域对象:ServletContext
l void setAttribute(String name, Object value):存储属性;
l Object getAttribute(String name):获取属性;
l void removeAttribute(String name):移除属性;
l Enumeration getAttributeNames():获取所有属性名称;
域对象:ServletContext
l void setAttribute(String name, Object value):存储属性;
l Object getAttribute(String name):获取属性;
l void removeAttribute(String name):移除属性;
l Enumeration getAttributeNames():获取所有属性名称;