base64找不到下面连个jar包也可以解决 import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; 报错: Access restriction: The type JPEGImageEncoder is not accessible due to restriction on required library C:\Java\jre1.6.0_07\lib\rt.jar 此时解决办法: Eclipse默认把这些受访问限制的API设成了ERROR。只要把Windows-Preferences-Java-Complic