Spring MVC Url pattern

Question

I was wondering if I can customize my url into controller to accept null values

@RequestMapping(
            value = "foo/{y}/{x}",
            method = RequestMethod.GET)
    public ModelAndView doSmth(@PathVariable(value = "x") String x,
                               @PathVariable(value = "y") String y) {
}

Here in my case , X , Y can be empty string . How could I manage smth like that to let this method on the controller to handle this url ?

what are all combinations of X and Y? Is it possible to split it to many methods - preprocess variables and do logic in some common private method? — Random
– Random, Commented Jul 12, 2011 at 10:27

skaffman · Accepted Answer · 2011-07-12 10:27:24Z

1

If you want to support optional values, then path variables aren't well suited. Request parameters (using @RequestParam) are a better idea, since they easily support optional values using the required attribute.

If you really want to support optional path variables, then you need to overload your mappings, i.e.

@RequestMapping(value = "foo/{y}/{x}")
public ModelAndView doSmth(@PathVariable(value = "x") String x, @PathVariable(value = "y") String y) 

@RequestMapping(value = "foo/{y}")
public ModelAndView doSmth(@PathVariable(value = "y") String y) 

@RequestMapping(value = "foo")
public ModelAndView doSmth()

answered Jul 12, 2011 at 10:27

skaffman

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6 Comments

Echo Over a year ago

The thing is this url contains mulible fields that may contain empty string not null . If I follow this methodology , I will need to write many overloads methods . I need to avoid this !!

skaffman Over a year ago

@Echo: Yes, that's why I just said use @RequestParam instead.

Echo Over a year ago

I am trying to support it using @RequestMapping /foo/${x}/[#if x?has_content]${y} [#else] What I can do to pass empty String [/#if]

Echo Over a year ago

So is there any advice how to pass empty string !!

skaffman Over a year ago

@Echo: You're not listening to me - path variables are not suited to this kind of logic.

|

Whiteship · Accepted Answer · 2011-07-12 14:04:59Z

1

I don't think, that's a good URL. It can be very confusing to users.

Why don't you try this one?

@RequestMapping("foo/x/{x}/y/{y}")
public ModelAndView doSmth(@PathVariable String x, @PathVariable String y)

answered Jul 12, 2011 at 14:04

Whiteship

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1 Comment

Echo Over a year ago

Thanks. I didn't try it as I have used another methodology but ur solution is interesting to be tried .

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