我已经阅读了几篇关于 EBADF 错误的帖子，但没有解决我的问题。使我的案例与众不同的是我正在尝试写入 getFilesDir，它应该可由应用程序写入。
我在执行加密方法时收到 EBADF 错误。文件参数是使用以下方法创建的:
new File(mContext.getFilesDir(), "file.dat")
加密方法列表在哪里:
public static void encrypt(File file, String password, List<Object> objects) {
byte[] salt = generateSalt();
byte[] iv = generateIV();
Cipher c = createCipher(password, salt, Cipher.ENCRYPT_MODE, iv);
try (FileOutputStream fos = new FileOutputStream(file)) {
fos.write(salt);
fos.write(iv);
try (CipherOutputStream cos = new CipherOutputStream(fos, c);
ObjectOutputStream oos = new ObjectOutputStream(cos)) {
for (Object o : objects) {
oos.writeObject(o);
}
}
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
谁能看出我为什么会收到异常？
这是异常日志:
Caused by: java.lang.RuntimeException: java.io.IOException: write failed: EBADF (Bad file number)
at za.co.lot24media.password.util.EncryptUtil.encrypt(EncryptUtil.java:69)
at za.co.lot24media.password.store.Store.save(Store.java:94)
at za.co.lot24media.password.store.Store.createSamples(Store.java:179)
at za.co.lot24media.password.store.Store.load(Store.java:76)
at za.co.lot24media.password.activity.login.LoginAction$2.doInBackground(LoginAction.java:62)
at za.co.lot24media.password.activity.login.LoginAction$2.doInBackground(LoginAction.java:55)
at android.os.AsyncTask$2.call(AsyncTask.java:292)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.io.IOException: write failed: EBADF (Bad file number)
at libcore.io.IoBridge.write(IoBridge.java:502)
at java.io.FileOutputStream.write(FileOutputStream.java:186)
at java.io.OutputStream.write(OutputStream.java:82)
at javax.crypto.CipherOutputStream.close(CipherOutputStream.java:129)
at za.co.lot24media.password.util.EncryptUtil.encrypt(EncryptUtil.java:64)
** 已编辑 **
问题似乎与 ObjectOutputStream 写入 CipherOutputStream 有关。当我从 encrypt() 方法中删除 ObjectOutputStream 时，该方法成功。下面的代码有效:
public static void encrypt(File file, String password, StoreDataRecord storeDataRecord) {
byte[] salt = generateSalt();
byte[] iv = generateIV();
Cipher c = createCipher(password, salt, Cipher.ENCRYPT_MODE, iv);
try (FileOutputStream fos = new FileOutputStream(file)) {
fos.write(salt);
fos.write(iv);
try (CipherOutputStream cos = new CipherOutputStream(fos, c)) {
cos.write(new byte[10]);
}
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
我使用 byte[10] 只是为了将任意数据写入流。
** 编辑 2 **
以下解决方案也有效，首先将数据写入 ByteArrayOutputStream:
public static void encrypt(File file, String password, StoreDataRecord storeDataRecord) {
byte[] salt = generateSalt();
byte[] iv = generateIV();
Cipher c = createCipher(password, salt, Cipher.ENCRYPT_MODE, iv);
try (FileOutputStream fos = new FileOutputStream(file)) {
fos.write(salt);
fos.write(iv);
try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
CipherOutputStream cos = new CipherOutputStream(fos, c)) {
oos.writeObject(storeDataRecord.getVersion());
oos.writeObject(storeDataRecord.getItems());
cos.write(bos.toByteArray());
}
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
最佳答案
我看到你的encrypt 方法调用doInBackground 所以它会产生一些复杂的情况，比如移动到另一个 fragment 或创建 fragment 的两个实例，这让 android 感到困惑。最好的方法是在调用 onDestroy() 时忽略 encrypt 方法。
并确保您的流在使用前没有关闭。
希望对你有帮助
关于java - 安卓java.io.IOException : write failed: EBADF (Bad file number)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53496171/