java - 如何在Java中从文件中读取特定数量的字节到字节数组中？

Question

我想读取文件的 128 字节并将其放入字节数组中以对 128 字节进行一些处理。这应该迭代文件的整个长度(即每次读取接下来的 128 个字节并将其存储到字节数组中并进行处理)。我目前能够将文件中的所有字节读取到单个字节数组中。

public static void main(String[] args) throws IOException {

    Path path = Paths.get("path/t/file");
    byte[] bytes = Files.readAllBytes(path);              }

任何帮助将不胜感激。

Answer 1

您应该只使用 FileInputStream:

    try {
        File file = new File("file.ext");
        RandomAccessFile data = new RandomAccessFile(file, "r");

        byte[] fullBytes = new byte[(int) file.length()];
        byte[] processBytes = new byte[128];

        for (long i = 0, len = file.length() / 128; i < len; i++) {
            data.readFully(processBytes);

            // do something with the 128 bytes (processBytes).
            processBytes = ByteProcessor.process(processBytes)

            // add the processed bytes to the full bytes array
            System.arraycopy(processBytes, 0, fullBytes, processBytes.length, fullBytes.length);

        }

    } catch (IOException ex) {
        // catch exceptions.
    }