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Java Forum / First Aid / January 2006From HTML Form element String to Integer to Boolean: PHP vs JSP
I can't figure this out, and sorry, I'm a PHP guy. [CODE] try { hasSubmittedMessage = (boolean)Integer.parseInt(request.getParameter("hasSubmittedMessage")); } catch (NumberFormatException nfe) { // NOTHING SUBMITTED = FALSE hasSubmittedMessage = false; } [/CODE] hasSubmittedMessage is a "boolean" HTML form element type with the value of "1". In PHP it's extremely easy to work with because in PHP "1" = 1 = true (though "1" !== 1 !== true), so for me to use "hasSubmittedMessage" in PHP it's this extremely easy: [CODE] foreach ($_POST as $key => $val) if (!isset(${$key})) ${$key} = $val; if ($hasSubmittedMessage) { // DO STUFF } [/CODE] But in JSP, no clue whatsoever to do this, as the above-mentioned code failed in JSP due to "inconvertible types" from String to Integer to Boolean. What do I do? Thanx Phil > I can't figure this out, and sorry, I'm a PHP guy. > [quoted text clipped - 27 lines] > Thanx > Phil Hi, I think you're code will be failing on the cast to boolean. Integer.parseInt() returns an int, and you cannot cast between the two. To find out whether thwy parameter is a one you could try, hasSubmittedMessage = Integer.parseInt(request.getParameter("hasSubmittedMessage")) == 1; The try {} block is probably still a good idea, in case someone sends "asdf" or something. Or, without going through integers, request.getParameter("hasSubmittedMessage").equals("1"); or perhaps slightly better, but a less intuitive to read "1".equals(request.getParameter("hasSubmittedMessage")) Though the String methods may have problems if you start getting wierd things in the parameter. James > > I can't figure this out, and sorry, I'm a PHP guy. > > [quoted text clipped - 40 lines] > The try {} block is probably still a good idea, in case someone sends > "asdf" or something. what's asdf?  SignatureNoodles Jefferson mhm31x9 Smeeter#29 WSD#30 sTaRShInE_mOOnBeAm aT HoTmAil dOt CoM NP: "Informer" -- Snow "Our earth is degenerate in these latter days, bribery and corruption are common, children no longer obey their parents and the end of the world is evidently approaching." --Assyrian clay tablet 2800 B.C. I believe in this example "asdf" is no more than four consecutive keyboard characters. The purpose is to exemplify something that's an invalid input. Opalinski opalpa@gmail.com http://www.geocities.com/opalpaweb/ > I believe in this example "asdf" is no more than four consecutive > keyboard characters. The purpose is to exemplify something that's an [quoted text clipped - 3 lines] > opalpa@gmail.com > http://www.geocities.com/opalpaweb/ Yes, the meaning of "asdf" here is that it has no meaning. > > I believe in this example "asdf" is no more than four consecutive > > keyboard characters. The purpose is to exemplify something that's an [quoted text clipped - 5 lines] > > Yes, the meaning of "asdf" here is that it has no meaning. I see. Thanks to both of you. SignatureNoodles Jefferson mhm31x9 Smeeter#29 WSD#30 sTaRShInE_mOOnBeAm aT HoTmAil dOt CoM NP: "Informer" -- Snow "Our earth is degenerate in these latter days, bribery and corruption are common, children no longer obey their parents and the end of the world is evidently approaching." --Assyrian clay tablet 2800 B.C. In article <1137353104.556939.208740@g49g2000cwa.googlegroups.com>, phillip.s.powell@gmail.com took the hamburger, threw it on the grill, and I said "Oh wow"... > I can't figure this out, and sorry, I'm a PHP guy. > [quoted text clipped - 7 lines] > } > [/CODE] Not tested: try { if (Integer.parseInt(request.getParameter("hasSubmittedMessage")) == 1) { hasMessage = true; } else { hasMessage = false; } } catch(NumberFormatException nfe) { nfe.printStackTrace(); } > hasSubmittedMessage is a "boolean" HTML form element type with the > value of "1". In PHP it's extremely easy to work with because in PHP [quoted text clipped - 15 lines] > Thanx > Phil SignatureNoodles Jefferson mhm31x9 Smeeter#29 WSD#30 sTaRShInE_mOOnBeAm aT HoTmAil dOt CoM NP: "Informer" -- Snow "Our earth is degenerate in these latter days, bribery and corruption are common, children no longer obey their parents and the end of the world is evidently approaching." --Assyrian clay tablet 2800 B.C. Thanx for your help everyone, but I got it! And I should have known all along it was basically no different than what we do in PHP. [CODE] boolean hasSubmittedMessage; try { hasSubmittedMessage = (Integer.parseInt(request.getParameter("hasSubmittedMessage")) != 0); // ENCASE IN PARENTHESES } catch (Exception e) { hasSubmittedMessage = false; } [/CODE] In PHP we determine a boolean by encasing an expression in parentheses! Phil > In article <1137353104.556939.208740@g49g2000cwa.googlegroups.com>, > phillip.s.powell@gmail.com took the hamburger, threw it on the grill, [quoted text clipped - 64 lines] > world is evidently approaching." > --Assyrian clay tablet 2800 B.C. It's not the parantheses. It's that you added a comparison on two integers. You added " != 0" Opalinski opalpa@gmail.com http://www.geocities.com/opalpaweb/ Sorry but it produced a servlet error w/o the parentheses, so it must be the parentheses as far as I can understand. Phil > It's not the parantheses. It's that you added a comparison on two > integers. You added " != 0" > > Opalinski > opalpa@gmail.com > http://www.geocities.com/opalpaweb/ I just tried an example and it worked without parantheses. Opalinski opalpa@gmail.com http://www.geocities.com/opalpaweb/ Like James and Noodles point out, in Java, you need be explicit about the conversion from String to boolean. If you are controlling a hidden html paramter send over "true" and "false" and you can write: hasSubmittedMessage = new Boolean(request.getParameter("hasSubmittedMessage")) if you're in java 5.0 if you're in previous Java versions hasSubmittedMessage = new Boolean(request.getParameter("hasSubmittedMessage")).booleanValue(); if you want a subset of integers to represent true and another subset to represent false you can explicitly convert them in ways like suggested by James and Noodle. Opalinski opalpa@gmail.com http://www.geocities.com/opalpaweb/ Free MagazinesGet these publications absolutely FREE for up to 12 months. 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