csdn鏈接：https://blog.csdn.net/Cha0DD/article/details/87794268?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param

原方法

BASE64Encoder encoder = new BASE64Encoder();

String imagestr =? encoder.encode(captcha);

BASE64Decoder decoder = new BASE64Decoder();

byte[] bytes = decoder.decodeBuffer(imagestr);

現方法

import java.util.Base64.Encoder
import java.util.Base64.Decoder
?
Encoder encoder = Base64.getEncoder();
String result = encoder.encodeToString(byteArray);
?
Decoder decoder = Base64.getDecoder();
byte[] result = decoder.decode(str);
原因是/lib/tool.jar和/lib/rt.jar已經從Java SE 9中刪除