how to send an object from jsp to servlet

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Passing Object from JSP to Servlet

I have an object that is being sent successfully from a servlet to a jsp. In that jsp page I have a button and when user click on that button the same object should be sent from that jsp page to another servlet. how can I do that ??

score 4 · Answer 1 · edited May 23 '17 at 10:09

4

Send it as request attribut when clicking on button a) Set request attrbute in jsp

request.setAttribute("thatobject",thatobject);

In Servlet retrive it as

Thatobject obj = (ThatObject) request.getAttribute("thatobject");

b) Set the object in session session.setAttribute("thatobject",thatobject) and retrive it as

Thatobject obj = (ThatObject) session.getAttribute("thatobject");

Oh my mistake Updated...

Note: Also iam not providing null check. I think you can handle it

Edit:

Even you can do other way, which is very sofistiacted way,

a) Create a Bean class
b) provide Object as a attribute in bean class and provide getter and setter methods too
C) in jsp use that bean to set the object when the page is submitting to servlet
d) retrive the object from the bean in servelt

Edit 2:

Please check this link there is clear explanation. JSP2Servlet

Edit 3

Note : If you are submiting form , the request becomes new request and the object will become null, when you use request.getattribute in servlet. So above approach will not work on Form submit in jsp.

So to overcome this please folw the instructions provide in below link

Passing Object from JSP to Servlet

edited May 23 '17 at 10:09

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answered May 21 '12 at 07:47

developer

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Damodar check the return type of the getParameter method, it will return only a String, so ur snippet will fail. it should be something like this `String userName = request.getParameter("userName");` – Rajesh Pitty May 21 '12 at 07:52
Great Damodar. Jigar thats the way to do it, if you do not require an updated object. – Rajesh Pitty May 21 '12 at 08:02
I provide for updated object too – developer May 21 '12 at 08:07
@Damodar: This won't work either. `.setAttribute()` always returns null when you try to get them on servlet. – Hardik Mishra May 21 '12 at 08:21
@HardikMishra Please can you explain why it wnot works – developer May 21 '12 at 08:32
how can I forward that object from the jsp page? – user1407310 May 21 '12 at 09:15
request.setAttribute("thatobject",thatobject); – developer May 21 '12 at 09:20
@Damodar: Please try your self that setting `request.setAttribute` in JSP will result NULL when you access it from Servlet using `request.getAttribute()`. – Hardik Mishra May 21 '12 at 09:24
@HardikMishra you mean even Java doc says wrong. Please check the below url http://docs.oracle.com/cd/A97336_01/buslog.102/a83726/basics4.htm#1014142 .Please check code under Code for Jsp2Servlet.jsp otherwise give me the reason behind to make your statement strong – developer May 21 '12 at 09:34
@Damodar: The link says "Invoking a JSP Page from a Servlet" which is correct. Here You are talking about 'Servlet to JSP' which is different. No hard feelings. – Hardik Mishra May 21 '12 at 09:40
@HardikMishra please did you check at the bottom with heading "JSP-Servlet Interaction Samples" – developer May 21 '12 at 09:47
@Damodar: It works as per given example. but when you submit form it does not. Clarify your answer then. :) – Hardik Mishra May 21 '12 at 09:49
@HardikMishra you mean, on form submission do that value of the object becomes null? – developer May 21 '12 at 09:57
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/11509/discussion-between-hardik-mishra-and-damodar) – Hardik Mishra May 21 '12 at 09:58

how to send an object from jsp to servlet

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