Question

我有一个会议变量,其价值也可以从java和Jsp改变。是否能够发现这一变数值何时发生变化?

Answer 1

http://java.sun.com/javaee/5/docs/api/javax/servlet/http/HttpSessionAttributeListener.html HttpSessionAttributeListener,每当价值被替换时,将随时通知你。通知说,在以下情况下(未建议过)它赢得了工作:

MyObject myobj = (MyObject)session.getAttribute("obj");
myobj.setValue(newValue);