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Maybe the struts doc is what you need.
Actually my problems with the jsp page is,the user didnt enter any information on particularly textbox,textfield ,it is going to previous jsp page without validating,so the user want to do server side validation (not client side validation) ,how to achieve it on each textbox,textfield,Please come up with solution of server side validation code...:_|
With regards :-x
Please check the link Fred has provided.
I guess he is pointing you to the vlaidator framework of struts which does server side validations. (can also do client side validations).
If you want the validation to happen as and when the user changes data in each form element, you probably want to look at AJAX.