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Editor to share with you how to deal with JSP Session, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

ASP programmers often have to deal with Application_start,Session_Start and so on in global.asa files.

Events, such as user authentication, redirecting different coding pages, etc., are very convenient, but JSP, which has always been popular, does not support this processing very much. Except for the commercial server JRun, which supports global.jsa, it does not even support the open source server tomcat, which has a very high application rate. This creates a lot of obstacles to the development of JSP, although early Tomcat (prior to version 5.0) can implement Session-start event handling in the following ways

1. Add Session

Session.put ("bind.listener", new MyListener (getservletContext ()

two。 Define the MyListener class

Import Javax.servlet.http.*

Import javax.servlet.*

Public class MyListener implements HttpSessionBindingListener

{

ServletContext context

Public ODSessionListener (ServletContext context)

{

This.context=context

}

Public void valueBound (HttpSessionBindingEvent event)

{

System.out.println ("bound")

}

Public void valueUnBound (HttpSessionBindingEvent event)

{

System.out.println ("unbound")

}

}

XML:namespace prefix = o ns = "urn:schemas-microsoft-com:Office:office" / >

However, the premise is that Session has been established and events such as verification cannot be handled when Session is created. Through the study of Servlet 2.4 (built-in Tomcat5.0), a feasible method has been found. The implementation method is as follows:

/ /-- SessionListener.java

Package listeners

Import javax.servlet.ServletContext

Import javax.servlet.ServletContextEvent

Import javax.servlet.ServletContextListener

Import javax.servlet.http.HttpSessionAttributeListener

Import javax.servlet.http.HttpSessionBindingEvent

Import javax.servlet.http.HttpSessionEvent

Import javax.servlet.http.HttpSessionListener

/ / ServletRequestListener adds an API for Servlet2.4

Import javax.servlet.ServletRequestListener

Import javax.servlet.ServletRequestEvent

Import javax.servlet.http.HttpServletRequest

Public final class SessionListener

Implements HttpSessionListener,ServletRequestListener {

Private HttpServletRequest request

Public void requestDestroyed (ServletRequestEvent sre) {}

Public void requestInitialized (ServletRequestEvent sre)

{

Request= (HttpServletRequest) sre.getServletRequest ()

}

Public void sessionCreated (HttpSessionEvent event) {

String logMsg=event.getSession () .getId ()

+ "'" + request.getRemoteAddr ()

+ ":" + request.getRemotePort ()

Log ("sessionCreated ('" + logMsg + "')")

}

Public void sessionDestroyed (HttpSessionEvent event) {

Log ("sessionDestroyed ('" + event.getSession (). GetId () + "')")

}

Private void log (String message) {

System.out.println ("SessionListener:" + message)

}

}

When you first receive a client request (requestInitialized), the current HttpRequest object is saved in the private member request, so that you can authenticate Session users when the Session is created, close Session, restrict IP address access, and so on. Here we only take recording the Session source as an example (SessionListener.java).

After compiling this class, add the following line to the host element of web.xml:

Listeners.SessionListener

The above is all the content of this article "how to deal with JSP Session". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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