Creating custom requestParam in springboot controller

Question

i have a use case where the user can send following params with get request

GET localhost/8080/users?filter=alex
OR
GET localhost/8080/users?suffixFilter=lex
OR
GET localhost/8080/users?prefixFilter=a

is it possible to add only one request param instead of 3 in controller

e.g.

instead of

@GetMapping("/users")
@ResponseBody
public String getFoos(@RequestParam String filter, @RequestParam String prefixFilter , @RequestParam String suffixFilter) {
    return "ID: " + id;
}

is it possible to create a dynamic one which includes those three variantes? I was thinking creating class like this

public class FilterCreteria {
    private String filter;
    private String suffixFilter;
    private String prefixFilter;
}

and then passing this to controller

 @GetMapping("/users")
    @ResponseBody
    public String getFoos(@RequestParam FilterCreateria filter) {
        return "ID: " + id;
    }

the problem is if i send filter=alex the other attributes in the class FilterCreteria is null and i want to avoid this null.

What i searching for:

is there other way of making this possible? if my suggestion is ok, how to avoid null attributes when the user only sends one queryparam like filter=alex?

Use the object and instead of `@RequestParam` use `@ModelAttribute`... And read the documentation which explains all this in detail. Else use a `MultiValueMap` as a `@RequestParam` to get all the parameters being send. But I suggest the object route as that makes it easier. — M. Deinum, Jul 01 '22 at 16:27
If i use the object and the user send only prefixfilter then the other attributes will be null. How to get rid od it? — Catalina, Jul 01 '22 at 16:55
You don't. Why is it a problem if those are `null`... Your downstream code should handle that. — M. Deinum, Jul 01 '22 at 16:56
I want to forward the object without any null via resttemplate — Catalina, Jul 01 '22 at 16:59
How to do that, can u apply an example to my posted code plz — Catalina, Jul 01 '22 at 17:14
You can just annotate your object with `@JsonInclude(Include.NON_NULL)` which will leave out all `null` fields in the generated json. — M. Deinum, Jul 01 '22 at 17:22

Creating custom requestParam in springboot controller

0 Answers0