Access restriction: The type 'BASE64Encoder'

Access restriction: The type 'BASE64Encoder' is not API (restriction on required library 'D:\Java\jdk1.6.0_43\jre\lib\rt.jar') eclipse引入import sun.misc.BASE64Encoder; 是红叉，怎么解决？ 右键项目，点属性（Properties）； j

>>阅读原文<<