JAVA programming (17) ----- prepare file copy software process input stream output stream NIO progress bar bottom copy Multithreading

JAVA programming (17) ----- prepare file copy software process input stream output stream NIO progress bar bottom copy Multithreading

Using NIO to copy files at the underlying layer (byte) multi-threading technology elementary applications run programs without blocking

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. JTextFi Eld;/*** 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 JTextField inField = null, outField = null;/*** constructor */public NIOTest () {this. setSize (400,300); this. setResizable (false); this. Setdefaclocloseoperation (EXIT_ON_CLOSE); this. setLocationRelativeTo (null); this. setLayout (null);/*** JProgressBar setting */jbar = new JProgressBar (); jbar. setMinimum (0); jbar. setMaximum (100); // display the upper and lower limit jbar. setValue (0); // The Initial Value jbar. setStringPainted (true); // display the percentage of jbar. setBounds (50,150,300, 30);/*** text input box */inField = new JTextField (); inField. setBounds (50, 50,300, 30); outField = new JTextField (); outField. setBoun Ds (50,100,300, 30);/*** copy start button */startButton = new JButton ("START copy"); startButton. setBounds (150,200,100, 30);/*** Add the listener button, and the anonymous internal class is instantiated locally */startButton. addActionListener (new ActionListener () {@ Overridepublic void actionreceivmed (ActionEvent e) {startButton. setEnabled (false);/*** multithreading technology creates a Thread to instantiate the Runnable interface */new Thread (new Runnable () {@ Overridepublic void run () {// create an input/output stream. Filexxxxxx is used here because they are using NIO. 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 vehicle ByteBuffer buffer = ByteBuffer. allocate (4096); while (eachSize = fcin. read (buffer ))! =-1) {// the pointer returns to zero and starts to read data until the end of the content buffer. flip (); fout. write (buffer); // clear the car buffer. clear (); // set copyedSize + = eachSize; jbar. setValue (int) (100.0 * copyedSize/totleSize) ;}} catch (FileNotFoundException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();} finally {// close the input and output streams 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 to use this to start running the new thread}); this. add (inField); this. add (outField); this. add (startButton); this. add (jbar);}/*** the main method setting window is visible * @ param args */public static void main (String [] args) {new NIOTest (). setVisible (true );}}