diff --git a/src/main/java/com/kwan/shuyu/heima/netty_06_pipeline/Server.java b/src/main/java/com/kwan/shuyu/heima/netty_06_pipeline/Server.java
index 0549d32de291b135591ab77c9e680dd4afc9b109..3fe7e9038c00ca003f11ff384df4fde867771158 100644
--- a/src/main/java/com/kwan/shuyu/heima/netty_06_pipeline/Server.java
+++ b/src/main/java/com/kwan/shuyu/heima/netty_06_pipeline/Server.java
@@ -52,6 +52,7 @@ public class Server {
                             public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                 log.info("3");
                                 log.info("h3结果{},class={}", msg, msg.getClass());
+                                //入栈处理器最后的写入,供出栈处理器读取
                                 ch.writeAndFlush(ctx.alloc().buffer().writeBytes("server...".getBytes()));
                             }
                         });
diff --git a/src/main/java/com/kwan/shuyu/heima/netty_06_pipeline/TestEmbeddedChannel.java b/src/main/java/com/kwan/shuyu/heima/netty_06_pipeline/TestEmbeddedChannel.java
new file mode 100644
index 0000000000000000000000000000000000000000..57b653f74b05893582282f05aa00a136e386acf4
--- /dev/null
+++ b/src/main/java/com/kwan/shuyu/heima/netty_06_pipeline/TestEmbeddedChannel.java
@@ -0,0 +1,80 @@
+package com.kwan.shuyu.heima.netty_06_pipeline;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.ChannelOutboundHandlerAdapter;
+import io.netty.channel.ChannelPromise;
+import io.netty.channel.embedded.EmbeddedChannel;
+import lombok.extern.slf4j.Slf4j;
+
+import java.nio.charset.Charset;
+
+/**
+ * netty提供的 EmbeddedChannel 测试方法
+ * 可以 绑定 很多的 handler 进行测试
+ * <p>
+ * <p>
+ * 入站：服务端 处理 客户端 write事件
+ */
+@Slf4j
+public class TestEmbeddedChannel {
+    public static void main(String[] args) {
+        // 1. 入站
+        ChannelInboundHandlerAdapter h1 = new ChannelInboundHandlerAdapter() {
+            @Override
+            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+                log.info("1");
+                super.channelRead(ctx, msg);
+            }
+        };
+        // 2. 入站
+        ChannelInboundHandlerAdapter h2 = new ChannelInboundHandlerAdapter() {// 当前handler起名 h2
+            @Override
+            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+                log.info("2");
+                super.channelRead(ctx, msg);
+            }
+        };
+        // 3. 入站
+        ChannelInboundHandlerAdapter h3 = new ChannelInboundHandlerAdapter() {
+            @Override
+            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+                log.info("3333333333333333");
+                ctx.channel().writeAndFlush(msg);   //  【最后一个handler往前找】
+                // ctx.writeAndFlush(msg);   //  【当前节点往上找 出站处理器】
+            }
+        };
+        // 4. 出站
+        ChannelOutboundHandlerAdapter h4 = new ChannelOutboundHandlerAdapter() {
+            @Override
+            public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+                log.info("4");
+                super.write(ctx, msg, promise);
+            }
+        };
+        // 5. 出站
+        ChannelOutboundHandlerAdapter h5 = new ChannelOutboundHandlerAdapter() {
+            @Override
+            public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
+                log.info("5");
+                super.write(ctx, msg, promise);
+            }
+        };
+        final EmbeddedChannel channel = new EmbeddedChannel(h1, h2, h3, h4, h5);
+        // 模拟 入站
+        channel.writeInbound(ByteBufAllocator.DEFAULT.buffer().writeBytes("hello".getBytes()));
+        System.out.println(((ByteBuf) channel.readOutbound()).toString(Charset.defaultCharset()));
+
+        /**
+         * 输出结果
+         * [main] INFO com.kwan.shuyu.heima.netty_06_pipeline.TestEmbeddedChannel - 1
+         * [main] INFO com.kwan.shuyu.heima.netty_06_pipeline.TestEmbeddedChannel - 2
+         * [main] INFO com.kwan.shuyu.heima.netty_06_pipeline.TestEmbeddedChannel - 3333333333333333
+         * [main] INFO com.kwan.shuyu.heima.netty_06_pipeline.TestEmbeddedChannel - 5
+         * [main] INFO com.kwan.shuyu.heima.netty_06_pipeline.TestEmbeddedChannel - 4
+         * hello
+         */
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_01.java b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_01.java
new file mode 100644
index 0000000000000000000000000000000000000000..7f323dee4f9c8741a64d21ad63fcfde55bb54014
--- /dev/null
+++ b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_01.java
@@ -0,0 +1,68 @@
+package com.kwan.shuyu.heima.netty_07_bytebuf;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+
+import static io.netty.buffer.ByteBufUtil.appendPrettyHexDump;
+import static io.netty.util.internal.StringUtil.NEWLINE;
+
+/**
+ * 测试 ByteBuf  扩容
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/27 09:34
+ */
+public class ByteBuf_01 {
+
+    public static void main(String[] args) {
+        ByteBuf buf = ByteBufAllocator.DEFAULT.buffer();
+        log(buf);
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < 300; i++) {
+            sb.append("a");
+        }
+        buf.writeBytes(sb.toString().getBytes());
+        log(buf);
+
+        /**
+         * PooledUnsafeDirectByteBuf(ridx: 0, widx: 0, cap: 256)
+         * read index:0 write index:300 capacity:512
+         *          +-------------------------------------------------+
+         *          |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+         * +--------+-------------------------------------------------+----------------+
+         * |00000000| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000010| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000020| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000030| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000040| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000050| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000060| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000070| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000080| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000090| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |000000a0| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |000000b0| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |000000c0| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |000000d0| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |000000e0| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |000000f0| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000100| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000110| 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 |aaaaaaaaaaaaaaaa|
+         * |00000120| 61 61 61 61 61 61 61 61 61 61 61 61             |aaaaaaaaaaaa    |
+         * +--------+-------------------------------------------------+----------------+
+         */
+    }
+
+    private static void log(ByteBuf buffer) {
+        int length = buffer.readableBytes();
+        int rows = length / 16 + (length % 15 == 0 ? 0 : 1) + 4;
+        StringBuilder buf = new StringBuilder(rows * 80 * 2)
+                .append("read index:").append(buffer.readerIndex())
+                .append(" write index:").append(buffer.writerIndex())
+                .append(" capacity:").append(buffer.capacity())
+                .append(NEWLINE);
+        appendPrettyHexDump(buf, buffer);
+        System.out.println(buf.toString());
+    }
+}
diff --git a/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_02.java b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_02.java
new file mode 100644
index 0000000000000000000000000000000000000000..102390d248e6aa5cd74d52c26557d52c81099b2d
--- /dev/null
+++ b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_02.java
@@ -0,0 +1,38 @@
+package com.kwan.shuyu.heima.netty_07_bytebuf;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+
+import static io.netty.buffer.ByteBufUtil.appendPrettyHexDump;
+import static io.netty.util.internal.StringUtil.NEWLINE;
+
+/**
+ * ByteBuf  创建
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/27 09:34
+ */
+public class ByteBuf_02 {
+
+    public static void main(String[] args) {
+        ByteBuf buffer = ByteBufAllocator.DEFAULT.buffer(10);
+        log(buffer);
+        //上面代码创建了一个默认的ByteBuf（池化基于直接内存的 ByteBuf)，初始容量是10
+        /**
+         * read index:0 write index:0 capacity:10
+         */
+    }
+
+    private static void log(ByteBuf buffer) {
+        int length = buffer.readableBytes();
+        int rows = length / 16 + (length % 15 == 0 ? 0 : 1) + 4;
+        StringBuilder buf = new StringBuilder(rows * 80 * 2)
+                .append("read index:").append(buffer.readerIndex())
+                .append(" write index:").append(buffer.writerIndex())
+                .append(" capacity:").append(buffer.capacity())
+                .append(NEWLINE);
+        appendPrettyHexDump(buf, buffer);
+        System.out.println(buf.toString());
+    }
+}
diff --git a/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_03.java b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_03.java
new file mode 100644
index 0000000000000000000000000000000000000000..703cfa8215b9685a06082fc16f6bf53ef7dd02b2
--- /dev/null
+++ b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_03.java
@@ -0,0 +1,48 @@
+package com.kwan.shuyu.heima.netty_07_bytebuf;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+import lombok.extern.slf4j.Slf4j;
+
+import static io.netty.buffer.ByteBufUtil.appendPrettyHexDump;
+import static io.netty.util.internal.StringUtil.NEWLINE;
+
+/**
+ * ByteBuf  的类型打印
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/27 09:34
+ */
+@Slf4j
+public class ByteBuf_03 {
+
+    public static void main(String[] args) {
+        ByteBuf buffer = ByteBufAllocator.DEFAULT.buffer(10);
+        ByteBuf buffer1 = ByteBufAllocator.DEFAULT.heapBuffer(10);
+        ByteBuf buffer2 = ByteBufAllocator.DEFAULT.directBuffer(10);
+        log.info(buffer.getClass().getSimpleName());
+        log.info(buffer1.getClass().getSimpleName());
+        log.info(buffer2.getClass().getSimpleName());
+        log(buffer);
+        //上面代码创建了一个默认的ByteBuf（池化基于直接内存的 ByteBuf)，初始容量是10
+        /**
+         [main] INFO com.kwan.shuyu.heima.netty_07_bytebuf.ByteBuf_03 - PooledUnsafeDirectByteBuf
+         [main] INFO com.kwan.shuyu.heima.netty_07_bytebuf.ByteBuf_03 - PooledUnsafeHeapByteBuf
+         [main] INFO com.kwan.shuyu.heima.netty_07_bytebuf.ByteBuf_03 - PooledUnsafeDirectByteBuf
+         read index:0 write index:0 capacity:10
+         */
+    }
+
+    private static void log(ByteBuf buffer) {
+        int length = buffer.readableBytes();
+        int rows = length / 16 + (length % 15 == 0 ? 0 : 1) + 4;
+        StringBuilder buf = new StringBuilder(rows * 80 * 2)
+                .append("read index:").append(buffer.readerIndex())
+                .append(" write index:").append(buffer.writerIndex())
+                .append(" capacity:").append(buffer.capacity())
+                .append(NEWLINE);
+        appendPrettyHexDump(buf, buffer);
+        System.out.println(buf.toString());
+    }
+}
diff --git a/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_04.java b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_04.java
new file mode 100644
index 0000000000000000000000000000000000000000..ebc265f0c1d19b5cf3a0071109563697b186a7da
--- /dev/null
+++ b/src/main/java/com/kwan/shuyu/heima/netty_07_bytebuf/ByteBuf_04.java
@@ -0,0 +1,66 @@
+package com.kwan.shuyu.heima.netty_07_bytebuf;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+import lombok.extern.slf4j.Slf4j;
+
+import static io.netty.buffer.ByteBufUtil.appendPrettyHexDump;
+import static io.netty.util.internal.StringUtil.NEWLINE;
+
+/**
+ * ByteBuf  数据写入
+ *
+ * @author : qinyingjie
+ * @version : 2.2.0
+ * @date : 2023/4/27 09:34
+ */
+@Slf4j
+public class ByteBuf_04 {
+
+    public static void main(String[] args) {
+        ByteBuf buffer = ByteBufAllocator.DEFAULT.buffer(10);
+        buffer.writeBytes(new byte[]{1, 2, 3, 4});
+        log(buffer);
+        //上面代码创建了一个默认的ByteBuf（池化基于直接内存的 ByteBuf)，初始容量是10
+        /**
+         * read index:0 write index:4 capacity:10
+         *          +-------------------------------------------------+
+         *          |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+         * +--------+-------------------------------------------------+----------------+
+         * |00000000| 01 02 03 04                                     |....            |
+         * +--------+-------------------------------------------------+----------------+
+         */
+        buffer.writeInt(5);//int占四个字节
+        log(buffer);
+        /**
+         * read index:0 write index:8 capacity:10
+         *          +-------------------------------------------------+
+         *          |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+         * +--------+-------------------------------------------------+----------------+
+         * |00000000| 01 02 03 04 00 00 00 05                         |........        |
+         * +--------+-------------------------------------------------+----------------+
+         */
+        buffer.setInt(0, 5);//int占四个字节,不会改变写指针,会出现数据覆盖
+        log(buffer);
+        /**
+         * read index:0 write index:8 capacity:10
+         *          +-------------------------------------------------+
+         *          |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+         * +--------+-------------------------------------------------+----------------+
+         * |00000000| 00 00 00 05 00 00 00 05                         |........        |
+         * +--------+-------------------------------------------------+----------------+
+         */
+    }
+
+    private static void log(ByteBuf buffer) {
+        int length = buffer.readableBytes();
+        int rows = length / 16 + (length % 15 == 0 ? 0 : 1) + 4;
+        StringBuilder buf = new StringBuilder(rows * 80 * 2)
+                .append("read index:").append(buffer.readerIndex())
+                .append(" write index:").append(buffer.writerIndex())
+                .append(" capacity:").append(buffer.capacity())
+                .append(NEWLINE);
+        appendPrettyHexDump(buf, buffer);
+        System.out.println(buf.toString());
+    }
+}
diff --git a/src/main/java/com/kwan/shuyu/until/ByteBufferUtil.java b/src/main/java/com/kwan/shuyu/until/ByteBufferUtil.java
index 25b00a0ca38bb9aa3e9b689c5c5f816d22d717cc..33192fe7d29a096afd56d9922e3d3655f9ef3d0c 100644
--- a/src/main/java/com/kwan/shuyu/until/ByteBufferUtil.java
+++ b/src/main/java/com/kwan/shuyu/until/ByteBufferUtil.java
@@ -1,10 +1,12 @@
 package com.kwan.shuyu.until;
 
+import io.netty.buffer.ByteBuf;
 import io.netty.util.internal.StringUtil;
 
 import java.nio.ByteBuffer;
 
 import static io.netty.util.internal.MathUtil.isOutOfBounds;
+import static io.netty.util.internal.StringUtil.NEWLINE;
 
 /**
  * ByteBuffer工具类
@@ -167,4 +169,6 @@ public class ByteBufferUtil {
     public static short getUnsignedByte(ByteBuffer buffer, int index) {
         return (short) (buffer.get(index) & 0xFF);
     }
+
+
 }
\ No newline at end of file
diff --git a/target/classes/com/kwan/shuyu/until/ByteBufferUtil.class b/target/classes/com/kwan/shuyu/until/ByteBufferUtil.class
index 0933393e770b52c7d1b9fac920b16d4bb511b4a4..d3d285f58e9fcf7dc9bb8bebae727050e60bc8aa 100644
Binary files a/target/classes/com/kwan/shuyu/until/ByteBufferUtil.class and b/target/classes/com/kwan/shuyu/until/ByteBufferUtil.class differ