我正在尝试使用AES加密文件，方法是将文件转换为base64，然后应用AES，但是我的SD卡上从来没有任何输出，看起来我正在抛出FileNotFoundException。我在这一行设置了一个断点：
SecretKeySpec secretKey = new SecretKeySpec(Password.getBytes("ASCII"), "AES");
但是我注意到只有在我选择文件夹时才会到达 - 但不是文件（在任何一种情况下：没有加密文件输出）。
另外 - 我不确定这一行是否正确：boolean encryptedString = MySecurity.encryptFile(chosenFile);
我只需要弄清楚为什么我不能使用这种方法加密文件。
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
01-16 19:54:50.551: I/System.out(18108): Sending WAIT chunk
01-16 19:54:50.556: I/dalvikvm(18108): Debugger is active
01-16 19:54:50.751: I/System.out(18108): Debugger has connected
01-16 19:54:50.751: I/System.out(18108): waiting for debugger to settle...
01-16 19:54:50.951: I/System.out(18108): waiting for debugger to settle...
01-16 19:54:51.151: I/System.out(18108): waiting for debugger to settle...
01-16 19:54:51.351: I/System.out(18108): waiting for debugger to settle...
01-16 19:54:51.551: I/System.out(18108): waiting for debugger to settle...
01-16 19:54:51.751: I/System.out(18108): waiting for debugger to settle...
01-16 19:54:51.956: I/System.out(18108): waiting for debugger to settle...
01-16 19:54:52.156: I/System.out(18108): debugger has settled (1454)
01-16 19:54:52.416: E/SensorManager(18108): thread start
01-16 19:54:52.426: D/SensorManager(18108): registerListener :: handle = 0 name= K3DH Acceleration Sensor delay= 200000 Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,*b-c)b8
01-16 19:54:52.476: D/SensorManager(18108): unregisterListener:: Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,*b-c)b8
01-16 19:54:52.476: D/Sensors(18108): Remain listener = Sending .. normal delay 200ms
01-16 19:54:52.476: I/Sensors(18108): sendDelay --- 200000000
01-16 19:54:52.476: D/SensorManager(18108): JNI - sendDelay
01-16 19:54:52.476: I/SensorManager(18108): Set normal delay = true
01-16 19:54:52.516: D/SensorManager(18108): registerListener :: handle = 0 name= K3DH Acceleration Sensor delay= 200000 Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,*b-c)b8
01-16 19:54:52.546: D/libEGL(18108): loaded /system/lib/egl/libEGL_mali.so
01-16 19:54:52.546: D/libEGL(18108): loaded /system/lib/egl/libGLESv1_CM_mali.so
01-16 19:54:52.551: D/libEGL(18108): loaded /system/lib/egl/libGLESv2_mali.so
01-16 19:54:52.556: D/(18108): Device driver API match
01-16 19:54:52.556: D/(18108): Device driver API version: 10
01-16 19:54:52.556: D/(18108): User space API version: 10
01-16 19:54:52.556: D/(18108): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Thu Oct 25 08:43:05 KST 2012
01-16 19:54:52.576: D/OpenGLRenderer(18108): Enabling debug mode 0
01-16 19:54:55.901: D/SensorManager(18108): unregisterListener:: Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,*b-c)b8
01-16 19:54:55.901: D/Sensors(18108): Remain listener = Sending .. normal delay 200ms
01-16 19:54:55.901: I/Sensors(18108): sendDelay --- 200000000
01-16 19:54:55.901: D/SensorManager(18108): JNI - sendDelay
01-16 19:54:55.901: I/SensorManager(18108): Set normal delay = true
01-16 19:54:56.806: D/SensorManager(18108): registerListener :: handle = 0 name= K3DH Acceleration Sensor delay= 200000 Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,*b-c)b8
01-16 19:54:58.341: D/dalvikvm(18108): GC_CONCURRENT freed 121K, 13% free 9638K/11015K, paused 12ms+12ms, total 37ms
01-16 19:54:58.361: D/DIRECTORY(18108): LOST.DIR
01-16 19:54:58.361: D/DIRECTORY(18108): external_sd
01-16 19:54:58.361: D/DIRECTORY(18108): usbStorage
01-16 19:54:58.361: D/DIRECTORY(18108): DCIM
01-16 19:54:58.361: D/DIRECTORY(18108): Android
01-16 19:54:58.361: D/DIRECTORY(18108): ShareViaWifi
01-16 19:54:58.361: D/DIRECTORY(18108): Attachments
01-16 19:54:58.361: D/DIRECTORY(18108): LazyList
01-16 19:54:58.361: D/FILE(18108): syncast.3gp
01-16 19:54:58.366: D/DIRECTORY(18108): download
01-16 19:54:58.366: D/FILE(18108): test.mp3
01-16 19:54:58.366: D/DIRECTORY(18108): ScreenCapture
01-16 19:54:58.366: D/FILE(18108): mp3.sdp
01-16 19:54:58.366: D/DIRECTORY(18108): Videomaker
01-16 19:54:58.366: D/DIRECTORY(18108): bluetooth
01-16 19:54:58.366: D/DIRECTORY(18108): Notifications
01-16 19:54:58.366: D/DIRECTORY(18108): Music
01-16 19:54:58.366: D/DIRECTORY(18108): Podcasts
01-16 19:54:58.371: D/DIRECTORY(18108): Ringtones
01-16 19:54:58.371: D/DIRECTORY(18108): Alarms
01-16 19:54:58.371: D/DIRECTORY(18108): Pictures
01-16 19:54:58.371: D/DIRECTORY(18108): Movies
01-16 19:54:58.371: D/DIRECTORY(18108): EarthRot
01-16 19:54:58.371: D/DIRECTORY(18108): projectM
01-16 19:54:58.371: D/DIRECTORY(18108): jibbigo
01-16 19:54:58.371: D/FILE(18108): darkknight.mp4
01-16 19:54:58.371: D/FILE(18108): idg-wallpaper-signed.apk
01-16 19:54:58.371: D/FILE(18108): DiskCacheIndex-1154456374.tmp
01-16 19:54:58.376: D/DIRECTORY(18108): Photo Editor
01-16 19:54:58.376: D/DIRECTORY(18108): SC2
01-16 19:54:58.376: D/DIRECTORY(18108): data
01-16 19:54:58.376: D/DIRECTORY(18108): Galaxier
01-16 19:54:58.376: D/DIRECTORY(18108): samsungapps
01-16 19:54:58.376: D/FILE(18108): tmp.jpg
01-16 19:54:58.376: D/FILE(18108): syncasterstream9760825383gp
01-16 19:54:58.376: D/FILE(18108): syncasterstream9075633613gp
01-16 19:54:58.376: D/FILE(18108): syncasterstream14259657453gp
01-16 19:54:58.381: D/FILE(18108): syncasterstream5539679723gp
01-16 19:54:58.381: D/FILE(18108): syncasterstream20634352173gp
01-16 19:54:58.381: D/FILE(18108): syncasterstream-15179503023gp
01-16 19:54:58.381: D/FILE(18108): syncasterstream3522853173gp
01-16 19:54:58.381: D/FILE(18108): syncasterstream-18907628143gp
01-16 19:54:58.381: D/FILE(18108): syncasterstream-14453506253gp
01-16 19:54:58.381: D/FILE(18108): Img1361203892838.jpg
01-16 19:54:58.381: D/FILE(18108): DiskCacheIndex739049279.tmp
01-16 19:54:58.381: D/FILE(18108): DiskCacheIndex-2062736231.tmp
01-16 19:54:58.386: D/FILE(18108): DiskCacheIndex-1094825277.tmp
01-16 19:54:58.386: D/FILE(18108): DiskCacheIndex887219410.tmp
01-16 19:54:58.386: D/FILE(18108): DiskCacheIndex1525162948.tmp
01-16 19:54:58.386: D/DIRECTORY(18108): Playlists
01-16 19:54:58.386: D/FILE(18108): darkknight.mp4.SEMP
01-16 19:54:58.386: D/DIRECTORY(18108): log
01-16 19:54:58.386: D/DIRECTORY(18108): media
01-16 19:54:58.386: D/DIRECTORY(18108): urbanspoon
01-16 19:54:58.386: D/DIRECTORY(18108): Nearby
01-16 19:54:58.386: D/DIRECTORY(18108): Documents
01-16 19:54:58.436: D/AbsListView(18108): Get MotionRecognitionManager
01-16 19:54:58.531: W/ResourceType(18108): Failure getting entry for 0x010802c0 (t=7 e=704) in package 0 (error -75)
01-16 19:54:58.546: D/F_PATH(18108): /storage/sdcard0
01-16 19:54:58.611: D/SensorManager(18108): unregisterListener:: Trklfufi 9 budiwrd5mrfo5WirfulblrwuFmfulTrklfufi$KfukwiFmfulTrklfufiRvht@,*b-c)b8
01-16 19:54:58.611: D/Sensors(18108): Remain listener = Sending .. normal delay 200ms
01-16 19:54:58.611: I/Sensors(18108): sendDelay --- 200000000
01-16 19:54:58.611: D/SensorManager(18108): JNI - sendDelay
01-16 19:54:58.611: I/SensorManager(18108): Set normal delay = true
01-16 19:55:00.811: D/DIRECTORY(18108): Camera
01-16 19:55:00.811: D/DIRECTORY(18108): Facebook
01-16 19:55:00.851: D/AbsListView(18108): Get MotionRecognitionManager
01-16 19:55:00.971: W/ResourceType(18108): Failure getting entry for 0x010802c0 (t=7 e=704) in package 0 (error -75)
01-16 19:55:00.986: D/F_PATH(18108): /storage/sdcard0/DCIM
01-16 19:55:07.706: D/F_PATH(18108): DCIM
01-16 19:55:36.996: W/System.err(18108): java.io.FileNotFoundException: /DCIM: open failed: ENOENT (No such file or directory)
01-16 19:55:37.006: W/System.err(18108): at libcore.io.IoBridge.open(IoBridge.java:416)
01-16 19:55:37.011: W/System.err(18108): at java.io.FileInputStream.<init>(FileInputStream.java:78)
01-16 19:55:37.016: W/System.err(18108): at java.io.FileInputStream.<init>(FileInputStream.java:105)
01-16 19:55:37.021: W/System.err(18108): at com.encrpytion.idg.MySecurity.encryptFile(MySecurity.java:83)
01-16 19:55:37.026: W/System.err(18108): at com.encrpytion.idg.FileExplore$3.onClick(FileExplore.java:175)
01-16 19:55:37.031: W/System.err(18108): at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:934)
01-16 19:55:37.036: W/System.err(18108): at android.widget.AdapterView.performItemClick(AdapterView.java:301)
01-16 19:55:37.041: W/System.err(18108): at android.widget.AbsListView.performItemClick(AbsListView.java:1280)
01-16 19:55:37.046: W/System.err(18108): at android.widget.AbsListView$PerformClick.run(AbsListView.java:3071)
01-16 19:55:37.051: W/System.err(18108): at android.widget.AbsListView$1.run(AbsListView.java:3973)
01-16 19:55:37.056: W/System.err(18108): at android.os.Handler.handleCallback(Handler.java:615)
01-16 19:55:37.056: W/System.err(18108): at android.os.Handler.dispatchMessage(Handler.java:92)
01-16 19:55:37.056: W/System.err(18108): at android.os.Looper.loop(Looper.java:137)
01-16 19:55:37.061: W/System.err(18108): at android.app.ActivityThread.main(ActivityThread.java:4921)
01-16 19:55:37.061: W/System.err(18108): at java.lang.reflect.Method.invokeNative(Native Method)
01-16 19:55:37.061: W/System.err(18108): at java.lang.reflect.Method.invoke(Method.java:511)
01-16 19:55:37.061: W/System.err(18108): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
01-16 19:55:37.066: W/System.err(18108): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
01-16 19:55:37.066: W/System.err(18108): at dalvik.system.NativeStart.main(Native Method)
01-16 19:55:37.066: W/System.err(18108): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
01-16 19:55:37.071: W/System.err(18108): at libcore.io.Posix.open(Native Method)
01-16 19:55:37.071: W/System.err(18108): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
01-16 19:55:37.076: W/System.err(18108): at libcore.io.IoBridge.open(IoBridge.java:400)
01-16 19:55:37.076: W/System.err(18108): ... 18 more
public class MySecurity
{
private static Cipher ecipher;
private Cipher dcipher;
private static String Password = "$emP0sTM@rkT0P$3cu!ty12345678912";
private static String InitialVector = "OFRna73m*aze01xY";
// ENCRYPTION ******************************************************
public String encryptText(String plainText)
{
String errorText = "Error";
try {
SecretKeySpec secretKey = new SecretKeySpec(Password.getBytes("ASCII"), "AES");
ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
ecipher.init(Cipher.ENCRYPT_MODE, secretKey, new IvParameterSpec(InitialVector.getBytes("ASCII")));
// Encode the string into bytes using utf-8
byte[] utf8 = plainText.getBytes("UTF8");
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
return Base64.encodeToString(enc, Base64.DEFAULT);
} catch (InvalidKeyException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
errorText = e.getMessage();
}catch (NoSuchAlgorithmException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
errorText = e.getMessage();
}catch (UnsupportedEncodingException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (BadPaddingException e) {
e.printStackTrace();
errorText = e.getMessage();
}
return errorText;
}
public static boolean encryptFile(String filePath)
{
try {
SecretKeySpec secretKey = new SecretKeySpec(Password.getBytes("ASCII"), "AES");
ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
ecipher.init(Cipher.ENCRYPT_MODE, secretKey, new IvParameterSpec(InitialVector.getBytes("ASCII")));
//create input stream to read in file that needs to be encrypted
FileInputStream inputStream = new FileInputStream(filePath);
//create output stream to write out the encrypted results, append .vault to out encrypted files
FileOutputStream outputStream = new FileOutputStream(filePath + ".vault");
//wrap the output stream
CipherOutputStream encryptedOutputStream = new CipherOutputStream(outputStream, ecipher);
// Encrypt the file
int bytes;
byte[] data = new byte[8];
while((bytes = inputStream.read(data)) != -1)
{
encryptedOutputStream.write(data, 0, bytes);
}
// Flush and close streams.
encryptedOutputStream.flush();
encryptedOutputStream.close();
inputStream.close();
outputStream.flush();
outputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
return false;
} catch (InvalidKeyException e) {
e.printStackTrace();
return false;
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
return false;
}catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return false;
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return false;
}catch (UnsupportedEncodingException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
public String decryptText(String cryptoText)
{
String errorText = "Error";
try {
SecretKeySpec secretKey = new SecretKeySpec(Password.getBytes("ASCII"), "AES");
dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
dcipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(InitialVector.getBytes("ASCII")));
// Decode base64 to get bytes
byte[] dec = Base64.decode(cryptoText, Base64.DEFAULT);
// Decrypt
byte[] utf8 = dcipher.doFinal(dec);
// Decode using utf-8
return new String(utf8, "UTF8");
} catch (InvalidKeyException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
errorText = e.getMessage();
}catch (NoSuchAlgorithmException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
errorText = e.getMessage();
}catch (UnsupportedEncodingException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
errorText = e.getMessage();
} catch (BadPaddingException e) {
e.printStackTrace();
errorText = e.getMessage();
}
return errorText;
}
public boolean decryptFile(String filePath)
{
try {
SecretKeySpec secretKey = new SecretKeySpec(Password.getBytes("ASCII"), "AES");
dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
dcipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(InitialVector.getBytes("ASCII")));
//create input stream to read in file that needs to be decrypted
FileInputStream inputStream = new FileInputStream(filePath);
//create output stream to write out the decrypted results, remove .vault to from file
FileOutputStream outputStream = new FileOutputStream(filePath.replace(".vault", filePath));
//wrap the output stream
CipherInputStream encryptedInputStream = new CipherInputStream(inputStream, dcipher);
//Decrypt the file
int bytes;
byte[] data = new byte[8];
while((bytes = encryptedInputStream.read(data)) != -1)
{
outputStream.write(data, 0, bytes);
}
// Flush and close streams.
outputStream.flush();
outputStream.close();
inputStream.close();
encryptedInputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
return false;
} catch (InvalidKeyException e) {
e.printStackTrace();
return false;
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
return false;
}catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return false;
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return false;
}catch (UnsupportedEncodingException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
}
public class FileExplore extends Activity {
// Stores names of traversed directories
ArrayList<String> str = new ArrayList<String>();
// Check if the first level of the directory structure is the one showing
private Boolean firstLvl = true;
private static final String TAG = "F_PATH";
private Item[] fileList;
private File path = new File(Environment.getExternalStorageDirectory() + "");
private String chosenFile;
private static final int DIALOG_LOAD_FILE = 1000;
ListAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
loadFileList();
showDialog(DIALOG_LOAD_FILE);
Log.d(TAG, path.getAbsolutePath());
}
private void loadFileList() {
try {
path.mkdirs();
} catch (SecurityException e) {
Log.e(TAG, "unable to write on the sd card ");
}
// Checks whether path exists
if (path.exists()) {
FilenameFilter filter = new FilenameFilter() {
@Override
public boolean accept(File dir, String filename) {
File sel = new File(dir, filename);
// Filters based on whether the file is hidden or not
return (sel.isFile() || sel.isDirectory())
&& !sel.isHidden();
}
};
String[] fList = path.list(filter);
fileList = new Item[fList.length];
for (int i = 0; i < fList.length; i++) {
fileList[i] = new Item(fList[i], R.drawable.file_icon);
// Convert into file path
File sel = new File(path, fList[i]);
// Set drawables
if (sel.isDirectory()) {
fileList[i].icon = R.drawable.directory_icon;
Log.d("DIRECTORY", fileList[i].file);
} else {
Log.d("FILE", fileList[i].file);
}
}
if (!firstLvl) {
Item temp[] = new Item[fileList.length + 1];
for (int i = 0; i < fileList.length; i++) {
temp[i + 1] = fileList[i];
}
temp[0] = new Item("Up", R.drawable.directory_up);
fileList = temp;
}
} else {
Log.e(TAG, "path does not exist");
}
adapter = new ArrayAdapter<Item>(this,
android.R.layout.select_dialog_item, android.R.id.text1,
fileList) {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// creates view
View view = super.getView(position, convertView, parent);
TextView textView = (TextView) view
.findViewById(android.R.id.text1);
// put the image on the text view
textView.setCompoundDrawablesWithIntrinsicBounds(
fileList[position].icon, 0, 0, 0);
// add margin between image and text (support various screen
// densities)
int dp5 = (int) (5 * getResources().getDisplayMetrics().density + 0.5f);
textView.setCompoundDrawablePadding(dp5);
return view;
}
};
}
private class Item {
public String file;
public int icon;
public Item(String file, Integer icon) {
this.file = file;
this.icon = icon;
}
@Override
public String toString() {
return file;
}
}
@Override
protected Dialog onCreateDialog(int id)
{
Dialog dialog = null;
AlertDialog.Builder builder = new Builder(this);
if (fileList == null) {
Log.e(TAG, "No files loaded");
dialog = builder.create();
return dialog;
}
switch (id) {
case DIALOG_LOAD_FILE:
builder.setTitle("Choose your file");
builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
chosenFile = fileList[which].file;
File sel = new File(path + "/" + chosenFile);
if (sel.isDirectory()) {
firstLvl = false;
// Adds chosen directory to list
str.add(chosenFile);
fileList = null;
path = new File(sel + "");
loadFileList();
removeDialog(DIALOG_LOAD_FILE);
showDialog(DIALOG_LOAD_FILE);
Log.d(TAG, path.getAbsolutePath());
Log.d(TAG,(chosenFile!=null)?chosenFile:"chosenFile is null");
boolean encryptedString = mySecurity.encryptFile(chosenFile);
}
// Checks if 'up' was clicked
else if (chosenFile.equalsIgnoreCase("up") && !sel.exists()) {
// present directory removed from list
String s = str.remove(str.size() - 1);
// path modified to exclude present directory
path = new File(path.toString().substring(0,
path.toString().lastIndexOf(s)));
fileList = null;
// if there are no more directories in the list, then
// its the first level
if (str.isEmpty()) {
firstLvl = true;
}
loadFileList();
removeDialog(DIALOG_LOAD_FILE);
showDialog(DIALOG_LOAD_FILE);
Log.d(TAG, path.getAbsolutePath());
Log.d(TAG,(chosenFile!=null)?chosenFile:"chosenFile is null");
boolean encryptedString = mySecurity.encryptFile(chosenFile);
}
// File picked
else {
// Perform action with file picked
}
}
});
break;
}
dialog = builder.show();
return dialog;
}
}
答案 0 :(得分：0)
来自FileInputStream()构造函数的文档......
FileInputStream（文件文件）
通过打开与实际文件的连接来创建FileInputStream，该文件是由文件系统中的File对象文件命名的文件。
因此，如果您要创建FileInputStream的实例，则必须将File对象传递给FileInputStream()。但是在下一行中，您传递的是文件路径而不是文件对象...
FileInputStream inputStream = new FileInputStream(filePath);
另一个问题是，您的filePath不正确。它只包含以下路径......
/DICM
这不是正确的路径，它不是实际的文件路径，而是文件夹路径。正确的路径应如下......
/mnt/sdcard/DICM
现在，如果您想解决问题，那么您必须遵循这些......
File对象。FileInputStream对象传递给File构造函数来创建FileInputStream()对象。现在，比如说，您的文件名为Text.txt，然后您的更正后的代码段将为....
public boolean decryptFile(String filePath)
{
try {
SecretKeySpec secretKey = new SecretKeySpec(Password.getBytes("ASCII"), "AES");
dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
dcipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(InitialVector.getBytes("ASCII")));
//Creating File object to into FileInputStream() constructor
String fileDirectory = Environment.getExternalStorageDirectory().getPath() + filePath;
String actualFilePath = fileDirectory + "/" + "Text.txt";
File actualFile = new File(actualFilePath);
//create input stream to read in file that needs to be decrypted
FileInputStream inputStream = new FileInputStream(actualFile);
//create output stream to write out the decrypted results, remove .vault to from file
FileOutputStream outputStream = new FileOutputStream(filePath.replace(".vault", filePath));
//wrap the output stream
CipherInputStream encryptedInputStream = new CipherInputStream(inputStream, dcipher);
//Decrypt the file
int bytes;
byte[] data = new byte[8];
while((bytes = encryptedInputStream.read(data)) != -1)
{
outputStream.write(data, 0, bytes);
}
// Flush and close streams.
outputStream.flush();
outputStream.close();
inputStream.close();
encryptedInputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
return false;
} catch (InvalidKeyException e) {
e.printStackTrace();
return false;
} catch (InvalidAlgorithmParameterException e) {
e.printStackTrace();
return false;
}catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return false;
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return false;
}catch (UnsupportedEncodingException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}