首先,这是我遇到的错误
java.lang.OutOfMemoryError
at coderaustin.com.FileEncryptor.encryptFile(FileEncryptor.java:56)
at coderaustin.com.Main.onCreate(Main.java:41)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1069)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2751)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2803)
at android.app.ActivityThread.access$2300(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2136)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:144)
at android.app.ActivityThread.main(ActivityThread.java:4937)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
显然我知道错误是什么,只是不知道如何避免它。这就是我的应用程序的作用,
您选择一个文件,然后单击“加密”。显然,它从那里获取文件,并使用此代码对其进行加密
try {
FileInputStream inFile = new FileInputStream(f.getAbsolutePath());
FileOutputStream outFile = new FileOutputStream(f.getAbsoluteFile() + ".des");
PBEKeySpec keySpec = new PBEKeySpec(text.toCharArray());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey passwordKey = keyFactory.generateSecret(keySpec);
byte[] salt = new byte[8];
Random rnd = new Random();
rnd.nextBytes(salt);
int iterations = 100;
PBEParameterSpec paramaterSpec = new PBEParameterSpec(salt, iterations);
Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
cipher.init(Cipher.ENCRYPT_MODE, passwordKey, paramaterSpec);
outFile.write(salt);
byte[] input = new byte[inFile.available()];
int bytesRead;
while ((bytesRead = inFile.read(input)) != -1)
{
byte[] output = cipher.update(input, 0, bytesRead);
if (output != null) outFile.write(output);
}
byte[] output = cipher.doFinal();
if (output != null) outFile.write(output);
f.delete();
inFile.close();
outFile.flush();
outFile.close();
是的,我知道代码很丑陋,但它有效。有什么建议吗?
谢谢大家:)
编辑:这是第 56 行
byte[] input = new byte[inFile.available()];
最佳答案
奇怪:如果文件很大,我可以看出这可能是一个问题。为什么要一次读取整个文件而不是分成小块读取并处理?
编辑:试试这个。
byte[] input = new byte[4096];
int bytesRead;
while ((bytesRead = inFile.read(input, 0, 4096)) != -1)
{
byte[] output = cipher.update(input, 0, bytesRead);
if (output != null) outFile.write(output);
}
关于java - 加密时出现 OutOfMemory 错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6182668/