工作目录：/home/godu/backup；上传netty-3.2.6.Final.jar； 源文件： EchoServer.java import java.net.InetSocketAddress; import java.util.concurrent.Executors; import org.jboss.netty.bootstrap.ServerBootstrap; import org.jboss.netty.channel.ChannelPipeline; import org.jboss.netty.channel.ChannelPipelineFactory; import org.jboss.netty.channel.Channels; import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory; public class EchoServer { public static void main(String[] args) throws Exception { // Configure the server. ServerBootstrap bootstrap = new ServerBootstrap( new NioServerSocketChannelFactory( Executors.newCachedThreadPool(), Executors.newCachedThreadPool())); // Set up the pipeline factory. bootstrap.setPipelineFactory(new ChannelPipelineFactory() { public ChannelPipeline getPipeline() throws Exception { return Channels.pipeline(new EchoServerHandler()); } }); // Bind and start to accept incoming connections. bootstrap.bind(new InetSocketAddress(8349)); } } EchoServerHandler.java import java.util.concurrent.atomic.AtomicLong; import java.util.logging.Level; import java.util.logging.Logger; import org.jboss.netty.buffer.ChannelBuffer; import org.jboss.netty.channel.ChannelHandlerContext; import org.jboss.netty.channel.ExceptionEvent; import org.jboss.netty.channel.MessageEvent; import org.jboss.netty.channel.SimpleChannelUpstreamHandler; public class EchoServerHandler extends SimpleChannelUpstreamHandler { private static final Logger logger = Logger .getLogger(EchoServerHandler.class.getName()); private final AtomicLong transferredBytes = new AtomicLong(); public long getTransferredBytes() { return transferredBytes.get(); } @Override public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) { // Send back the received message to the remote peer. transferredBytes.addAndGet(((ChannelBuffer) e.getMessage()) .readableBytes()); e.getChannel().write(e.getMessage()); } @Override public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) { // Close the connection when an exception is raised. logger.log(Level.WARNING, "Unexpected exception from downstream.", e.getCause()); e.getChannel().close(); } } 启动Echo Server： javac -cp .:./netty-3.2.6.Final.jar EchoServerHandler.java javac -cp .:./netty-3.2.6.Final.jar EchoServer.java java -cp .:./netty-3.2.6.Final.jar EchoServer
连接Server：XShell里运行： telnet 10.0.2.47 8349 ，建立连接后输入 bcde 并回车后可以看到收到了bcde，整个过程用wireshark监控内容如下（监控完后导出结果方法：File->Export->File，保存类型为txt）： No. Time Source Destination Protocol Length Info 1 0.000000 10.32.1.103 10.0.2.47 TCP 66 10811 > 8394 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1 Frame 1: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) Ethernet II, Src: Dell_22:74:95 (b8:ac:6f:22:74:95), Dst: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1) Internet Protocol Version 4, Src: 10.32.1.103 (10.32.1.103), Dst: 10.0.2.47 (10.0.2.47) Transmission Control Protocol, Src Port: 10811 (10811), Dst Port: 8394 (8394), Seq: 0, Len: 0 Source port: 10811 (10811) Destination port: 8394 (8394) [Stream index: 0] Sequence number: 0 (relative sequence number) Header length: 32 bytes Flags: 0x02 (SYN) Window size value: 8192 [Calculated window size: 8192] Checksum: 0x976d [validation disabled] Options: (12 bytes) No. Time Source Destination Protocol Length Info 2 0.000267 10.0.2.47 10.32.1.103 TCP 66 8394 > 10811 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460 SACK_PERM=1 WS=128 Frame 2: 66 bytes on wire (528 bits), 66 bytes captured (528 bits) Ethernet II, Src: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1), Dst: Dell_22:74:95 (b8:ac:6f:22:74:95) Internet Protocol Version 4, Src: 10.0.2.47 (10.0.2.47), Dst: 10.32.1.103 (10.32.1.103) Transmission Control Protocol, Src Port: 8394 (8394), Dst Port: 10811 (10811), Seq: 0, Ack: 1, Len: 0 Source port: 8394 (8394) Destination port: 10811 (10811) [Stream index: 0] Sequence number: 0 (relative sequence number) Acknowledgement number: 1 (relative ack number) Header length: 32 bytes Flags: 0x12 (SYN, ACK) Window size value: 5840 [Calculated window size: 5840] Checksum: 0x0552 [validation disabled] Options: (12 bytes) [SEQ/ACK analysis] No. Time Source Destination Protocol Length Info 3 0.000295 10.32.1.103 10.0.2.47 TCP 54 10811 > 8394 [ACK] Seq=1 Ack=1 Win=65536 Len=0 Frame 3: 54 bytes on wire (432 bits), 54 bytes captured (432 bits) Ethernet II, Src: Dell_22:74:95 (b8:ac:6f:22:74:95), Dst: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1) Internet Protocol Version 4, Src: 10.32.1.103 (10.32.1.103), Dst: 10.0.2.47 (10.0.2.47) Transmission Control Protocol, Src Port: 10811 (10811), Dst Port: 8394 (8394), Seq: 1, Ack: 1, Len: 0 Source port: 10811 (10811) Destination port: 8394 (8394) [Stream index: 0] Sequence number: 1 (relative sequence number) Acknowledgement number: 1 (relative ack number) Header length: 20 bytes Flags: 0x10 (ACK) Window size value: 256 [Calculated window size: 65536] [Window size scaling factor: 256] Checksum: 0x5bf4 [validation disabled] [SEQ/ACK analysis] No. Time Source Destination Protocol Length Info 4 5.669101 10.32.1.103 10.0.2.47 TCP 58 10811 > 8394 [PSH, ACK] Seq=1 Ack=1 Win=65536 Len=4 Frame 4: 58 bytes on wire (464 bits), 58 bytes captured (464 bits) Ethernet II, Src: Dell_22:74:95 (b8:ac:6f:22:74:95), Dst: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1) Internet Protocol Version 4, Src: 10.32.1.103 (10.32.1.103), Dst: 10.0.2.47 (10.0.2.47) Transmission Control Protocol, Src Port: 10811 (10811), Dst Port: 8394 (8394), Seq: 1, Ack: 1, Len: 4 Source port: 10811 (10811) Destination port: 8394 (8394) [Stream index: 0] Sequence number: 1 (relative sequence number) [Next sequence number: 5 (relative sequence number)] Acknowledgement number: 1 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size value: 256 [Calculated window size: 65536] [Window size scaling factor: 256] Checksum: 0x951f [validation disabled] [SEQ/ACK analysis] Data (4 bytes) 0000 62 63 64 65 bcde Data: 62636465 [Length: 4] No. Time Source Destination Protocol Length Info 5 5.669359 10.0.2.47 10.32.1.103 TCP 60 8394 > 10811 [ACK] Seq=1 Ack=5 Win=5888 Len=0 Frame 5: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Ethernet II, Src: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1), Dst: Dell_22:74:95 (b8:ac:6f:22:74:95) Internet Protocol Version 4, Src: 10.0.2.47 (10.0.2.47), Dst: 10.32.1.103 (10.32.1.103) Transmission Control Protocol, Src Port: 8394 (8394), Dst Port: 10811 (10811), Seq: 1, Ack: 5, Len: 0 Source port: 8394 (8394) Destination port: 10811 (10811) [Stream index: 0] Sequence number: 1 (relative sequence number) Acknowledgement number: 5 (relative ack number) Header length: 20 bytes Flags: 0x10 (ACK) Window size value: 46 [Calculated window size: 5888] [Window size scaling factor: 128] Checksum: 0x5cc2 [validation disabled] [SEQ/ACK analysis] No. Time Source Destination Protocol Length Info 6 5.669397 10.32.1.103 10.0.2.47 TCP 56 10811 > 8394 [PSH, ACK] Seq=5 Ack=1 Win=65536 Len=2 Frame 6: 56 bytes on wire (448 bits), 56 bytes captured (448 bits) Ethernet II, Src: Dell_22:74:95 (b8:ac:6f:22:74:95), Dst: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1) Internet Protocol Version 4, Src: 10.32.1.103 (10.32.1.103), Dst: 10.0.2.47 (10.0.2.47) Transmission Control Protocol, Src Port: 10811 (10811), Dst Port: 8394 (8394), Seq: 5, Ack: 1, Len: 2 Source port: 10811 (10811) Destination port: 8394 (8394) [Stream index: 0] Sequence number: 5 (relative sequence number) [Next sequence number: 7 (relative sequence number)] Acknowledgement number: 1 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size value: 256 [Calculated window size: 65536] [Window size scaling factor: 256] Checksum: 0x4edc [validation disabled] [SEQ/ACK analysis] Data (2 bytes) 0000 0d 0a .. Data: 0d0a [Length: 2] No. Time Source Destination Protocol Length Info 7 5.669574 10.0.2.47 10.32.1.103 TCP 60 8394 > 10811 [ACK] Seq=1 Ack=7 Win=5888 Len=0 Frame 7: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Ethernet II, Src: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1), Dst: Dell_22:74:95 (b8:ac:6f:22:74:95) Internet Protocol Version 4, Src: 10.0.2.47 (10.0.2.47), Dst: 10.32.1.103 (10.32.1.103) Transmission Control Protocol, Src Port: 8394 (8394), Dst Port: 10811 (10811), Seq: 1, Ack: 7, Len: 0 Source port: 8394 (8394) Destination port: 10811 (10811) [Stream index: 0] Sequence number: 1 (relative sequence number) Acknowledgement number: 7 (relative ack number) Header length: 20 bytes Flags: 0x10 (ACK) Window size value: 46 [Calculated window size: 5888] [Window size scaling factor: 128] Checksum: 0x5cc0 [validation disabled] [SEQ/ACK analysis] No. Time Source Destination Protocol Length Info 8 5.682922 10.0.2.47 10.32.1.103 TCP 60 8394 > 10811 [PSH, ACK] Seq=1 Ack=7 Win=5888 Len=6 Frame 8: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) Ethernet II, Src: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1), Dst: Dell_22:74:95 (b8:ac:6f:22:74:95) Internet Protocol Version 4, Src: 10.0.2.47 (10.0.2.47), Dst: 10.32.1.103 (10.32.1.103) Transmission Control Protocol, Src Port: 8394 (8394), Dst Port: 10811 (10811), Seq: 1, Ack: 7, Len: 6 Source port: 8394 (8394) Destination port: 10811 (10811) [Stream index: 0] Sequence number: 1 (relative sequence number) [Next sequence number: 7 (relative sequence number)] Acknowledgement number: 7 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) Window size value: 46 [Calculated window size: 5888] [Window size scaling factor: 128] Checksum: 0x88df [validation disabled] [SEQ/ACK analysis] Data (6 bytes) 0000 62 63 64 65 0d 0a bcde.. Data: 626364650d0a [Length: 6] No. Time Source Destination Protocol Length Info 9 5.887726 10.32.1.103 10.0.2.47 TCP 54 10811 > 8394 [ACK] Seq=7 Ack=7 Win=65536 Len=0 Frame 9: 54 bytes on wire (432 bits), 54 bytes captured (432 bits) Ethernet II, Src: Dell_22:74:95 (b8:ac:6f:22:74:95), Dst: Hangzhou_8d:96:e1 (00:0f:e2:8d:96:e1) Internet Protocol Version 4, Src: 10.32.1.103 (10.32.1.103), Dst: 10.0.2.47 (10.0.2.47) Transmission Control Protocol, Src Port: 10811 (10811), Dst Port: 8394 (8394), Seq: 7, Ack: 7, Len: 0 Source port: 10811 (10811) Destination port: 8394 (8394) [Stream index: 0] Sequence number: 7 (relative sequence number) Acknowledgement number: 7 (relative ack number) Header length: 20 bytes Flags: 0x10 (ACK) Window size value: 256 [Calculated window size: 65536] [Window size scaling factor: 256] Checksum: 0x5be8 [validation disabled] [SEQ/ACK analysis] 可以看到第4个包是C向S发送bcde，第6个是向S发送回车，第8个包是S向C返回bcde回车；