netty拆包粘包问题处理

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public classServerHandler extends ChannelHandlerAdapter {

    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {       String request = (String)msg;        System.out.println("Server:"+request);        String response = "服务器响应数据:"+msg+"$_";        ctx.writeAndFlush(Unpooled.copiedBuffer(response.getBytes()));    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {        cause.printStackTrace();        ctx.close();    }}

public class Server {    public static void main(String[] args) throws Exception {        //第一个线程组 接受client端        EventLoopGroup bossGroup = new NioEventLoopGroup();        //第二个线程组 实际业务处理        EventLoopGroup workerGroup = new NioEventLoopGroup();        //3 创建一个辅助类Bootstrap，就是对我们的Server进行一系列的配置        ServerBootstrap b = new ServerBootstrap();        //把两个工作线程组加进来        b.group(bossGroup, workerGroup)        //指定使用NioServerSocketChannel                .channel(NioServerSocketChannel.class)        //一定要使用 childHandler 去绑定具体的 事件处理器                .childHandler(new ChannelInitializer<SocketChannel>() {                    @Override                    protected void initChannel(SocketChannel sc) throws Exception {                        ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());                        sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,buf));                        sc.pipeline().addLast(new StringDecoder());                        sc.pipeline().addLast(new ServerHandler());//这里可以加多个处理器                    }                });        //设置tcp的缓冲区        // .option(ChannelOption.SO_BACKLOG, 128)        //保持连接        //     .option(ChannelOption.SO_KEEPALIVE, true);        //绑定指定端口 进行监听        ChannelFuture f = b.bind(8920).sync();        Thread.sleep(1000000);        bossGroup.shutdownGracefully();        workerGroup.shutdownGracefully();    }}

public class ClientHandler extends ChannelHandlerAdapter {    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg)            throws Exception {        try{            String request = (String)msg;            System.out.println("client:"+request);        } finally {//没有调用write方法 需要手动释放            ReferenceCountUtil.release(msg);        }    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)            throws Exception {        cause.printStackTrace();        ctx.close();    }}

public class Client {    public static void main(String[] args) throws Exception {        EventLoopGroup workGroup = new NioEventLoopGroup();        Bootstrap b = new Bootstrap();        b.group(workGroup)                .channel(NioSocketChannel.class)                .handler(new ChannelInitializer<SocketChannel>() {                    @Override                    protected void initChannel(SocketChannel sc) throws Exception {                        ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());                        sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,buf));                        sc.pipeline().addLast(new StringDecoder());                        sc.pipeline().addLast(new ClientHandler());                    }                });        ChannelFuture f = b.connect("127.0.0.1",8920).sync();//buf        f.channel().write(Unpooled.copiedBuffer(Unpooled.wrappedBuffer("bbb1$_".getBytes())));        f.channel().write(Unpooled.copiedBuffer(Unpooled.wrappedBuffer("bbb2$_".getBytes())));        f.channel().write(Unpooled.copiedBuffer(Unpooled.wrappedBuffer("bbb3$_".getBytes())));        f.channel().flush();// f.channel().flush();        f.channel().closeFuture().sync();        workGroup.shutdownGracefully();    }}

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