Zip Archive of Source code: TextBoxWithFileOps
Type and edit normally in the text box. Load a file if you wish first. Then save off to file. Includes the use of a filechooser and a menu.
In the code below
- Main calls the class FileOpGUI and sets it visible. This must invoke all the following steps
- FileOpGUI assumes the name and initializes all the constituent pieces.
- Code at the bottom declares all the parts and pieces
- Next code after the Class declaration instantiates parts / pieces using the NEW syntax
- Some properties of the bits and pieces are set like titles
- Menu code in automatically entered but the programmer has to fill in what they do. In this case simple file ops like SAVE, OPEN
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* FileOpGUI.java
*
* Created on Jan 13, 2012, 2:08:15 PM
*/
package FileOperations;
import java.io.*;
//import java.util.prefs.Preferences;
/**
*
* @author F. Sandlewould
*/
public class FileOpGUI extends javax.swing.JFrame {
/** Creates new form FileOpGUI */
public FileOpGUI() {
initComponents();
}
/** 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.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
fileChooser = new javax.swing.JFileChooser();
jScrollPane1 = new javax.swing.JScrollPane();
FileContentsTextArea = new javax.swing.JTextArea();
jScrollPane2 = new javax.swing.JScrollPane();
UserPromptTextArea = new javax.swing.JTextArea();
AppendTestButton = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
FileOperations = new javax.swing.JMenu();
mnuOpenFile = new javax.swing.JMenuItem();
mnuSaveFile = new javax.swing.JMenuItem();
mnuNewFile = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("File Operations");
setName("FileFrame"); // NOI18N
FileContentsTextArea.setColumns(20);
FileContentsTextArea.setRows(5);
jScrollPane1.setViewportView(FileContentsTextArea);
UserPromptTextArea.setColumns(20);
UserPromptTextArea.setRows(5);
UserPromptTextArea.setText("User prompt");
jScrollPane2.setViewportView(UserPromptTextArea);
AppendTestButton.setText("Append");
AppendTestButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
AppendTestButtonActionPerformed(evt);
}
});
FileOperations.setText("File");
mnuOpenFile.setText("Open");
mnuOpenFile.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mnuOpenFileActionPerformed(evt);
}
});
FileOperations.add(mnuOpenFile);
mnuSaveFile.setText("Save");
mnuSaveFile.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mnuSaveFileActionPerformed(evt);
}
});
FileOperations.add(mnuSaveFile);
mnuNewFile.setText("New");
mnuNewFile.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mnuNewFileActionPerformed(evt);
}
});
FileOperations.add(mnuNewFile);
jMenuBar1.add(FileOperations);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 673, Short.MAX_VALUE)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 673, Short.MAX_VALUE)
.addComponent(AppendTestButton, javax.swing.GroupLayout.Alignment.LEADING))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 313, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(AppendTestButton)
.addContainerGap(51, Short.MAX_VALUE))
);
pack();
}// </editor-fold>//GEN-END:initComponents
//routine needed to append a line & update file
//append line to the textarea
//use the SaveFile function
private void mnuOpenFileActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnuOpenFileActionPerformed
fileChooser.setDialogTitle("Open SASL List");
fileChooser.setApproveButtonText("Open");
int returnVal = fileChooser.showOpenDialog(this);
if (returnVal == fileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
try {
// What to do with the file, e.g. display it in a TextArea
FileContentsTextArea.read( new FileReader( file.getAbsolutePath() ), null );
UserPromptTextArea.setText( "Opening: " + "\n"+ "\r" + file.getAbsolutePath());
} catch (IOException ex) {
UserPromptTextArea.setText("Problem accessing file"+file.getAbsolutePath());
}
} else {
UserPromptTextArea.setText("File access cancelled by user.");
}
}//GEN-LAST:event_mnuOpenFileActionPerformed
private void mnuSaveFileActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnuSaveFileActionPerformed
Writer output = null;
fileChooser.setDialogTitle("Save SASL List");
fileChooser.setApproveButtonText("Save");
int returnVal = fileChooser.showOpenDialog(this);
if (returnVal == fileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
try{
WriteFile(file.getAbsolutePath(),FileContentsTextArea.getText());
}
catch(NullPointerException ex){}
} else {
UserPromptTextArea.setText("File write cancelled by user.");
}
}//GEN-LAST:event_mnuSaveFileActionPerformed
private void mnuNewFileActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnuNewFileActionPerformed
//open up the file chooser > user navigates to preferred location
//user enters name in file chooser text line
//user clicks enter
Writer output = null;
fileChooser.setDialogTitle("Create new SASL log file");
fileChooser.setApproveButtonText("Save As");
int returnVal = fileChooser.showOpenDialog(this);
if (returnVal == fileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
try{
WriteFile(file.getAbsolutePath(),FileContentsTextArea.getText());
}
catch(NullPointerException ex){}
} else {
UserPromptTextArea.setText("File write cancelled by user.");
}
}//GEN-LAST:event_mnuNewFileActionPerformed
private void AppendTestButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_AppendTestButtonActionPerformed
AppendEntry("another line woot!");
AppendEntry("PathFileName= "); // + fileChooser.getSelectedFile().getAbsolutePath() ); <--this part causes another exception!! ( null pointer )
}//GEN-LAST:event_AppendTestButtonActionPerformed
public void AppendEntry(String Line){
FileContentsTextArea.append( "\n" + Line );
//textarea -> file save
try{
WriteFile(fileChooser.getSelectedFile().getAbsolutePath(),FileContentsTextArea.getText());
}
catch( NullPointerException ex)
{
UserPromptTextArea.setText("Problem writing file > File not saved");
}
};
public void WriteFile(String PathFileName, String FileContents) throws NullPointerException{
Writer output = null;
try {
output = new BufferedWriter(new FileWriter(PathFileName));
output.write(FileContents);
output.close();
FileContentsTextArea.read( new FileReader( PathFileName ), null );
UserPromptTextArea.setText( "File saved: " + "\n"+ "\r" + PathFileName);
}
catch (IOException ex) {
UserPromptTextArea.setText("Problem writing file"+ PathFileName);
throw new NullPointerException("Cannot write file");
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
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(FileOpGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(FileOpGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(FileOpGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(FileOpGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new FileOpGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton AppendTestButton;
private javax.swing.JTextArea FileContentsTextArea;
private javax.swing.JMenu FileOperations;
private javax.swing.JTextArea UserPromptTextArea;
private javax.swing.JFileChooser fileChooser;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JMenuItem mnuNewFile;
private javax.swing.JMenuItem mnuOpenFile;
private javax.swing.JMenuItem mnuSaveFile;
// End of variables declaration//GEN-END:variables
}
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