BASE64Encoder cannot be resolved to a type
或者
BASE64Decoder cannot be resolved to a type
sun.misc.BASE64Encoder/sun.misc.BASE64Decoder类不属于JDK标准库范畴
但是，在JDK中包含了该类，也可以直接使用
使用时，在eclipse或者MyEclipse中会发现找不到该类
此时我们需要做的就是：
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