HttpSessionImpl.java 文件源码

/**
 * Removes the object bound with the specified name from
 * this session.
 */
public void removeAttribute(String name) {
  maybeThrowIllegalStateException();
  checkValid();
  Object value = getAttribute(name);
  // notify binding listeners
  if (value != null) {
    sessionData_.remove(name);
    updateCache();
    if (value instanceof HttpSessionBindingListener) {
      ((HttpSessionBindingListener) value).valueUnbound(
        new HttpSessionBindingEvent(this, name));
    }
  }
  // notify attribute listeners
  ServletSessionCache.getCache(cacheId_).
    notifySessionAttributeRemoved(this, name);
}