You could probably lose the timezone stuff too then - just concentrate on the DateFormat
-----Original Message----- From: Aaron Longwell [mailto:[EMAIL PROTECTED] Sent: Tuesday, 3 June 2003 00:21 To: Struts Users Mailing List Subject: Re: Newbie.... Best Practices for ActionForms Thanks for the sample code.... I'll just strip out the Locale business (my app is in an Intranet... only 4 users). Andrew Hill wrote: >Here ya go mate. > >Dont think theres anything struts specific, just a case of applying the >appropriate java date classes, but its a pita to try and grok the little >blighters so Ive given you some example code pasted from one of my classes >you can eyeball instead. > >Chop it about a bit so teacher cant see you've copied ;-> > >Second method wont compile as is (I butchered it after pasting to take out >some app specific oddities) and it doesnt really take much notice of the >locale but shouldnt take you long to get it up to speed. > > >/** > * Convienience method that returns a string representation of what time >the specified Date is > * in the timezone specified using the DateFormat supplied and the >specified locale from which > * language and local 'cultural rules' are extracted for date display. > * If the date is null a new one with current time is instantiated as a >throwaway object > * If the timezone and locale are null will use the defaults. > * If the format is null will create a throwaway DateFormat object with >the format string. > * Any timezone encoded in the format will be restored after the >operation - but will not be used > * even if you pass null for timezone (of course if you pass >tz.getTimezone() thats a different > * matter...) Note that if you supply your own DateFormat, then the locale >you pass as a parameter > * is ignored - so if your passing a SimpleDateFormat you will need to set >it yourself. > * "EEE MMM dd HH:mm:ss zzz yyyy" (which is what Date.toString() uses at >the moment) > * @param date - date to stringify > * @param tz - TimeZone in which date is to be used (for display usually) > * @param locale - Locale for language info > * @param format - a DateFormat object specifiying the output format to >use > * @return string representation of date suitable for display > */ > public static String formatDateInZone( java.util.Date date, > TimeZone tz, > Locale locale, > DateFormat format) > { > TimeZone originalZone = null; > if(date == null) date = new Date(); > if(tz == null) tz = TimeZone.getDefault(); > if(format == null) > { > if(locale == null) locale = Locale.getDefault(); //locale only applies >when we create the df > format = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy",locale); > } > else > { //If they passed in the zone we need to keep track of its original >timeZone so that > //we can restore it when we are done > originalZone = format.getTimeZone(); > } > format.setTimeZone(tz); > String result = format.format(date); > if(originalZone != null) format.setTimeZone(originalZone); > return result; > } > > >public static java.util.Date parseDate( String dateString, > TimeZone tz, > Locale locale, > DateFormat format) > > > if(dateString == null) return null; > TimeZone originalZone = null; > if(tz == null) tz = TimeZone.getDefault(); > if(format == null) > { > if(locale == null) locale = Locale.getDefault(); > format = new SimpleDateFormat(DATE_INPUT_PATTERN, locale); > } > else > > > originalZone = format.getTimeZone(); > } > format.setTimeZone(tz); > java.util.Date result = null; > try > { > result = format.parse(dateString); > return result; > } > catch(ParseException pe) > { > ; //Swallow and return null > } > if(originalZone != null) format.setTimeZone(originalZone); > return result; > } > >-----Original Message----- >From: Aaron Longwell [mailto:[EMAIL PROTECTED] >Sent: Monday, 2 June 2003 23:57 >To: Struts Users Mailing List >Subject: Re: Newbie.... Best Practices for ActionForms > > >Thanks, > >I am planning to use the struts validator.... if I'm hearing you >right... this is the process? > >In ActionForm: >String StartDate; >String End Date; > >In Struts Validator: >validate the strings against a RegEx datetime mask > >In Action: >1) Convert my Event ValueObject (VO)'s date values to strings when >populating the ActionForm. >1) Parse the strings to convert back to date when going from Form to VO.... >Is there a struts technology that will help in this conversion... (from >string to java.util.Date). I always could just use the java.util >classes, but I'm guessing this is a common problem with a common solution. > >Thanks again, >Aaron > >Andrew Hill wrote: > > > >>1.) Yes (I even do this for true/false checkboxes!) >>2.) See #1. >> >>For my dates Im using several fields (d,m,y etc...) and some javascript to >>extract/concatenate into a hidden field in the format yyyy-MM-dd HH:mm:ss , >>but its pretty ugly and I dont like it much (luckily only have one place I >>need to enter dates so far!). If you search around you can also find some >>nice js calendar controls (and there should be some opensource tags for it >>somewhere). >> >>If you want to avoid JS, best bet might be a simple text field where the >>user enters it in a certain format which you validate (storing in AF as >>String). If your using the struts validator I believe it has date support - >>and may even extend to some user friendly client side js support as well, >>though Ive not used it so dont know how far it goes. >> >>-----Original Message----- >>From: Aaron Longwell [mailto:[EMAIL PROTECTED] >>Sent: Monday, 2 June 2003 23:39 >>To: Struts User List >>Subject: Newbie.... Best Practices for ActionForms >> >> >>I am beginning my first Struts project with this setup: >> >>mySQL Database >>Tomcat 4 >>OJB (ObjectRelationalBridge) >> >>My questions: >> >>1) What is the best practice for the properties in an ActionForm bean? >>Because HTTP sends everything from forms as strings, do I make all >>properties Strings, then convert them in the Action (after validating of >>course)? >> >>2) I am using a mySQL DateTime column in the database. What is the best >>practice for editing these values via Struts? Do I put a java.util.Date >>proeprty in the Action form? Or do I use a String (as in Q #1) and then >>do a conversion in the Action? >> >>I am building an event manager... so the StartDate (actually >>StartDateTime) and EndDate (EndDateTime) are central to this >>application. I have not seen any examples of people editing DateTime or >>even Date values in a struts application. >> >>Could someone with experiece in this area give me a brief explanation of >>the recommended workflow for editing dates? >> >>Thanks, >>Aaron Longwell >> >> >>--------------------------------------------------------------------- >>To unsubscribe, e-mail: [EMAIL PROTECTED] >>For additional commands, e-mail: [EMAIL PROTECTED] >> >> >>--------------------------------------------------------------------- >>To unsubscribe, e-mail: [EMAIL PROTECTED] >>For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> >> >> >> >> >> > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > >--------------------------------------------------------------------- >To unsubscribe, e-mail: [EMAIL PROTECTED] >For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
