Optional path variables in Spring-MVC RequestMapping URITemplate

Question

I have the following mapping:

@RequestMapping(value = \"/{first}/**/{last}\", method = RequestMethod.GET)
public String test(@PathVariable(\"first\") String firs         


        

Answer 1

In my project, I use inner variable in the springframework:

@RequestMapping(value = { "/trip/", // /trip/
        "/trip/{tab:doa|poa}/",// /trip/doa/,/trip/poa/
        "/trip/page{page:\\d+}/",// /trip/page1/
        "/trip/{tab:doa|poa}/page{page:\\d+}/",// /trip/doa/page1/,/trip/poa/page1/
        "/trip/{tab:trip|doa|poa}-place-{location}/",// /trip/trip-place-beijing/,/trip/doa-place-shanghai/,/trip/poa-place-newyork/,
        "/trip/{tab:trip|doa|poa}-place-{location}/page{page:\\d+}/"// /trip/trip-place-beijing/page1/
}, method = RequestMethod.GET)
public String tripPark(Model model, HttpServletRequest request) throws Exception {
    int page = 1;
    String location = "";
    String tab = "trip";
    //
    Map pathVariables = (Map) request.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);
    if (pathVariables != null) {
        if (pathVariables.containsKey("page")) {
            page = NumberUtils.toInt("" + pathVariables.get("page"), page);
        }
        if (pathVariables.containsKey("tab")) {
            tab = "" + pathVariables.get("tab");
        }
        if (pathVariables.containsKey("location")) {
            location = "" + pathVariables.get("location");
        }
    }
    page = Math.max(1, Math.min(50, page));
    final int pagesize = "poa".equals(tab) ? 40 : 30;
    return _processTripPark(location, tab, pagesize, page, model, request);
}

See HandlerMapping.html#URI_TEMPLATE_VARIABLES_ATTRIBUTE