## 監聽Javabean在session中的狀態變化 ### HttpSessionBindingListener(解綁和綁定) 綁定 :Javabean放入了session. 解綁:Javabean從session中移除. 不需要配置web.xml文件. ~~~ public class Account implements HttpSessionBindingListener //需要實現此接口 { private String username; private String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } //重寫下面兩個方法 @Override public void valueBound(HttpSessionBindingEvent httpSessionBindingEvent) { System.out.println("seesion和bean綁定了"); } @Override public void valueUnbound(HttpSessionBindingEvent httpSessionBindingEvent) { System.out.println("seesion和bean解綁了"); } } ~~~ 綁定 ~~~ <% session.setAttribute("account", new Account()); %> ~~~ 解綁 ~~~ <% session.removeAttribute("account"); %> ~~~ ### HttpSessionActivationListener(鈍化和活化) ### 注意