Javamail API 를 이용해서 base64 인코딩하는 방법

import com.sun.mail.util.BASE64EncoderStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.io.IOException;
 
String text = "테스트";
 
String charset = StandardCharsets.UTF_8.name();
ByteArrayOutputStream baos = null;
BASE64EncoderStream stream = null;
try {
    baos = new ByteArrayOutputStream();
    stream = new BASE64EncoderStream(baos);
    stream.write(text.getBytes(charset));
    stream.flush();
    String base64EncodedText = baos.toString();
    stream.close();
    stream = null;
    baos.close();
    baos = null;
} catch (IOException e) {
 
} finally {
    if(stream != null) {
        try {
            stream.close();
            stream = null;
        } catch (IOException e) {
 
        }
    }
    if(baos != null) {
        try {
            baos.close();
            baos = null;
        } catch (IOException e) {
 
        }
    }
}

stream.flush(); 를 생략하면, 마지막 글자 일부가 잘릴 가능성이 높다는 것에 주의하라.