??1 package ?file;
??2
??3 import ?java.awt.Dimension;
??4 import ?java.awt.Toolkit;
??5 import ?java.io.File;
??6 import ?java.util.ArrayList;
??7 import ?java.util.List;
??8
??9 import ?javax.swing.JFrame;
?10 import ?javax.swing.JScrollPane;
?11 import ?javax.swing.JTable;
?12 import ?javax.swing.table.AbstractTableModel;
?13 import ?javax.swing.table.TableModel;
?14 /**?*/ /**
?15 ?*? created by dazuiba
????????? *
????????? *? This programe can dispaly a diractory.
????????? *? when files on this diractory?were modified,inserted or deleted.?
??????????* This programe can?immediately?changes the displayed files list.
????????? *
?16 ?*? @author ?come2u@gmail.com
?17 ?*
?18 ? */
?19 public ? class ?Test? {
?20 ???? public ? static ? void ?main(String[]?args)? {
?21 ????????String?dir? = ? " F:\\ " ;
?22 ????????FileMonitor?m = new ?FileMonitor(dir);
?23 ????????TableModel?tbm = new ?FileTableModel( new ?File(dir));
?24 ????????m.addListener(?(FileListener)?tbm);
?25 ????????m.start( true );
?26 ????????JTable?table? = new ?JTable(tbm);??
?27 ????????JScrollPane?scrollpane? = ? new ?JScrollPane(table);?
?28 ????????
?29 ???????? int ?ww = 500 ;
?30 ???????? int ?hh = 700 ;
?31 ????????scrollpane.setPreferredSize( new ?Dimension(ww,?hh));
?32 ????????JFrame?jf = new ?JFrame(dir);
?33 ????????jf.add(scrollpane);
?34 ????????jf.setSize(ww,hh);
?35 ???????? int ?w? = ?Toolkit.getDefaultToolkit().getScreenSize().width;
?36 ???????? int ?h? = Toolkit.getDefaultToolkit().getScreenSize().height;
?37 ????????System.out.println(w + " :? " + h);
?38 ????????jf.setLocation((w - ww) / 2 ,(h - hh) / 2 );?
?39 ????????jf.setVisible( true );
?40 ???????? // ?Set?to?exit?on?close
?41 ????????jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
?42 ????????
?43 ????}
?44 }
?45
?46 interface ?FileListener? {
?47 ???? void ?dirChanged(FileMonitor?monitor);
?48 }
?49
?50 class ?FileMonitor? implements ?Runnable? {
?51 ????List < FileListener > ?listenerList? = ? new ?ArrayList < FileListener > ();
?52
?53 ???? private ?File?dir;
?54
?55 ???? private ? long ?interval;
?56
?57 ???? private ? long ?lastScanedTime;
?58
?59 ???? private ? int ?oldLength;
?60
?61 ???? public ? void ?addListener(FileListener?listener)? {
?62 ????????listenerList.add(listener);
?63 ????}
?64
?65 ???? public ? void ?start( boolean ?isDamon)? {
?66 ????????Thread?t? = ? new ?Thread( this );
?67 ????????t.setDaemon(isDamon);
?68 ????????t.start();
?69 ????}
?70
?71 ???? public ?FileMonitor(String?_dir)? {
?72 ????????File?f? = ? new ?File(_dir);
?73 ???????? if ?( ! f.isDirectory())
?74 ???????????? throw ? new ?RuntimeException();
?75 ???????? this .dir? = ?f;
?76 ???????? this .interval? = ? 1000 ; // ?1?secend
?77 ???????? this .oldLength? = ?dir.list().length;
?78 ????}
?79
?80 ???? public ?File[]?getMonitoredFile()? {
?81 ???????? return ? this .dir.listFiles();
?82 ????}
?83
?84 ???? public ? void ?run()? {
?85 ???????? while ?( true )? {?
?86 ???????????? if ?( ! dir.isDirectory())
?87 ???????????????? throw ? new ?RuntimeException();
?88 ???????????? if ?(filesChangeed())? {
?89 ????????????????fireFilesChangeedEvent( this );
?90 ????????????}
?91 ???????????? try ? {
?92 ????????????????Thread.sleep(interval);
?93 ????????????} ? catch ?(InterruptedException?e)? {
?94 ????????????????e.printStackTrace();
?95 ????????????}
?96 ????????}
?97 ????}
?98
?99 ???? private ? void ?fireFilesChangeedEvent(FileMonitor?monitor)? {
100 ???????? for ?( int ?i? = ? 0 ;?i? < ?listenerList.size();?i ++ )? {
101 ????????????listenerList.get(i).dirChanged(monitor);
102 ????????}
103 ????}
104
105 ???? protected ? boolean ?filesChangeed()? {
106 ????????File[]?newFiles? = ?dir.listFiles();
107 ???????? if ?(newFiles.length? != ?oldLength) {
108 ????????????oldLength = newFiles.length;
109 ????????????System.out.println(newFiles.length);
110 ???????????? return ? true ;
111 ????????}
112 ???????? for ?( int ?i? = ? 0 ;?i? < ?newFiles.length;?i ++ )? {
113 ???????????? if ?(newFiles[i].lastModified()? >= ?lastScanedTime)? {
114 ???????????????? return ? true ;
115 ????????????}
116 ????????}
117 ???????? return ? false ;
118 ????}
119 }
120 class ?FileTableModel? extends ?AbstractTableModel? implements ?FileListener {??
121 ??????? private ?File[]?files = null ;
122
123 ???????? public ?FileTableModel(File?dir)? {?
124 ????????????files = dir.listFiles();
125 ????????}
126
127 ???????? public ?FileTableModel(File[]?ff)? {?
128 ???????????? this .files = ff;
129 ????????}
130 ???????? public ? int ?getRowCount()? {
131 ???????????? return ?files.length;
132 ????????}
133
134 ???????? // ?Get?a?column's?name.
135 ???????? public ?String?getColumnName( int ?col)? {
136 ????????????String?s? = ? " 文件名,大小,修改時間 " ;
137 ???????????? return ?s.split( " , " )[col];
138 ????????} ?
139 ???????? public ? int ?getColumnCount()? {
140 ???????????? return ? 3 ;
141 ????????}
142
143 ???????? public ?Object?getValueAt( int ?rowIndex,? int ?columnIndex)? {?
144 ????????????File?f? = ?files[rowIndex];
145 ???????????? switch ?(columnIndex)? {
146 ???????????? case ? 0 :
147 ???????????????? return ?f.getName();
148 ???????????? case ? 1 :
149 ???????????????? return ?Util.bytes2kb(f.length());
150 ???????????? case ? 2 :
151 ???????????????? return ?Util.toYYYYMMDDHHMMSS(f.lastModified());
152 ????????????}
153 ???????????? return ? "" ;
154 ????????}
155
156 ???????? public ? void ?dirChanged(FileMonitor?monitor)? {
157 ???????????? this .files = monitor.getMonitoredFile();
158 ????????????fireTableDataChanged();
159 ????????}
160 ????????
161 ????}
162

?1 package ?file;
?2
?3 import ?java.math.BigDecimal;
?4 import ?java.math.BigInteger;
?5 import ?java.text.SimpleDateFormat;
?6 import ?java.util.Date;
?7
?8 public ? class ?Util {
?9 ???? public ? static ?String?toYYYYMMDDHHMMSS( long ?time) {
10 ????????SimpleDateFormat?format? = ? new ?SimpleDateFormat( " M月d日H時m分s秒 " );
11 ???????? return ?format.format( new ?Date(time));
12 ????}
13 ???? public ? static ? void ?main(String[]?args)? {
14 ???????? long ?ss? = ? 1 ;
15 ????????System.out.println(Util.bytes2kb(ss));
16 ????}
17 ???? public ? static ?String?bytes2kb( long ?bytes)? {
18 ???????????BigDecimal?filesize? = ? new ?BigDecimal(bytes);
19 ???????????BigDecimal?megabyte? = ? new ?BigDecimal( 1024 * 1024 );
20 ??????????? float ?returnValue? = ?filesize.divide(megabyte,? 2 ,?BigDecimal.ROUND_UP).floatValue();
21 ??????????? if ?(returnValue? > ? 1 )
22 ??????????????? return (returnValue? + ? " ?MB " );
23 ???????????BigDecimal?kilobyte? = ? new ?BigDecimal( 1024 );
24 ???????????returnValue? = ?filesize.divide(kilobyte,? 2 ,?BigDecimal.ROUND_UP).floatValue();
25 ??????????? return (returnValue? + ? " ?KB " );
26 ????}
27
28 }