Source Code Baca & Tulis File untuk Program Kriptografi Java

String doc2String(String fileName) {
BufferedReader be = null;
String data = "";

try {
String current;
int s;
be = new BufferedReader(new FileReader(fileName));
while ((current = be.readLine()) != null) {
data += current;
}
}
catch(Exception ee){}
return data;
}

String doc2String(String fileName) throws IOException{
String gab="";
Path path = Paths.get(fileName);
byte[] data = Files.readAllBytes(path);
for(int i=0; i < data.length; i++) {
char c=(char)(int)data[i];
gab=gab+c;
}
return gab;
}

byte[]doc2Byte(String fileName){
Path path = Paths.get(fileName);
byte[] data = Files.readAllBytes(path); //membaca semua bytes yang ada di object

String[] data1 = new String[data.length];
for(int i=0; i < data.length; i++) {
data1[i] = String.valueOf(data[i] & 0xff); //unsigned integer
}
return data1;
}

byte[] doc2Byte(String al)throws IOException{
Path path = Paths.get(al);
byte[] data = Files.readAllBytes(path);
return data;
}

+++++++++++++++++++++++++++++++++++

void saveByte(byte[] data, String namaFile) throws IOException {
Path path = Paths.get(namaFile);
Files.write(path, dataDecrypt);
}

void saveString(String data,String namaFile) {
try {
String content = data;
File file = new File(namaFile);
if (!file.exists()) {
file.createNewFile();
}

FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(content);
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}

String byte2String(byte[]data){
String gab="";
for(int i=0; i < data.length; i++) {
char c=(char)(int)data[i];
gab=gab+c;
}
return gab;
}

byte[] string2Byte(String data){
char[]ar=data.toCharArray();
byte[]bit=new byte[ar.length];
for(int i=0; i < ar.length; i++) {
int c=(int)ar[i];
bit[i]=(byte)c;
}
return bit;
}

++++++++++++++++++++++++++++++

String getNamaFile(String fileName){
int dot = fileName.lastIndexOf(".");
int sep = fileName.replace("\\", "/").lastIndexOf("/");
String NF=fileName.substring(sep + 1, dot);
String extendeed= fileName.substring(dot + 1);
NF=NF+"."+extendeed;
return NF;
}

String getExt(String fileName){
int dot = fileName.lastIndexOf(".");
String extendeed= fileName.substring(dot + 1);
return extendeed;
}

boolean cekFile(String nf){
boolean sudah=true;
File file = new File(nf);
if (!file.exists()) {
sudah=false;
}
return sudah;
}

boolean cekFileDel(String nf){
boolean sudah=false;
File file = new File(nf);
if (file.exists()) {
file.delete();
sudah=true;
}
return sudah;
}

++++++++++++++
String sTB(byte[]result){
String str = Base64.encode(result);//encodeBase64String
return str;
}

byte [] sTB2(String s){
char [] x = s.toCharArray();
byte [] hs = new byte[x.length];
for (int i = 0;i<x.length;i++){
hs [i] = (byte) (int)x[i];
}
return hs;
}

byte[] sTB (String s) throws Base64DecodingException{
byte [] hs = Base64.decode(s);
return hs;
}

byte[]btS(String content) throws Base64DecodingException{
byte[]dika=Base64.decode(content);
return dika;
}

String bTS(byte[]result){
String str = Base64.encode(result);//encodeBase64String
return str;
}

private void saveData(String dataEncrypt,String mpath) {
String kompress=dataEncrypt;//lz.compress(dataEncrypt, null);
char[]ar2=kompress.toCharArray();
byte[]data3=new byte[ar2.length];
for(int i=0;i<ar2.length;i++){
data3[i]=(byte)(int)ar2[i];
}
try{
this.saveByte(data3,mpath);
} catch (Exception e) {
e.printStackTrace();
}

}

private void saveByte(byte[] dataDecrypt,String fileNameEncrypt) throws IOException {
Path path = Paths.get(fileNameEncrypt);
Files.write(path, dataDecrypt); //creates, overwrites
System.out.println("File Berhasil di dekripsi ! lihat di : " +fileNameEncrypt);
}

static void saveString(String dataEncrypt,String namaFile) {
try {
String content = dataEncrypt;
File file = new File(namaFile);
if (!file.exists()) {
file.createNewFile();
}

FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(content);
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}

Source :http://kriptografi-adiarray.blogspot.co.id/2016/12/source-code-kriptografi.html