Sharing & Tutorial

import java.io.BufferedInputStream;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.DataInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import java.io.BufferedWriter;

import java.io.PrintWriter;

import java.io.FileWriter;

import javax.swing.JOptionPane;

import javax.swing.*;

import java.io.*;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.swing.filechooser.FileFilter;

initComponents();

//Saat di awal aplikasi

//Judul = Untitled

this.setTitle("Untitled - NOTES");

//Atur Fillter jenis file dengan Handle fc

fc = new JFileChooser();

fc.addChoosableFileFilter(new jenisFile(EXT));

fc.addChoosableFileFilter(new jenisFile(EXT2));

//Filter Bawaan (All Files) di disable-kan

fc.setAcceptAllFileFilterUsed(false);

//variabel fileBaru diinisialisai dengan TRUE

fileBaru = true;

}

JFileChooser fc;

File file;

boolean fileBaru;

final String[] EXT = { ".csv" };

final String[] EXT2 = { ".txt", ".java" };

public String text,namafiletext;

private void msg(String pesan) {

JOptionPane.showMessageDialog(this,pesan,"Informasi", JOptionPane.INFORMATION_MESSAGE);

}

private boolean okToReplace() {

return (JOptionPane.showConfirmDialog(this, "File "+file.getName()+" Sudah Ada\n"+ "Akan Ditimpa ?",

"Peringatan",JOptionPane.YES_NO_OPTION)==0) ;

}

class jenisFile extends FileFilter {

private String[] s;

jenisFile(String[] sArg) {

s = sArg;

}

// Tentukan file apa yang akan ditampilkan

public boolean accept(File fArg) {

if (fArg.isDirectory())

return true;

// Jika Extension dari file sesuai syarat, tampilkan

for (int i = 0; i < s.length; ++i)

if (fArg.getName().toLowerCase().indexOf(s[i].toLowerCase()) > 0)

return true;

// selain kedua hal di atas, anggap false

return false;

}

public String getDescription() {

String tmp = "";

for (int i = 0; i < s.length; ++i)

tmp += "*" + s[i] + " ";

return tmp;

}

}

private void SimpanFile() {

PrintWriter pw = null;

try {

pw = new PrintWriter(new BufferedWriter(new FileWriter(file)));

} catch (IOException e) {

msg("Gagal Simpan File : '" + file.getName());

return;

}

pw.print(isi1.getText());

pw.close();

this.setTitle(file.getName()+" - NOTES" );

fileBaru = false;

}

class Enskripsimd5 {

private String convertToHex(byte[] data) {

StringBuffer buf = new StringBuffer();

for (int i = 0; i < data.length; i++) {

int halfbyte = (data[i] >>> 4) & 0x0F;

int two_halfs = 0;

do {

if ((0 <= halfbyte) && (halfbyte <= 9)) {

buf.append((char) ('0' + halfbyte));

} else {

buf.append((char) ('a' + (halfbyte - (int) geser.getValue())));

}

halfbyte = data[i] & 0x0F;

} while (two_halfs++ < 1);

}

return buf.toString();

}

public String MD5(String text)

throws NoSuchAlgorithmException, UnsupportedEncodingException {

MessageDigest md;

md = MessageDigest.getInstance("MD5");

byte[] md5hash = new byte[32];

md.update(text.getBytes("iso-8859-1"), 0, text.length());

md5hash = md.digest();

return convertToHex(md5hash);

}

}

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new ta_java().setVisible(true);

}

});

}

private String readFile(File file){

String result="";

try{

FileInputStream fis=new FileInputStream(file);

BufferedInputStream bis=new BufferedInputStream(fis);

DataInputStream dis=new DataInputStream(bis);

while(dis.available()!=0){

result +=dis.readLine()+"\n";

}

}

catch(FileNotFoundException e){

}

catch(IOException e){

}

return result;

}

• Masukkan coding untuk buka file:

• Kemudian coding untuk Simpan File:

• Coding Simpan Sebagai: