Java programming ()-----Making file copy software process input stream output stream NIO progress bar Bottom Copy multithreading

Use NIO to make underlying copies of files (in bytes) multithreading technology primary applications do not block programs from running

Package Com.lovo.homework01;import Java.awt.event.actionevent;import Java.awt.event.actionlistener;import Java.io.fileinputstream;import Java.io.filenotfoundexception;import Java.io.fileoutputstream;import Java.io.ioexception;import Java.nio.bytebuffer;import Java.nio.channels.filechannel;import Javax.swing.JButton; Import Javax.swing.jframe;import javax.swing.jprogressbar;import javax.swing.jtextfield;/** * Class: File copy * @author Abe * NIO application, JProgressBar application */@SuppressWarnings ("Serial") public class Niotest extends JFrame {private JProgressBar jbar = null; private int totlesize = 0;private int copyedsize = 0;private int eachsize = 0;private JButton Startbutton = null;private J TextField infield = null, outfield = null;/** * Constructor */public niotest () {this.setsize (+); this.setresizable (false); th Is.setdefaultcloseoperation (Exit_on_close); This.setlocationrelativeto (null); This.setlayout (null);/** * JProgressBar Settings */jbar = new JProgressBar () jbar.setminimum (0); jbar.setmaximum (100);//display upper and lower bounds Jbar.setvAlue (0);//Initial value jbar.setstringpainted (TRUE);//Display percent jbar.setbounds (50, 150, 300, 30);/** * text input box */infield = new JTextField (); Infield.setbounds ((); outfield = new JTextField (); Outfield.setbounds (50, 100, 300, 30);/** * Copy Start button */star TButton = new JButton ("Start copy"); Startbutton.setbounds (150, 200, 100, 30);/** * button plus listener, anonymous inner class in-place instantiation */ Startbutton.addactionlistener (new ActionListener () {@Overridepublic void actionperformed (ActionEvent e) { Startbutton.setenabled (FALSE);/** * Multithreading technology Create a new thread-in-place instantiation Runnable Interface */new thread (new Runnable () {@Overridepublic void run () {//New input/output stream here filexxxxxx is because of the NIO method that they can use fileinputstream in = null; FileOutputStream out = null;try {in = new FileInputStream (Infield.gettext ()), out = new FileOutputStream (outfield.gettext ());//nio exclusive transmission channel FileChannel fcin = In.getchannel (); FileChannel fout = Out.getchannel (); totlesize = In.available ();//nio Exclusive Transport trolley Bytebuffer buffer = bytebuffer.allocate (4096 ); while ((Eachsize = fcin.read (buffer))! =-1) {//pointer back to 0 and start reading data until the end of the content Buffer.flIP (); fout.write (buffer);//Empty Trolley buffer.clear ();//Set progress bar display content Copyedsize + = Eachsize;jbar.setvalue ((int) (100.0 * copyedsize/totlesize));}} catch (FileNotFoundException e) {e.printstacktrace ();} catch (IOException e) {e.printstacktrace ();} finally {// Close input and output stream if (in! = null) {try {in.close ()} catch (IOException e) {e.printstacktrace ()}} if (out! = null) {try {out.close ();} catch (IOException e) {e.printstacktrace ();}}}}). Start ();//Do not forget the new thread started running with this}); This.add (infield); This.add (outfield); This.add (Startbutton); This.add (Jbar);} /** * Main Method Set window visible * @param args */public static void main (string[] args) {new Niotest (). setvisible (True);}}

Java programming ()-----Making file copy software process input stream output stream NIO progress bar Bottom Copy multithreading