driven off the Introspector.getBeanInfo public void populateObject(Object object, final Map elements) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException, IntrospectionException, IllegalArgumentException, JSONException, InstantiationException { Class clazz = object.getClass();
BeanInfo info = Introspector.getBeanInfo(clazz); from the object parameter sent as first parameter to populateObject e.g. rootObject = invocation.getAction(); if ((contentType != null) && contentType.equalsIgnoreCase("application/json")) { // load JSON object Object obj = JSONUtil.deserialize(request.getReader()); if (obj instanceof Map) { Map json = (Map) obj; // clean up the values if (dataCleaner != null) dataCleaner.clean("", json); // populate fields populator.populateObject(rootObject, json); if the <target> attribute is available in object acquired by invocation.getAction() then you should see the target does this answer your question? Happy Thanksgiving to one and all Martin ______________________________________________ Verzicht und Vertraulichkeitanmerkung/Note de déni et de confidentialité Diese Nachricht ist vertraulich. Sollten Sie nicht der vorgesehene Empfaenger sein, so bitten wir hoeflich um eine Mitteilung. 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Étant donné que les email peuvent facilement être sujets à la manipulation, nous ne pouvons accepter aucune responsabilité pour le contenu fourni. > Date: Wed, 24 Nov 2010 20:16:45 +0800 > Subject: Re: JSON plugin suggest : parse String value "" to Number with null > / 0 > From: dolt131...@gmail.com > To: user@struts.apache.org > > Thanks,Maurizio, > > This is not a wrong approach. > but can be take a improved for easier use. :P > > Regards. > > > On Tue, Nov 23, 2010 at 12:10 PM, Maurizio Cucchiara > <maurizio.cucchi...@gmail.com> wrote: > > Hi Knight, > > I take your point, JSONPopulator.convertPrimitive function maybe uses a > > wrong approach. > > Does anyone know why convert method process is driven by value and type > > instead of target type only? > > > > 2010/11/23 Knight Chen <dolt131...@gmail.com> > > > >> Hi All, > >> Thanks for reply, and sorry for my poor English. > >> > >> In this case: > >> > >> I have a POJO: > >> public class UserDTO { > >> private int age; > >> ... > >> public void setAge(int age) { > >> this.age = age; > >> } > >> } > >> > >> > >> And Action has a property with this type: > >> > >> public Class UserAction { > >> private UserDTO userInfo; > >> > >> ... > >> public void setUserInfo(UserDTO userInfo { > >> this.userInfo = userInfo; > >> } > >> > >> ... > >> } > >> > >> when I use ajax request and JSON format to transfer this UserDTO obj, > >> this UserDTO is Serialization from html page's text input field, and > >> age input field is empty(user not enter and business logic allow > >> this), > >> then this JSON String will be like this: > >> {'userInfo' : { 'age' : ''}} > >> > >> so, when use JSON plugin to parse this JSON string to UserAction's > >> userInfo property,there will be a Number format exception ( for input > >> String "") > >> > >> I check JSONPopulator.java , it has process null value for int(or > >> other number primitive type) with default value 0, > >> I think if it can parse the "" to int/Integer(or other number type) > >> with 0/null like the same process above mentioned, > >> if do this will easier the front process, because front JS code will > >> not to check the age's type,and transform the empty text input value > >> "" to null. > >> > >> Just a suggeset. > >> > >> Thanks all. > >> > >> Regards, > >> > >> On Tue, Nov 23, 2010 at 9:46 AM, Maurizio Cucchiara > >> <maurizio.cucchi...@gmail.com> wrote: > >> > I'm not sure understand what you mean, it could be ognl conversion > >> related. > >> > For further details, could you provide the NPE stack? > >> > > >> > 2010/11/22 Knight Chen <dolt131...@gmail.com> > >> > > >> >> Hi all, > >> >> > >> >> I often encounter Number format exception when I use JSON plugin to > >> >> parse input String "" from AJAX request to Number, > >> >> because in Web front, that will be a zero length String "" transfer > >> >> to backend if the text input has no enter, > >> >> so will encounter the Number format exception for input String "". > >> >> > >> >> I check the JSONPopulator, that has process the null value to 0 when > >> >> parse to Number type, but not process the String "", > >> >> So can JSONPopulator to support process String "" to null or 0,that > >> >> will be easier web front develop. > >> >> > >> >> > >> >> -- > >> >> ======================== > >> >> Knight Chen > >> >> > >> >> --------------------------------------------------------------------- > >> >> To unsubscribe, e-mail: user-unsubscr...@struts.apache.org > >> >> For additional commands, e-mail: user-h...@struts.apache.org > >> >> > >> >> > >> > > >> > > >> > -- > >> > Maurizio Cucchiara > >> > > >> > >> > >> > >> -- > >> ======================== > >> Knight Chen > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: user-unsubscr...@struts.apache.org > >> For additional commands, e-mail: user-h...@struts.apache.org > >> > >> > > > > > > -- > > Maurizio Cucchiara > > > > > > -- > ======================== > Knight Chen > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@struts.apache.org > For additional commands, e-mail: user-h...@struts.apache.org >