"Java Network Programming" UDP-based chat communication

Using the UDP protocol, write a command-line-based chat software, and the client and the server can send data to each other after the command line is started, respectively.

First, create Threads Sendthread and Receivethread

1  PackageCom.fhcq.chat;2 3 //Duplex Chat program4 //Can send data, but also can wait to receive data5 //need to use multithreading to implement6 7  Public classQicqdemo {8 9      Public Static voidMain (string[] args) {Ten         //TODO auto-generated method stub One  ASend send =NewSend (); -Receive receive =NewReceive (); -  theThread Sendthread =NewThread (send); -Thread Receivethread =NewThread (receive); -  -Sendthread.start (); +Receivethread.start (); -} +} A 

Java Code

Second, the use of thread sendthread to achieve the transmission of information

1  PackageCom.fhcq.chat;2 3 ImportJava.io.IOException;4 ImportJava.net.DatagramPacket;5 ImportJava.net.DatagramSocket;6 Importjava.net.InetAddress;7 ImportJava.net.SocketException;8 ImportJava.net.UnknownHostException;9 ImportJava.util.Scanner;Ten  One  Public classSendImplementsRunnable { A  -@Override -      Public voidRun () { the         //TODO auto-generated method stub -  -         Try{ -Datagramsocket Datagramsocket =NewDatagramsocket (); +InetAddress inetaddress = Inetaddress.getbyname ("Congkick"); -Scanner Scanner =NewScanner (system.in); +              while(true){ A                 //Blocking atString nextline = Scanner.nextline (); -               byte[] bytes = Nextline.getbytes (); -Datagrampacket Datagrampacket =NewDatagrampacket -(bytes,bytes.length,inetaddress,10019); -Datagramsocket.send (Datagrampacket); -                 if(Nextline.equals ("886")) { in                      Break; -} to}

32

33}Catch(SocketException e) { the             //TODO auto-generated catch block *E.printstacktrace (); $}Catch(Unknownhostexception e) {Panax Notoginseng             //TODO auto-generated catch block -E.printstacktrace (); the}Catch(IOException e) { +             //TODO auto-generated catch block AE.printstacktrace (); the} +} -}

45

Send Code

Third, using thread receivethread to realize the receiving of information

1  PackageCom.fhcq.chat;2 3 ImportJava.io.IOException;4 ImportJava.net.DatagramPacket;5 ImportJava.net.DatagramSocket;6 ImportJava.net.SocketException;7 8  Public classReceiveImplementsRunnable {9 Ten@Override One      Public voidRun () { A         //TODO auto-generated method stub -  -         //New Datagramsocket the         Try{ -Datagramsocket Datagramsocket =NewDatagramsocket (10010); -             byte[] buf =New byte[1024]; -             //Blocking method +Datagrampacket Datagrampacket =NewDatagrampacket (BUF, 1024); -              while(true){ +Datagramsocket.receive (Datagrampacket); A                 byte[] data = Datagrampacket.getdata (); at                 intLength = Datagrampacket.getlength (); -String string =NewString (data,0,length); -System.out.println (string); -                 if(String.Equals ("886")) { -                      Break; -} in}

30

*         Catch (SocketException e) { +             //TODO auto-generated catch block               E.printstacktrace ();  the         Catch (IOException e) {              //TODO auto-generated catch block  $             E.printstacktrace (); PNS         } --     }  *

40

Receive Code

"Java Network Programming" UDP-based chat communication