I want to add recent opened files to recent menu.I did that task.But,it doesn't store permanently.That means when i close the running application,the recent items also removed.I want to store the recent items permanently,after re run the application the recent open items are available.
My Code:
public class RecentItems extends javax.swing.JFrame {
int i=0;
Queue<String> q;
JMenuItem item;
String recentPath;
int recentItems_count=0;
JTextPane textPane;
JScrollPane scrollPane;
public RecentItems() {
initComponents();
q=new LinkedList<>();
textPane=new JTextPane();
scrollPane=new JScrollPane(textPane);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
openAction = new javax.swing.JMenuItem();
recentItems = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
openAction.setText("OPEN");
openAction.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openActionActionPerformed(evt);
}
});
jMenu1.add(openAction);
recentItems.setText("Recent");
jMenu1.add(recentItems);
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void openActionActionPerformed(java.awt.event.ActionEvent evt) {
FileDialog fd = new FileDialog(RecentItems.this, "Select File", FileDialog.LOAD);
fd.setVisible(true);
String title;
String sts;
File file;
if (fd.getFile() != null) {
sts = fd.getDirectory() + fd.getFile();
file=new File(sts);
title=fd.getFile();
JInternalFrame internalFrame = new JInternalFrame("",true,true);
i++;
internalFrame.setName("Doc "+i);
internalFrame.setTitle(title);
try {
internalFrame.setSelected(true);
}
catch (PropertyVetoException ex) {
Logger.getLogger(RecentItems.class.getName()).log(Level.SEVERE, null, ex);
}
internalFrame.add(scrollPane);
tp.add(internalFrame);
try{
tp.setSelectedIndex(i-1);
}
catch(IndexOutOfBoundsException ioe){
}
try {
textPane.setPage(file.toURI().toURL());
}
catch (MalformedURLException ex) {
Logger.getLogger(RecentItems.class.getName()).log(Level.SEVERE, null, ex);
}
catch (IOException ex) {
Logger.getLogger(RecentItems.class.getName()).log(Level.SEVERE, null, ex);
}
setVisible(true);
textPane.setCaretPosition(0);
q.add(sts);
recentItems_count++;
if(recentItems_count>1) {
int size=q.size();
String[] strArray = new String[q.size()];
q.toArray(strArray);
for(int k=0;k<size;k++) {
for(int i=size-1;i>k;i--) {
if(strArray[k].equals(strArray[i])) {
q.remove(strArray[k]);
tp.remove(internalFrame);
}
}
}
}
if(q.size()<=3) {
recentItems.removeAll();
for( String string : q) {
item=recentItems.add(string);
recentPath=item.getText();
}
}
else if(q.size()>3) {
q.remove();
recentItems.removeAll();
for( String string : q) {
item=recentItems.add(string);
recentPath=item.getText();
}
}
}
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(RecentItems.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(RecentItems.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(RecentItems.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(RecentItems.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new RecentItems().setVisible(true);
}
});
}
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem openAction;
private javax.swing.JMenu recentItems;
private javax.swing.JTabbedPane tp;
}
You should use Java Preferences API to store the user preferences in an easy and cross-platform way.
Define the preferences Object:
Preferences prefs = Preferences.userNodeForPackage(yourpackagename.class);
Set the key name for the reference
final String PREF_NAME = "recent_items";
Put the value in the the preference
prefs.put(PREF_NAME, value);
Retrieve the value associated with the specified key in this preference node
String propertyValue = prefs.get(PREF_NAME, yourDefaultValue);
After adding it to your example:
package com.example;
public class Test extends javax.swing.JFrame implements ActionListener {
int i = 0;
Queue<String> q;
JMenuItem item;
String recentPath;
int recentItems_count = 0;
JTextPane textPane;
JScrollPane scrollPane;
// Retrieve the user's preference node for this package
Preferences prefs = Preferences.userNodeForPackage(com.example.Test.class);
// key name of the preference
final String PREF_NAME = "recent_items";
private List<String> itemsAll = new ArrayList<String>();
public Test() {
initComponents();
q = new LinkedList<>();
textPane = new JTextPane();
scrollPane = new JScrollPane(textPane);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
openAction = new javax.swing.JMenuItem();
recentItems = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
openAction.setText("OPEN");
openAction.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openActionActionPerformed(evt);
}
});
jMenu1.add(openAction);
recentItems.setText("Recent");
jMenu1.add(recentItems);
loaditemsFromPreferences();
for (String item : itemsAll) {
JMenuItem newMenuItem = recentItems.add(item);
newMenuItem.addActionListener(this);
}
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(
getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING).addComponent(tp,
javax.swing.GroupLayout.Alignment.TRAILING,
javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE));
layout.setVerticalGroup(layout.createParallelGroup(
javax.swing.GroupLayout.Alignment.LEADING).addComponent(tp,
javax.swing.GroupLayout.Alignment.TRAILING,
javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE));
pack();
}// </editor-fold>
private JInternalFrame loadFile(String sts, String title) {
File file = new File(sts);
JInternalFrame internalFrame = new JInternalFrame("", true, true);
i++;
internalFrame.setName("Doc " + i);
internalFrame.setTitle(title);
try {
internalFrame.setSelected(true);
} catch (PropertyVetoException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
internalFrame.add(scrollPane);
tp.add(internalFrame);
try {
tp.setSelectedIndex(i - 1);
} catch (IndexOutOfBoundsException ioe) {
}
try {
textPane.setPage(file.toURI().toURL());
} catch (MalformedURLException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
setVisible(true);
textPane.setCaretPosition(0);
q.add(sts);
return internalFrame;
}
private void openActionActionPerformed(java.awt.event.ActionEvent evt) {
FileDialog fd = new FileDialog(Test.this, "Select File",
FileDialog.LOAD);
fd.setVisible(true);
if (fd.getFile() != null) {
String sts = fd.getDirectory() + fd.getFile();
String title = fd.getFile();
JInternalFrame internalFrame = loadFile(sts, title);
recentItems_count++;
if (recentItems_count > 1) {
int size = q.size();
String[] strArray = new String[q.size()];
q.toArray(strArray);
for (int k = 0; k < size; k++) {
for (int i = size - 1; i > k; i--) {
if (strArray[k].equals(strArray[i])) {
q.remove(strArray[k]);
tp.remove(internalFrame);
}
}
}
}
if (q.size() <= 3) {
recentItems.removeAll();
itemsAll.clear();
for (String string : q) {
item = recentItems.add(string);
recentPath = item.getText();
itemsAll.add(recentPath);
storeToPreferences();
}
} else if (q.size() > 3) {
q.remove();
recentItems.removeAll();
itemsAll.clear();
for (String string : q) {
item = recentItems.add(string);
recentPath = item.getText();
itemsAll.add(recentPath);
storeToPreferences();
}
}
}
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager
.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Test.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Test.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Test.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Test.class.getName()).log(
java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Test().setVisible(true);
}
});
}
private void loaditemsFromPreferences() {
for (int i = 0; i < maxItems; i++) {
String value = prefs.get(PREF_NAME + i, "");
if (!value.equals("")) {
itemsAll.add(value);
} else {
break;
}
}
}
private void storeToPreferences() {
for (int i = 0; i < maxItems; i++) {
if (i < itemsAll.size()) {
prefs.put(PREF_NAME + i, (String) itemsAll.get(i));
} else {
prefs.remove(PREF_NAME + i);
}
}
}
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem openAction;
private javax.swing.JMenu recentItems;
private javax.swing.JTabbedPane tp;
private final int maxItems = 3;
public void actionPerformed(ActionEvent e) {
System.out.println("Selected: " + e.getActionCommand());
loadFile(e.getActionCommand(), e.getActionCommand());
}
}
You may want to look into using
PersistenceService, a feature of Java Web Start that "provides methods for storing data locally on the client system, even for applications that are running in the restricted execution environment." Related examples may be found here and here.