解决办法:Access restriction: The type JPEGImageEncoder is not accessible due to restriction on required library D:\soft\dev\jdk1.6.0_17\jre\lib\rt.jar
Eclipse默认把这些受访问限制的API设成了ERROR。
只要把Windows-Preferences-Java-Complicer-Errors/Warnings里面的Deprecated and restricted API中的Forbidden references(access rules)选为Warning就可以编译通过。