sun.misc.BASE64Encoder找不到jar包的解決方法(eclipse中紅叉)

1.右鍵項目-》屬性-》java bulid path-》jre System Library-》access rules-》resolution選擇accessible，下面填上** 點擊確定即可！！！

2.

在MyEclipse中編寫Java代碼時，用到了BASE64Decoder，import sun.misc.BASE64Decoder；可是Eclipse提示： 
Access restriction: The type BASE64Decoder is not accessible due to restriction on required library C:\Program 
files\java\jre6\lib\rt.jar 
Access restriction : The constructor BASE64Decoder() is not accessible due to restriction on required library C:\Program files\java\jre6\lib\rt.jar 

解決方案1（推薦）： 
只需要在project build path中先移除JRE System Library，再添加庫JRE System Library，重新編譯後就一切正常了。