstrap b = new Bootstrap();b.group(workerGroup);b.channel(NioSocketChannel.class);b.option(ChannelOption.AUTO_READ, true);b.handler(new MyChannelInitializer());ChannelFuture f = b.connect(inetHost, inetPort).sync();System.out.println("itstack-demo-netty client start done. {关注公众号：bugstack虫洞栈，获取源码}");f.channel().closeFuture().sync();} catch (InterruptedException e) {e.printStackTrace();} finally {workerGroup.shutdownGracefully();}}}

/*** 虫洞栈：https://bugstack.cn* 公众号：bugstack虫洞栈  ｛获取学习源码｝* Create by fuzhengwei on 2019*/
public class NettyClient {public static void main(String[] args) {new NettyClient().connect("127.0.0.1", 7397);}private void connect(String inetHost, int inetPort) {EventLoopGroup workerGroup = new NioEventLoopGroup();try {Bootstrap b = new Bootstrap();b.group(workerGroup);b.channel(NioSocketChannel.class);b.option(ChannelOption.AUTO_READ, true);b.handler(new MyChannelInitializer());ChannelFuture f = b.connect(inetHost, inetPort).sync();System.out.println("itstack-demo-netty client start done. {关注公众号：bugstack虫洞栈，获取源码}");f.channel().closeFuture().sync();} catch (InterruptedException e) {e.printStackTrace();} finally {workerGroup.shutdownGracefully();}}}