To see if you can help me, I'm doing a small explorer to list a specific directory, I need to know how to get a button or without a button to update, that is, if I add more files in that directory. Do not have to close and reopen the application, I leave the code.
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package paquete;
import javax.swing.JOptionPane;
import java.io.File;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
/**
*
* @author Usuario
*/
public class Principal extends javax.swing.JFrame {
private DefaultMutableTreeNode root;
public Principal() {
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">
private void initComponents() {
jToolBar1 = new javax.swing.JToolBar();
ArchivoBtn = new javax.swing.JButton();
AyudaBtn = new javax.swing.JButton();
ContactoBtn = new javax.swing.JButton();
jPanel3 = new javax.swing.JPanel();
jScrollPane2 = new javax.swing.JScrollPane();
Explorador = new javax.swing.JTree();
jPanel1 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Explorador");
jToolBar1.setRollover(true);
ArchivoBtn.setText("Archivo");
ArchivoBtn.setFocusable(false);
ArchivoBtn.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
ArchivoBtn.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
jToolBar1.add(ArchivoBtn);
AyudaBtn.setText("Ayuda");
AyudaBtn.setFocusable(false);
AyudaBtn.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
AyudaBtn.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
AyudaBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
AyudaBtnActionPerformed(evt);
}
});
jToolBar1.add(AyudaBtn);
ContactoBtn.setText("Contacto");
ContactoBtn.setFocusable(false);
ContactoBtn.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
ContactoBtn.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
ContactoBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ContactoBtnActionPerformed(evt);
}
});
jToolBar1.add(ContactoBtn);
File fileRoot = new File("C:\Users\Usuario\Desktop\Test");
root = new DefaultMutableTreeNode(new FileNode(fileRoot));
getList(root, new File("C:\Users\Usuario\Desktop\Test"));
Explorador = new JTree(root);
Explorador.setFont(new java.awt.Font("Times New Roman", 0, 12)); // NOI18N
Explorador.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {
public void valueChanged(javax.swing.event.TreeSelectionEvent evt) {
ExploradorValueChanged(evt);
}
});
Explorador.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
ExploradorPropertyChange(evt);
}
});
jScrollPane2.setViewportView(Explorador);
jButton1.setText("Refrescar");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jLabel1.setText("Label Items");
jLabel1.setName("lbl"); // NOI18N
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton1)
.addComponent(jLabel1))
.addContainerGap(284, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(9, 9, 9)
.addComponent(jButton1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 190, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 35, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 281, Short.MAX_VALUE))
.addContainerGap())
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jToolBar1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jToolBar1, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void AyudaBtnActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void ContactoBtnActionPerformed(java.awt.event.ActionEvent evt) {
JOptionPane.showMessageDialog(rootPane, "No necesita ayuda","Ayuda",JOptionPane.INFORMATION_MESSAGE);
}
private void ExploradorValueChanged(javax.swing.event.TreeSelectionEvent evt) {
DefaultMutableTreeNode selectedNode =(DefaultMutableTreeNode)Explorador.getSelectionPath().getLastPathComponent();
jLabel1.setText(selectedNode.getUserObject().toString());
}
private void ExploradorPropertyChange(java.beans.PropertyChangeEvent evt) {
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
File fileRoot = new File("C:\Users\Usuario\Desktop\Test");
root = new DefaultMutableTreeNode(new FileNode(fileRoot));
getList(root, new File("C:\Users\Usuario\Desktop\Test"));
Explorador = new JTree(root);
JOptionPane.showMessageDialog(rootPane, "Actualizando");
rootPane.repaint();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Create and display the form */
java.awt.EventQueue.invokeLater(() -> {
new Principal().setVisible(true);
});
}
// Variables declaration - do not modify
private javax.swing.JButton ArchivoBtn;
private javax.swing.JButton AyudaBtn;
private javax.swing.JButton ContactoBtn;
private javax.swing.JTree Explorador;
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel3;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JToolBar jToolBar1;
// End of variables declaration
public static class FileNode {
private File file;
public FileNode(File file) {
this.file = file;
}
@Override
public String toString() {
String name = file.getName();
if (name.equals("")) {
return file.getAbsolutePath();
} else {
return name;
}
}
}
public void getList(DefaultMutableTreeNode node, File f) {
if(!f.isDirectory()) {
// We keep only JAVA source file for display in this HowTo
System.out.println("Archivo - " + f.getName());
DefaultMutableTreeNode child = new DefaultMutableTreeNode(f.getName());
node.add(child);
}
else {
System.out.println("Directorio - " + f.getName());
DefaultMutableTreeNode child = new DefaultMutableTreeNode(f.getName());
node.add(child);
File fList[] = f.listFiles();
for(int i = 0; i < fList.length; i++)
getList(child, fList[i]);
}
}
}