Image Retrieval Program

/*
@ The purpose of this program is to filter files through the file filter.
@ Author: Li hongliang
*/

Import java. awt. event .*;
Import java. io .*;
Import javax. swing .*;
Import java. util .*;
Import javax. swing. event .*;
Import java. awt .*;
Import javax. swing. filechooser. FileFilter;

Public class CheckImageDemo extends JFrame {
Private JMenu menu, helpmenu;
Private JMenuItem openFile, exititem, helpitem;
Private JLabel label, label1;
Private JScrollPane jscrollPane;
Private JMenuBar menuBar;
Private JFileChooser fileChooser;

Public CheckImageDemo (){
Super ("retrieving images ");
This. addWindowListener (new WindowAdapter (){
Public void windowClosing (WindowEvent ev ){
System. exit (0 );
}
});
MenuBar = new JMenuBar ();
Menu = new JMenu ("file ");
OpenFile = new JMenuItem ("open ");
Exititem = new JMenuItem ("quit ");
SetJMenuBar (menuBar );
MenuBar. add (menu );
Menu. add (openFile );
Menu. add (exititem );
/*************************************** ****************************************
File "exit" listening event
**************************************** ***************************************/
Exititem. addActionListener (new ActionListener (){
Public void actionreceivmed (ActionEvent e ){
System. exit (0 );
}
});
Helpmenu = new JMenu ("about ");
Helpitem = new JMenuItem ("about image retrieval ");
Helpmenu. add (helpitem );
MenuBar. add (helpmenu );
/*************************************** ****************************************
"About" monitoring events
**************************************** ***************************************/
Helpitem. addActionListener (new ActionListener (){
Public void actionreceivmed (ActionEvent e ){
String str = "welcome to use this program! "+"/N "+
"The copyright of the program is owned by the author." + "/n" +
"Author: Li hongliang Update: 2008-04-03" + "/n" +
"For more information, visit: http://lhl54861287.qyun.net ";
JOptionPane. showMessageDialog (null, str, "about retrieving images", JOptionPane. INFORMATION_MESSAGE );
}
});
Label = new JLabel ("", SwingConstants. CENTER );
Label1 = new JLabel ("", SwingConstants. CENTER );
Label1.setText ("Image Retrieval Center ");
Label. setIcon (new ImageIcon ("1.gif "));
JscrollPane = new JScrollPane ();
JscrollPane. getViewport (). add (label );
GetContentPane (). setLayout (new BorderLayout ());
GetContentPane (). add (jscrollPane, BorderLayout. CENTER );
GetContentPane (). add (label1, BorderLayout. SOUTH );
FileChooser = new JFileChooser ();
JFileFilter filter = new JFileFilter ();
Filter. addType ("jpg ");
Filter. addType ("gif ");
Filter. setDescription ("IMG archives ");
FileChooser. addChoosableFileFilter (filter );
/*************************************** ****************************************
Listener for file "open"
**************************************** ***************************************/
OpenFile. addActionListener (new ActionListener (){
Public void actionreceivmed (ActionEvent e ){
Int r = fileChooser. showOpenDialog (null );
If (r = JFileChooser. APPROVE_OPTION ){
String pathname = fileChooser. getSelectedFile (). getPath ();
Label1.setText ("The path of the image you open is:" + pathname );
Label. setIcon (new ImageIcon (pathname ));
}
}
});
}

Class JFileFilter extends FileFilter {
Protected String description;
Protected ArrayList arraylist = new ArrayList ();

Public void addType (String s ){
Arraylist. add (s );
}

Public void setDescription (String s ){
Description = s;
}

Public String getDescription (){
Return description;
}

Public boolean accept (File f ){
If (f. isDirectory ()){
Return true;
} Else if (f. isFile ()){
Iterator it = arraylist. iterator ();
While (it. hasnext ()){
If (F. getname (). endswith (string) it. Next () return true;
}
}
Return false;
}
}

Public static void main (string ARGs []) {
Checkimagedemo frame = new checkimagedemo ();
Frame. setsize (800,450 );
Dimension screensize = toolkit. getdefatooltoolkit (). getscreensize ();
Dimension framesize = frame. getsize ();
Frame. setlocation (screensize. width-frameSize.width)/2, (screensize. height-frameSize.height)/2 );
Frame. setvisible (true );
}
}