Netty实例-简单的服务端-客户端实现，注释详细

1. Netty Server端实现
   

   /**
    * 
    * <p>
    * 	Netty Server Simple
    * </p>
    * 
    * @author 卓轩
    * @创建时间：2014年7月7日
    * @version： V1.0
    */
   
   public class NettyServer {
   	
   	private final int port = 8989;
   	
   	@Test
   	public void nettyServer(){
   		
   		EventLoopGroup bossGroup = new NioEventLoopGroup();
   		EventLoopGroup workerGroup = new NioEventLoopGroup();
   		
   		try {
   			ServerBootstrap serverBootstrap = new ServerBootstrap();
   			serverBootstrap.group(bossGroup,workerGroup)
   				.channel(NioServerSocketChannel.class)
   				.option(ChannelOption.SO_BACKLOG, 1024)
   				.childHandler(new ChildChannelHandler());
   			
   			//绑定端口、同步等待
   			ChannelFuture futrue = serverBootstrap.bind(port).sync();
   			
   			//等待服务监听端口关闭
   			futrue.channel().closeFuture().sync();
   		} catch (InterruptedException e) {
   			// TODO Auto-generated catch block
   			e.printStackTrace();
   		}finally{
   			//退出，释放线程等相关资源
   			bossGroup.shutdownGracefully();
   			workerGroup.shutdownGracefully();
   		}
   
   		
   	}
   
   	private class ChildChannelHandler extends ChannelInitializer<SocketChannel>{
   		@Override
   		protected void initChannel(SocketChannel ch) throws Exception {
   
   			ch.pipeline().addLast(new SimpleServerHandler());
   		}
   	}
   	
   }
   

   
   
2. Netty Client 实现
   
   

   /**
    * 
    * <p>
    * 	NettyClient  实现
    * </p>
    * 
    * @author 卓轩
    * @创建时间：2014年7月7日
    * @version： V1.0
    */
   public class NettyClient {
   
   	
   	
   	public void connect(int port,String host){
   		
   		EventLoopGroup group = new NioEventLoopGroup();
   		
   		try {
   			Bootstrap bootstrap = new Bootstrap();
   			bootstrap.group(group)
   			.channel(NioSocketChannel.class)
   			.option(ChannelOption.TCP_NODELAY, true)
   			.handler(new ChannelInitializer<SocketChannel>() {
   
   				@Override
   				protected void initChannel(SocketChannel ch) throws Exception {
   					ch.pipeline().addLast(new SimpleClientHandler());
   				}
   			});
   			//发起异步链接操作
   			ChannelFuture channelFuture = bootstrap.connect(host, port).sync();
   			
   			channelFuture.channel().closeFuture().sync();
   		} catch (InterruptedException e) {
   			// TODO Auto-generated catch block
   			e.printStackTrace();
   		}finally{
   			//关闭，释放线程资源
   			group.shutdownGracefully();
   		}
   	}
   	
   	@Test
   	public void nettyClient(){
   		
   		new NettyClient().connect(8989, "localhost");
   	}
   	
   }

   
   
   
3. ServerHander 处理程序 
   
   

   /**
    * 
    * <p>
    * 	Server接收消息处理Handler
    * </p>
    * 
    * @author 卓轩
    * @创建时间：2014年7月7日
    * @version： V1.0
    */
   public class SimpleServerHandler extends ChannelInboundHandlerAdapter {
   
   	@Override
   	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
   
   		ByteBuf buf = (ByteBuf)msg;
   		byte [] req = new byte[buf.readableBytes()];
   		
   		buf.readBytes(req);
   		
   		String message = new String(req,"UTF-8");
   		
   		System.out.println("Netty-Server:Receive Message,"+ message);
   	
   	}
   }

   
   
   
4. ClientHander 处理程序
   
   

   /**
    * 
    * <p>
    * Client Handler
    * </p>
    * 
    * @author 卓轩
    * @创建时间：2014年7月7日
    * @version： V1.0
    */
   public class SimpleClientHandler extends ChannelInboundHandlerAdapter {
   	
   	private ByteBuf clientMessage;
   	
   
   	public SimpleClientHandler() {
   		
   		byte [] req = "Call-User-Service".getBytes();
   		clientMessage = Unpooled.buffer(req.length);
   		clientMessage.writeBytes(req);
   	}
   
   	@Override
   	public void channelActive(ChannelHandlerContext ctx) throws Exception {
   		
   		ctx.writeAndFlush(clientMessage);
   		
   	}
   
   	@Override
   	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
   		ByteBuf buf = (ByteBuf)msg;
   		byte [] req = new byte[buf.readableBytes()];
   		
   		buf.readBytes(req);
   		
   		String message = new String(req,"UTF-8");
   		
   		System.out.println("Netty-Client:Receive Message,"+ message);
   	}
   
   	@Override
   	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
   
   		ctx.close();
   	}
   }

   
   
   

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