The treatment of the netty of the sticky bag

1, Netty in the byte array when the transfer, there will be sticky packets and sub-package situation. When the data is OK, if the amount of data is large. and continuously sent to the server, this time there will be sticky packets and sub-package situation.

2, simple: Channelbuffer in the receiving packet, will be processed at that time, but when the amount of data a large, this time the separation of data is not very obvious. There will be more or less data at this time.

3, the way of processing, is generally a codec. Define your own data: data length + data. This simple way to achieve. The decryption operation is performed on the server.

4, the specific implementation process

A, the client code

Package Com.troy.application.buffer;import Java.io.ioexception;import java.net.inetsocketaddress;import Java.nio.bytebuffer;import Java.nio.channels.SocketChannel; Public classClient { Public Static voidMain (string[] args) {Try{Socketchannel Socketchannel=Socketchannel.open (); Socketchannel.connect (NewInetsocketaddress ("localhost",9000)); //data that needs to be sentString message ="Hello"; //The 4 here represents the byte of the length of the messageBytebuffer Bytebuffer = Bytebuffer.allocate (4+message.length ()); //Setting up dataBytebuffer.putint (Message.length ());            Bytebuffer.put (Message.getbytes ()); //Write DataSocketchannel.write (Bytebuffer.wrap (Bytebuffer.array ())); } Catch(IOException e) {e.printstacktrace (); }    }}

b, the service side

Package Com.troy.application.buffer;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;import Java.net.inetsocketaddress;import Java.util.concurrent.executorservice;import java.util.concurrent.Executors; Public classServer { Public Static voidMain (string[] args) {//declaring a service classServerbootstrap Serverbootstrap =NewServerbootstrap (); //Set Thread poolExecutorservice boss =Executors.newcachedthreadpool (); Executorservice Work=Executors.newcachedthreadpool (); //set up a factoryServerbootstrap.setfactory (Newnioserversocketchannelfactory (boss,work)); //set up pipeline flowServerbootstrap.setpipelinefactory (Newchannelpipelinefactory () {@Override PublicChannelpipeline Getpipeline () throws Exception {Channelpipeline Channelpipeline=Channels.pipeline (); //add a processing methodChannelpipeline.addlast ("Decode",NewPackagedecoder ()); Channelpipeline.addlast ("Hello",NewHellohandler ()); returnChannelpipeline;        }        }); //Setting up PortsServerbootstrap.bind (NewInetsocketaddress (9000)); }}

C, decoding

Package Com.troy.application.buffer;import Org.jboss.netty.buffer.channelbuffer;import Org.jboss.netty.channel.channel;import Org.jboss.netty.channel.channelhandlercontext;import Org.jboss.netty.handler.codec.oneone.OneToOneDecoder; Public classPackagedecoder extends Onetoonedecoder {@OverrideprotectedObject Decode (Channelhandlercontext Channelhandlercontext, Channel Channel, Object O) throws Exception {Chann Elbuffer Channelbuffer=(Channelbuffer) o; if(Channelbuffer.readablebytes () >4) {            //Tag Read locationChannelbuffer.markreaderindex (); //Read Data length            intn =Channelbuffer.readint (); if(Channelbuffer.readablebytes () <N) {//If the data length is less than the set data, the cache stateChannelbuffer.resetreaderindex (); //Cache Current data and wait for data access                return NULL; }            byte[] bytes =New byte[n];            Channelbuffer.readbytes (bytes); return NewString (bytes); }        //Cache Current data and wait for data access        return NULL; }}

d, data reception processing

Package Com.troy.application.buffer;import Org.jboss.netty.channel.channelhandlercontext;import Org.jboss.netty.channel.messageevent;import Org.jboss.netty.channel.SimpleChannelHandler;  Public class Hellohandler extends simplechannelhandler{    @Override    publicvoid  Messagereceived (Channelhandlercontext ctx, messageevent e) throws Exception {        System.  out . println (E.getmessage ());}    }

The treatment of the netty of the sticky bag