模拟半包，为什么结果还是黏包？

Question

黑马程序员nettyP91
模拟半包

服务器端

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import lombok.extern.slf4j.Slf4j;


@Slf4j
public class HelloWorldServer {
    void start() {
        NioEventLoopGroup boss = new NioEventLoopGroup();
        NioEventLoopGroup worker = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.channel(NioServerSocketChannel.class);
            serverBootstrap.option(ChannelOption.SO_RCVBUF, 10);
            serverBootstrap.group(boss, worker);
            serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    ch.pipeline().addLast(new LoggingHandler(LogLevel.DEBUG));
                }
            });
            ChannelFuture channelFuture = serverBootstrap.bind(8080).sync();
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            log.error("server error", e);
        } finally {
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    }

    public static void main(String[] args) {
        new HelloWorldServer().start();
    }
} 

客户端

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Random;

public class HelloWorldClient {
    static final Logger log = LoggerFactory.getLogger(HelloWorldClient.class);

    public static void main(String[] args) {
        NioEventLoopGroup worker = new NioEventLoopGroup();
        try {
            Bootstrap bootstrap = new Bootstrap();
            bootstrap.channel(NioSocketChannel.class);
            bootstrap.group(worker);
            bootstrap.handler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {

                        // 会在连接 channel 建立成功后，会触发 active 事件
                        @Override
                        public void channelActive(ChannelHandlerContext ctx) throws Exception {
                            ByteBuf buffer = ctx.alloc().buffer();
                            for (int i = 0; i < 10; i++) {
                                buffer.writeBytes(new byte[]{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15});
                            }
                            ctx.writeAndFlush(buffer);
                        }
                    });
                }
            });
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 8080).sync();
            channelFuture.channel().closeFuture().sync();

        } catch (InterruptedException e) {
            log.error("client error", e);
        } finally {
            worker.shutdownGracefully();
        }
    }
}

为什么还是黏包？

按照视频添加了

按照笔记修改了，也出不了他给的结果

Answer 1

【相关推荐】

• 建议你看下这篇博客👉 ：【Netty4 简单项目实践】八、转发服务的实现方案
• 除此之外, 这篇博客: 分布式专题｜纠结了两天，还是决定把这篇文章放出来（小白必看netty入门教程，图很多）中的 创客户端自定义处理器 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
  

  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  import io.netty.util.CharsetUtil;
  
  public class NettyClientHandler extends ChannelInboundHandlerAdapter {
  
      @Override
      public void channelActive(ChannelHandlerContext ctx) throws Exception {
          ByteBuf buf = Unpooled.copiedBuffer("HelloServer", CharsetUtil.UTF_8);
          ctx.writeAndFlush(buf);
      }
  
      @Override
      public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
          ByteBuf msg1 = (ByteBuf) msg;
          System.out.println(String.format("收到服户端(%s)消息:%s", ctx.channel().remoteAddress().toString(), msg1.toString(CharsetUtil.UTF_8)));
      }
  
  }
  

如果你已经解决了该问题, 非常希望你能够分享一下解决方案, 写成博客, 将相关链接放在评论区, 以帮助更多的人 ^-^