Merge branch 'master' of https://github.com/waylau/essential-netty-in-action

Author: skyleft

CORE FUNCTIONS/Decoding delimited and length-based protocols.md

@@ -27,5 +27,25 @@ Figure 8.5 Handling delimited frames
 下面展示了如何用 LineBasedFrameDecoder 处理
 
 Listing 8.8 Handling line-delimited frames
-
+    
+    public class LineBasedHandlerInitializer extends ChannelInitializer<Channel> {
+    
+        @Override
+        protected void initChannel(Channel ch) throws Exception {
+            ChannelPipeline pipeline = ch.pipeline();
+            pipeline.addLast(new LineBasedFrameDecoder(65 * 1024));   //1
+            pipeline.addLast(new FrameHandler());  //2
+        }
+    
+        public static final class FrameHandler extends SimpleChannelInboundHandler<ByteBuf> {
+            @Override
+            public void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {  //3
+                // Do something with the frame
+            }
+        }
+    }
+
+1. 添加一个 LineBasedFrameDecoder 用于提取帧并把数据包转发到下一个管道中的处理程序,在这种情况下就是 FrameHandler  
+2. 添加 FrameHandler 用于接收帧
+3. 每次调用都需要传递一个单帧的内容