visual basic 2008 barcode generator Hidden Fields Example The Number Guesser in Java

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Hidden Fields Example The Number Guesser
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The number guesser developed in the hidden fields section can be simplified by moving all the hidden fields into an object stored in an HTTP session The object in this example is an inner class named Parameters, which is defined near the top of the JSP page, but it could just as easily be an externally defined class
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<%@ page session="true" %> <H3>Number Guess Guesser</H3> <%!
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4 The API is a little inconsistent here Why use minutes in the deployment descriptor and seconds in the session API
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public static final int WAY_LO = 0; public static final int WAY_HI = 101; public static final String PARMSKEY = "jspcrsessionsnumguessparameters"; // Inner class containing state variables public int int int int } %> <% Parameters parms=(Parameters) sessiongetAttribute(PARMSKEY); if (parms == null) { parms = new Parameters(); parmsstate = 0; sessionsetAttribute(PARMSKEY, parms); } switch (parmsstate) { case 0: { // Initial screen %> <FORM> Think of a number between <%= WAY_LO + 1 %> and <%= WAY_HI - 1 %>, and I'll try to guess it<P> Click OK when ready<P> <INPUT TYPE="submit" VALUE="OK"> </FORM> <% parmslo = WAY_LO; parmshi = WAY_HI; parmsnumGuesses = 0; parmsstate = 1; break; } case 1: { // First guess parmsnumGuesses++; int guess = (parmshi + parmslo)/2; class Parameters { lo; hi; numGuesses; state;
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%> <FORM> My first guess is <%= guess %> How did I do <P> <INPUT TYPE="radio" NAME="result" VALUE="-1" onClick="submit()"> Too low <INPUT TYPE="radio" NAME="result" VALUE="0" onClick="submit()"> Exactly right <INPUT TYPE="radio" NAME="result" VALUE="1" onClick="submit()"> Too high </FORM> <P> <% parmsstate = 2; break; } case 2: { // After first guess parmsnumGuesses++; int result = IntegerparseInt(requestgetParameter("result")); int guess = (parmshi + parmslo)/2; if (result < 0) { parmslo = guess; guess = (parmshi + parmslo)/2; } else if (result > 0) { parmshi = guess; guess = (parmshi + parmslo)/2; } if (result != 0) { %> <FORM> <% if (parmslo > WAY_LO) outprintln(parmslo + " is too low<BR>"); if (parmshi < WAY_HI) outprintln(parmshi + " is too high<BR>"); if ((parmshi - parmslo) > 1) {
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Session and Thread Management
%> My next guess is <%= guess %> How did I do <P> <INPUT TYPE="radio" NAME="result" VALUE="-1" onClick="submit()"> Too low <INPUT TYPE="radio" NAME="result" VALUE="0" onClick="submit()"> Exactly right <INPUT TYPE="radio" NAME="result" VALUE="1" onClick="submit()"> Too high </FORM> <% } else { String[] text = { "Are we cheating ", "Did we forget our number ", "Perhaps we clicked the wrong button ", "What happened ", "What gives ", }; String message = text[(int)(Mathrandom() * textlength)]; sessionremoveAttribute(PARMSKEY); %> <FORM> <%= message %><P> <INPUT TYPE="SUBMIT" VALUE="Start Over"> </FORM> <% } } else { parmsnumGuesses--; %> <FORM> I win, and after only <%= parmsnumGuesses %> guesses!<P> Do you want to try again <P> <INPUT TYPE="SUBMIT" VALUE="Start Over"> </FORM> <% sessionremoveAttribute(PARMSKEY);
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} break; } } %>
The logic remains the same, but where hidden fields were written to the HTML form, their values are now stored in the Parameter object that s bound to the session
URL Rewriting Example The Page Counter
Similarly, the page counter developed in the URL rewriting section can use an HTTP session to store the count variable Because int is a primitive, use the Integer object wrapper and call its intValue() method to get the actual value
<%@ page session="true" %> <HTML> <HEAD> <TITLE>Page Counter Using HTTP Session</TITLE> </HEAD> <BODY> <H3>Page Counter Using HTTP Session</H3> <% if (sessiongetAttribute("count") == null) sessionsetAttribute("count", new Integer(0)); int count=((Integer) sessiongetAttribute("count"))intValue(); switch (count) { case 0: %> This is the first time you have accessed this page <% break; case 1: %> You have accessed the page once before<% break; default: %> You have accessed the page <%= count %> times before<% break; } sessionsetAttribute("count", new Integer(count+1)); %>
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