Java I/O FileReader dan FileWriter

Membuat program membaca dan menulis file text menggunakan java IO:


Rancangan GUI Program

• Ubah nama variabel JTextArea menjadi textArea
• Ubah nama variabel button untuk Tampilkan Text menjadi btnTampil
• Ubah nama variabel button untuk Simpan Text menjadi btnSimpan

Deklarasi package

package TempatText;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;

Deklarasi Variable global

File contohFile = new File("storageText.txt");
String text = null;

Isi method btnTampil

private void btnTampilActionPerformed(java.awt.event.ActionEvent evt) {     

if(btnTampil.getText().equals("Tampilkan Text")) {
            try {
                FileReader fileReader = new FileReader(contohFile);
                BufferedReader bufferedReader = new BufferedReader(fileReader);
                while ( ( text = bufferedReader.readLine() ) != null )
                    textArea.append ( text + "\n" ) ;
                    bufferedReader.close();
            }
            catch(IOException ex) {
                ex.printStackTrace();
            }
           btnTampil.setText("Hapus Text");
        }
        else {
            textArea.setText("");
            btnTampil.setText("Tampilkan Text");
        }

}

Isi method btnSimpan

private void btnSimpanActionPerformed(java.awt.event.ActionEvent evt) {                                          
        try {
            String text= textArea.getText();
            FileWriter fileWriter = new FileWriter(contohFile);
            BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
            bufferedWriter.write(text, 0, text.length());
            bufferedWriter.newLine();
            bufferedWriter.close();
        }
        catch(IOException ex){
            ex.printStackTrace();
        }
        textArea.setText("");
        btnTampil.setText("Tampilkan Text");
    }