JAVA中如何将图片读取成Base64

public String base64(String imgFile) throws IOException {
    File file = new File(imgFile);
    try (FileInputStream fis = new FileInputStream(imgFile)) {
        byte[] bytes = new byte[(int) file.length()];
        fis.read(bytes);
        String base64 = new String(Base64.getEncoder().encode(bytes), StandardCharsets.UTF_8);
        return base64;
    }
}