jdk17 package sun.misc.BASE64Encoder 报找不到符号

解决办法：

对于只需要Base64编码的简单场景，可以考虑使用Java 8及以上版本提供的内置`java.util.Base64`类，这是一个标准API，无需额外引入任何库： 

//import sun.misc.BASE64Encoder; // java8
import java.util.Base64;       // java17

public class Base64EncodingExample {
    public static void main(String[] args) {
        String textToEncode = "Hello, World!";
        String encoded = Base64.getEncoder().encodeToString(textToEncode.getBytes());
        System.out.println("Encoded: " + encoded);
        String decoded = new String(Base64.getDecoder().decode(encoded));
        System.out.println("Decoded: " + decoded);
    }
}

参考：https://download.csdn.net/download/qq_36386526/10175811?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-download-2%7Edefault%7ECTRLIST%7ECtr-1-10175811-blog-125922071.235%5Ev43%5Epc_blog_bottom_relevance_base3&depth_1-utm_source=distribute.pc_relevant.none-task-download-2%7Edefault%7ECTRLIST%7ECtr-1-10175811-blog-125922071.235%5Ev43%5Epc_blog_bottom_relevance_base3&utm_relevant_index=2