How to give default date values in requestparam in spring

Question

@RequestMapping(value = "/getSettlements", method = RequestMethod.GET, headers = "Accept=application/json")
  public @ResponseBody
            Collection<Settlement> getSettlements
            (@RequestParam(value = "startDate") String startDate,
            @RequestParam(value = "endDate") String endDate,
            @RequestParam(value = "merchantIds", defaultValue = "null") String merchantIds)

How to give today's date in defaultValue ? It only takes constant.

Nightstick

Answer 1

@InitBinder
public void initBinder(WebDataBinder binder) throws Exception {
    final DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    final CustomDateEditor dateEditor = new CustomDateEditor(df, true) {
        @Override
        public void setAsText(String text) throws IllegalArgumentException {
            if ("today".equals(text)) {
                setValue(new Date());
            } else {
                super.setAsText(text);
            }
        }
    };
    binder.registerCustomEditor(Date.class, dateEditor);
}

---

@RequestParam(required = false, defaultValue = "today") Date startDate

Renteria

Answer 2

If you are using LocalDate, you can create a default value like this:

@RequestParam(name = "d", defaultValue = "#{T(java.time.LocalDate).now()}", required = true) LocalDate d)

Nakamura

I like the solution with the SpEL. Can you say what the T is doing here? Some kind of casting? – Clericalism

T( type ) creates an instance of the given type. – Nakamura

Answer 3

I tried pretty much every option, even using interceptors. But from far the easiest solution was to use SpEL. For Example: defaultValue = "#{new java.util.Date()}"

Stealing

Answer 4

Since you receive a string you can any date format you want and later on use formatting to extract the date

Melisamelisande

I want something like this @RequestParam(value = "merchantIds", defaultValue = date where date has been set up above as String date = new Date().toString(); but its giving error "attribute value can only be constant" – Nightstick

You can add a private static String to the class and initialize it when the class loads and use it here. – Melisamelisande

thx for info.. I am doing the same .... priavte static String date = new Date().toString(); .... and using this date in my defaultValue but still its saying "attribute value can only be constant" – Nightstick

Try adding final in the parameter declaration – Melisamelisande

same error ..even after doing private static final String date = new Date().toString(); – Nightstick

On that case, try the following work-around: set the param to: required = false and in the code inside the method, check for null value and if so - compute it. See the following example: https://mcmap.net/q/439128/-optional-post-parameter-in-spring-mvc – Melisamelisande

Yes i was doing the same but was trying to use defaultValue field someway. Just i haven't added required=false . Thanks for help. Collection<SettlementItem> getSettlementItems (@RequestParam(value = "startDate",required = false) String startDate, @RequestParam(value = "endDate" ,required = false ) String endDate, { if(startDate==null) { startDate=date; } – Nightstick

Yes - that's exactly it! – Melisamelisande