MappedByteBuffer 替代unmap方案

public static void clean(final Object buffer) throws Exception {
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
try {
Method getCleanerMethod = buffer.getClass().getMethod("cleaner",new Class[0]);
getCleanerMethod.setAccessible(true);
sun.misc.Cleaner cleaner =(sun.misc.Cleaner)getCleanerMethod.invoke(buffer,new Object[0]);
cleaner.clean();
} catch(Exception e) {
e.printStackTrace();
}
return null;}});

}