Java Learning Notes _ Network + multithreading

Supports both client and server side of simultaneous transceiver

Client

1 Importjavax.swing.*;2 Importjava.awt.*;3 ImportJava.io.*;4 Importjava.net.*;5 Importjava.awt.event.*;6 7  Public classChatClient {8     PrivateJTextArea incoming;9     PrivateJTextField outgoing;Ten     Privateprintwriter writer; One     PrivateBufferedReader Reader; A          -      Public Static voidMain (string[] args) { -ChatClient client =Newchatclient (); the client.go (); -     } -      -     Private voidGo () { + Build_gui (); - setup_net (); +     } A      at     Private voidBuild_gui () { -JFrame frame =NewJFrame ("Chat Client")); -JPanel Panel =NewJPanel (); -          -incoming =NewJTextArea (15, 50); -Incoming.setlinewrap (true); inIncoming.setwrapstyleword (true); -Incoming.seteditable (false); toJScrollPane Qscroller =NewJScrollPane (incoming); + Qscroller.setverticalscrollbarpolicy (scrollpaneconstants.vertical_scrollbar_always); - Qscroller.sethorizontalscrollbarpolicy (scrollpaneconstants.horizontal_scrollbar_never); the Panel.add (incoming); *          $Outgoing =NewJTextField (20);Panax Notoginseng Panel.add (outgoing); -          theJButton button =NewJButton ("Send"); +Button.addactionlistener (NewSendbuttonlistener ()); A panel.add (button); the          + frame.add (Borderlayout.center, panel); - frame.setdefaultcloseoperation (jframe.exit_on_close); $Frame.setsize (600, 400);  $Frame.setvisible (true); -     } -      the      Public classSendbuttonlistenerImplementsActionListener { -          Public voidactionperformed (ActionEvent a) {WuyiString msg =Outgoing.gettext (); the             Try { - writer.println (msg); Wu Writer.flush (); -}Catch(Exception ex) {ex.printstacktrace ();} AboutOutgoing.settext (""); $ Outgoing.requestfocus (); -         } -     } -      A     classReceivethreadjobImplementsRunnable { +          Public voidrun () { the String msg; -             Try { $                  while(msg = Reader.readline ())! =NULL ) { theIncoming.append (msg + "\ n")); the                 } the}Catch(IOException ex) {System.out.println ("server Disconnected"); }         the         } -     } in      the     Private voidsetup_net () { the         Try { AboutSocket s =NewSocket ("127.0.0.1", 4242); thewriter =NewPrintWriter (S.getoutputstream ()); theInputStreamReader StreamReader =NewInputStreamReader (S.getinputstream ()); theReader =NewBufferedReader (StreamReader);  +  -Runnable Receive_thread_job =Newreceivethreadjob (); theThread Receive_thread =NewThread (receive_thread_job);Bayi Receive_thread.start (); the              the}Catch(IOException ex) { - ex.printstacktrace (); -         } the     } the}

Server-side

1 ImportJava.io.*;2 Importjava.net.*;3 Importjava.util.ArrayList;4 5  Public classChatserver {6 BufferedReader Reader;7Arraylist<printwriter> Writer_array =NewArraylist<printwriter>();8 9      Public Static voidMain (string[] args) {TenChatserver Server =Newchatserver (); One server.go (); A     } -      -     Private voidGo () { the setup_net (); -     } -      -     Private voidsetup_net () { +         Try { -ServerSocket Serversock =NewServerSocket (4242); +              while(true) { ASocket s =serversock.accept (); atSYSTEM.OUT.PRINTLN ("Client Connected"); -InputStreamReader StreamReader =NewInputStreamReader (S.getinputstream ()); -Reader =NewBufferedReader (StreamReader);  -PrintWriter writer =NewPrintWriter (S.getoutputstream ()); - Writer_array.add (writer);  -Runnable Server_proc_thread_job =Newserverprocthreadjob (); inThread Server_proc =NewThread (server_proc_thread_job); - Server_proc.start (); to             } +}Catch(IOException ex) { - ex.printstacktrace (); the         } *     } $     Panax Notoginseng     classServerprocthreadjobImplementsRunnable { -          Public voidrun () { the String msg; +             Try { A                  while(msg = Reader.readline ())! =NULL ) { the System.out.println (msg); +                      for(PrintWriter writer:writer_array) { - writer.println (msg); $ Writer.flush (); $                     } -                 } -}Catch(IOException ex) {System.out.println ("Client Disconnected"); } the         } -     }Wuyi}

Java Learning Notes _ Network + multithreading