The following is an example Spring code on how to create a handler methond within a Spring MultiActionController that includes a Command object. The MultiActionController implementation simple checks whether a method with an additional object in the handler method signature exists. If that's the case it assumes that it is a command object and binds the request parameters to the command object.
A typical Spring MultiActionController does not contain a command object in the method signature.
public ModelAndView myHandler(HttpServletRequest request,
HttpServletResponse response) {
// handler methods here
}
A Spring MultiActionController with a Command object passed as an additional parameter in the method signature.
public ModelAndView myHandler(HttpServletRequest request,
HttpServletResponse response, Object command) {
MyObjectCommand command = (MyObjectCommand) command;
}
The creation of the command object can be overloaded as well.
protected Object newCommandObject(Class clazz)
throws Exception {
return new MyObjectCommand();
}
3 comments:
Hi. Is it possible to have commands of diferent classes depending on the method being invoked?
Yes. You can read more about it in http://static.springsource.org/spring/docs/2.5.x/reference/mvc.html#mvc-controller-multiaction
The object you passed will automatically be bound/populated with the parameters retrieved from the request.
The method signature may look like this:
// 'anyMeaningfulName' can be replaced by any method name
public [ModelAndView | Map | void] anyMeaningfulName(HttpServletRequest, HttpServletResponse [,HttpSession] [,AnyObject])
Hi, I just tried to use you code but I have a problem with Command object mapping. Still getting (neither bindingresult nor plain target object for bean name available as request attribute).
Controller:
public ModelAndView detail(HttpServletRequest request, HttpServletResponse response, Object command) {
ArticleCommentCommand formCommand = (ArticleCommentCommand) command;
String articleCommentCommandName = getCommandName(formCommand);
ModelAndView mav = new ModelAndView("articles/detail");
mav.addObject("articleCommentCommand", articleCommentCommandName);
return mav;
}
JSP:
form:form action="${formUrl}" method="post" commandName="${articleCommentCommand}" cssClass="standardInputForm" name="addArticleComment">
...
/form>
Am I doing something wrong? :-(
Post a Comment