Map<String, String> as @RequestParam in Spring MVC

Question

I'm new to spring and I'm trying to add a @RequestParam of type Map<String, String> to my controller like this:

@RequestMapping(method = RequestMethod.GET)
public Model search(@RequestParam(value = "searchTerm", required = false) final String searchTerm,
        @RequestParam(value = "filters", required = false) Map<String, String> filters,
        final Model model) {

And in the URL it looks like this:

localhost/search?searchTerm=factory&filters[name]=factory1&filters[name]=factory2

But every time, filters is null, no matter what I do.

Can this be done? Thank you very much for your time!

possible duplicate of Spring MVC + RequestParam as Map + get URL array parameters not working — vzamanillo
– vzamanillo, Commented Apr 7, 2014 at 16:02
Hi vzamanillo, so the only way would be by iterating through all of the request parameters? I cannot declare, lets say, two request parameters that are of type map? — jkap
– jkap, Commented Apr 7, 2014 at 16:10

Maxim Andreev · Accepted Answer · 2017-03-06 13:57:55Z

1

Using Map with @RequestParam for multiple params If the method parameter is Map or MultiValueMap then the map is populated with all query string names and values. Following will be mapped with /employees/234/messages?sendBy=mgr&date=20160210

@RequestMapping("{id}/messages")
public String handleEmployeeMessagesRequest (@PathVariable("id") String employeeId,
                                        @RequestParam Map<String, String> queryMap,
                                        Model model) {
    model.addAttribute("msg", "employee request by id and query map : "+
              employeeId+", "+queryMap.toString());
    return "my-page";
}

Where employeeId = "234" and queryMap = {sendBy=mgr, date=20160210}

answered Mar 6, 2017 at 13:57

Maxim Andreev

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1 Comment

Parker H Gordon Dec 17, 2024 at 15:48

According to the java doc, this is only true if the Map Request Param doesn't have a name. I can't figure out how to get it to work though with a name, despite the javadoc implying that you can

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