Java 如何从文件中读取字节到 byte[] 数组？
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How to read bytes from a file to a byte[] array?
提问by daipayan
I am writing a Java program which encrypts a given text using RSA, and saves the encrypted bytes(byte[] array) in a .txt file. There is a separate decryption program which reads these bytes. Now I want to read the same bytes into a byte[] in to the decryption program. How can this be done using Java?
我正在编写一个 Java 程序，它使用 RSA 加密给定的文本，并将加密的字节（字节 [] 数组）保存在 .txt 文件中。有一个单独的解密程序可以读取这些字节。现在我想将相同的字节读入解密程序中的字节 []。如何使用 Java 完成此操作？
BufferedReader brip = new BufferedReader(new FileReader("encrypted.txt"));
Strings CurrentLine = brip.readLine();
byte[] b = sCurrentLine.getBytes();
This is how I have been reading the data from the file. But it's wrong because it converts the bytes in sCurrentLine variable into again bytes.
这就是我从文件中读取数据的方式。但这是错误的，因为它将 sCurrentLine 变量中的字节再次转换为字节。
回答by Raf
In Java 7 you can use the readAllBytes()method of Files class. See below:
在 Java 7 中，您可以使用Files 类的readAllBytes()方法。见下文：
Path fileLocation = Paths.get("C:\test_java\file.txt");
byte[] data = Files.readAllBytes(fileLocation);
回答by Shahzad Afridi
This code worked for me, in an android project so hopefully, it will work for you.
这段代码对我有用，在一个 android 项目中，所以希望它对你有用。
private byte[] getByte(String path) {
byte[] getBytes = {};
try {
File file = new File(path);
getBytes = new byte[(int) file.length()];
InputStream is = new FileInputStream(file);
is.read(getBytes);
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return getBytes;
}
