JSP Tutorial #15 - JSP Built-In Server Objects

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JSP Tutorial Transcript

Hey, in this video I'm going to show you how to make use of JSP Built-In Server Objects. What Built-In Server Objects, these are given to you for free so there's no need to create them, you can simply use them directly in your JSP page. We've actually played around with some of these earlier, and I'll show you this on the next slide. Here is the list of the commonly used JSP Server Objects. Starting here at the top with request, it contains information about the HTTP request headers and also form data, we're going to use this a lot in some of the following videos for reading form data. There's also the response object for sending back HTTP specific information and we will use this also in the following video on making use of cookies. This one Server object you use already, the out Object, and we use that for our out dot print line in one of the previous videos. Again, a Built-In Server Object given to you for free.

There's two others here, session, it's a unique session for each user. You can think of the Session Object as like the shopping cart, each user has their own unique shopping cart, we will use this on the following video. Finally there's the Application Object, this is shared for all users of a given web app and I'll discuss various use cases on how to use the Application Object. Just for disclaimer, this is not an exhaustive list, there're other server objects out there but these are the ones that are commonly used for JSP web apps. Here's the idea, you have the browser communicating with the JSP, behind the scenes the HTTP protocol, they actually send our request object, this request object contains header information and body information. JSP can perform some work on that information and then send back a response, so we have the whole request response protocol going. In the demo I'll show you how to make use of the request object.

[snip] for complete JSP tutorial transcript, select "More ... Transcript"

[fleurdevries]

Thank you. You have a talent for explanation and made the videos not too long but very transparent

[sehamalharbi]

Really nice and understandable explanation, helped a lot with my university JSP project. thanks a lot.

[freerunner]

İ couldn't get something. Firstly, at 1:57 ; the image shows request is
coming from the client and response is going to client. But here in jsp
file ( jsp runs at server), we write request.getHeader(); so as i
understand server is requesting information from client. Is that true ?
If so ; is request-response process occurs in both directions
(client-server and server-client) ? thanks

[brandonflorida]

You are a fabulous teacher. Please record more.

[TheLordMyRock]

I have everything written the same and it actually runs with no error but there's a red x on row 11 and red underline under the second % symbol and it's saying it expects a ")" value?

[mdsaddamhosen]

your programming tutorial very helpful for beginning.carry on sir

[mdsaddamhosen]

You are helpful.i like very much you attitude because of when i was a problem jsp programming .then you are some tips.i follow that tips, i could problem solved.

[gabbar]

Sir please tell me code of insert the excel data in MySQL using jsp

[zhengyuwang]

Hi, thanks for the tutorials. Please could you tell us more about the 3-layers architecture ?

[kunduRAHUL]

Thankyou for sharing such a valuable information.

[bishnugaire]

Request user agent:null ??? Why it showing this???