生成图片验证码时遇到的问题

Eclipse 警告提示：Access restriction:The type JPEGCodec is not accessible due to restriction on  

两种解决方案： 
1：Windows -> Preferences -> Java -> Compiler -> Errors/Warnings -> Deprecated and trstricted API -> Forbidden reference (access rules): -> 改变为 warning

2：[Project] -> Properties -> Java Build Path -> Libraries -> Remove JRE System Library 
   Add Library -> JRE System Library -> Click OK