java Base64 method

MyBase64.java

import java.util.Base64;

public class MyBase64{

  public static String base64(String str,int mode) throws InvalidParameterException{
          if (mode == 1) {
              byte[] bytes = str.getBytes();
              //Base64 加密
              String encoded = Base64.getEncoder().encodeToString(bytes);
              return encoded;
          } else if (mode == 2) {
              //Base64 解密
              byte[] decoded = Base64.getDecoder().decode(str);
              String decodeStr = new String(decoded);
              return decodeStr;
          }else {
            throw new InvalidParameterException();
        }
      }
}