2 svar · 420 visningar · startad av Lime
Tjing slöfockar!
Jag bollade ut ett exempel på ur man kan använda klassen Properties på Passagens Debatt. Ska jag posta den här med?
Och varför är det så lite aktivitet i Java-konfan? Jag har ju ingenting att göra!!! Mera frågor, NU!!!
/Lime
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Praeterea conseo microsoftenem esse delendam.
- modernt latinskt ordspråk
Ja, gör det!
Sitter och försöker skriva ett pop3 program i java. Det kommer säkert att komma frågor :)
Hittade en bra pop3-klass så det är inga problem, men att få ihop skiten med ett vettigt gränssnitt, lite loggar och tjoffa runt det i en databas kommer nog att generera en och annan fråg!
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The computer is mightier than the pen, the sword, and usually, the programmer.
Okej... Låååångt blir det...
PropertyHandler.java
/*
* PropertyHandler.java
*
* Created on den 9 januari 2002, 10:40
*/
package lime.util;
/**
* This is a code used mainly for internal educational use.
* Feel free to use it as you wich but please state the origin
* of the code.
* <p>
* The author will not answer any questions about the code by mail.
* Questions can be asked at <a href="http://program.webforum.nu/"> WebForum</a>
*
* @author lime@enea.se
*/
public class PropertyHandler {
/** Creates a new instance of PropertyHandler */
public PropertyHandler() {
}
/**
* @param args the command line arguments
*/
public static void main (String args[]) {
new PropertyHandlerFrame();
}
}
PropertyHandlerFrame.java
/*
* PropertyHandlerFrame.java
*
* Created on den 9 januari 2002, 09:59
*/
package lime.util;
import javax.swing.*;
import java.io.*;
import javax.swing.filechooser.*;
import java.util.*;
import lime.util.tools.*;
/**
* This is a code used mainly for internal educational use.
* Feel free to use it as you wich but please state the origin
* of the code.
* <p>
* The author will not answer any questions about the code by mail.
* Questions can be asked at <a href="http://program.webforum.nu/"> WebForum</a>
* <p>
* All code is written in NetBeans IDE 3.3, downloadable for free at [url="http://www.netbeans.org."]www.netbeans.org.[/url]
* <p>
* This class it the GUI-class for the example of the Property class.
* <p>
* @author lime@enea.se
*/
public class PropertyHandlerFrame extends javax.swing.JFrame {
/** Creates new form PropertyHandler */
public PropertyHandlerFrame() {
initComponents();
this.show();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
keyList = new javax.swing.JList();
valueList = new javax.swing.JList();
menuBar = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
openMenuItem = new javax.swing.JMenuItem();
saveMenuItem = new javax.swing.JMenuItem();
exitMenuItem = new javax.swing.JMenuItem();
editMenu = new javax.swing.JMenu();
cutMenuItem = new javax.swing.JMenuItem();
copyMenuItem = new javax.swing.JMenuItem();
pasteMenuItem = new javax.swing.JMenuItem();
deleteMenuItem = new javax.swing.JMenuItem();
addMenuItem = new javax.swing.JMenuItem();
editMenuItem = new javax.swing.JMenuItem();
helpMenu = new javax.swing.JMenu();
contentsMenuItem = new javax.swing.JMenuItem();
aboutMenuItem = new javax.swing.JMenuItem();
setForeground(java.awt.Color.black);
setBackground(new java.awt.Color(204, 255, 255));
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
}
});
jPanel1.setBackground(new java.awt.Color(255, 255, 255));
jPanel1.setPreferredSize(new java.awt.Dimension(300, 200));
jPanel1.setMinimumSize(new java.awt.Dimension(200, 200));
keyList.setBorder(new javax.swing.border.TitledBorder("Key"));
keyList.setMinimumSize(new java.awt.Dimension(100, 100));
jPanel1.add(keyList);
valueList.setBorder(new javax.swing.border.TitledBorder("Value"));
valueList.setMinimumSize(new java.awt.Dimension(100, 100));
valueList.setEnabled(false);
jPanel1.add(valueList);
getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);
fileMenu.setText("File");
openMenuItem.setText("Open");
openMenuItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openMenuItemActionPerformed(evt);
}
});
fileMenu.add(openMenuItem);
saveMenuItem.setText("Save");
saveMenuItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
saveMenuItemActionPerformed(evt);
}
});
fileMenu.add(saveMenuItem);
exitMenuItem.setText("Exit");
exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
exitMenuItemActionPerformed(evt);
}
});
fileMenu.add(exitMenuItem);
menuBar.add(fileMenu);
editMenu.setText("Edit");
cutMenuItem.setText("Cut");
editMenu.add(cutMenuItem);
copyMenuItem.setText("Copy");
editMenu.add(copyMenuItem);
pasteMenuItem.setText("Paste");
editMenu.add(pasteMenuItem);
deleteMenuItem.setText("Delete Property");
deleteMenuItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
deleteMenuItemActionPerformed(evt);
}
});
editMenu.add(deleteMenuItem);
addMenuItem.setText("Add Property");
addMenuItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addMenuItemActionPerformed(evt);
}
});
editMenu.add(addMenuItem);
editMenuItem.setText("Edit Property");
editMenu.add(editMenuItem);
menuBar.add(editMenu);
helpMenu.setText("Help");
contentsMenuItem.setText("Contents");
helpMenu.add(contentsMenuItem);
aboutMenuItem.setText("About");
helpMenu.add(aboutMenuItem);
menuBar.add(helpMenu);
setJMenuBar(menuBar);
pack();
}
/**
* This is the method that opens the .lprop file and restores the properties.
* @param evt The ActionEvent from the Menu.
**/
private void openMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
JFileChooser filechooser = new JFileChooser();
ExtensionFileFilter filter = new ExtensionFileFilter();
filter.addExtension("lprop");
filter.setDescription("Lime Property files");
filechooser.addChoosableFileFilter(filter);
int selected = filechooser.showOpenDialog(null);
switch(selected) {
case JFileChooser.APPROVE_OPTION:
File selectedFile = filechooser.getSelectedFile();
File directory = filechooser.getCurrentDirectory();
try{
props.load(new FileInputStream(selectedFile));
}
catch (java.io.IOException ioe) { ioe.printStackTrace(); System.exit(-1);}
Enumeration keys = props.keys();
keyVector.clear();
valueVector.clear();
while(keys.hasMoreElements()) {
String keyTemp = (String) keys.nextElement();
String valTemp = props.getProperty(keyTemp);
keyVector.add(keyTemp);
valueVector.add(valTemp);
}
updateLists();
case JFileChooser.CANCEL_OPTION:
break;
default:
break;
}
}
/**
* This is the method that saves the parameters to the .lprop file.
* @param evt The ActionEvent from the Menu.
**/
private void saveMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
JFileChooser filechooser = new JFileChooser();
ExtensionFileFilter filter = new ExtensionFileFilter();
filter.addExtension("lprop");
filter.setDescription("Lime Property files");
filechooser.addChoosableFileFilter(filter);
int selected = filechooser.showSaveDialog(null);
switch (selected) {
case JFileChooser.APPROVE_OPTION:
File selectedFile = filechooser.getSelectedFile();
File directory = filechooser.getCurrentDirectory();
if (selectedFile != null) {
// Save the props
try {
props.store( new FileOutputStream(selectedFile), "Lime props");
}
catch (java.io.IOException ioe) { ioe.printStackTrace(); System.exit(-1);}
} // if
break;
case JFileChooser.CANCEL_OPTION:
break;
default:
break;
} // switch
}
private void deleteMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
String selectedKey = (String) keyList.getSelectedValue();
if (selectedKey != null) {
String valueFromProps = props.getProperty(selectedKey);
String[] message = new String[3];
message[0] = "Are you sure that you want to delete";
message[1] = "the key \""+ selectedKey + "\"";
message[2] = "with value \"" + valueFromProps + "\"?";
int result = JOptionPane.showConfirmDialog(this,message,"Confirm Delete",JOptionPane.OK_CANCEL_OPTION );
if (result == JOptionPane.YES_OPTION) {
props.remove(selectedKey);
valueVector.remove(valueFromProps);
keyVector.remove(selectedKey);
updateLists();
}
}
}
private void addMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
// Add your handling code here:
String key = null;
String value = null;
key = JOptionPane.showInputDialog(this,"Enter the property key:","Property input: Key 1(2)", JOptionPane.OK_CANCEL_OPTION);
if(key != null){
value = JOptionPane.showInputDialog(this,"Enter the property value:","Property input: Value 2(2)", JOptionPane.OK_CANCEL_OPTION);
}
if ((value != null) && (key != null) && (value != "") && (key != "")){
props.setProperty(key,value);
keyVector.add(key);
valueVector.add(value);
updateLists();
}
}
private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
}
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
}
private void updateLists() {
keyList.setListData(keyVector);
valueList.setListData(valueVector);
}
// Variables declaration - do not modify
private javax.swing.JList valueList;
private javax.swing.JMenuItem cutMenuItem;
private javax.swing.JMenuItem addMenuItem;
private javax.swing.JMenuItem pasteMenuItem;
private javax.swing.JMenuItem aboutMenuItem;
private javax.swing.JMenuItem deleteMenuItem;
private javax.swing.JMenuItem saveMenuItem;
private javax.swing.JMenu helpMenu;
private javax.swing.JMenuItem editMenuItem;
private javax.swing.JMenuBar menuBar;
private javax.swing.JMenuItem contentsMenuItem;
private javax.swing.JMenu editMenu;
private javax.swing.JMenuItem exitMenuItem;
private javax.swing.JMenuItem copyMenuItem;
private javax.swing.JPanel jPanel1;
private javax.swing.JMenu fileMenu;
private javax.swing.JList keyList;
private javax.swing.JMenuItem openMenuItem;
// End of variables declaration
private static java.util.Properties props = new java.util.Properties();
private Vector keyVector = new Vector(50);
private Vector valueVector = new Vector(50);
}
ExtensionFileFilter.java
/*
* ExtensionFileFilter.java
*
* Created on den 9 januari 2002, 14:11
*/
package lime.util.tools;
/**
* A file filter that matches file name extensions.
* These is to be a filter like this in the standard JFC
* classes, making this obsolete.
*
* @author ovli
*/
public class ExtensionFileFilter extends javax.swing.filechooser.FileFilter {
/**
* The description for this file filter.
*/
private String description;
/**
* The extensions that match this filter.
*/
private java.util.Hashtable filters = null;
/** Creates a new instance of ExtensionFileFilter */
public ExtensionFileFilter() {
filters = new java.util.Hashtable();
setDescription("undefined");
}
/**
* Add the given extension to the list of extensions
* to match. The extensions should not have a '.' in it.
* <p>
* @param extension The extension to add to the list of matching extensions.
**/
public void addExtension(String extension) {
filters.put(extension.toLowerCase(), this);
}
/**
* @return The description of this file filter.
**/
public String getDescription() {
return description;
}
/**
* Set the description of this file filter. This
* will be displayed in the file chooser's filter
* selection box.
* <p>
* @param d The file filter's description.
**/
public void setDescription(String d) {
description = d;
}
/**
* The file maches if its extension is contained in our filter hashtable.
* <p>
* @param f The File to test for matching the filter criteria.
* @return True if given File matches the filter criteria.
* False otherwise.
**/
public boolean accept(java.io.File f) {
if (f != null) {
if (f.isDirectory() ) {
return true;
}
String extension = getExtension(f);
if (extension != null && filters.get (extension) != null){
return true;
}
}
return false;
}
/**
* Determine the extension of the given File.
* <p>
* @param f The File whose extension is desired.
* @return The extension of the given File, in lower case.
**/
private String getExtension(java.io.File f) {
if (f != null) {
String filename = f.getName();
int i = filename.lastIndexOf('.');
if (i>0 && i<filename.length() -1 ) {
return filename.substring(i+1).toLowerCase();
};
}
return null;
}
}
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Praeterea conseo microsoftenem esse delendam.
- modernt latinskt ordspråk