Penyimpanan file yang disediakan oleh mPaaS menawarkan kemampuan enkripsi file berdasarkan File asli Android.
Penting: Karena enkripsi file menggunakan fungsi enkripsi yang disediakan oleh Mobile Security Guard, pastikan bahwa gambar enkripsi di Mobile Security Guard telah dibuat dengan benar.
Jenis-jenis file
- ZFile: Jenis file ini disimpan di
data/data/package_name/files. - ZExternalFile: Jenis file ini disimpan di
sdcard/Android/data/package_name/files. - ZFileInputStream/ZFileOutputStream: Aliran input/output penyimpanan file. File tidak akan dienkripsi jika Anda menggunakan aliran ini.
- ZSecurityFileInputStream/ZSecurityFileOutputStream: Aliran input/output penyimpanan file. File akan dienkripsi jika Anda menggunakan aliran ini.
Contoh
Mengonversi File ke Teks
/**
* Mengonversi file ke teks
* @param file: File
* @return Teks
*/
public String file2String(File file) {
InputStreamReader reader = null;
StringWriter writer = new StringWriter();
try {
// Gunakan aliran input dekripsi ZSecurityFileInputStream
// Jika Anda tidak menggunakan fungsi enkripsi/dekripsi, maka gunakan ZFileInputStream
reader = new InputStreamReader(new ZSecurityFileInputStream(file, this));
//Tulis aliran input ke dalam aliran output
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
int n = 0;
while (-1 != (n = reader.read(buffer))) {
writer.write(buffer, 0, n);
}
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (reader != null)
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
//Kembalikan hasil konversi
if (writer != null) {
return writer.toString();
} else {
return null;
}
}Mengonversi Teks ke File
/**
* Mengonversi teks ke file
* @param res: Teks
* @param file: File
* @return true berarti berhasil sementara false berarti gagal
*/
public boolean string2File(String res, File file) {
boolean flag = true;
BufferedReader bufferedReader = null;
BufferedWriter bufferedWriter;
try {
bufferedReader = new BufferedReader(new StringReader(res));
// Gunakan aliran output dekripsi ZSecurityFileOutputStream
// Jika Anda tidak menggunakan fungsi enkripsi/dekripsi, maka gunakan ZFileOutputStream
bufferedWriter = new BufferedWriter(new OutputStreamWriter(new ZSecurityFileOutputStream(file, this)));
//Buffer karakter
char buf[] = new char[DEFAULT_BUFFER_SIZE];
int len;
while ((len = bufferedReader.read(buf)) != -1) {
bufferedWriter.write(buf, 0, len);
}
bufferedWriter.flush();
bufferedReader.close();
bufferedWriter.close();
} catch (Exception e) {
e.printStackTrace();
flag = false;
return flag;
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}Menyisipkan File
/**
* Menyisipkan file
*
* @param file: File
*/
private void insertFile(BaseFile file) {
if (null == file) {
return;
}
StringBuilder sb = new StringBuilder();
String content = sb.append(file.getName())
.append(' ')
.append(SIMPLE_DATE_FORMAT.format(new Date(System.currentTimeMillis()))).toString();
string2File(content, file);
try {
if (!file.exists()) {
file.createNewFile();
}
mData.add(file);
} catch (Exception e) {
e.printStackTrace();
}
}Menghapus File
/**
* Menghapus file
*
* @param file: File
*/
private void deleteFile(BaseFile file) {
try {
file.delete();
mData.remove(file);
} catch (Exception e) {
e.printStackTrace();
}
}