读取二进制文件为byte []并从servlet发送为char []

File file = new File("path/to/file.bin");
byte[] fileData = new byte[(int) file.length()];
try (FileInputStream fis = new FileInputStream(file)) {
    fis.read(fileData);
} catch (IOException e) {
    e.printStackTrace();
}

String fileContent = new String(fileData, StandardCharsets.UTF_8);
char[] charData = fileContent.toCharArray();

response.setContentType("text/plain");
try (PrintWriter out = response.getWriter()) {
    out.print(charData);
} catch (IOException e) {
    e.printStackTrace();
}