Netty实战-对象编解码，Netty对象网络传递

书籍推荐：

       实例代码 ： http://download.youkuaiyun.com/detail/jiangtao_st/7677503

1. Server端代码
   

   <span style="font-size:12px;">/**
    * 
    * <p>
    * 	Netty Server Simple
    * </p>
    * 
    * LineBasedFrameDecoder + 消息中得换行符
    * 	
    * @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 LineBasedFrameDecoder(1024));
   //			
   //			ByteBuf delimiter = Unpooled.copiedBuffer("$_".getBytes());
   //			ch.pipeline().addLast(new DelimiterBasedFrameDecoder(2048, delimiter));
   //			
   			//ch.pipeline().addLast(new FixedLengthFrameDecoder(20));
   			ch.pipeline().addLast(new ObjectDecoder(1024*1024,ClassResolvers.weakCachingConcurrentResolver(this.getClass().getClassLoader())));
   			ch.pipeline().addLast(new ObjectEncoder());
   			ch.pipeline().addLast(new StringDecoder());
   			ch.pipeline().addLast(new UserRespServerHandler());
   		}
   	}
   	
   	
   }</span>

2. Client端代码
   

   <span style="font-size:12px;">/**
    * 
    * <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 ObjectDecoder(1024,ClassResolvers.weakCachingConcurrentResolver(this.getClass().getClassLoader())));
   					ch.pipeline().addLast(new ObjectEncoder());
   					
   					ch.pipeline().addLast(new StringDecoder());
   					ch.pipeline().addLast(new UserQueryClientHandler());
   				}
   			});
   			//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");
   	}
   }</span>

3. ServerHander 代码
   

   <span style="font-size:12px;">/**
    * 
    * <p>
    *  用户查询返回
    * </p>
    * 
    * @author 卓轩
    * @创建时间：2014年7月7日
    * @version： V1.0
    */
   public class UserRespServerHandler extends ChannelInboundHandlerAdapter {
   
   
   	@Override
   	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
   		
   		UserQuery userQuery = (UserQuery) msg;
   		
   		System.out.println("收到来自客户端的查询请求:"+ String.valueOf(userQuery));
   		
   		if(userQuery != null && userQuery.getUserId()!= 0){
   			UserDO userDO = getUserById(userQuery.getUserId());
   			ctx.writeAndFlush(userDO);
   		}
   	}
   
   	@Override
   	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
   		
   		System.out.println("Server has Exception,"+ cause.getCause());
   	
   	}
   	
   	
   	private UserDO getUserById(int userId){
   		
   		if(userId % 2 == 0){
   			UserDO zhuoxuan = new UserDO();
   			zhuoxuan.setUserId(userId);
   			zhuoxuan.setSex(1);
   			zhuoxuan.setUname("卓轩");
   			zhuoxuan.setUnick("zhuoxuan");
   			zhuoxuan.setEmail("zhuoxuan@mogujie.com");
   			return zhuoxuan;
   		}else{
   			UserDO zhuoxuan = new UserDO();
   			zhuoxuan.setUserId(userId);
   			zhuoxuan.setSex(1);
   			zhuoxuan.setUname("张三");
   			zhuoxuan.setUnick("zhangsan");
   			zhuoxuan.setEmail("zhuoxuan@mogujie.com");
   			return zhuoxuan;
   		}	
   	}
   }</span><strong style="font-size: 14px;">
   </strong>

   
   
4. ClientHander 代码

<span style="font-size:12px;">/**
 * 
 * <p>
 * 用户查询请求 Handler
 * </p>
 * 
 * @author 卓轩
 * @创建时间：2014年7月7日
 * @version： V1.0
 */
public class UserQueryClientHandler extends ChannelInboundHandlerAdapter {
	
	

	public UserQueryClientHandler() {
		
	}

	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		
		for (int i = 0; i < 100; i++) {
			UserQuery userQuery = new UserQuery();
			userQuery.setUserId(1001+i);
			ctx.write(userQuery);
		}
		ctx.flush();
		
	}

	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		
		String message = String.valueOf(msg);
		
		System.out.println("Netty-Client:Receive Message,"+ message);
	}
	
	

	@Override
	public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
		ctx.flush();
	}
	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

		System.out.println("Client has Exception,"+ cause.getCause());
	}
}</span>