CODEWITHSUNDEEP
javajspservletsweb
Ravi Sharma
Ravi Sharma

Reputation: 873

session to show message and back button

i have 3 jsp's :-

  1. a.jsp
  2. b.jsp
  3. c.jsp

From a.jsp i am going to b.jsp to show some result. And when the user update one of the record i call c.jsp which actually update it. So after updation it forward to a.jsp with a message saying "Successfully Updated" . And i set this message in session . And in a.jsp after showing this message. i invalidate the session.

The problem is , when i press the browser back button it still show the message. How can i solve this. Please help me. Thanks

Upvotes: 0

Views: 584

Answers (2)

Apurv
Apurv

Reputation: 3753

If a.jsp, b.jsp and c.jsp are a part single process, try putting them on single page (say abc.jsp). Now using some attributes show contents of either a.jsp/b.jsp/c.jsp, something similar to a wizard.

Upvotes: 0

Pokuri
Pokuri

Reputation: 3082

I would suggest few steps to do that...

As you click on back button browser will get the page from cache... so set the JSP page Expires date to some previous day/time to get it from server(origin) instead of cache. This can be done by writing a Custom tag and in that tad set Expires header on HttpServletRequest object and adding that tag to JSP page is enough.

To invalidate the page and redirect to a.jsp when there is no valid session, write a Filter to that job.

Tag can be written like this

public class ExpiryTag extends SimpleTagSupport{

    @Override
    public void doTag() throws JspException, IOException {

        PageContext pageContext = (PageContext) getJspContext(); 
        Calendar instance = Calendar.getInstance();
        instance.add(Calendar.DAY_OF_MONTH, -1);
        HttpServletResponse response = (HttpServletResponse) pageContext.getResponse();
        response.addHeader("Expires", instance.getTime().toString());

    }

}

Map tag in tld file like this

<tag>
            <name>expired</name>
            <tag-class>com.analysis.mvc.tags.ExpiryTag</tag-class>
            <body-content>empty</body-content>
        </tag>

Then use the tag in JSP like this

<prefix:expired/>

For session handling you can go through this for basic understanding.

Upvotes: 1

Related Questions