sun.misc.BASE64Decoder 导入 错误

http://sky4160864.javaeye.com/blog/772896

试验成功

import="sun.misc.BASE64Decoder"
出现错误提示为：Access restriction: The type BASE64Decoder is not accessible due to restriction
on required library D:/ProgramFiles/MyEclipse/jre/lib/rt.jar
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安装国外论坛的方法解决了，如下：
1. Open project properties.
2. Select Java Build Path node.
3. Select Libraries tab.
4. Remove JRE System Library.
5. Add Library JRE System Library.