我如何将文件作为字节读取然后在 java ( android ) 中将其编码为 base64

Question

How can I read files as bytes and then encode it to base64 by java with low api like : api level 17?

I tried this code to convert files to base64:

Java Encode file to Base64 string To match with other encoded string

Answer 1

File file = new File(filepath);
byte[] fileContent = Files.readAllBytes(file.toPath());
String encodedString = Base64.getEncoder().encodeToString(fileContent.getBytes());

For old api use FileUtils.readFileToByteArray(File file) or IOUtils.toByteArray(InputStream input) .