1. Use the listener to track the life cycle of the session
Method: Create a listener that implements the HTTPSessionListener interface, then register the class again at the deployment description file.
Note: Servlet API provides a Javax.Servlet.http.httpSessionListener interface to respond to sessions creation and destruction. This interface defines two methods: sessionCreated () and sessionDestoryed (), each method accepts an HttpSessionEvent parameter. (Implementing a class to provide a parameter-free constructor).
E G: Public Class SessionListener Implements HttpSessionListenceListence {
PUBLIC sessionListener () {};
Public void sessioncreated (httpsessioneverive) {
// code
}
Public void sessionDestoryed (httpsessionever event event) {
// code
}
}
Finally, register the listener in web.xml
II. Listener tracking the properties of the session
Method: Create a listener that implements the HTTPSESESSATRIBURTELISTENER interface and register the class again at the deployment description file.
Note: Servlet API provides a javax.servlet.http.httpsessionattriburtelistener interface that defines three ways: Attributeadd (), AttributeRemove (), AttributeREPLACE (), three methods accept an HttpSessionBingDingevent type parameter. (Implementing a class to provide a parameter-free constructor).
E g: public class sessionattributeListener imports httpsessionattributeListenter {
Public sessionattributeListener () {};
Public void attributeadded (httpsessionBindingEvent evenet) {
// code
}
Public void attributemove (httpsessionBindingEvent evenet) {
// code
}
Public void attributeplace (httpsessionBindingEvent evenet) {
}
Finally, register the listener in web.xml
