在做ftp，代码中引用
import sun.net.ftp.FtpClient;
报如下错误
Access restriction: The type FtpClient is not accessible due to restriction on required library D:\Program Files\Java\jre6\lib\rt.jar
sun.net包里的，在eclipse里默认是不让用的。解决办法是自定义access rules
工程上右键->工程属性->java builder path->Libraries标签，点击JRE System Library里面的Access rules，add sun/** 为accessible，如果该项存在，就edit。
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