Java UDP chat and file transfer

Package Rgy.com.udp3;import Java.awt.font;import Java.awt.gridlayout;import java.awt.event.actionevent;import Java.awt.event.actionlistener;import Java.awt.event.keyadapter;import Java.awt.event.keyevent;import Java.io.File ; Import Java.io.fileinputstream;import Java.io.fileoutputstream;import Java.net.datagrampacket;import Java.net.datagramsocket;import Java.net.inetaddress;import Java.net.socketaddress;import Java.sql.Date;import Java.text.simpledateformat;import Java.util.timer;import Java.util.timertask;import Javax.swing.JButton;import Javax.swing.jfilechooser;import Javax.swing.jframe;import Javax.swing.jlabel;import Javax.swing.JOptionPane; Import Javax.swing.jpanel;import Javax.swing.jscrollpane;import Javax.swing.jtextarea;import  Javax.swing.windowconstants;public class Client extends JFrame {//Join property private JPanel panel = new JPanel ();p rivate JButton Button_send = new JButton ("File send");p rivate JButton button_receive = new JButton ("Save As");p rivate jtextarea ta = new Jtextare A ();p RivaTe JScrollPane sp = new JScrollPane (TA);p rivate jtextarea ta_send = new JTextArea ();p rivate jscrollpane sp_send = new JSCR Ollpane (ta_send);p rivate JLabel label_filestate = new JLabel ("File status", Jlabel.center);p rivate JLabel label_feedback = new J Label ("Feedback", jlabel.center);//private inetaddress IP = null;private int otherport;private int Myport;datagramsocket socket;//receive file to prompt datagramsocket socket1;//receive file information Datagramsocket socket2;//receive the usual chat information//string filename = null;byte buffer[] = new Byte[1024];int FileLen = 0;int Numofblock = 0;int lastsize = 0;//string str_name;//public Client (String str _name, String str_ip, int otherport, int myport) {super (str_name); this.str_name = Str_name; This.setdefaultcloseoperation (Windowconstants.exit_on_close); This.setbounds (600, 250, 300, 400);// Added function code this.setlayout (new GridLayout (5, 1, 7, 7)); Ta.setlinewrap (true);//newline this.add (SP); Ta_send.setlinewrap (true); /newline This.add (sp_send), Button_send.setfont (New Font ("italic", 1)), Button_receive.setfont ("New Font" ("Italic", 1,));p Anel.add (button_send);p anel.add (button_receive); This.add (panel); This.add (label_filestate); This.add ( Label_feedback);//this.setvisible (true);//this.otherport = Otherport;this.myport = Myport;//button_ Send.addactionlistener (new ActionListener () {//Send file public void actionperformed (ActionEvent e) {// Select the file to be sent JFileChooser Filechooser = new JFileChooser (), int result = Filechooser.showopendialog (Client.this), if (result = = jfilechooser.approve_option) {try {File file = Filechooser.getselectedfile (); try {//sends the file name past string str_filename = Fil E.getname (); String Str_tip = "There are files, please handle:" + str_filename;byte[] filenamebuf = str_tip.getbytes ();D atagramsocket socket = new DATAGRAMSOC Ket ();D atagrampacket packet = new Datagrampacket (Filenamebuf, Filenamebuf.length,ip, Client.this.otherport); Socket.send (packet); Socket.close ()//fileinputstream fis = new FileInputStream (file)//Remove write memory from File//Send file length past int FileLen = Fis.available (); String Str_len = "" + filelen;byte[] filelenbuf = Str_len.getbytes ();Socket = new Datagramsocket ();p acket = new Datagrampacket (filelenbuf,filelenbuf.length, ip,client.this.otherport+1); Socket.send (packet); Socket.close ();//Send file body byte[] buf = new Byte[1024];int Numofblock = filelen/buf.length;//cycle times (This text  Pieces divided by how many blocks) int lastsize = fileLen% buf.length;//Last a little bit of a fraction of the number of bytes socket = new Datagramsocket (); for (int i = 0; i < Numofblock; i++) {fis.read (buf, 0, buf.length);//write memory packet = new Datagrampacket (buf,buf.length, ip,client.this.otherport+1); Socket.send (packet); Thread.Sleep (1); Simple to prevent packet loss}//send the last little bit of a fraction fis.read (buf, 0, lastsize);p acket = new Datagrampacket (buf,buf.length, IP, client.this.otherport+1); socket.send (packet); Thread.Sleep (1); Simple to prevent drop packet phenomenon//fis.close (); Socket.close ();//label_filestate.settext ("File transfer complete!
"); Ta.append (" ");//} catch (Exception ev) {System.out.println (EV);}} catch (Exception ex) {Joptionpane.showmessagedialog (client.this, "Error opening document. ");}}}});/ //////////////button_receive.addactionlistener (new ActionListener () {//Receive file public void actionperformed (ActionEvent e) {//Select the file to receive JFileChooser Filechooser = new JFileChooser (); int result = Filechooser.showsavedialog (client.this); if ( result = = Jfilechooser.approve_option) {try {file File2 = Filechooser.getselectedfile (); try {file file1 = new File ("D:\\tt \ \ "+ filename); SaveAs (File1, file2);//label_filestate.settext (" File receive complete! "); Ta.append (" The file has been processed!!
\ n ");} catch (Exception ex) {System.out.println (ex);}} catch (Exception ex) {Joptionpane.showmessagedialog (Client.this, "Open Save Error!
");}}}});/  /ta_send.addkeylistener (New Keyadapter () {public void keypressed (KeyEvent ke) {String str_chat = Client.this.str_name + " Say: "+ ta_send.gettext (); byte buf[] = Str_chat.getbytes (); if (Ke.iscontroldown () && ke.getkeycode () = = KEYEVENT.V K_enter) {try {datagramsocket socket = new Datagramsocket ();D atagrampacket packet = new Datagrampacket (buf,buf.length, IP , client.this.otherport+2); socket.send (packet); Ta.append ("I said:" +ta_send.gettext () + "\ n"); Ta_send.settext ("");} catch (Exception ex) {System.out.println (ex);}}}); /try {ip = inetaddress.getbyname (STR_IP); socket = new Datagramsocket (this.myport); socket1 = new Datagramsocket ( This.myport + 1); Socket2 = new Datagramsocket (This.myport + 2); Timer timer = new timer ();//timer, flush Receive Message timer.schedule (new mytimertask_receive (), 0, +); while (Socket!=null) {try {// byte filetipbuf[] = new byte[256];//prevents the file name word from being too long (here the maximum 256 characters) Datagrampacket Packet_tip = new Datagrampacket (filetipbuf,0, Filetipbuf.length); socket.receive (Packet_tip); String Str_filetip = new String (Packet_tip.getdata (), 0,packet_tip.getlength ()), filename = str_filetip.substring (8); Ta.append ( Str_filetip + "\ n");//Receive file Length (bytes) byte[] Filelenbuf = new byte[12];//capable of transmitting 1T files Datagrampacket Packet_len = new Datagrampac Ket (filelenbuf,filelenbuf.length); socket1.receive (Packet_len); String str_filelen = new String (Filelenbuf, 0,packet_len.getlength ()); FileLen = Integer.parseint (Str_filelen); Ta.append ("File size:" + fileLen + "bytes," + (filelen/1024) + "KB," + (filelen/1024/1024) + "mb\n");//datagrampacket pack Et_file = new Datagrampacket (buffer, 0,buffer.length), Numofblock = filelen/buffer.length;//cycles (how many blocks are divided into the file) Lastsize = FileLen% buffer.length;//The last tiny fraction of the number of bytes file File = new file ("d:\\tt\\" + filename); FileOutputStream fos = new FileOutputStream (file);//Remove from memory deposit file for (int i = 0; i < Numofblock; i++) {packet_file = new D Atagrampacket (buffer, 0,buffer.length); socket1.receive (packet_file);//Receive Data fos.write via socket (buffer, 0, 1024);//write File} Receive last little bit of a fraction packet_file = NEW datagrampacket (buffer, 0, lastsize); socket1.receive (packet_file);//Receive Data fos.write via socket (buffer, 0, lastsize);// Write file Fos.close ();//Feedback packet} catch (Exception e) {System.out.println (e);}}} catch (Exception e) {System.out.println (e);}} public void SaveAs (file file1, file file2) {//Save File1 as File2, and delete file1try {FileInputStream fis = new FileInputStream (file1 );  FileOutputStream fos = new FileOutputStream (file2); byte buf[] = new Byte[1024];int len = 0;while (len = Fis.read (BUF))! = -1) {fos.write (buf, 0, Len);} Fis.close (); Fos.close (); File1.delete ();} catch (Exception ex) {System.out.println (ex);}} Class Mytimertask_receive extends TimerTask {public void run () {try{byte chatbuf[] = new byte[512];D atagrampacket packet_c hat = new Datagrampacket (chatbuf, 0,chatbuf.length); socket2.receive (Packet_chat); String str_chat = new String (Packet_chat.getdata (), 0,packet_chat.getlength ()), Ta.append (str_chat + "\ n");} catch (Exception ex) {System.out.println (ex);}}} // ////////////////////////////////////////////////public static void Main (String args[]) {new Client ("Mary", "127.0.0.2", 6000, 10000);}} 

Java UDP chat and file transfer