MEMBUAT DAN MEMBACA DARI JAVA
Dari java, kita bisa membuat file dan sekaligus membaca
file. Caranya adalah jalankan aplikasi Netbeans ( kebetulan editor java yang
saya pakai adalah Netbeans ).
1. Selanjutnya buat
project baru dengan cara File - new Project
2. Pada dialog project
pilih ‘java’ pada pada categories dan pilih ‘java application’ pada project.
3. Yang isi perlu anda
isikan adalah :
Project Name :
File
Project Location : c:\Lat_java
Selanjutnya klik ‘Finish’
4. Pada project yang
terbentuk, buat form baru di package ‘file’ dengan cara klik kanan pada package
file - new - JFrame Form …
5. Ganti Properties title
JFrame dengan ‘Read and Write File’
6. Tambahkan 3 JButton
dan 1 JText Area dari Palette kedalam JFrame dan buat text JButton Menjadi
seperti berikut :
7. Setelah JFrame
berbentuk seperti diatas, tiba saatnya kita mengisi source code program.
Tambahkan perintah berikut di atas nama class
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
Dan dibawah nama class
private JFileChooser dialog = new JFileChooser();
8. Isikan source code
pada tombol ‘Create File’ dengan cara klik kanan pada JButton ‘Create
File’ - Event - Action - ActionPerformed.
Isikan Source code seperti berikut :
int returnVal =
dialog.showSaveDialog(this);
if (returnVal ==
JFileChooser.APPROVE_OPTION) {
File file =
dialog.getSelectedFile();
try {
file.createNewFile();
PrintWriter out = new PrintWriter(new BufferedWriter(new
FileWriter(file)));
out.print(jTextArea1.getText());
out.flush();
} catch
(IOException ex) {
System.err.println("Error: " + ex.getMessage());
}
} else {
JOptionPane.showMessageDialog(null, "Batal Create File ..");
}
9. Perintah pada JButton
‘Read File’
jTextArea1.setText(null);
int returnVal =
dialog.showOpenDialog(this);
if (returnVal ==
JFileChooser.APPROVE_OPTION) {
File file =
dialog.getSelectedFile();
try{
FileInputStream fstream = new FileInputStream(file);
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new
InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null){
StringTokenizer st = new StringTokenizer(strLine, ",");
jTextArea1.setText(jTextArea1.getText() + st.nextToken() +"\n");
}
in.close();
}catch
(Exception e){
System.err.println("Error: " + e.getMessage());
}
} else {
JOptionPane.showMessageDialog(null, "Batal Buka File ..");
}
10. Perintah Pada JButton ‘Close’
System.exit(0);
11. Jalankan Program
12. Klik tombol 'Create File' dan 'Read File'
File Yang dihasilkan dari
Proses diatas adalah seperti berikut :
Source Code Selengkapnya :
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* ReadWrite.java
*
* Created on Oct 13, 2010, 1:07:14 PM
*/
package file;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
/**
*
* @author ichwan
*/
public class ReadWrite extends javax.swing.JFrame {
private JFileChooser dialog = new JFileChooser();
/** Creates new form ReadWrite */
public ReadWrite() {
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() {
jButton1 = new
javax.swing.JButton();
jButton2 = new
javax.swing.JButton();
jButton3 = new
javax.swing.JButton();
jScrollPane1 = new
javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Read and Write
File");
jButton1.setText("Create
File");
jButton1.addActionListener(new
java.awt.event.ActionListener() {
public void
actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Read
File");
jButton2.addActionListener(new
java.awt.event.ActionListener() {
public void
actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText("Close");
jButton3.addActionListener(new
java.awt.event.ActionListener() {
public void
actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
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, 262, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton2)
.addGap(18, 18, 18)
.addComponent(jButton3)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING,
layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 154,
Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2)
.addComponent(jButton3))
.addContainerGap())
);
pack();
}// </editor-fold>
private void
jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
}
private void
jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
jTextArea1.setText(null);
int returnVal =
dialog.showOpenDialog(this);
if (returnVal ==
JFileChooser.APPROVE_OPTION) {
File file =
dialog.getSelectedFile();
try{
FileInputStream fstream = new FileInputStream(file);
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new
InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null){
StringTokenizer st = new StringTokenizer(strLine, ",");
jTextArea1.setText(jTextArea1.getText() + st.nextToken() +"\n");
}
in.close();
}catch
(Exception e){
System.err.println("Error: " + e.getMessage());
}
} else {
JOptionPane.showMessageDialog(null, "Batal Buka File ..");
}
}
private void
jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
int returnVal =
dialog.showSaveDialog(this);
if (returnVal ==
JFileChooser.APPROVE_OPTION) {
File file =
dialog.getSelectedFile();
try {
file.createNewFile();
PrintWriter out = new PrintWriter(new BufferedWriter(new
FileWriter(file)));
out.print(jTextArea1.getText());
out.flush();
} catch
(IOException ex) {
System.err.println("Error: " + ex.getMessage());
}
} else {
JOptionPane.showMessageDialog(null, "Batal Create File ..");
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new
Runnable() {
public void
run() {
new ReadWrite().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
// End of variables declaration
}
Other Sources: http://khalishahazzahra.blogspot.com/2010/10/membuat-dan-membaca-file-dari-java.html
